WO2018173119A1 - Radio communication apparatus, radio communication system and radio communication method - Google Patents

Abstract

In a radio communication in which a plurality of channels (sub-bands) are used to perform communications and further the frequencies of the plurality of channels that are used are caused to hop in a predetermined period, it is intended to make it possible to perform a control that is optimal as a whole. For this purpose, a radio communication apparatus comprises: a transmission unit 201 that divides transmission data into a plurality of transmission streams and then encodes and modulates each of the plurality of transmission streams according to a transmission parameter that is set for each transmission stream; a transmission frequency conversion unit 202 that converts the transmission streams to radio frequency signals that hop the subcarriers included in mutually different sub-band frequencies; and a transmission power control unit 203 that controls the transmission powers of the radio frequency signals according to a transmission parameter that is set for each plurality of transmission streams, wherein the transmission parameter that is set for each plurality of transmission streams satisfies a transmission rate specified in advance under the reception qualities of the sub-band frequencies at which the plurality of transmission streams are transmitted, and is set on the basis of an criterion specified for the entirety of the plurality of transmission streams.

Description

Wireless communication apparatus, wireless communication system, and wireless communication method

The present invention relates to frequency division multiplexing wireless communication, and more particularly to wireless communication that performs communication using a plurality of channels (subbands) between devices and hops the frequencies of a plurality of channels to be used at a predetermined cycle.

The frequency hopping method has excellent anti-jamming performance and anti-interception performance and is used for highly confidential wireless communications. Patent Document 1 discloses a multiband OFDM system. In the multiband OFDM method, the bandwidth of 3.1 GHz to 10.6 GHz is divided into subbands of 528 MHz units, and OFDM (Orthogonal Frequency Division Multiplexing) is used as the secondary modulation, and the bandwidth of one OFDM symbol is Each subband width is defined to be 528 MHz unit. Each subband consists of 128 subcarriers (128 tones), and communication is maintained by frequency hopping the subcarriers one after another.

On the other hand, in the field of mobile communication, carrier aggregation technology has been developed for the purpose of increasing the capacity and speed of data transmission as in LTE-Advanced. In the carrier aggregation technology, as an example, a transmission device and a reception device having a reception bandwidth that exceeds the transmission bandwidth of the transmission device are provided, and data is transmitted from a plurality of transmission devices each having a different frequency band, and received. The data rate can be improved by receiving data transmitted from a plurality of transmission devices in the device.

JP 2010-109556 A

In the wireless communication system of Patent Document 1, a band group including two or three subbands is formed, and frequency hopping is performed within the band group. One subband is used at some point. In such a wireless communication system, the concept of carrier aggregation is applied in order to increase the capacity and speed of data transmission. That is, a plurality of transmission / reception streams can be simultaneously communicated using a plurality of subbands, and frequency hopping can be realized by periodically switching a combination of a plurality of subbands.

However, since the radio frequency of each transmission / reception stream is different, the transmission path characteristics are different depending on the hopping frequency (subband frequency). For this reason, simply performing adaptive modulation by looking at the reception quality for each channel (for each subband) may cause excess or deficiency in the data transmission performance of the entire system. For example, when communication is performed with three channels, if the channel characteristics of two channels are good and the channel characteristics of one channel are bad, and if the channel is individually controlled, the channel with poor channel characteristics is usually In such a case, control is performed to compensate for poor transmission path characteristics, such as increasing transmission power. However, if the channel characteristics of the other channels are good and the channel with poor channel characteristics has nothing to do with the data rate as a whole even if nothing is done, excessive control has been performed. Therefore, it is necessary to perform optimal control as a whole in accordance with the combination of frequencies.

A wireless communication device that performs wireless communication using multiple channels and hops the frequencies of multiple channels at a predetermined cycle, and divides transmission data from an upper layer into multiple transmission streams, and is set for each of multiple transmission streams Radio that hops subcarriers included in different subband frequencies for a transmission unit that encodes and modulates each of a plurality of transmission streams, and for each of the plurality of transmission streams that are output from the transmission unit, according to transmission parameters A transmission frequency conversion unit for converting to a frequency signal, a transmission power control unit for controlling transmission power of a plurality of radio frequency signals output from the transmission frequency conversion unit according to transmission parameters set for each of a plurality of transmission streams, A plurality of antennas that output a plurality of radio frequency signals output from the transmission power control unit; The transmission parameters set for each of the plurality of transmission streams satisfy a predetermined transmission rate under the reception quality of the subband frequency at which the plurality of transmission streams are transmitted, and are determined for the whole of the plurality of transmission streams. It shall be set based on the established standard.

In wireless communication in which communication is performed using multiple channels (subbands) and the frequencies of multiple channels to be used are hopped at a predetermined cycle, it is possible to perform optimal control as a whole according to the combination of frequencies Become.

2 is a functional block diagram of Embodiment 1. FIG. It is a figure which shows the frequency band which performs frequency hopping. It is a functional block diagram of a transmission / reception apparatus. It is a functional block diagram of a transmission part. It is a functional block diagram of a receiving part. It is an example of a frequency versus reception quality table. It is a figure for demonstrating the setting method of the transmission parameter of each channel. It is a flowchart which sets the transmission parameter of each channel. It is an example of a change in transmission parameters when the evaluation function is to improve reception performance (transmission rate is constant). It is an example of a change in transmission parameters when the evaluation function is power saving (transmission rate constant). 6 is a functional block diagram of Embodiment 2. FIG. It is an example of an opposing frequency vs. reception quality table. 10 is a functional block diagram of Embodiment 3. FIG. It is a functional block diagram of a transmission part. It is an example of the frequency vs. reception quality table for each single path. It is an example of the frequency vs. reception quality table for each total path.

FIG. 1A shows a functional block diagram of the first embodiment. The first embodiment is a communication system having a transmission / reception device (A) 101-1 and a transmission / reception device (B) 101-2 and performing one-to-one communication. The transmission / reception device (A) and the transmission / reception device (B) communicate using N channel (N: a plurality of integers) communication paths. Further, an OFDM (Orthogonal Frequency Division Multiplexing) method is used as the wireless communication method. FIG. 1B shows a frequency band for performing frequency hopping. Although the present embodiment is not limited to a specific communication standard, the frequency band to be used is divided into m subbands (frequency bands of the respective subbands are expressed as F1 to Fm). In addition, each subband has subcarriers f1 to fl (l: integer), and the subcarriers are orthogonal to each other, so that the subcarrier interval can be reduced and the transmission frequency band can be efficiently used. Can be used. In one channel, communication is maintained by selecting one subband and frequency hopping the subcarriers one after another. Further, the communication between the transmitting and receiving apparatuses 101 is performed by applying a frequency hopping method and selecting N channels from m subbands F1 to Fm, and in addition, selecting N channels as channels at regular time intervals. This is done while changing the combination of subbands. How to change the combination pattern of the subbands is determined in advance in the communication system.

FIG. 2 shows a functional block diagram of the transmission / reception device 101. The transmission / reception apparatus 101 includes a transmission unit 201, a transmission frequency (TX frequency) conversion unit 202, a transmission power control unit 203, a transmission / reception switch 204, transmission / reception antennas 205-1 to N, a reception frequency (RX frequency) conversion unit 206, and a reception unit. 207 and a hopping frequency setting unit 208.

First, the data transmission process will be described. Transmitting section 201 divides input data from the upper layer into N transmission streams, and generates a modulation signal based on reception quality information from receiving section 207 and hopping frequency information from hopping frequency setting section 208. Details of the transmission unit 201 will be described later with reference to FIG.

The transmission frequency conversion unit 202 converts each stream output from the transmission unit 201 from an intermediate frequency modulation signal to a radio frequency signal of a predetermined radio frequency based on the hopping frequency information from the hopping frequency setting unit 208. The transmission power of each stream output from the transmission frequency conversion unit 202 is controlled by the transmission power control unit 203 based on the transmission power control information set by the transmission unit 201. The transmission / reception switch 204 switches the connection of the antennas 205-1 to N to the transmission side, and the radio frequency signal of each stream is output from the antennas 205-1 to N.

Fig. 3 shows a functional block diagram of the transmission unit 201. The transmission unit 201 includes a data division unit 301, a preamble header addition unit 302, an encoding unit 303, an interleaving unit 304, a modulation unit 305, and a transmission parameter setting unit 306.

The data dividing unit 301 divides input data from the upper layer into N transmission streams.

The preamble header adding unit 302 adds a preamble symbol and a header symbol to the divided input data. The transmission / reception frame is a frame having a general configuration having a preamble symbol at the beginning, a header symbol at the end, and a data symbol at the end. Preamble header adding section 302 receives reception quality information from data reception section 207 and the data symbol coding rate and modulation scheme set by transmission parameter setting section 306 for each channel through which each stream is transmitted. The preamble symbol is a predetermined symbol pattern for synchronously capturing transmission / reception frames. Also, the header symbol includes control information including reception quality information from reception section 207, data symbol coding rate and modulation scheme set by transmission parameter setting section 306.

The encoding unit 303 performs error correction encoding based on the encoding rate of each stream set by the transmission parameter setting unit 306.

The interleave unit 304 rearranges the data of each stream output from the encoding unit 303 with a predetermined interleave pattern. The interleave pattern may be different for each stream.

The modulation unit 305 performs modulation mapping based on the modulation scheme of each stream set by the transmission parameter setting unit 306.

The transmission parameter setting unit 306 determines the transmission parameter of each stream from the reception quality information of each channel obtained by the reception unit 207 for the plurality of streams set by the hopping frequency setting unit 208. The transmission parameters include a coding rate, a modulation scheme, and a transmission power control value. The set coding rate is output to preamble header adding section 302 and encoding section 303, the set modulation scheme is output to preamble header adding section 302 and modulating section 305, and the set transmission power control value is output to transmission power control section 203. The method for determining the transmission parameter depends on the evaluation function (target) of the system. A method for determining the transmission parameter will be described later. Note that the coding rate and modulation scheme set by transmission parameter setting section 306 are applied to data symbols. The header symbol is subjected to error correction coding and modulation by a predetermined coding method and modulation method in the communication system.

Next, the data reception process will be described. When the transmission / reception switch 204 shown in FIG. 2 switches the connection of the antennas 205-1 to 205-N to the reception side, the reception frequency converting unit 206 is based on the hopping frequency information from the hopping frequency setting unit 208. Each stream received at 1 to N is converted from a radio frequency signal to an intermediate frequency signal.

The receiving unit 207 demodulates and decodes the received signal, and calculates and stores the received quality of each channel. The reception quality information obtained by the reception unit 207 is output to the transmission unit 201. Details of the receiving unit 207 will be described with reference to FIG.

FIG. 4 shows a functional block diagram of the receiving unit 207. The reception unit 207 includes a demodulation unit 401, a deinterleaving unit 402, a decoding unit 403, a header analysis unit 404, a data combination unit 405, a reception quality measurement unit 406, and a frequency / reception quality table update unit 407.

As described above, the header symbol is subjected to error correction coding and modulation by a predetermined coding method and modulation method in the communication system. Therefore, the header symbol in the received frame is demodulated and decoded by a predetermined encoding method and modulation method, and input to the header analysis unit 404. The header analysis unit 404 extracts control information such as a data symbol coding rate and modulation scheme from the header symbol of the received frame. The modulation scheme of the extracted data symbol is transmitted to the demodulation unit 401, and the coding rate of the extracted data symbol is transmitted to the decoding unit 403, so that the data symbol following the header symbol is demodulated and decoded.

The demodulator 401 demodulates the received signal of each stream and calculates a received bit LLR (Log Likelihood Ratio). Here, the received bit LLR L is represented by (Equation 1) when the probability that the received bit is 0 is p ₀ and the probability that the received bit is L ₁ is p ₁ .

　デインタリーブ部402は、復調部401から出力された各ストリームに対してデインタリーブを行い、インタリーブ部304で並び替えられた系列を元の順序に戻す。

Deinterleaving section 402 performs deinterleaving on each stream output from demodulation section 401, and returns the sequence rearranged by interleaving section 304 to the original order.

The decoding unit 403 performs error correction decoding on the received bit LLR of each stream output from the deinterleaving unit 402. Thereby, the reception bit of the data symbol of each stream is determined to be 1 or 0.

The data combining unit 405 concatenates the error correction decoding results of each stream and outputs them to the upper layer.

Reception quality measurement section 406 calculates reception quality from the demodulated bit LLR of each reception stream. The mutual information ^IE shown in (Expression 2) is used as the reception quality.

ここで、Ｌは復調結果の受信ビットLLR、Ｎ_ｂは測定単位のビット数、Ｈ_ｂはバイナリーエントロピー関数である。受信品質情報として相互情報量Ｉ^Ｅを用いることで、ビット単位での受信品質を求めることができ、きめ細かな制御が可能になる。

Here, L is the received bit LLR of the demodulation result, N _b is the number of bits in the measurement unit, and H _b is a binary entropy function. By using the mutual information amount ^IE as the reception quality information, the reception quality in units of bits can be obtained, and fine control is possible.

The reception quality information is not limited to the mutual information amount ^IE , but SNR (Signal to Noise Power Ratio), CNR (Carrier to Noise Ratio), MER (Modulation Error Ratio). : Modulation Error Ratio).

The frequency-to-reception quality table update unit 407 updates the frequency-to-reception quality table extracted from the header symbol of the received frame from the header analysis unit 404. The frequency versus reception quality table is a table that stores the reception quality at the communication target device for each frequency of the subband. An example of the frequency versus reception quality table is shown in FIG. The reception quality is a mutual information amount ^IE of the signal received by the transmission / reception device on the reception side, and is expressed by a normalized value in the range of 0 to 1, and indicates that the reception quality is better as the value approaches 1. Note that the value of the reception quality is an example, and is not limited to this, and an index such as SNR, CNR, or MER can be used. The example of FIG. 5 is a table in the case where the multiplexing number N = 3 and the channel 1 uses the subband frequency F1, the channel 2 uses the subband frequency F6, and the channel 3 uses the subband frequency F4. An example is shown.

The measurement result of the reception quality measurement unit 406 is used for updating the frequency versus reception quality table. Since the reception quality of the subband frequency varies with time, the reception quality update may overwrite the reception quality at the nearest time, or may perform weighted averaging in the time direction.

A description will be given of how the transmission parameter setting unit 306 of the transmission unit 201 selects a coding rate and a modulation scheme when the channel selection and reception quality shown in FIG. . In this system, since a plurality of channels (subbands) are simultaneously used for data transmission, in the example of FIG. 5, three channels can be optimized for the entire channel.

The transmission parameter setting method for each channel will be described with reference to FIG. The following example is an example, and specific transmission parameters that can be set are determined in the communication system. Here, in the communication system of the present embodiment, the transmission power control value can be switched between low, medium and high, the coding rate R can be switched between 1/2 and 3/4, and the modulation scheme can be switched to BPSK ( Binary Phase Shift Keying), QPSK (Quadrature Phase Shift Keying), 16 QAM (16 Quadrature Amplitude Modulation), and 64 QAM (64 Quadrature Amplitude Modulation) can be switched. Regarding the modulation scheme, the amount of information that can be transmitted in one symbol in the order of BPSK, QPSK, 16QAM, and 64QAM increases, but is susceptible to noise. Similarly, the greater the coding rate, the weaker the tolerance for communication errors. Note that Reed-Solomon coding, convolutional coding, LDPC (Low Density Parity Check) coding, etc. can be applied as the coding method, and there is no limitation on the coding method.

FIG. 6 plots the reception quality necessary for applying each combination of transmission parameters, that is, the minimum mutual information I ^E _MIN when communication is performed at a predetermined communication rate. By comparing the required reception quality (minimum mutual information amount I ^E _MIN ) and the reception quality in each channel (subband), it becomes possible to extract combinations of transmission parameters that can be selected in each channel. In the example of FIG. 6, any combination is possible in the subband F1, whereas in the subband F6, transmission power control value: medium, coding rate R: 3/4, modulation scheme: 16QAM. Unless the combination of transmission parameters is less than the minimum mutual information amount in combination, it is not allowed. Similarly, in subband F4, a combination of transmission parameters that is less than or equal to the minimum mutual information amount in a combination of transmission power control value: high, coding rate R: 1/2, and modulation scheme: QPSK is not allowed.

FIG. 7 shows a flowchart for setting transmission parameters for each channel. First, the reception quality of each channel is read out from the frequency versus reception quality table extracted from the header symbol of the reception frame (S71). On the other hand, the transmission parameter setting unit 306 receives reception quality (minimum mutual) required for demodulating and decoding transmission data at a predetermined transmission rate for possible combinations of transmission parameters as shown in FIG. Information about the information amount I ^E _MIN ) is held in advance. A combination of transmission parameters applicable to each channel is extracted from the necessary reception quality information and the reception quality of each channel read from the frequency versus reception quality table (S72). In the example of FIG. 6, for example, in channel 3 (subband F4), the transmission power control value and the coding rate R can be arbitrarily combined in the modulation scheme BPSK, but the transmission power control value in the modulation scheme QPSK. : Applicable transmission parameter combinations can be extracted, such as high, coding rate R: 1/2, and applicable to modulation schemes 16QAM and 64QAM.

Since a plurality of applicable combinations of transmission parameters are normally found in each channel, a combination of transmission parameters to be applied to each channel is selected according to a predetermined criterion (evaluation function) (S73).

The predetermined standard (evaluation function) can be arbitrarily set in the communication system. For example, when the evaluation function is “reception performance improvement (transmission rate constant)”, the sum of the reception quality (minimum mutual information I ^E _MIN ) required when the combination of the transmission parameters is applied to each channel ( In the example of FIG. 6, a combination of transmission parameters that maximizes the evaluation function I ^E _MIN (F1) + I ^E _MIN (F4) + I ^E _MIN (F6)) is set.

When the evaluation function is “power saving (transmission rate constant)”, the sum of the transmission power P when the combination of the transmission parameters is applied to each channel (in the example of FIG. 6, the evaluation function P (F1 ) + P (F4) + P (F6)) is set to the transmission parameter combination that minimizes.

FIG. 8 shows an example of changes in transmission parameters when the evaluation function is “reception performance improvement (transmission rate constant)”. For example, for sub-band streams with poor quality, increase the transmission power by lowering the coding rate, for sub-band streams with good quality, increase the coding rate or multi-level modulation number, and for the loss rate of sub-band streams with poor quality To compensate. As a result, the data transmission rate in the entire plurality of channels is increased, and more data can be transmitted at high speed. On the other hand, FIG. 9 shows an example of changes in transmission parameters when the evaluation function is “power saving (transmission rate constant)”. The power consumption can be reduced by reducing the transmission power of a subband with good quality.

In this way, optimal data transmission between the transmitting and receiving apparatuses can be performed by setting the transmission parameters of each channel based on the criteria (evaluation function) defined for the entire plurality of channels used for data transmission between the transmitting and receiving apparatuses. Is possible. The evaluation function is not limited to the above-described one, and may be based on the water injection theorem or may be determined by machine learning.

Note that at the timing when the subbands used by each channel are switched, there is no reception quality information of the subband to be switched to. In this case, transmission may be performed with a coding rate, a modulation scheme, and a transmission power control value determined in advance in the communication system, or a hello packet (preamble thimble and Data packets may be started after transmission / reception is performed for each subband to be switched, and reception quality is measured.

FIG. 10 shows a functional block diagram of the second embodiment. The second embodiment is a communication system of 1: K (K is an integer of 2 or more). In FIG. 10, K = 2, and the transmission / reception device (A) 501-1 communicates with each of the transmission / reception device (B) 501-2 and the transmission / reception device (C) 501-3 with N channels (N: a plurality of integers). Communicate using the road. The functional blocks of the transmission / reception device 501 are the same as those in the first embodiment, and redundant description is omitted. The frequency vs. reception quality table is different from the first embodiment. That is, in the transmission / reception apparatus (A), as shown in FIG. 11, the frequency versus reception quality table is extended to include reception quality for each transmission / reception apparatus that performs communication. This expanded table is referred to as “opposed frequency vs. reception quality table”. In the example of FIG. 11, communication is performed using the subbands F1, F4, and F6 with the transmission / reception device (B) and using the subbands F2, F3, and Fm-1 with the transmission / reception device (C). To do. Thus, the transmission / reception device (A) can perform optimal data transmission between the transmission / reception devices with respect to the transmission / reception device (B) and the transmission / reception device (C).

In a 1: K communication system (K is an integer of 2 or more), it is necessary for a plurality of transmission / reception apparatuses to use a hopping pattern that does not use the same subband at the same timing. The hopping pattern is set at the time of network construction, and the hopping pattern to be used is notified from the transmission / reception device (A) to the transmission / reception device communicating with the transmission / reception device (A).

FIG. 12 shows a functional block diagram of the third embodiment. The third embodiment is a two-stage relay communication system as shown in FIG. 12, and includes a transmission / reception device (A) 801-1, a transmission / reception device (B) 801-2, a transmission / reception device (C) 801-3, and a transmission / reception device ( D) 801-4. In the communication system of FIG. 12, when communication is performed between the transmission / reception device (A) 801-1 and the transmission / reception device (D) 801-4, is a network via the transmission / reception device (B) 801-2 constructed? , Whether to construct a network via the transmission / reception device (C) 801-3 is selected (hereinafter referred to as “routing”).

The functional blocks of the transmission / reception device 801 are the same as those in the first and second embodiments, and a duplicate description is omitted. This embodiment is different from the first embodiment in that a block for performing processing for routing is added to the reception unit 207 '. FIG. 13 shows a functional block diagram of the receiving unit 207 '. Blocks denoted by the same reference numerals as those in the functional block diagram of FIG. 4 have the same functions as described in the first embodiment, and thus description thereof is omitted. The frequency-to-reception quality table update unit 407 ′ is different from the first embodiment in that the counter-frequency-to-reception quality table can be updated because the transmission / reception device may communicate with a plurality of transmission / reception devices. Yes. Further, a frequency-by-path frequency / reception quality table generating unit 1001 and a path quality information adding unit 1002 are newly provided.

In the communication system according to the third embodiment, each transmission / reception device transmits / receives a hello packet to / from other transmission / reception devices that may communicate for each subband at the time of network construction. The header of the reply frame of the hello packet includes reception quality information when the hello packet is received by another transmitting / receiving device. Further, in the present embodiment, the transmission / reception device serving as the relay station also checks the reception quality using the hello packet at the time of network construction, but the result of the reception quality performed by the relay station is also included in the header of the relay station. Thereby, the reception quality information with the transmission / reception apparatus (D) measured by the transmission / reception apparatuses (B) and (C) as relay stations is included in the headers of the transmission frames of the transmission / reception apparatuses (B) and (C), respectively. Then, it is transmitted to the transmission / reception device (A).

The per-path frequency versus reception quality table generating unit 1001 generates a single per-path frequency versus reception quality table 1100 as shown in FIG. 14 and a total per-path frequency versus reception quality table 1200 as shown in FIG. 14 and 15 are tables held by the transmission / reception apparatus (A) that is the starting point of communication. First, the frequency vs. reception quality table 1100 for each single path will be described.

In the table 1100, lines 1104 and 1105 generate reception quality information in the transmission / reception apparatus (A). As described above, the response frame header of the hello packet includes the reception quality information of the device (A) → the device (B). Further, the reception quality information of the device (B) → the device (A) can be obtained by measuring the reception quality of the response frame by the reception quality measuring unit 406. For example, the average value or the minimum value is taken as a representative value of these two values and used as the reception quality information of the single path AB. By transmitting the hello packet in all the subbands and receiving the response frame, the reception quality for each subband is obtained for the single path AB. The average value column 1102 is the average value of the reception quality for each reception quality of the subband, and the minimum value column 1103 is the minimum value of the reception quality for each subband. Rows 1106 and 1107 are extracted from the headers of the transmission packets from the transmission / reception device (B) and the transmission / reception device (C), respectively. The reception quality for each subband is performed by using the hello packet as described above in the transmission / reception device (B) and the transmission / reception device (C), respectively.

The total path frequency vs. reception quality table 1200 is generated from the single path frequency vs. reception quality table 1100. In the table of FIG. 15, as a representative value of the reception quality of the total route, the average sum column 1201 shows the sum of the average values of the single route reception quality, and the minimum value sum column 1202 shows the minimum value of the reception quality of the single route. Is stored. Note that the reception quality of the total route is not limited to the example of FIG.

The route quality information adding unit 1002 adds the total route information obtained by the frequency-by-route frequency vs. received quality table generating unit 1001 to the data series to be passed to the upper layer. The upper layer performs routing based on this total route quality information. For example, in the total route quality information shown in FIG. 15, when the selection criterion is the sum of the average of the single routes, the route is ABD, and when the selection criterion is the sum of the minimum values of the single routes, A -It becomes the route of CD. The selection criteria can be determined in the communication system. For example, when transmitting information that requires certainty, such as important control information, it is better to select the minimum value. For example, when transmitting moving image data that allows some noise, the average value should be selected. Good.

In the third embodiment, an example of the network configuration of the two-stage relay is shown, but a relay configuration with a further number of stages may be used. As described above, by storing and maintaining the reception quality of the single route and the total route, it is possible to perform optimum routing according to the hopping pattern. After the routing is determined and the network is constructed, as described in detail in the first embodiment, it is possible to perform optimal data transmission between the transmitting and receiving apparatuses adapted to the communication environment.

DESCRIPTION OF SYMBOLS 101 ... Transmission / reception apparatus, 201 ... Transmission part, 202 ... Transmission frequency conversion part, 203 ... Transmission power control part, 204 ... Transmission / reception switch, 205 ... Transmission / reception antenna, 206 ... Reception frequency conversion part, 207 ... Reception part, 208 ... Hopping Frequency setting unit, 301 ... data division unit, 302 ... preamble header addition unit, 303 ... encoding unit, 304 ... interleaving unit, 305 ... modulation unit, 306 ... transmission parameter setting unit, 401 ... demodulation unit, 402 ... deinterleaving unit 403: Decoding unit 404: Header analysis unit 405 Data combination unit 406 Reception quality measurement unit 407 Frequency vs. reception quality table update unit

Claims (7)

A wireless communication apparatus that performs wireless communication using a plurality of channels and hops the frequencies of the plurality of channels at a predetermined cycle,
A transmission unit that divides transmission data from an upper layer into a plurality of transmission streams, and encodes and modulates each of the plurality of transmission streams according to a transmission parameter set for each of the plurality of transmission streams;
A transmission frequency converter that converts each of the plurality of transmission streams output from the transmitter into radio frequency signals that hop subcarriers included in different subband frequencies;
A transmission power control unit that controls transmission power of a plurality of radio frequency signals output from the transmission frequency conversion unit according to transmission parameters set for each of the plurality of transmission streams;
A plurality of antennas that output the plurality of radio frequency signals output from the transmission power control unit,
The transmission parameters set for each of the plurality of transmission streams satisfy a predetermined transmission rate under the reception quality of the subband frequency at which the plurality of transmission streams are transmitted, and A wireless communication device set based on a predetermined standard. In claim 1,
The wireless communication apparatus is an evaluation function that maximizes a sum of reception qualities necessary for the plurality of transmission streams or an evaluation function that minimizes a sum of transmission powers necessary for the plurality of transmission streams. A wireless communication system that performs wireless communication using a plurality of channels between wireless communication devices that perform communication and hops the frequencies of the plurality of channels at a predetermined cycle,
Each of the wireless communication devices is
A transmission unit that divides transmission data from an upper layer into a plurality of transmission streams, and encodes and modulates each of the plurality of transmission streams according to a transmission parameter set for each of the plurality of transmission streams;
A transmission frequency converter that converts each of the plurality of transmission streams output from the transmitter into radio frequency signals that hop subcarriers included in different subband frequencies;
A transmission power control unit that controls transmission power of a plurality of radio frequency signals output from the transmission frequency conversion unit according to transmission parameters set for each of the plurality of transmission streams;
A plurality of antennas that output the plurality of radio frequency signals output from the transmission power control unit,
The transmission parameters set for each of the plurality of transmission streams satisfy a predetermined transmission rate under the reception quality of the subband frequency at which the plurality of transmission streams are transmitted, and A wireless communication system that is set based on a predetermined standard. In claim 3,
As a wireless communication device that performs the communication, a first wireless communication device and a second wireless communication device,
The first wireless communication apparatus is a wireless communication system having a receiving unit that extracts reception quality information measured in the second wireless communication apparatus from a header symbol of a return frame from the second wireless communication apparatus. In claim 3,
As the wireless communication devices that perform the communication, first to fourth wireless communication devices are included, and the first wireless communication device passes through the second wireless communication device or the third wireless communication device. A wireless communication system for communicating with the fourth wireless communication device,
The first wireless communication device includes reception quality information between the first wireless communication device and the second wireless communication device measured in the second wireless communication device, and in the third wireless communication device. Received quality information between the first wireless communication device and the third wireless communication device measured, the third wireless communication device and the fourth wireless communication device measured in the fourth wireless communication device Reception quality information between the second wireless communication device and the fourth wireless communication device measured in the fourth wireless communication device, and the received reception quality information , A wireless communication system having a receiving unit that outputs reception quality for each path to an upper layer. A wireless communication method for performing wireless communication using a plurality of channels between wireless communication devices and hopping the frequencies of the plurality of channels at a predetermined cycle,
The transmission data from the upper layer is divided into multiple transmission streams,
According to transmission parameters set for each of the plurality of transmission streams, each of the plurality of transmission streams is encoded and modulated,
Each of the modulated plurality of transmission streams is converted into a radio frequency signal that hops subcarriers included in different subband frequencies,
In accordance with transmission parameters set for each of the plurality of transmission streams, control transmission power of the plurality of radio frequency signals,
The transmission parameters set for each of the plurality of transmission streams satisfy a predetermined transmission rate under the reception quality of the subband frequency at which the plurality of transmission streams are transmitted, and A wireless communication method set based on a predetermined standard. In claim 6,
The wireless communication method, wherein the reference is an evaluation function that maximizes a sum of reception qualities necessary for the plurality of transmission streams or an evaluation function that minimizes a sum of transmission powers necessary for the plurality of transmission streams.

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