WO2008038380A1 - Wireless communication apparatus - Google Patents

Abstract

A wireless communication apparatus wherein a simple structure is used to simultaneously operate various types of terminal applications that utilizes radio. The wireless communication apparatus (100) comprises a plurality of antennas (101a,101b,101c,101d); a first receiving part (103) that shares, as a first radio part, the radio processing of a wireless system A and a wireless system B having a higher frequency band than the wireless system A for signals of frequency bands f0-f3 transmitted/received via the plurality of antennas; a second receiving part (104) that shares, as a second radio part, the radio processing of the wireless system B and a wireless system C having a higher frequency band than the wireless system B for signals of frequency bands f2-f5 transmitted/received via the plurality of antennas; and a third receiving part (105) that shares, as a third radio part, the radio processing of the wireless system C and a wireless system D having a higher frequency band than the wireless system C for signals of frequency bands f4-f7 transmitted/received via the plurality of antennas.

Description

 Specification

 Wireless communication device

 Technical field

 TECHNICAL FIELD [0001] The present invention relates to a wireless communication device such as a mobile phone that supports multi-mode and multi-band.

 Background art

 As shown in FIG. 7, this type of wireless communication apparatus 10 includes a transmitter 11, a receiver 12, an antenna sharing unit 13, an antenna 14, and the like.

In FIG. 7, a transmitter 11 converts an audio signal or a data signal that is transmission information into a transmission signal, and outputs the converted transmission signal to the antenna sharing unit 13.

[0004] The antenna sharing unit 13 transmits the transmission signal input from the transmitter 11 through the antenna 14 as a transmission wave of a predetermined frequency band.

On the other hand, the receiver 12 converts a reception signal of a predetermined frequency band received via the antenna 14 and the antenna sharing unit 13 into reception information such as an audio signal and a data signal and outputs the reception information.

 [0006] By the way, in this type of wireless communication apparatus, cellular multiband (Mult band) such as 3GPP specifications, 3GPP-LTE specifications, and G SMZEDGE are becoming standard.

 [0007] In addition, this type of wireless communication device is required to be multi-mode, such as compatible with international roaming.

 [0008] In addition, this type of wireless communication device (mobile terminal) includes various wireless resources such as a wireless LAN (WLAN), Bluetooth (BT), digital television (DTV), GPS, and RF tag. Various terminal applications that use are beginning to be installed.

 [0009] In addition, for this type of wireless communication apparatus, a technique for improving wireless performance using a plurality of wireless circuits such as diversity and MIMO communication has been generally used.

 [0010] Conventionally, a wireless communication device having a configuration capable of receiving signals of different frequency bands in one of the diversity reception systems is known! (See Patent Document 1).

[0011] In such a wireless communication apparatus that supports, for example, WCDMA compressed mode. In this case, it is not necessary to install radio units for different radio systems and frequencies, so that cost reduction can be achieved.

 Patent Document 1: Japanese Patent Laid-Open No. 2005-229539

 Disclosure of the invention

 Problems to be solved by the invention

 [0012] However, the conventional wireless communication device has a multi-band 'multi-mode cellular system, a variable frequency band for simultaneously operating various terminal applications using wireless such as wireless LAN and digital television. Increasing the frequency will require 1 broadband and wide tunable.

 [0013] For this reason, in the conventional wireless communication device, it is difficult to ensure stable communication performance due to an increase in current consumption and deterioration in communication performance due to NF ′ distortion and the like.

 [0014] An object of the present invention is to provide a wireless communication apparatus that can simultaneously operate various terminal applications using wireless communication with a simple configuration.

 Means for solving the problem

 [0015] The wireless communication apparatus of the present invention has a higher frequency band than the first wireless system and the first wireless system for a plurality of antennas and signals transmitted and received via the plurality of antennas. A second wireless system and a frequency that is higher than that of the second wireless system for signals transmitted and received via the plurality of antennas, and a first wireless unit that shares wireless processing of the second wireless system. And a second radio unit that shares radio processing of the third radio system having a high bandwidth.

 The invention's effect

 [0016] According to the present invention, since the radio circuit is shared, it is possible to reduce the size. In addition, multiple different wireless systems and diversity can be operated simultaneously. Furthermore, since the frequency band that can be handled by one radio unit can be narrowed, the basic characteristics are improved even with a small current.

 Brief Description of Drawings

FIG. 1 is a block diagram showing a configuration of a receiver of a radio communication apparatus according to Embodiment 1 of the present invention. FIG. 2 corresponds to each radio system of the radio communication apparatus according to Embodiment 1 of the present invention. Frequency Figure showing numbers

 FIG. 3 is a block diagram showing a configuration example of a receiving unit of the receiver of the wireless communication apparatus according to the first embodiment of the present invention.

 FIG. 4 is a block diagram showing a configuration of a receiver of a wireless communication apparatus according to Embodiment 2 of the present invention. FIG. 5 is a block diagram showing a configuration of a receiver of a wireless communication apparatus according to Embodiment 3 of the present invention. FIG. 6 is a block diagram showing a configuration of a receiver of a radio communication apparatus according to Embodiment 4 of the present invention. FIG. 7 is a block diagram showing a schematic configuration of the radio communication apparatus.

 BEST MODE FOR CARRYING OUT THE INVENTION

[0018] Hereinafter, a radio communication apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings. In each figure, the same reference numerals are given to components having the same configuration or function and corresponding parts, and the description thereof will not be repeated.

[0019] The present invention is characterized in that the corresponding frequency bands of a plurality of radio units overlap, but have different bands, and the overlapping frequency regions can be utilized for diversity communication and MIMO communication. As

[0020] (Embodiment 1)

 FIG. 1 is a block diagram showing the configuration of the receiver of the wireless communication apparatus according to Embodiment 1 of the present invention. FIG. 2 is a diagram showing frequencies corresponding to each radio system of the radio communication apparatus according to Embodiment 1 of the present invention.

As shown in FIG. 1, the receiver 100 of this example includes antennas 101a, 101b, 101c, lOld, an antenna sharing unit 102, a first receiving unit 103, a second receiving unit 104, and a third receiving unit 105. , Signal processor

106 and a control unit 107 are provided.

In FIG. 1, antennas 101a, 101b, 101c, and lOld are connected to antenna sharing section 102 and receive transmission waves in frequency bands corresponding to the antennas.

[0023] The antenna sharing unit 102 is a first receiving unit corresponding to a radio system that operates the received signals of each band received by the antennas 101a, 101b, 101c, and lOld based on the control signal of the control unit 107. 103, selectively output to the second receiving unit 104 and the third receiving unit 105.

Here, as shown in FIG. 2, the first receiving unit 103 uses the wireless system A and the like such as digital television broadcast and cellular communication among the received signals input from the antenna sharing unit 102. And a reception circuit that supports f0 to f3 for receiving signals in the frequency band corresponding to wireless system B.

 [0025] The second receiving unit 104 receives a received signal in a frequency band corresponding to the wireless system B and the wireless system C such as cellular communication and Bluetooth among the received signals input from the antenna sharing unit 102. Yes F2-f5 receiver circuit is provided.

 [0026] Furthermore, the third receiving unit 105 receives a received signal in a frequency band corresponding to the wireless system C and the wireless system D such as Bluetooth and wireless LAN among the received signals input from the antenna sharing unit 102. Yes F4-f7 receiver circuit is provided.

 FIG. 3 shows a configuration example of the receiving circuit of the first receiving unit 103, the second receiving unit 104, and the third receiving unit 105.

 As shown in FIG. 3, the receiving circuits of the receiving units 103, 104, and 105 include an RF filter 110, a low noise amplifier (LNA) 111, a local oscillator 112, a quadrature demodulator 113, and a low pass filter (LP F). 114a, 114b, AD = ^ 1 (ADC) 115a, 115b.

 In FIG. 3, an RF (band) filter 110 passes only a received signal in a frequency band corresponding to a preset wireless system among the received signals input from the antenna sharing unit 102, and the low noise amplifier 111. Output to.

 The low noise amplifier 111 amplifies the received signal in the frequency band corresponding to the preset wireless system input from the RF filter 110 and outputs the amplified signal to the quadrature demodulator 113.

 [0031] The quadrature demodulator 113 performs quadrature demodulation and quadrature demodulation of the signal output from the low noise amplifier 111 based on a predetermined oscillation frequency signal provided from the local oscillator 112 according to the reception frequency. The component signal and Q component signal are output to the low-pass filters 114a and 114b, respectively.

 [0032] The low-pass filters 114a and 114b control the bandwidths of the I component signal and the Q component signal input from the quadrature demodulator 113, and convert the I component signal and the Q component signal of a desired bandwidth to the AD converter 115a, Output to 115b respectively.

[0033] The AD converters 115a and 115b perform AZD conversion on the desired bandwidth I component signal and Q component signal input from the low-pass filters 114a and 114b, and convert the I component signal and Q component signal into digital signals. The signal is output to the signal processing unit 106 (see FIG. 1). Based on the I component signal and the Q component signal input from the AD converters 115 a and 115 b of each receiving circuit and the control signal input from the control unit 107, the signal processing unit 106 receives each receiving unit 103. , 104, 105 Processing to operate the wireless system corresponding to the reception frequency.

 [0035] For example, as described later, the signal processing unit 106 views the DTV in the first receiving unit 103,

2 Perform processing for diversity communication and MIMO operation in the overlapping frequency bands of the receiving unit 104 and the third receiving unit 105.

The control unit 107 controls processing operations of the antenna sharing unit 102 and the signal processing unit 106 in accordance with the radio system operated by the receiver 100 of this example.

[0037] As described above, in the receiver 100 of this example, the corresponding frequency bands of the first receiving unit 103, the second receiving unit 104, and the third receiving unit 105 overlap each other. It is set!

[0038] As described above, the receiver 100 of the present example includes a plurality of receiving units 103, 104, and 105 that have different corresponding frequency bands that are set so that some of the frequency bands overlap each other. Thus, a plurality of wireless systems using different frequency bands can be received simultaneously.

 [0039] For example, in the receiver 100 of this example, the corresponding frequency of the first receiving unit 103 is set to 470 MHz to 2.

 Set to 2 GHz, set the corresponding frequency of the second receiver 104 to 800 MHz to 2.7 GHz, and set the corresponding frequency of the third receiver 105 to 2.6 GHz to 5.4 GHz.

 [0040] Thereby, in the receiver 100 of this example, DTV (470 to 800MHz), 3G (800MHz, 2GHz), WLAN and BT (2.4GHz), 3GLTE (2.6GHz), WLAN (5GHz) Multiple modes or bands can be received simultaneously.

 [0041] Therefore, in receiver 100 of this example, first receiver 103 views DTV, and diversity communication or MIMO operation is performed in the frequency band where second receiver 104 and third receiver 105 overlap. It becomes possible to do. It should be noted that the overlapping band between the receiving units 103, 104, and 105 is preferably a frequency band of about one octave.

[0042] Also, in the receiver 100 of this example, the frequency band supported by one of the receiving units 103, 104, and 105 can be narrowed, so that the current of a radio circuit such as LNA or MIX can be reduced, and NF, distortion The basic performance such as can be optimized, and the current consumption, circuit scale, and wireless characteristics are improved. can do.

 [Embodiment 2]

 FIG. 4 is a block diagram showing the configuration of the receiver of the radio communication apparatus according to Embodiment 2 of the present invention.

 [0044] In a multiband radio device, if an LPF corresponding to an entire radio system having a variable bandwidth of, for example, 10 kHz to 10 MHz is used as the variable bandwidth LPF, the circuit scale and current of the LPF increase.

 Therefore, in the receiver 120 of this example, as shown in FIG. 4, each of the receiving units 103, 104, 1

A plurality of band limiting variable filters having different band variable widths between 05 and the signal processing unit 106

122, 123, 124 are provided, and the band limiting variable filters 122, 123, 124 are switched by the switch units 121, 125.

In FIG. 4, each band limiting variable filter 122, 123, 124 is connected to each receiving unit 103, 10

In accordance with 4, 105 reception modes, for example, an LPF with a bandwidth variable width of 10 kHz to l MHz is used as the bandwidth limiting variable filter 122, and a bandwidth variable width of 100 kHz to 1 is used as the bandwidth limiting variable filters 123, 124. Use a 10MHz LPF.

The switch unit 121 includes each receiving unit 103, 104, 105 and each band limiting variable filter 122, 1

Switch the connection to 23, 124.

[0048] The switch unit 125 includes each band limiting variable filter 122, 123, 124 and a signal processing unit (AD

C) Switch the connection with 106.

Thus, in the receiver 120 of the present example, each band limiting variable filter 122, 123

, 124 can be reduced, and the circuit scale and current are reduced.

[0050] Further, in receiver 120 of this example, since the reception performance deterioration due to the interference wave can be suppressed by the band limitation by each band limitation variable filter 122, 123, 124, the basic characteristics can be stabilized. .

[0051] (Embodiment 3)

 FIG. 5 is a block diagram showing the configuration of the receiver of the wireless communication apparatus according to Embodiment 3 of the present invention.

[0052] As shown in FIG. 5, the receiver 130 of this example is provided in each of the receiving units 103, 104, and 105. Corresponding antennas 131, 132, 133 dedicated to each receiving unit are provided.

In FIG. 5, the antenna 131 is configured to receive only radio waves in the same frequency band as the corresponding frequency band of the first receiving unit 103.

Further, the antenna 132 is configured to receive only a radio wave having the same frequency band as the corresponding frequency band of the second receiving unit 104.

Further, the antenna 133 is configured to receive only a radio wave having the same frequency band as the corresponding frequency band of the third receiving unit 105.

[0056] Thus, the receiver 130 of this example includes the bands of the antennas 131, 132, 133 and the receiving units 1

Since it is configured to match the bands 03, 104, and 105, the number of antennas can be reduced, and radio waves in the optimum band can be received without using a high-band antenna.

[Embodiment 4]

 FIG. 6 is a block diagram showing the configuration of the receiver of the radio communication apparatus according to Embodiment 4 of the present invention.

 As shown in FIG. 6, the receiver 140 of this example includes a plurality of RF filters 141a, 141b, 141c having different passbands between the antenna sharing unit 102 and the receiving units 103, 104, 105. , 141d, and these RF filters 14la, 141b, 141c, 14Id are switched by the RF switch 142.

 [0059] In Fig. 6, the RF switch unit 142 selects which of the RF filters 141a, 141b, 141c, 141d to use according to the wireless system to be operated, and sets the antennas 10la, 101b. , 101c, lOld and the connection between each receiver 103, 104, 105 are switched.

 Thereby, in the receiver 140 of the present example, the RF switch unit 142 switches the connection between the antennas 101a, 101b, 101c, 101d and the receiving units 103, 104, 105, whereby each receiving unit 103 , 104 and 105, the received signal can have high signal quality (jamming wave ratio) optimum for the receiving system.

 [0061] Although the configuration of the receiver has been described in the wireless communication device according to each of the above-described embodiments, the present invention can also be configured in the transmitter in the same manner as the receiver.

[0062] As described above, the radio communication apparatus according to the embodiment of the present invention has frequency bands that overlap each other in each of the receiving units 103, 104, and 105, and has different frequencies depending on each radio system. Configure to receive (send) several bands.

 [0063] In other words, the radio communication apparatus according to the embodiment of the present invention can transmit and receive a plurality of modes or bands at the same time, and the frequency bands corresponding to the plurality of radio systems are different and overlapped. Or, it has multiple radio circuits that can transmit (receive z transmit).

 Therefore, in the wireless communication apparatus according to the embodiment of the present invention, the frequency that can be supported by one wireless unit can be narrowed, so that the current of the wireless circuit such as LNA and MIX can be reduced, and NF, distortion In addition to optimizing basic performance, the current consumption, circuit scale, and wireless characteristics can be improved, and diversity communication and MIMO operation can be performed in overlapping frequency bands.

 Industrial applicability

 The wireless communication apparatus according to the present invention can be miniaturized because it shares a wireless circuit, can simultaneously operate a plurality of different wireless systems and diversity, and can be handled by a single wireless unit. Since the frequency band can be narrowed and the basic characteristics are good even with a small amount of current, it is useful as a wireless communication device such as a mobile phone that supports multi-mode and multi-band.

Claims

The scope of the claims  [1] Multiple antennas,  A first wireless unit that shares wireless processing between a first wireless system and a second wireless system having a frequency band higher than that of the first wireless system for signals transmitted and received via the plurality of antennas;  A second radio unit for sharing radio processing of the second radio system and a third radio system having a frequency band higher than that of the second radio system for signals transmitted and received via the plurality of antennas; ,  A wireless communication apparatus comprising: [2] A plurality of band limiting variable filters having different band variable widths for limiting the frequency bands output by the first and second radio units;  Switching means for switching connection between the first and second radio units and the plurality of band limiting variable filters;  The wireless communication apparatus according to claim 1, further comprising: [3] The plurality of antennas receive radio waves in frequency bands respectively corresponding to the first and second radio units.  The wireless communication device according to claim 1. [4] A plurality of RF filters that limit frequency bands input to the first and second radio units; a switching unit that switches connection between the first and second radio units and the plurality of RF filters;  The wireless communication apparatus according to claim 1, further comprising: