JP2018148504A - Signal processing device and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a deterioration in communication quality.SOLUTION: An antenna to be used for transmission or reception is selected among a plurality of antennas on the basis of reception power of all channels of frequency bands to be used for respective transmission or reception of the plurality of antennas, and the selected antenna is used to transmit or receive a signal. An antenna to be used for transmission or reception is selected among the plurality of antennas on the basis of the attitude of a housing, and the selected antenna is used to transmit or receive a signal. This disclosure is applicable, for example, to a signal processing device, a transmitter, a receiver, a transmitting and receiving device, a communication device, an information processing device, an electronic apparatus, a computer, a program, a storage medium, a system, or the like.SELECTED DRAWING: Figure 4

Description

  The present technology relates to a signal processing apparatus and method, and more particularly, to a signal processing apparatus and method capable of suppressing a reduction in communication quality.

  In general, in order to transmit data with high quality by a transmitter, good antenna characteristics are a condition. Therefore, conventionally, antenna diversity has been performed in which a plurality of antennas are mounted and communication with the receiver side is performed to select an antenna having good antenna characteristics (see, for example, Patent Document 1).

JP 2008-153984 A

  However, since the method described in Patent Document 1 selects a transmission antenna from the received signal processing result, it can be applied only to a device that transmits and receives signals. For this reason, for example, in a transmission device or a reception device that performs one-way communication, such antenna diversity cannot be performed, and communication quality may be reduced.

  This indication is made in view of such a situation, and makes it possible to control reduction of communication quality.

  A signal processing device according to an aspect of the present technology includes a selection unit that selects an antenna to be used for transmission from the plurality of antennas based on reception power of all channels in a frequency band used for transmission of each of the plurality of antennas. A signal processing apparatus comprising: a transmission unit that transmits a signal using the antenna selected by the selection unit.

  The selection unit can select an antenna based on the total received power of each channel in the frequency band.

  The selection unit can select an antenna having the maximum total received power.

  For each antenna, it further includes a reception power calculation unit that measures reception power in each channel of the frequency band and calculates a sum of reception power for all channels, and the selection unit is calculated by the reception power calculation unit The antenna may be configured to select an antenna having a maximum total received power.

  The signal processing method according to an aspect of the present technology selects an antenna to be used for transmission from the plurality of antennas based on reception power of all channels in a frequency band used for transmission by each of the plurality of antennas. This is a signal processing method for transmitting a signal using an antenna.

  A signal processing device according to another aspect of the present technology includes a selection unit that selects an antenna to be used for reception from among the plurality of antennas based on reception power of all channels in a frequency band used for reception of each of the plurality of antennas. And a reception unit that receives a signal using the antenna selected by the selection unit.

  The selection unit can select an antenna based on the total received power of each channel in the frequency band.

  The selection unit can select an antenna having the maximum total received power.

  For each antenna, it further includes a reception power calculation unit that measures reception power in each channel of the frequency band and calculates a sum of reception power for all channels, and the selection unit is calculated by the reception power calculation unit The antenna may be configured to select an antenna having a maximum total received power.

  The signal processing method according to another aspect of the present technology selects an antenna to be used for reception from the plurality of antennas based on reception power of all channels in a frequency band used for reception of each of the plurality of antennas, and selects the antenna. And a signal processing method for receiving a signal using the arranged antenna.

  A signal processing device according to yet another aspect of the present technology includes a selection unit that selects an antenna to be used for transmission from a plurality of antennas based on the attitude of the housing, and a signal that is transmitted using the antenna selected by the selection unit. It is a signal processing apparatus provided with the transmission part which transmits.

  The selection unit can select an antenna arranged on the space side.

  A posture detection unit that detects the posture of the housing is further provided, and the selection unit selects an antenna disposed on the space side based on the posture of the housing detected by the posture detection unit. Can be configured.

  The posture detection unit may be a three-axis electronic compass that detects a direction in which the housing faces.

  A signal processing method according to still another aspect of the present technology is a signal processing method of selecting an antenna to be used for transmission from among a plurality of antennas based on a posture of a casing, and transmitting a signal using the selected antenna. .

  A signal processing device according to still another aspect of the present technology includes a selection unit that selects an antenna to be used for reception from a plurality of antennas based on the attitude of the housing, and a signal that is transmitted using the antenna selected by the selection unit. It is a signal processing apparatus provided with the receiving part which receives.

  The selection unit can select an antenna arranged on the space side.

  A posture detection unit that detects the posture of the housing is further provided, and the selection unit selects an antenna disposed on the space side based on the posture of the housing detected by the posture detection unit. Can be configured.

  The posture detection unit may be a three-axis electronic compass that detects a direction in which the housing faces.

  A signal processing method according to still another aspect of the present technology is a signal processing method of selecting an antenna to be used for reception from among a plurality of antennas based on a posture of a casing and receiving a signal using the selected antenna. .

  In the signal processing apparatus and method according to one aspect of the present technology, an antenna to be used for transmission is selected from among the plurality of antennas based on the reception power of all the channels in the frequency band used for the transmission of each of the plurality of antennas. The signal is transmitted using the selected antenna.

  In the signal processing apparatus and method according to another aspect of the present technology, the antenna to be used for reception is selected from the plurality of antennas based on the reception power of all the channels in the frequency band used for reception of each of the plurality of antennas. The signal is received using the selected antenna.

  In the signal processing device and method according to still another aspect of the present technology, an antenna to be used for transmission is selected from a plurality of antennas based on the attitude of the casing, and a signal is transmitted using the selected antenna. .

  In the signal processing device and method according to still another aspect of the present technology, an antenna to be used for reception is selected from a plurality of antennas based on the attitude of the housing, and a signal is received using the selected antenna. .

  According to the present technology, a signal can be processed. According to the present technology, it is possible to suppress a reduction in communication quality.

It is a figure which shows the main structural examples of a position notification system. It is a schematic diagram for demonstrating the example of the state of an antenna. It is a block diagram which shows the main structural examples of a transmitter. It is a flowchart explaining the example of the flow of a transmission process. It is a block diagram which shows the main structural examples of a highly sensitive receiver. It is a flowchart explaining the example of the flow of a reception process. It is a block diagram which shows the main structural examples of a transmitter. It is a flowchart explaining the example of the flow of a transmission process. It is a block diagram which shows the main structural examples of a highly sensitive receiver. It is a flowchart explaining the example of the flow of a reception process. It is a figure which shows the main structural examples of an antitheft system. And FIG. 20 is a block diagram illustrating a main configuration example of a computer.

Hereinafter, modes for carrying out the present disclosure (hereinafter referred to as embodiments) will be described. The description will be given in the following order.
1. Position notification system First embodiment (transmitting apparatus)
3. Second embodiment (high sensitivity receiver)
4). Third Embodiment (Transmitting Device)
5. Fourth embodiment (high sensitivity receiver)
6). Other

<1. Position notification system>
<Location notification system>
FIG. 1 is a diagram illustrating a main configuration example of a position notification system which is an embodiment of a signal transmission / reception system to which the present technology is applied. A position notification system 100 shown in FIG. 1 is a system in which a transmission apparatus 101 notifies its own position. This system is used, for example, for monitoring and managing a target position. As illustrated in FIG. 1, the position notification system 100 includes devices such as a transmission device 101, a high sensitivity reception device 102, a server 104, and a terminal device 105. The number of the transmission device 101, the high sensitivity receiving device 102, the server 104, and the terminal device 105 is arbitrary, and may be plural.

  The transmission apparatus 101 is an embodiment of the transmission apparatus to which the present technology is applied, and transmits, for example, identification information for identifying itself, position information indicating its own position, and the like as a radio signal. The high-sensitivity receiving apparatus 102 is an embodiment of a receiving apparatus to which the present technology is applied. The high-sensitivity receiving apparatus 102 receives the wireless signal to acquire identification information, position information, and the like of the transmitting apparatus 101 and transmits them via the network 103 To the server 104. That is, the high sensitivity receiving apparatus 102 functions as a relay station that relays the information transmitted from the transmitting apparatus 101 and transmits it to the server 104. The server 104 manages the position of each transmission apparatus 101 by managing the position information associated with the identification information. A terminal device 105 operated by a user who wants to know the position of the transmission apparatus 101 accesses the server 104 via the network 103, supplies identification information of the desired transmission apparatus 101, and requests the position information. The server 104 supplies position information corresponding to the requested identification information to the terminal device 105. The terminal device 105 acquires the position information and notifies the user of the position of the transmission device 101 by displaying the position information together with map data, for example.

  The server 104 can indirectly manage the position of the position monitoring (management) target by carrying (including carrying or wearing) such a transmission apparatus 101 by a target whose position is to be monitored (managed). Can do. In the example of FIG. 1, the user targets the elderly person 111 for position monitoring, and the elderly person 111 carries the transmission device 101. As described above, the position of the transmission device 101 is managed by the server 104 and provided to the terminal device 105. Therefore, the user can grasp the position of the elderly person 111 who is carrying the transmission device 101 by operating the terminal device 105.

  The position monitoring target is arbitrary. For example, it may be a child, an animal such as a dog or a cat, or a company employee. The transmission device 101 may be configured as a dedicated device, but may be incorporated in a portable information processing device such as a mobile phone or a smartphone, for example.

  The position information of the transmitting apparatus 101 may be any information as long as it indicates the position of the transmitting apparatus 101, and may be generated in any manner. For example, the transmitting apparatus 101 may receive a GNSS signal from a GNSS (Global Navigation Satellite System) satellite and obtain its own position information (for example, latitude and longitude) based on the GNSS signal. Further, for example, the transmitting apparatus 101 may specify its own position using a dedicated position specifying system other than GNSS.

  Further, the position information is generated in a device other than the transmission device 101, such as the high-sensitivity reception device 102, the server 104, or a dedicated information processing device (such as a server) provided separately. May be. For example, the GNSS signal received by the transmission apparatus 101 may be supplied to another apparatus, and the other apparatus may obtain the position information of the transmission apparatus 101 from the GNSS signal. In addition, for example, the transmission apparatus 101 supplies information obtained using a dedicated position specifying system other than GNSS to another apparatus, and the other apparatus obtains position information of the transmission apparatus 101 based on the information. May be.

  For example, another device may obtain the position information of the transmission device 101 based on the communication status between the transmission device 101 and the high sensitivity reception device 102. For example, by specifying the high sensitivity receiving device 102 that has received the signal from the transmitting device 101, it may be specified that the transmitting device 101 is located within the communicable range of the high sensitivity receiving device 102. Further, more detailed position information of the transmission apparatus 101 may be obtained based on the signal strength, delay time, and the like of the received signal received by the high sensitivity receiving apparatus 102. Further, for example, the position information of the transmission apparatus 101 may be obtained by trigonometry or the like using the position information of a plurality of high sensitivity reception apparatuses 102 that have received signals from the transmission apparatus 101.

  The installation position of the high sensitivity receiver 102 is arbitrary. For example, the roof or the roof of a building 112 such as a building, apartment, or house may be used. There are many buildings 112 in urban areas where there is a high possibility that a position monitoring target (for example, an elderly person 111) carrying the transmission device 101 is active, and it is preferable because the buildings 112 are easy to install. In particular, when the position monitoring target is a person, the home of the position monitoring target is more preferable because the position monitoring target is more likely to be located around it. Further, in terms of securing the installation location, it is easier to obtain an agreement than when the location notification service provider independently secures the location and installs the high sensitivity receiver 102.

  In addition to this, the high-sensitive receiving device 102 may be installed on a movable object (also referred to as a moving body) such as an automobile, a motorcycle, or a bicycle. That is, the position of the high sensitivity receiving apparatus 102 may be variable.

  The network 103 is an arbitrary communication network, and may be a wired communication network, a wireless communication network, or both. Further, the network 103 may be configured by a single communication network or may be configured by a plurality of communication networks. For example, the Internet, a public telephone line network, a so-called wide area network for wireless mobiles such as 3G lines and 4G lines, WAN (Wide Area Network), LAN (Local Area Network), and communication conforming to Bluetooth (registered trademark) standards Standards such as NFC (Near Field Communication) and other short-range wireless communication channels, infrared communication channels, HDMI (High-Definition Multimedia Interface), USB (Universal Serial Bus), etc. The network 103 may include a communication network or a communication path of an arbitrary communication standard such as a wired communication network complying with the standard.

  The server 104 and the terminal device 105 are information processing devices that process information. The server 104 and the terminal device 105 are communicably connected to the network 103, and can communicate with other communication devices connected to the network 103 via the network 103 to exchange information.

  The server 104 manages the position of the transmission device 101. The server 104 can also manage users who are permitted to provide location information of the transmission apparatus 101. For example, the server 104 can provide the position information of each transmission apparatus 101 only to users who are permitted to acquire the position information of the transmission apparatus 101.

  As described above, the information provided from the transmission apparatus 101 is relayed by the high sensitivity reception apparatus 102 and supplied to the server 104, so that the server 104 manages the position of the transmission apparatus 101. That is, the server 104 can manage the position of the transmission device 101 in a state where the transmission device 101 is located within the communicable range of any of the high sensitivity reception devices 102. In other words, if the position of the transmission apparatus 101 is out of the communicable range of any of the high sensitivity receiving apparatuses 102, the server 104 cannot manage the position. Therefore, the server 104 can manage the position of the transmission apparatus 101 more accurately as the communication range network of the high sensitivity reception apparatus 102 with the transmission apparatus 101 becomes wider.

  Here, more accurate management means that the position of the transmission apparatus 101 is managed in a wider range (that is, the area in which the position of the transmission apparatus 101 cannot be managed is reduced). In order to make the range in which the position of the transmission apparatus 101 can be managed wider, the transmission apparatus 101 and the high-sensitivity reception apparatus 102 can transmit and receive radio signals farther (for each high-sensitivity reception apparatus 102). A wider communication range is preferable. The method of transmitting and receiving the radio signal between the transmitting apparatus 101 and the high sensitivity receiving apparatus 102 is arbitrary, and may conform to any communication standard. For example, a frequency band including 925 MHz (both 920 MHz band) May be used in a method that enables long-distance communication.

  For example, if the time and frequency at which the transmission apparatus 101 transmits a radio signal are known (the high sensitivity reception apparatus 102 knows), the high sensitivity reception apparatus 102 detects the radio signal at the known time and frequency. Detection is easier because it only has to be done. Therefore, reception sensitivity can be improved. That is, the communicable range of the high sensitivity receiving apparatus 102 can be further expanded.

<Antenna diversity>
Moreover, the transmission sensitivity on the receiving side can be improved by transmitting data with higher quality on the transmitting side. In general, in order to transmit data with high quality on the transmission side, the antenna characteristics are good. For example, when the transmission apparatus 101 is carried by an elderly person 111 as in the example of FIG. 1, the transmission apparatus 101 transmits a signal in the vicinity of the human body (the elderly person 111) as in the model shown in FIG. 2A. there's a possibility that. FIG. 2B shows a plan view of the radiation characteristics of the antenna of the transmitting apparatus 101 in that case, and FIG. As shown in FIG. 2B and FIG. 2C, in this case, the radio wave is not substantially radiated to the human body (elderly person 111) side. That is, when the antenna is located in the vicinity of the human body, the operating gain of radio waves is reduced.

  Therefore, for example, as described in Patent Document 1, antenna diversity has been performed in which a plurality of antennas having different antenna characteristics, positions, postures, and the like are mounted and the antenna having the best performance is selected. There are various criteria for judging that the best performance is simply the signal level, the CNR (Carrier to Noise Ratio), and whether or not reception is possible.

  However, in the case of the position notification system 100, since the one-way communication from the transmission device 101 to the high-sensitivity reception device 102, information such as the signal level, CNR, and reception availability is transmitted from the high-sensitivity reception device 102 to the transmission device 101. Cannot send. Therefore, the transmission apparatus 101 cannot select a transmission antenna based on the reception information. For this reason, such antenna diversity cannot be performed, and communication quality may be reduced.

<2. First Embodiment>
<Transmitter antenna diversity by carrier sense>
Therefore, based on the received power of all the channels in the frequency band used for transmission of each of the plurality of antennas, the antenna to be used for transmission is selected from the plurality of antennas, and a signal is transmitted using the selected antenna. You may do it. A high level of surrounding radio waves indicates that the impedance of the antenna is matched and that the output level is strong even during transmission. That is, by selecting a more preferable antenna based on the reception power in this way, the transmission apparatus 101 can transmit data with higher quality without receiving a signal transmitted from the communication partner. Therefore, it is possible to suppress a reduction in communication quality.

<Configuration of transmitter>
FIG. 3 is a block diagram illustrating a main configuration example of the transmission apparatus 101. As illustrated in FIG. 3, the transmission apparatus 101 includes a control unit 151, an antenna 161-1, an antenna 161-2, an antenna selection unit 162, a processing selection unit 163, a carrier sense unit 164, and a transmission unit 165.

  The control unit 151 controls each processing unit of the transmission apparatus 101 and performs processing related to control such as processing related to signal transmission, processing related to carrier sense, processing related to antenna diversity, and the like. The antenna 161-1 and the antenna 161-2 are a plurality of antennas provided in the transmission apparatus 101. The antenna 161-1 and the antenna 161-2 are referred to as the antenna 161 when it is not necessary to distinguish them from each other. Although two antennas 161 are shown in FIG. 3, the number of antennas 161 is arbitrary. The antenna 161 is used for signal transmission and carrier sense, for example.

  The antenna selection unit 162 performs processing related to selection of the antenna 161 used for signal transmission and carrier sense. For example, the antenna selection unit 162 is controlled by the control unit 151 to select one of the antenna 161-1 and the antenna 161-2. Then, the antenna selection unit 162 supplies the transmission signal supplied from the processing selection unit 163 to the selected antenna 161. That is, the transmission signal is transmitted via the antenna 161 selected by the antenna selection unit 162. Further, for example, at the time of carrier sense, the antenna selection unit 162 supplies a signal received via the selected antenna 161 to the processing selection unit 163. That is, at the time of carrier sense, the received power received via the antenna selected by the antenna selection unit 162 is supplied to the processing selection unit 163.

  The process selection unit 163 performs a process related to selection of a process to be executed. For example, the process selection unit 163 is controlled by the control unit 151 to select one of the carrier sense unit 164 and the transmission unit 165. For example, when transmitting a signal, the process selection unit 163 selects the transmission unit 165. Then, the process selection unit 163 supplies the signal supplied from the transmission unit 165 to the antenna selection unit 162. For example, when performing carrier sense, the process selection unit 163 selects the carrier sense unit 164. Then, the process selection unit 163 supplies the reception power supplied from the antenna selection unit 162 to the carrier sense unit 164. That is, the processing unit selected by the processing selection unit 163 is connected to the antenna 161 selected by the antenna selection unit 162.

  The carrier sense unit 164 performs processing related to carrier sense. For example, the carrier sense unit 164 is controlled by the control unit 151 to measure the reception power in each channel of the frequency band used for signal transmission. The transmission unit 165 performs processing related to signal transmission. For example, the transmission unit 165 is controlled by the control unit 151 to generate a signal to be transmitted (transmission signal), and the antenna is selected by the processing selection unit 163, the antenna selection unit 162, and the antenna selection unit 162. 161 is transmitted as a radio signal.

  In such a transmission apparatus 101, the control unit 151 controls the carrier sense unit 164 and the like, performs carrier scanning on the frequency band used for signal transmission, and measures the received power of each channel. The control unit 151 causes such a carrier scan to be performed for each antenna 161. And the control part 151 controls the antenna selection part 162 based on the measurement result (reception power of each channel) of each antenna, and makes the antenna 161 select. That is, the antenna selection unit 162 selects an antenna to be used for signal transmission based on the received power in the frequency band used for signal transmission. Then, the control unit 151 controls the processing selection unit 163 to select the transmission unit 165, and controls the transmission unit 165 to generate a transmission signal, which is transmitted via the antenna 161 selected by the antenna selection unit 162. To send. That is, the transmission unit 165 transmits a signal via the antenna 161 selected by the antenna selection unit 162.

  In this way, signal transmission can be performed using the antenna selected according to the received power, so that the transmission apparatus 101 can perform performance without receiving a signal transmitted from the communication partner. Signal transmission can be performed using a better antenna. Therefore, even the transmission apparatus 101 that does not have a signal reception function can transmit data with higher quality, and can suppress a reduction in communication quality.

  The control unit 151 controls the antenna selection unit 162 to select the antenna 161 based on the integrated value (total received power for all channels) of the measurement results (reception power of each channel) of each antenna. May be. That is, the antenna selection unit 162 may select an antenna based on the total sum of received power of each channel in a frequency band used for signal transmission. By doing so, the antenna 161 with better characteristics can be selected, so that the transmission apparatus 101 can transmit data with higher quality and suppress reduction in communication quality.

  The control unit 151 may calculate the integrated value (the sum of received power for all channels). By calculating the integrated value in the control unit 151 that controls each processing unit of the transmission apparatus 101, the integrated value can be calculated more easily, and the calculated integrated value can be used.

  Further, for example, the control unit 151 may control the antenna selection unit 162 to select the antenna 161 having the maximum total received power. That is, the antenna selection unit 162 may select the antenna 161 having the maximum total received power. By doing so, the antenna 161 having the best characteristics can be selected, so that the transmission apparatus 101 can transmit data with higher quality and suppress reduction in communication quality.

<Flow of transmission processing>
An example of the flow of transmission processing executed by the transmission apparatus 101 will be described with reference to the flowchart of FIG. When the transmission process is started, the process selection unit 163 is controlled by the control unit 151 in step S101 to switch the connection to the antenna 161 to the carrier sense side. That is, the process selection unit 163 connects the carrier sense unit 164 to the antenna selection unit 162.

  In step S102, the antenna selection unit 162 is controlled by the control unit 151 to select the antenna 161 to be used. That is, the antenna selection unit 162 connects the antenna 161-1 or the antenna 161-2 to the processing selection unit 163. As a result, the carrier sense unit 164 is connected to the antenna 161-1 or the antenna 161-2.

  In step S103, the carrier sense unit 164 is controlled by the control unit 151 to select a channel to be processed from a plurality of channels in a frequency band used for signal transmission. In step S104, the carrier sense unit 164 is controlled by the control unit 151 to measure the reception power of the processing target channel. The control unit 151 acquires and integrates the received power measured by the carrier sense unit 164. That is, the control unit 151 integrates the received power of each channel.

  In step S105, the control unit 151 determines whether or not processing has been performed for all channels. If it is determined that there is an unprocessed channel, the process returns to step S103. That is, each process of step S103 to step S105 is executed for each channel. If it is determined in step S105 that the received power is measured and integrated for all channels in the frequency band used for signal transmission, the process proceeds to step S106.

  In step S106, the control unit 151 determines whether all antennas 161 have been processed. If it is determined that there is an unprocessed antenna 161, the process returns to step S102. In step S102, an unprocessed antenna is selected, and the processing in steps S103 to S105 is executed for the antenna. That is, each process of step S102 to step S106 is executed for each antenna. If it is determined in step S106 that the process has been performed for all antennas, the process proceeds to step S107.

  In step S <b> 107, the antenna selection unit 162 is controlled by the control unit 151 to select the antenna 161 having the maximum total received power calculated by the control unit 151. That is, the antenna selection unit 162 connects the antenna 161-1 and the antenna 161-2 having the larger received power to the processing selection unit 163.

  In step S108, the process selection unit 163 is controlled by the control unit 151 to switch the connection to the antenna 161 to the transmission side. That is, the process selection unit 163 connects the transmission unit 165 to the antenna selection unit 162. Thereby, transmitting section 165 is connected to antenna 161-1 and antenna 161-2 having the higher received power.

  In step S109, the transmission unit 165 performs transmission under the control of the control unit 151. That is, the transmission unit 165 generates a transmission signal and transmits the transmission signal via the antenna 161 selected by the antenna selection unit 162. When the signal transmission ends, the transmission process ends.

  By executing each process as described above, the transmission apparatus 101 can perform signal transmission using an antenna with higher received power. The large received power indicates that the antenna impedance is matched by 50Ω and that the antenna performance is good. That is, the transmission apparatus 101 can select an antenna with better performance without receiving a signal transmitted from a communication partner. Therefore, for example, even in a situation where the position of the antenna is in the vicinity of the human body or the antenna itself is out of order, the transmission apparatus 101 performs data transmission with higher quality by switching a plurality of antennas. be able to. As described above, by applying the present technology, even the transmission apparatus 101 having no signal reception function can perform data transmission so as to improve the data reception success rate on the reception side. That is, a reduction in communication quality can be suppressed.

  The received power used for antenna selection may not be for all channels in the frequency band used for signal transmission. For example, antenna selection may be performed based on (the integrated value of) received power of some channels.

  Further, the antenna selection may be performed based on the received power, and a parameter relating to the received power compared between the antennas is arbitrary. For example, the received power of each channel may be multiplied by a weighting factor, and the integrated value of the received power multiplied by the weighting factor may be compared. For example, instead of the integrated value of received power, the maximum value, average value, median value, etc. of received power may be compared. Note that an antenna with a non-maximum parameter value to be compared may be selected.

<3. Second Embodiment>
<Receiver antenna diversity by carrier sense>
Note that the present technology may be applied on the reception side. That is, based on the received power of all the channels in the frequency band used for reception of each of the plurality of antennas, the antenna to be used for reception is selected from the plurality of antennas, and signals are received using the selected antennas. You may do it. A strong level of surrounding radio waves indicates that the impedance of the antenna is matched and that the output level is strong even during reception. That is, by selecting a more preferable antenna based on the received power in this way, the high sensitivity receiving apparatus 102 can perform data reception with higher sensitivity, and thus it is possible to suppress a reduction in communication quality. In this case, the high-sensitivity receiving apparatus 102 can select an antenna without receiving a signal transmitted from the communication partner (transmitting apparatus 101), and thus does not wait for a signal from the communication partner (that is, The antenna can be selected (faster). That is, the reduction in communication quality can be suppressed at higher speed.

<Configuration of receiving device>
FIG. 5 is a block diagram illustrating a main configuration example of the high sensitivity receiving apparatus 102. As illustrated in FIG. 5, the high sensitivity receiving apparatus 102 includes a control unit 201, an antenna 211-1, an antenna 211-2, an antenna selection unit 212, a processing selection unit 213, a carrier sense unit 214, and a reception unit 215. .

  The control unit 201 controls each processing unit of the high sensitivity receiving apparatus 102 and performs processing related to control such as processing related to signal reception, processing related to carrier sense, processing related to antenna diversity, and the like. The antenna 211-1 and the antenna 211-2 are a plurality of antennas provided in the high sensitivity receiving apparatus 102. The antenna 211-1 and the antenna 211-2 are referred to as the antenna 211 when it is not necessary to distinguish between them. Although two antennas 211 are shown in FIG. 5, the number of antennas 211 is arbitrary. The antenna 211 is used for signal reception and carrier sense, for example.

  The antenna selection unit 212 performs processing related to selection of the antenna 211 used for signal reception and carrier sense. For example, the antenna selection unit 212 is controlled by the control unit 201 to select either the antenna 211-1 or the antenna 211-2. Then, the antenna selection unit 212 supplies the reception signal received via the selected antenna 211 to the processing selection unit 213.

  The process selection unit 213 performs a process related to selection of a process to be executed. For example, the process selection unit 213 is controlled by the control unit 201 to select one of the carrier sense unit 214 and the reception unit 215. For example, when receiving a signal, the process selection unit 213 selects the reception unit 215. Then, the process selection unit 213 supplies the reception signal supplied from the antenna selection unit 212 to the reception unit 215. For example, when performing carrier sense, the process selection unit 213 selects the carrier sense unit 214. Then, the process selection unit 213 supplies the reception power supplied from the antenna selection unit 212 to the carrier sense unit 214. That is, the processing unit selected by the processing selection unit 213 is connected to the antenna 211 selected by the antenna selection unit 212.

  The carrier sense unit 214 performs processing related to carrier sense. For example, the carrier sense unit 214 is controlled by the control unit 201 and measures received power in each channel of a frequency band used for signal reception. The receiving unit 215 performs processing related to signal reception. For example, the reception unit 215 is controlled by the control unit 201 and received via the antenna 211 selected by the antenna selection unit 212, and the reception signal supplied via the antenna selection unit 212 and the processing selection unit 213 is received. Then, predetermined processing such as demodulation is performed, and data (for example, identification information and position information) transmitted from the transmission apparatus 101 is acquired.

  In such a high-sensitivity receiving apparatus 102, the control unit 201 controls the carrier sense unit 214 and the like, performs carrier scanning on the frequency band used for signal reception, and measures the reception power of each channel. The control unit 201 performs such a carrier scan for each antenna 211. And the control part 201 controls the antenna selection part 212 based on the measurement result (reception power of each channel) of each antenna, and makes the antenna 211 select. That is, the antenna selection unit 212 selects an antenna to be used for signal reception based on the received power in the frequency band used for signal reception. Then, the control unit 201 controls the processing selection unit 213 to select the reception unit 215 and controls the reception unit 215 to execute processing such as demodulation on the reception signal received via the antenna 211. That is, the reception unit 215 receives a signal via the antenna 211 selected by the antenna selection unit 212.

  In this way, signal reception can be performed using the antenna selected according to the reception power, and thus the high sensitivity receiving apparatus 102 can perform signal reception using an antenna with better performance. it can. Therefore, the high sensitivity receiving apparatus 102 can perform data reception with higher sensitivity, and can suppress a reduction in communication quality. Note that the high-sensitivity receiving apparatus 102 can select an antenna without receiving a signal transmitted from the communication partner (transmitting apparatus 101), and therefore does not wait for a signal from the communication partner (that is, at a higher speed). ) The antenna can be selected. That is, the reduction in communication quality can be suppressed at higher speed.

  The control unit 201 controls the antenna selection unit 212 to select the antenna 211 based on the integrated value of the measurement results of each antenna (reception power of each channel) (the sum of the reception power for all channels). May be. That is, the antenna selection unit 212 may select an antenna based on the total received power of each channel in the frequency band used for signal reception. In this way, since the antenna 211 with better characteristics can be selected, the high sensitivity receiving apparatus 102 can perform data reception with higher sensitivity and suppress reduction in communication quality. .

  Note that the control unit 201 may calculate the integrated value (the sum of received power for all channels). By calculating the integrated value in the control unit 201 that controls each processing unit of the high sensitivity receiving apparatus 102, the integrated value can be calculated more easily and the calculated integrated value can be used.

  Further, for example, the control unit 201 may control the antenna selection unit 212 to select the antenna 211 having the maximum total received power. That is, the antenna selection unit 212 may select the antenna 211 having the maximum total received power. In this way, since the antenna 211 having the best characteristics can be selected, the high sensitivity receiving apparatus 102 can perform data reception with higher sensitivity and can suppress a reduction in communication quality. .

<Flow of reception processing>
With reference to the flowchart of FIG. 6, an example of the flow of reception processing executed by the high sensitivity receiving apparatus 102 will be described. When the reception process is started, the process selection unit 213 is controlled by the control unit 201 in step S131 to switch the connection to the antenna 211 to the carrier sense side. That is, the process selection unit 213 connects the carrier sense unit 214 to the antenna selection unit 212.

  In step S132, the antenna selection unit 212 is controlled by the control unit 201 to select the antenna 211 to be used. That is, the antenna selection unit 212 connects the antenna 211-1 or the antenna 211-2 to the process selection unit 213. As a result, the carrier sense unit 214 is connected to the antenna 211-1 or the antenna 211-2.

  In step S133, the carrier sense unit 214 is controlled by the control unit 201 to select a channel to be processed from a plurality of channels in a frequency band used for signal reception. In step S134, the carrier sense unit 214 is controlled by the control unit 201 to measure the reception power of the processing target channel. The control unit 201 acquires and integrates the received power measured by the carrier sense unit 214. That is, the control unit 201 integrates the received power of each channel.

  In step S135, the control unit 201 determines whether or not all channels have been processed. If it is determined that there is an unprocessed channel, the process returns to step S133. That is, each process of step S133 to step S135 is executed for each channel. If it is determined in step S135 that the received power is measured and integrated for all channels in the frequency band used for signal reception, the process proceeds to step S136.

  In step S136, the control unit 201 determines whether all antennas 211 have been processed. If it is determined that there is an unprocessed antenna 211, the process returns to step S132. In step S132, an unprocessed antenna is selected, and the processing in steps S133 to S135 is executed for the antenna. That is, each process of step S132 to step S136 is executed for each antenna. If it is determined in step S136 that the process has been performed for all antennas, the process proceeds to step S137.

  In step S <b> 137, the antenna selection unit 212 is controlled by the control unit 201 and selects the antenna 211 having the maximum total received power calculated by the control unit 201. That is, the antenna selection unit 212 connects the antenna 211-1 and the antenna 211-2 having the larger received power to the process selection unit 213.

  In step S138, the process selection unit 213 is controlled by the control unit 201 to switch the connection to the antenna 211 to the reception side. That is, the process selection unit 213 connects the reception unit 215 to the antenna selection unit 212. As a result, the receiving unit 215 is connected to the antenna 211-1 and the antenna 211-2 having the larger reception power.

  In step S139, the reception unit 215 performs reception under the control of the control unit 201. That is, the reception unit 215 receives a signal via the antenna 211 selected by the antenna selection unit 212, acquires the reception signal via the antenna selection unit 212 and the processing selection unit 213, and converts the received signal into the acquired reception signal. On the other hand, predetermined processing such as demodulation is performed, and data supplied from the transmission apparatus 101 is acquired. When the signal reception ends, the reception process ends.

  By executing each process as described above, the high sensitivity receiving apparatus 102 can receive a signal using an antenna having a larger reception power. The large received power indicates that the antenna impedance is matched by 50Ω and that the antenna performance is good. That is, the high sensitivity receiving apparatus 102 can select an antenna with better performance. Therefore, for example, even in a situation where the position of the antenna is in the vicinity of the human body or the antenna itself is out of order, the high-sensitivity receiving device 102 switches the plurality of antennas to make data reception more sensitive. Can be done. That is, the high sensitivity receiving apparatus 102 can improve the data reception success rate, and can suppress a reduction in communication quality.

  Note that the high-sensitivity receiving apparatus 102 can select an antenna without receiving a signal transmitted from the communication partner (transmitting apparatus 101), and therefore does not wait for a signal from the communication partner (that is, at a higher speed). ) The antenna can be selected. That is, the reduction in communication quality can be suppressed at higher speed.

  The reception power used for antenna selection may not be for all channels in the frequency band used for signal reception. For example, antenna selection may be performed based on (the integrated value of) received power of some channels.

  Further, the antenna selection may be performed based on the received power, and a parameter relating to the received power compared between the antennas is arbitrary. For example, the received power of each channel may be multiplied by a weighting factor, and the integrated value of the received power multiplied by the weighting factor may be compared. For example, instead of the integrated value of received power, the maximum value, average value, median value, etc. of received power may be compared. Note that an antenna with a non-maximum parameter value to be compared may be selected.

<4. Third Embodiment>
<Receiver-side antenna diversity depending on chassis orientation>
In the above description, the antenna selection is performed based on the received power measured by carrier sense. However, any information can be used as long as the information is obtained without receiving a signal transmitted from the communication partner. Antenna selection may be performed. For example, for the transmission apparatus 101, an antenna to be used for transmission may be selected from among a plurality of antennas based on the attitude of the casing of the transmission apparatus 101, and a signal may be transmitted using the selected antenna.

  For example, as described with reference to FIG. 2, when the transmission apparatus 101 is used in the vicinity of a human body (for example, an elderly person 111), an antenna closer to the human body has a larger reduction in operation gain. Therefore, by selecting an antenna farther from the human body (an antenna on the more space side), it is possible to suppress a reduction in communication quality. For example, the same applies to the case where the transmission apparatus 101 is installed on the ground or the like, and the ground-side antenna has a greater reduction in operating gain. Therefore, it is possible to suppress a reduction in communication quality by selecting an antenna farther from the ground (an antenna on the space side).

  In this way, the radio wave radiation pattern is often determined by the attitude of the casing of the transmission apparatus 101 (relationship with surrounding objects). In general, the position of each antenna in the transmission apparatus 101 is fixed and known. Therefore, an antenna with better performance can be selected by selecting an antenna to be used for signal transmission based on the attitude of the casing of the transmission apparatus 101 (relationship with surrounding objects). Therefore, even the transmission apparatus 101 that does not have a signal reception function can transmit data with higher quality, and can suppress a reduction in communication quality.

<Configuration of transmitter>
FIG. 7 is a block diagram illustrating a main configuration example of the transmission apparatus 101 in that case. In the case of the example illustrated in FIG. 7, the transmission apparatus 101 includes a three-axis electronic compass 251 in addition to the configuration in the case of FIG. 3.

  The three-axis electronic compass 251 measures the orientation of the casing of the transmission device 101 in space. That is, the three-axis electronic compass 251 functions as an attitude detection unit that detects the attitude of the casing of the transmission device 101 in space. The three-axis electronic compass 251 supplies information indicating the measured attitude (orientation) of the casing of the transmission apparatus 101 to the control unit 151.

  The control unit 151 controls the antenna selection unit 162 to select the antenna 161 based on the information supplied from the three-axis electronic compass 251, that is, the attitude of the casing of the transmission device 101. That is, the antenna selection unit 162 selects an antenna to be used for signal transmission based on the attitude of the casing of the transmission apparatus 101. Then, the control unit 151 controls the processing selection unit 163 to select the transmission unit 165, controls the transmission unit 165 to generate a transmission signal, and transmits the transmission signal via the antenna 161 selected by the antenna selection unit 162. To send. That is, the transmission unit 165 transmits a signal via the antenna 161 selected by the antenna selection unit 162.

  By doing so, signal transmission can be performed using the antenna selected according to the attitude of the casing of the transmission apparatus 101, and therefore the transmission apparatus 101 receives a signal transmitted from the communication partner. Without limitation, signal transmission can be performed using an antenna having better performance. Therefore, even the transmission apparatus 101 that does not have a signal reception function can transmit data with higher quality, and can suppress a reduction in communication quality.

  Note that the antenna selection unit 162 may select an antenna arranged on the space side based on the attitude of the casing of the transmission apparatus 101. Here, “space” indicates a state in which no other object exists. In general, antenna characteristics are improved when no other object is present in the surrounding area. Accordingly, the transmission apparatus 101 can perform signal transmission using an antenna with better performance.

  For example, if the situation around the transmission apparatus 101 (such as the presence of a nearby object) is known, the antenna may be selected based on the attitude of the casing of the transmission apparatus 101 with respect to the situation. For example, when it is clear that the human body (elderly person 111) is positioned in a predetermined direction when viewed from the transmission device 101 in the state where the elderly person 111 is carrying the transmission device 101, the attitude of the casing of the transmission device 101 By selecting an antenna in the direction opposite to that of the human body based on the above, it is possible to select the antenna arranged on the space side.

  For example, when the situation around the transmission apparatus 101 is unknown, an antenna on the upper side (empty side, opposite to the ground) of the casing of the transmission apparatus 101 may be selected. In general, since the ground exists below the casing of the transmission apparatus 101, the space is narrower than the upper side, and the radiation efficiency of radio waves is often reduced. Therefore, by selecting the antenna on the upper side of the casing of the transmission apparatus 101 based on the attitude of the casing of the transmission apparatus 101, the possibility of selecting an antenna with better performance increases. Reduction can be suppressed.

  Note that the posture detection unit may be detected by an acceleration sensor, for example. Other than a 3-axis electronic compass may be used. Moreover, you may make it detect with another apparatus. For example, the transmission apparatus 101 may be imaged by the imaging apparatus, and the attitude of the casing of the transmission apparatus 101 may be detected based on the captured image. Further, the attitude of the casing of the transmission apparatus 101 may be detected by a plurality of methods. That is, the method for detecting the attitude of the casing of the transmission apparatus 101 is arbitrary.

<Flow of transmission processing>
An example of the flow of transmission processing executed by the transmission apparatus 101 will be described with reference to the flowchart of FIG. When the transmission process is started, the three-axis electronic compass 251 is controlled by the control unit 151 and detects the attitude of the casing of the transmission apparatus 101 in step S161. The control unit 151 acquires the information and grasps the attitude of the casing of the transmission device 101.

  In step S162, the antenna selection unit 162 is controlled by the control unit 151, and the performance of the antenna 161-1 and the antenna 161-2 is determined according to the attitude of the casing of the transmission device 101 detected in step S161. Choose the better one.

  In step S163, the process selection unit 163 is controlled by the control unit 151 to switch the connection to the antenna 161 to the carrier sense side. That is, the process selection unit 163 connects the carrier sense unit 164 to the antenna selection unit 162.

  In step S164, the carrier sense unit 164 is controlled by the control unit 151, performs carrier sense, and confirms whether or not a frequency band used for signal transmission is free.

  If it is confirmed that the frequency band is vacant, in step S165, the process selection unit 163 is controlled by the control unit 151 to switch the connection to the antenna 161 to the transmission side. That is, the process selection unit 163 connects the transmission unit 165 to the antenna selection unit 162. Thereby, the transmission part 165 and the direction selected in step S162 of the antenna 161-1 and the antenna 161-2 are connected.

  In step S166, the transmission unit 165 performs transmission under the control of the control unit 151. That is, the transmission unit 165 generates a transmission signal and transmits the transmission signal via the antenna 161 selected by the antenna selection unit 162. When the signal transmission ends, the transmission process ends.

  By executing each process as described above, the transmission apparatus 101 can perform signal transmission using an antenna according to the attitude of the casing of the transmission apparatus 101. That is, the transmission apparatus 101 can select an antenna with better performance without receiving a signal transmitted from a communication partner. Therefore, for example, even in a situation where the position of the antenna is located in the vicinity of the human body, the transmission apparatus 101 can perform data transmission with higher quality by switching a plurality of antennas. As described above, by applying the present technology, even the transmission apparatus 101 having no signal reception function can perform data transmission so as to improve the data reception success rate on the reception side. That is, a reduction in communication quality can be suppressed.

  Note that the timing of posture detection and antenna selection is arbitrary. As described above, it may be performed before carrier sensing, may be performed constantly in parallel with carrier sensing or signal transmission, or may be performed at a predetermined time. Further, it may be periodically repeated at a predetermined time interval, or may be repeatedly performed irregularly.

<5. Fourth Embodiment>
<Receiver-side antenna diversity depending on chassis orientation>
Note that the present technology may be applied on the reception side. That is, an antenna to be used for reception may be selected from a plurality of antennas based on the attitude of the housing, and a signal may be received using the selected antenna. For example, for the high sensitivity receiver 102, an antenna to be used for reception is selected from a plurality of antennas based on the attitude of the casing of the high sensitivity receiver 102, and a signal is received using the selected antenna. May be.

  For example, as described with reference to FIG. 2, when the high-sensitivity receiving apparatus 102 is used in the vicinity of some object (for example, a building 112), the antenna closer to the object has a larger reduction in operating gain. . Therefore, by selecting an antenna farther from the object (an antenna on the more space side), it is possible to suppress a reduction in communication quality. For example, the same applies to the case where the high-sensitivity receiving apparatus 102 is installed on the ground or the like, and the ground-side antenna has a greater reduction in operating gain. Therefore, it is possible to suppress a reduction in communication quality by selecting an antenna farther from the ground (an antenna on the space side).

  As described above, the radio wave radiation pattern is often determined by the attitude of the casing of the high-sensitivity receiving apparatus 102 (relationship with surrounding objects). In general, the position of each antenna in the high sensitivity receiver 102 is fixed and known. Therefore, the high sensitivity receiving apparatus 102 performs data reception with higher sensitivity by selecting an antenna to be used for signal reception based on the attitude of the casing of the high sensitivity receiving apparatus 102 (relationship with surrounding objects). Therefore, reduction in communication quality can be suppressed. In this case, the high-sensitivity receiving apparatus 102 can select an antenna without receiving a signal transmitted from the communication partner (transmitting apparatus 101), and thus does not wait for a signal from the communication partner (that is, The antenna can be selected (faster). That is, the reduction in communication quality can be suppressed at higher speed.

<Configuration of receiving device>
FIG. 9 is a block diagram illustrating a main configuration example of the high sensitivity receiving apparatus 102 in that case. In the case of the example shown in FIG. 9, the high sensitivity receiving apparatus 102 includes a three-axis electronic compass 281 in addition to the configuration in the case of FIG. 5.

  The triaxial electronic compass 281 is a processing unit similar to the triaxial electronic compass 251 and measures the orientation of the casing of the high sensitivity receiving apparatus 102 in space. That is, the three-axis electronic compass 281 functions as an attitude detection unit that detects the attitude of the casing of the high sensitivity receiving apparatus 102 in space. The three-axis electronic compass 281 supplies information indicating the measured attitude (orientation) of the casing of the high sensitivity receiving apparatus 102 to the control unit 201.

  The control unit 201 controls the antenna selection unit 212 to select the antenna 211 based on the information supplied from the three-axis electronic compass 281, that is, the attitude of the casing of the high sensitivity receiving apparatus 102. That is, the antenna selection unit 212 selects an antenna to be used for signal reception based on the attitude of the casing of the high sensitivity receiving apparatus 102. Then, the control unit 201 controls the processing selection unit 213 to select the reception unit 215 and controls the reception unit 215 to execute processing such as demodulation on the reception signal received via the antenna 211. That is, the reception unit 215 receives a signal via the antenna 211 selected by the antenna selection unit 212.

  In this way, signal reception can be performed using the antenna selected according to the attitude of the casing of the high sensitivity receiver 102. Therefore, the high sensitivity receiver 102 has an antenna with better performance. Signal reception. Therefore, the high sensitivity receiving apparatus 102 can perform data reception with higher sensitivity, and can suppress a reduction in communication quality. Note that the high-sensitivity receiving apparatus 102 can select an antenna without receiving a signal transmitted from the communication partner (transmitting apparatus 101), and therefore does not wait for a signal from the communication partner (that is, at a higher speed). ) The antenna can be selected. That is, the reduction in communication quality can be suppressed at higher speed.

  Note that the antenna selection unit 212 may select an antenna arranged on the space side based on the attitude of the housing of the high-sensitivity receiving apparatus 102. In general, antenna characteristics are improved when no other object is present in the surrounding area. Therefore, by doing so, the high sensitivity receiving apparatus 102 can perform signal reception using an antenna with better performance.

  For example, when the situation around the high-sensitivity receiving apparatus 102 (such as the presence of a nearby object) is known, the antenna is selected based on the attitude of the casing of the high-sensitivity receiving apparatus 102 with respect to the situation. do it. For example, when it is clear that the roof or wall of the building 112 is located in a predetermined direction when viewed from the high sensitivity receiver 102 in a state where the high sensitivity receiver 102 is installed in the building 112, the high sensitivity By selecting an antenna in a direction opposite to that of the building 112 based on the attitude of the housing of the receiving device 102, an antenna arranged on the space side can be selected.

  Further, for example, when the situation around the high sensitivity receiving apparatus 102 is unknown, an antenna on the upper side (empty side, opposite to the ground) of the casing of the high sensitivity receiving apparatus 102 may be selected. . In general, since the ground exists on the lower side of the casing of the high sensitivity receiving apparatus 102, the space is narrower than the upper side, and the radiation efficiency of radio waves is often reduced. Therefore, by selecting the antenna on the upper side of the casing of the high sensitivity receiver 102 based on the attitude of the casing of the high sensitivity receiver 102, the possibility of selecting an antenna with better performance is increased. Therefore, it is possible to suppress a reduction in communication quality.

  Note that the posture detection unit may be detected by an acceleration sensor, for example. Other than a 3-axis electronic compass may be used. Moreover, you may make it detect with another apparatus. For example, the high sensitivity receiving apparatus 102 may be imaged by an imaging apparatus, and the attitude of the casing of the high sensitivity receiving apparatus 102 may be detected based on the captured image. Further, the attitude of the casing of the high sensitivity receiving apparatus 102 may be detected by a plurality of methods. That is, the method for detecting the attitude of the casing of the high sensitivity receiving apparatus 102 is arbitrary.

<Flow of reception processing>
With reference to the flowchart of FIG. 10, an example of the flow of reception processing executed by the high sensitivity receiver 102 in this case will be described. When the reception process is started, the three-axis electronic compass 281 is controlled by the control unit 201, and detects the attitude of the casing of the high sensitivity receiving apparatus 102 in step S191. The control unit 201 acquires the information and grasps the attitude of the casing of the high sensitivity receiving apparatus 102.

  In step S192, the antenna selection unit 212 is controlled by the control unit 201, and according to the attitude of the casing of the high sensitivity receiving apparatus 102 detected in step S191, the antenna 211-1 and the antenna 211-2 are Choose the one with the best performance.

  In step S193, the process selection unit 213 is controlled by the control unit 201 to switch the connection to the antenna 211 to the carrier sense side. That is, the process selection unit 213 connects the carrier sense unit 214 to the antenna selection unit 212.

  In step S194, the carrier sense unit 214 is controlled by the control unit 201, performs carrier sense, and confirms whether the frequency band used for signal reception is free.

  If it is confirmed that the frequency band is vacant, in step S195, the process selection unit 213 is controlled by the control unit 201 to switch the connection to the antenna 211 to the reception side. That is, the process selection unit 213 connects the reception unit 215 to the antenna selection unit 212. As a result, the receiving unit 215 is connected to the antenna 211-1 and the antenna 211-2 selected in step S192.

  In step S196, the reception unit 215 performs reception under the control of the control unit 201. That is, the reception unit 215 receives a signal via the antenna 211 selected by the antenna selection unit 212, acquires the reception signal via the antenna selection unit 212 and the processing selection unit 213, and converts the received signal into the acquired reception signal. On the other hand, predetermined processing such as demodulation is performed, and data supplied from the transmission apparatus 101 is acquired. When the signal reception ends, the reception process ends.

  By executing each process as described above, the high sensitivity receiving apparatus 102 can perform signal reception using an antenna according to the attitude of the casing of the high sensitivity receiving apparatus 102. That is, the high sensitivity receiving apparatus 102 can select an antenna with better performance. Therefore, for example, even in a situation where the position of the antenna is located in the vicinity of the object, the high sensitivity receiving apparatus 102 can perform data reception with higher sensitivity by switching a plurality of antennas. That is, the high sensitivity receiving apparatus 102 can improve the data reception success rate, and can suppress a reduction in communication quality.

  Note that the high-sensitivity receiving apparatus 102 can select an antenna without receiving a signal transmitted from the communication partner (transmitting apparatus 101), and therefore does not wait for a signal from the communication partner (that is, at a higher speed). ) The antenna can be selected. That is, the reduction in communication quality can be suppressed at higher speed.

  Note that the timing of posture detection and antenna selection is arbitrary. As described above, it may be performed before carrier sensing, may be performed constantly in parallel with carrier sensing or signal reception, or may be performed at a predetermined time. Further, it may be periodically repeated at a predetermined time interval, or may be repeatedly performed irregularly.

<6. Other>
<Anti-theft system>
In the above, the position notification system 100 has been described as an example, but the present technology can be applied to any communication system. For example, the transmission apparatus 101 may be installed not only on a person but also on a moving body.

  For example, the present technology can also be applied to an anti-theft system 800 for preventing theft of automobiles, motorcycles and the like as shown in FIG. In the case of this anti-theft system 800, the transmission apparatus 101 is installed in an object whose position is monitored by the user, for example, an automobile 801 or a motorcycle 802 owned by the user. As in the case of the position notification system 100, the transmission apparatus 101 notifies the high-sensitivity reception apparatus 102 of its own position information (that is, position information of the automobile 801 and the motorcycle 802) as appropriate. That is, as in the case of the position notification system 100, the user can access the server 104 from the terminal device 105 and grasp the positions of the automobile 801 and the motorcycle 802. Therefore, since the user can grasp the positions of the automobile 801 and the motorcycle 802 even if the user is stolen, the user can easily retrieve the automobile 801 and the motorcycle 802.

  In the case of such an anti-theft system 800 as well, the application of the present technology described in each embodiment to the transmission device 101 and the high sensitivity receiving device 102 can suppress a reduction in communication quality. Position information (that is, position information of the automobile 801 and the motorcycle 802) can be more accurately notified to the high sensitivity receiving apparatus 102. That is, even when the user is stolen, the user can easily and accurately grasp the positions of the automobile 801 and the motorcycle 802.

<Other communication systems>
Information transmitted and received between the transmission device 101 and the high sensitivity reception device 102 is arbitrary. For example, the transmission apparatus 101 may transmit transmission information including identification information such as images, sounds, measurement data, devices, parameter setting information, or control information such as commands. The transmission information may include a plurality of types of information such as an image and sound, identification information, setting information, and control information.

  Further, for example, the transmission apparatus 101 may be able to transmit transmission information including information supplied from another apparatus. For example, the transmission device 101 may have an image, light, brightness, saturation, electricity, sound, vibration, acceleration, speed, angular velocity, force, temperature (not temperature distribution), humidity, distance, area, volume, shape, flow rate, Generate and send transmission information including information (sensor output) output from various sensors that perform detection or measurement for any variable such as time, time, magnetism, chemical substance, or odor, or the amount of change. You may make it do.

  In other words, the present technology, for example, three-dimensional shape measurement, spatial measurement, object observation, moving deformation observation, biological observation, authentication processing, monitoring, autofocus, imaging control, illumination control, tracking processing, input / output control, electronic device control, The present invention can be applied to a system used for any application such as actuator control.

  Further, the present technology can be applied to a system in an arbitrary field such as traffic, medical care, crime prevention, agriculture, livestock industry, mining, beauty, factory, home appliance, weather, and nature monitoring. For example, the present technology can also be applied to a system that captures an image for viewing using a digital camera, a portable device with a camera function, or the like. In addition, for example, this technology monitors in-vehicle systems, traveling vehicles, and roads that photograph the front, rear, surroundings, and interiors of automobiles for safe driving such as automatic stop and recognition of the driver's condition. The present invention can also be applied to a system used for traffic, such as a surveillance camera system that performs a distance measurement between vehicles or the like. Furthermore, for example, the present technology can also be applied to a system provided for security using a security camera for surveillance purposes, a camera for personal authentication purposes, or the like. In addition, for example, the present technology can also be applied to a system provided for sports using various sensors that can be used for sports applications such as a wearable camera. Furthermore, for example, the present technology can also be applied to a system used for agriculture using various sensors such as a camera for monitoring the state of a field or crop. In addition, for example, the present technology can also be applied to a system used for livestock industry that uses various sensors for monitoring the state of livestock such as pigs and cows. Furthermore, the present technology can be applied to systems that monitor natural conditions such as volcanoes, forests, and oceans, meteorological observation systems that observe weather, temperature, humidity, wind speed, sunshine hours, and so on, such as birds, fish, and reptiles. It can also be applied to a system for observing the ecology of wildlife such as moss, amphibians, mammals, insects and plants.

<Communication device>
Furthermore, the specification of the radio signal and information transmitted / received is arbitrary. Further, in the above description, an example in which the present technology is applied to the transmission device 101 and the high-sensitivity reception device 102 has been described. However, the present technology is also applicable to an arbitrary transmission device, an arbitrary reception device, and an arbitrary transmission / reception device. Can do. That is, the present technology can be applied to any communication device or communication system.

<Computer>
The series of processes described above can be executed by hardware or can be executed by software. Also, some processes can be executed by hardware, and other processes can be executed by software. When a series of processing is executed by software, a program constituting the software is installed in the computer. Here, the computer includes, for example, a general-purpose personal computer that can execute various functions by installing a computer incorporated in dedicated hardware and various programs.

  FIG. 12 is a block diagram illustrating a hardware configuration example of a computer that executes the above-described series of processing by a program.

  In the computer 900 shown in FIG. 12, a CPU (Central Processing Unit) 901, a ROM (Read Only Memory) 902, and a RAM (Random Access Memory) 903 are connected to each other via a bus 904.

  An input / output interface 910 is also connected to the bus 904. An input unit 911, an output unit 912, a storage unit 913, a communication unit 914, and a drive 915 are connected to the input / output interface 910.

  The input unit 911 includes, for example, a keyboard, a mouse, a microphone, a touch panel, an input terminal, and the like. The output unit 912 includes, for example, a display, a speaker, an output terminal, and the like. The storage unit 913 includes, for example, a hard disk, a RAM disk, a nonvolatile memory, and the like. The communication unit 914 includes a network interface, for example. The drive 915 drives a removable medium 921 such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory.

  In the computer configured as described above, the CPU 901 loads the program stored in the storage unit 913 into the RAM 903 via the input / output interface 910 and the bus 904 and executes the program, for example. Is performed. The RAM 903 also appropriately stores data necessary for the CPU 901 to execute various processes.

  The program executed by the computer (CPU 901) can be recorded and applied to, for example, a removable medium 921 as a package medium or the like. In that case, the program can be installed in the storage unit 913 via the input / output interface 910 by attaching the removable medium 921 to the drive 915. This program can also be provided via a wired or wireless transmission medium such as a local area network, the Internet, or digital satellite broadcasting. In that case, the program can be received by the communication unit 914 and installed in the storage unit 913. In addition, this program can be installed in the ROM 902 or the storage unit 913 in advance.

<Supplement>
Embodiments of the present technology are not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present technology.

  For example, the present technology may be applied to any configuration that constitutes an apparatus or a system, such as a processor as a system LSI (Large Scale Integration), a module that uses a plurality of processors, a unit that uses a plurality of modules, etc. It can also be implemented as a set or the like to which functions are added (that is, a partial configuration of the apparatus).

  In this specification, the system means a set of a plurality of components (devices, modules (parts), etc.), and it does not matter whether all the components are in the same housing. Accordingly, a plurality of devices housed in separate housings and connected via a network and a single device housing a plurality of modules in one housing are all systems. .

  For example, the configuration described as one device (or processing unit) may be divided and configured as a plurality of devices (or processing units). Conversely, the configurations described above as a plurality of devices (or processing units) may be combined into a single device (or processing unit). Of course, a configuration other than that described above may be added to the configuration of each device (or each processing unit). Furthermore, if the configuration and operation of the entire system are substantially the same, a part of the configuration of a certain device (or processing unit) may be included in the configuration of another device (or other processing unit). .

  In addition, for example, the present technology can take a configuration of cloud computing in which one function is shared by a plurality of devices via a network and jointly processed.

  Further, for example, the above-described program can be executed in an arbitrary device. In that case, the device may have necessary functions (functional blocks and the like) so that necessary information can be obtained.

  Further, for example, each step described in the above flowchart can be executed by being shared by a plurality of apparatuses in addition to being executed by one apparatus. Furthermore, when a plurality of processes are included in one step, the plurality of processes included in the one step can be executed by being shared by a plurality of apparatuses in addition to being executed by one apparatus. In other words, a plurality of processes included in one step can be executed as a process of a plurality of steps. Conversely, the processing described as a plurality of steps can be collectively executed as one step.

  The program executed by the computer may be such that the processing of steps describing the program is executed in time series in the order described in this specification, or in parallel or when a call is made. It may be executed individually at the required timing. That is, as long as no contradiction occurs, the processing of each step may be executed in an order different from the order described above. Furthermore, the processing of the steps describing this program may be executed in parallel with the processing of other programs, or may be executed in combination with the processing of other programs.

  As long as no contradiction arises, the technologies described in the present specification can be implemented independently. Of course, any of a plurality of present technologies can be used in combination. For example, part or all of the present technology described in any of the embodiments can be combined with part or all of the present technology described in other embodiments. Moreover, a part or all of the arbitrary present technology described above can be implemented in combination with other technologies not described above.

The present technology can also have the following configurations.
(1) a selection unit that selects an antenna to be used for transmission from the plurality of antennas based on reception power of all channels in a frequency band used for transmission of each of the plurality of antennas;
A signal processing apparatus comprising: a transmission unit that transmits a signal using the antenna selected by the selection unit.
(2) The signal processing device according to (1), wherein the selection unit selects an antenna based on a sum of received power of each channel in the frequency band.
(3) The signal processing device according to (2), wherein the selection unit selects an antenna having a maximum sum of the reception powers.
(4) For each antenna, further includes a received power calculation unit that measures received power in each channel of the frequency band and calculates a sum of received power for all channels,
The signal processing apparatus according to (3), wherein the selection unit is configured to select an antenna having a maximum sum of the reception power calculated by the reception power calculation unit.
(5) Based on the received power of all the channels in the frequency band used for transmission of each of the plurality of antennas, the antenna used for transmission is selected from the plurality of antennas,
A signal processing method for transmitting a signal using a selected antenna.

(6) a selection unit that selects an antenna to be used for reception from the plurality of antennas based on reception power of all channels in a frequency band used for reception of each of the plurality of antennas;
A signal processing apparatus comprising: a reception unit that receives a signal using the antenna selected by the selection unit.
(7) The signal processing device according to (6), wherein the selection unit selects an antenna based on a sum of received power of each channel in the frequency band.
(8) The signal processing device according to (7), wherein the selection unit selects an antenna having a maximum sum of the received power.
(9) For each antenna, further includes a received power calculation unit that measures received power in each channel of the frequency band and calculates a sum of received power for all channels,
The signal processing apparatus according to (8), wherein the selection unit is configured to select an antenna having a maximum sum of the reception power calculated by the reception power calculation unit.
(10) Based on the reception power of all the channels in the frequency band used for reception of each of the plurality of antennas, the antenna used for reception is selected from the plurality of antennas,
A signal processing method for receiving a signal using a selected antenna.

(11) a selection unit that selects an antenna to be used for transmission from a plurality of antennas based on the attitude of the housing;
A signal processing apparatus comprising: a transmission unit that transmits a signal using the antenna selected by the selection unit.
(12) The signal processing device according to (11), wherein the selection unit selects an antenna disposed on a space side.
(13) A posture detection unit that detects the posture of the housing is further provided,
The signal processing device according to (12), wherein the selection unit is configured to select an antenna disposed on the space side based on the posture of the housing detected by the posture detection unit.
(14) The signal processing device according to (13), wherein the posture detection unit is a three-axis electronic compass that detects a direction in which the housing is directed.
(15) Select an antenna to be used for transmission from a plurality of antennas based on the attitude of the housing,
A signal processing method for transmitting a signal using a selected antenna.

(16) a selection unit that selects an antenna to be used for reception from a plurality of antennas based on the attitude of the housing;
A signal processing apparatus comprising: a reception unit that receives a signal using the antenna selected by the selection unit.
(17) The signal processing device according to (16), wherein the selection unit selects an antenna arranged on a space side.
(18) A posture detection unit that detects the posture of the housing is further provided,
The signal processing device according to (17), wherein the selection unit is configured to select an antenna disposed on the space side based on the posture of the housing detected by the posture detection unit.
(19) The signal processing device according to (18), wherein the posture detection unit is a three-axis electronic compass that detects a direction in which the housing is directed.
(20) Select an antenna to be used for reception from a plurality of antennas based on the attitude of the housing,
A signal processing method for receiving a signal using a selected antenna.

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Claims (20)

A selection unit that selects an antenna to be used for transmission from the plurality of antennas based on reception power of all channels in a frequency band used for transmission of each of the plurality of antennas;
A signal processing apparatus comprising: a transmission unit that transmits a signal using the antenna selected by the selection unit. The signal processing apparatus according to claim 1, wherein the selection unit selects an antenna based on a sum of received power of each channel in the frequency band. The signal processing apparatus according to claim 2, wherein the selection unit selects an antenna having a maximum sum of the received power. For each antenna, further comprising a received power calculation unit that measures received power in each channel of the frequency band and calculates the sum of received power for all channels,
The signal processing apparatus according to claim 3, wherein the selection unit is configured to select an antenna having a maximum sum of the reception power calculated by the reception power calculation unit. Based on the received power of all channels in the frequency band used for transmission of each of the plurality of antennas, the antenna used for transmission is selected from the plurality of antennas,
A signal processing method for transmitting a signal using a selected antenna. A selection unit that selects an antenna to be used for reception from the plurality of antennas based on reception power of all channels in a frequency band used for reception of each of the plurality of antennas;
A signal processing apparatus comprising: a reception unit that receives a signal using the antenna selected by the selection unit. The signal processing apparatus according to claim 6, wherein the selection unit selects an antenna based on a sum of received power of each channel in the frequency band. The signal processing apparatus according to claim 7, wherein the selection unit selects an antenna having a maximum sum of the received power. For each antenna, further comprising a received power calculation unit that measures received power in each channel of the frequency band and calculates the sum of received power for all channels,
The signal processing apparatus according to claim 8, wherein the selection unit is configured to select an antenna having a maximum sum of the reception power calculated by the reception power calculation unit. Based on the received power of all channels in the frequency band used for receiving each of the plurality of antennas, the antenna used for reception is selected from the plurality of antennas,
A signal processing method for receiving a signal using a selected antenna. A selection unit that selects an antenna to be used for transmission from a plurality of antennas based on the attitude of the housing;
A signal processing apparatus comprising: a transmission unit that transmits a signal using the antenna selected by the selection unit. The signal processing device according to claim 11, wherein the selection unit selects an antenna arranged on a space side. A posture detecting unit for detecting the posture of the housing;
The signal processing device according to claim 12, wherein the selection unit is configured to select an antenna disposed on the space side based on the posture of the housing detected by the posture detection unit. The signal processing device according to claim 13, wherein the posture detection unit is a three-axis electronic compass that detects a direction in which the housing is directed. Select the antenna to be used for transmission from multiple antennas based on the attitude of the housing,
A signal processing method for transmitting a signal using a selected antenna. A selection unit that selects an antenna to be used for reception from a plurality of antennas based on the attitude of the housing;
A signal processing apparatus comprising: a reception unit that receives a signal using the antenna selected by the selection unit. The signal processing device according to claim 16, wherein the selection unit selects an antenna arranged on a space side. A posture detecting unit for detecting the posture of the housing;
The signal processing device according to claim 17, wherein the selection unit is configured to select an antenna disposed on the space side based on the posture of the housing detected by the posture detection unit. The signal processing apparatus according to claim 18, wherein the posture detection unit is a three-axis electronic compass that detects a direction in which the housing is directed. Select the antenna to be used for reception from multiple antennas based on the attitude of the housing,
A signal processing method for receiving a signal using a selected antenna.

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