JP2007074155A - Device and method for composite diversity reception - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify the circuit constitution of a device for composite diversity reception. <P>SOLUTION: The device for composite diversity reception includes a main reception section 100 and a sub reception section 101 and is provided with switches 109 and 111 before and behind the sub reception section 101 to bypass a filter 110 of the sub reception section 101. When the filter 110 of the sub reception section 101 is detached, the sub reception section 101 can receive a radio signal of a frequency band that the main reception section 100 receives, and consequently even the receiving device which is different in reception frequency and independent can bear main-sub relation for composite diversity reception. Only when the composite diversity reception is performed, the filter 110 of the reception section 101 is bypassed for the reception section 100, so that the reception section 101 can be used as a sub section for the reception section 100. The circuit constitution is made simpler than before to lower the cost, make the shape compact, and save electric power. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a combined diversity receiving apparatus and a combined diversity receiving method, and relates to a mobile communication terminal apparatus including a multi-system or multi-band, especially a mobile phone, a base station apparatus that performs wireless communication with the mobile communication terminal apparatus, and the like. The present invention relates to a combined diversity receiving apparatus and a combined diversity receiving method suitable for use.

  Conventionally, in wireless communication, it is known that a wireless signal attenuates due to the influence of fading, multipath, or the like while passing through a propagation path. As a technique for suppressing reception quality degradation caused by attenuation of a radio signal due to fading or the like, a synthesis diversity that includes a plurality of reception devices and combines received signals using the reception devices and antenna elements connected to the respective reception devices. A receiving apparatus is known (see, for example, Patent Document 1).

  FIG. 5 is a block diagram showing a schematic configuration of a conventional multi-system combining diversity receiver. The combined diversity receiver shown in this figure includes a main receiver 10 of system 1, a sub receiver 11 of system 1, a baseband processor 20, a main receiver 21 of system 2, and a sub receiver of system 2. 22. The main receiver 10 of the system 1 includes an antenna element 12, a high frequency amplifier circuit (RF amplifier) 13, a filter 14, and a receiver circuit 15. The sub-reception unit 11 of the system 1 includes an antenna element 16, an RF amplifier 17, a filter 18 having the same characteristics as the filter 14 of the main reception unit 10, and a reception circuit 19. Since the main reception unit 21 of the system 2 and the sub reception unit 22 of the system 2 have the same configuration as that of the system 1, description thereof will be omitted.

In the main receiving unit 10 of the system 1, a radio signal captured by the antenna element 12 is amplified by the RF amplifier 13 and then input to the receiving circuit 15 through the filter 14. The receiving circuit 15 performs known signal processing such as demodulation processing and A / D (Analog / Digital) conversion on the input radio signal to convert it into a baseband signal, and inputs the result to the baseband processing unit 20. . The sub-reception unit 11 of the system 1 performs the same reception process as that of the main reception unit 10. That is, a radio signal captured by the antenna element 16 is amplified by the RF amplifier 17 and then input to the receiving circuit 19 through the filter 18. The receiving circuit 19 performs known signal processing such as demodulation processing and A / D conversion on the input radio signal to convert it into a baseband signal, and inputs the result to the baseband processing unit 20. The baseband processing unit 20 performs known diversity combining processing such as maximum ratio combining on the baseband signals input from the main receiving unit 10 and the sub receiving unit 11 of the system 1 to improve the quality of the received signal. The main receiver 21 and the sub receiver 22 of the system 2 perform the same processing as that of the main receiver 10 and the sub receiver 11 of the system 1.
JP 2000-286770 A

  However, in the conventional combined diversity receiver, two or more of the main receiver and the sub receiver are required for each system, so the number of parts increases and the cost increases accordingly. There is a problem that the size of the device increases and the power consumption increases.

  The present invention has been made in view of this point, and an object thereof is to provide a combined diversity receiving apparatus and a combined diversity receiving method capable of simplifying the circuit configuration.

(1) The receiving apparatus includes an antenna element, filter means for filtering a radio signal captured by the antenna element, and demodulation processing and analog / digital conversion processing for the radio signal filtered by the filter means. A configuration is provided that includes a receiving unit that performs signal processing to convert the signal into a baseband signal, and a bypass unit that bypasses between the input and output ends of the filter unit.

  According to this configuration, for example, two reception devices are prepared, one is main, the other is sub, and the sub filter unit is bypassed, so that the radio signal in the frequency band received by the main reception device can be received by the sub reception. It is possible to receive even by a device, and it is possible to create a main-sub relationship for allowing combined diversity reception even by independent receiving devices having different reception frequencies. Note that in a conventional multi-system consisting of a plurality of sets of main and sub receivers as one set, the main receiver and sub receiver are prepared for each system, so the number of parts increases accordingly. However, in the present invention, it is not necessary to prepare a sub-receiving device, and only the main receiving device may be used, and only when the combined diversity reception is performed, by simply bypassing the filter means of the receiving device, The device can be used as a sub. Therefore, since the circuit configuration can be simplified as compared with the conventional case, the cost can be reduced, the shape can be reduced, and the power can be saved.

(2) The receiving apparatus according to (1), further including an amplifying unit that amplifies a radio signal captured by the antenna element, wherein the bypass unit is connected to a series connection circuit of the amplifying unit and the filter unit. Use a configuration that bypasses the output terminals.

  According to this configuration, in the receiving apparatus including an amplifying unit that amplifies the radio signal captured by the antenna element, not only the filter but also the amplifying unit is bypassed, thereby eliminating the influence of the frequency characteristics and distortion characteristics of the amplifying unit. be able to.

(3) A combining diversity receiving apparatus, at least two receiving apparatuses according to (1) or (2) above, and a baseband processing apparatus that performs diversity combining processing on baseband signals from each of the at least two receiving apparatuses. , And by using one of the at least two receiving devices as a main and at least one of the remaining receiving devices as a sub, and operating the bypass means of the receiving device as a sub, the main receiving device To receive a radio signal of the same frequency.

  According to this configuration, it is possible to simplify the circuit configuration by providing the receiving device that can bypass the filter means or the amplifying means, thereby reducing the cost, reducing the size, and saving power.

(4) In a combining diversity receiving method in which a plurality of receiving apparatuses that receive radio signals in different frequency bands are used, and a diversity combining process is performed on a baseband signal output from these receiving apparatuses, the plurality of receptions At least two devices as one set, one receiving device of each set as a main, and at least one remaining device as a sub, bypassing between the input and output ends of the filter in the sub receiving device, becomes a main A radio signal having the same frequency as that of the receiving device is received.

  According to this method, it is not necessary to prepare a sub-receiving device, and only the main receiving device may be used. By only bypassing the filter of the receiving device when performing composite diversity reception, It can be used as a receiving device. Therefore, when realizing a combined diversity receiving apparatus, the circuit configuration is simplified, so that cost reduction, size reduction, and power saving can be achieved.

(5) In a combining diversity receiving method in which a plurality of receiving apparatuses that receive radio signals in different frequency bands are used and a diversity combining process is performed on a baseband signal output from these receiving apparatuses, At least two devices as one set, each receiving device of each set as a main, and at least one remaining as a sub, between the input and output terminals of the series connection circuit of the amplifier circuit and the filter in the sub receiving device Bypassing, a radio signal having the same frequency as that of the main receiving apparatus is received.

  According to this method, it is not necessary to prepare a sub-receiving device, and only the main receiving device may be used. By only bypassing the amplifying circuit and the filter of the receiving device when performing composite diversity reception, the reception can be performed. The device can be used as a sub-receiving device. Therefore, when realizing a combined diversity receiving apparatus, the circuit configuration is simplified, so that cost reduction, size reduction, and power saving can be achieved. Furthermore, since the amplifier circuit is also bypassed, the influence of the frequency characteristics and distortion characteristics of the amplifier circuit can be eliminated.

  ADVANTAGE OF THE INVENTION According to this invention, the circuit structure in a synthetic | combination diversity receiver can be simplified, and cost reduction, size reduction, and power saving can be achieved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a block diagram showing a schematic configuration of a combined diversity receiver according to Embodiment 1 of the present invention. In this figure, the combined diversity receiver of this embodiment is a multi-system including a main receiver and a sub-receiver as a set, particularly a mobile phone or a wireless LAN mobile terminal device. The mobile communication terminal apparatus of the present invention or a base station apparatus that communicates with such a mobile communication terminal apparatus can be used as a receiving unit (receiving apparatus) 100 of the system 1A and a receiving unit (receiving apparatus of the system 2A). ) 101 and a baseband processing unit (baseband processing apparatus) 102.

  The receiving unit 100 of the system 1A includes an antenna element 103, an RF amplifier 104, a filter 105, and a receiving circuit 106. The receiving unit 101 of the system 2A includes an antenna element 107, an RF amplifier 108, a filter 110, a receiving circuit 112, and switches 109 and 111. Since the receiving unit 100 of the system 1A and the receiving unit 101 of the system 2A receive radio signals in different frequency bands, the frequency characteristics of the filter 105 and the filter 110 are different. In the present embodiment, for simplicity of explanation, the number of synthesis is set to “2”, which is the minimum configuration, and components such as an amplifier and a filter that are not directly related to the present invention are omitted. Further, the order of the RF amplifier and the filter in this embodiment is a reference example and may be different.

  In the receiving unit 100 of the system 1A, the radio signal captured by the antenna element 103 is amplified by the RF amplifier 104, filtered by the filter 105, and input to the receiving circuit 106. In the receiving circuit 106, the filtered radio signal is subjected to known signal processing such as demodulation processing and A / D conversion to be converted into a baseband signal and input to the baseband processing unit 102. On the other hand, in the reception unit 101 of the system 2A, the radio signal captured by the antenna element 107 is amplified by the RF amplifier 108, and then directly input to the reception circuit 112, bypassing the filter 110 by the switches 109 and 111. In the receiving circuit 112, the input radio signal is subjected to known signal processing such as demodulation processing and A / D conversion to be converted into a baseband signal and input to the baseband processing unit 102. The baseband processing unit 102 synthesizes the baseband signals input from the receiving unit 100 of the system 1 and the receiving unit 101 of the system 2 by performing a known diversity combining process such as maximum ratio combining, and the received signal quality is improved. increase.

  On the other hand, when the radio signal is received by the system 2A, the switches 109 and 111 of the receiving unit 101 are set so as not to bypass the filter 110, and a reception operation with the filter 110 interposed is performed.

  As described above, according to the combining diversity receiving apparatus of the present embodiment, the sub-reception unit is not required to perform combining diversity in the system 1A, the filter 110 of the receiving unit 101 in the system 2A is bypassed, and the system 1A By receiving the same radio signal as the reception unit 100 receives, it is used as a sub-reception unit of the system 1A, so that the circuit configuration can be simplified and the cost can be reduced while maintaining the reception performance by the diversity combining process. The shape can be reduced in size and power can be saved.

  In addition, a switch that bypasses the filter unit 105 of the system 1A is provided in the reception unit 100 of the system 1A, and when the radio signal is received by the system 2A, the reception unit 100 of the system 1A is used as a sub-reception unit of the system 2A. You may make it perform reception.

(Embodiment 2)
FIG. 2 is a block diagram showing a schematic configuration of the combined diversity receiver according to Embodiment 2 of the present invention. In this figure, the combined diversity receiving apparatus of the present embodiment is provided with a plurality of sets, each of which includes a main receiving section and a sub receiving section thereof, similarly to the above-described combined diversity receiving apparatus of the first embodiment. The present invention is applicable to a multi-system, particularly a mobile communication terminal device such as a mobile phone or a mobile terminal device for wireless LAN, or a base station device that communicates with such a mobile communication terminal device. 1 is different from the combining diversity receiving apparatus of Embodiment 1 in that the combining diversity receiving apparatus of Embodiment 1 bypasses only the filter 110 of the receiving unit 101, whereas the combining diversity receiving apparatus of the present embodiment is different from the RF of the receiving unit 201. This is a point where the amplifier 108 and the filter 110 are bypassed.

  That is, in the combined diversity receiver of this embodiment, in the receiving unit 201 of the system 2A, the switch 109 is interposed between the antenna element 107 and the RF amplifier 108, and the movable contact c of the switch 109 is a fixed contact. By switching to b, and simultaneously switching the movable contact c of the switch 111 to the fixed contact b, the RF amplifier 108 and the filter 110 are bypassed. At the same time, the movable contact c of the switch 111 is switched to the fixed contact b. The filter 105 of the system 1A and the filter 110 of the system 2A have different frequency characteristics as described in the first embodiment. In addition to the filter, the RF amplifier also has different frequency characteristics between the system 1A and the system 2A. In the present embodiment, the RF amplifier 108 is bypassed together with the filter 110 in the system 2A in order to eliminate the influence of the frequency characteristics and distortion characteristics of the RF amplifier.

  Also in this embodiment, for the sake of simplification of description, the number of synthesis is set to “2” of the minimum configuration, and components such as an amplifier and a filter that are not directly related to the present invention are omitted. Further, the order of the RF amplifier and the filter of this embodiment is a reference example and may be different from the present invention.

  In such a configuration, the reception unit 100 of the system 1A operates in the same manner as in the first embodiment at the time of reception of combined diversity. That is, a radio signal captured by the antenna element 103 is amplified by the RF amplifier 104 and then input to the receiving circuit 106 via the filter 105. In the receiving circuit 106, the input radio signal is subjected to known signal processing such as demodulation processing and A / D conversion to be converted into a baseband signal and input to the baseband processing unit 102. On the other hand, in the receiving unit 201 of the system 2A, the movable contact c of the switch 109 is switched to the fixed contact b, and the movable contact c of the switch 111 is switched to the fixed contact b, so that the RF amplifier 108 and the filter 110 are bypassed and the antenna element 107 is bypassed. Are directly connected to the receiving circuit 112. As a result, the radio signal captured by the antenna element 107, that is, the same radio signal received by the receiving unit 100 of the system 1A, is input to the receiving circuit 112 without passing through the RF amplifier 108 and the filter 110. In the reception circuit 112, the radio signal captured by the antenna element 107 is converted into a baseband signal and input to the baseband processing unit 102. The baseband processing unit 102 synthesizes the baseband signal input from the receiving unit 100 of the system 1A and the baseband signal input from the receiving unit 210 of the system 2A by performing known diversity combining processing such as maximum ratio combining. , Improve the quality of the received signal.

  On the other hand, when the system 2A is used alone, the movable contact c of the switch 109 is switched to the fixed contact a, the movable contact c of the switch 111 is switched to the fixed contact a, and the RF amplifier 108 and the filter 110 receive the antenna element 107. It is inserted between the circuit 112. As a result, the radio signal captured by the antenna element 107 is amplified by the RF amplifier 108 and then input to the receiving circuit 112 via the filter 110. In the receiving circuit 112, the input radio signal is subjected to known signal processing such as demodulation processing and A / D conversion to be converted into a baseband signal and input to the baseband processing unit 102. As described above, when the system 2A is used alone, the reception unit 201 of the system 2A performs a reception operation without bypassing the RF amplifier 108 and the filter 110.

  As described above, according to the combining diversity receiving apparatus of the present embodiment, no sub receiving means is required to perform combining diversity in the system 1A, and the RF amplifier 108 and the filter 110 of the receiving unit 201 of the system 2A are bypassed. By receiving the same radio signal as the reception unit 100 of the system 1A receives, it is used as a sub-reception unit of the system 1A, so that the circuit configuration can be simplified while maintaining the reception performance by the diversity combining process. It is possible to reduce the cost, reduce the shape, and save power. In particular, while only the filter 110 is bypassed in the first embodiment described above, the RF amplifier 108 is also bypassed in the present embodiment, so that the influence of the frequency characteristics and distortion characteristics of the RF amplifier 108 can be eliminated. In addition, further power saving can be achieved.

  In addition, a switch that bypasses the RF amplifier 104 and the filter 105 is provided in the receiving unit 100 of the system 1A, and when the radio signal is received by the system 2A, the receiving unit 100 of the system 1A is used as a sub-receiving unit of the system 2A, thereby combining diversity. You may make it perform reception.

(Embodiment 3)
FIG. 3 is a block diagram showing a schematic configuration of the combined diversity receiving apparatus according to Embodiment 3 of the present invention. In this figure, the combined diversity receiver according to the present embodiment can be incorporated into a multiband receiver capable of receiving a plurality of frequency bands (bands), and includes a band (B1) receiver 300, A band (B2) reception unit 301 having a reception frequency band different from the reception frequency band of the band (B1) reception unit 300 and a baseband processing unit 302 are configured. The band (B1) receiving unit 300 includes an antenna element 303, an RF amplifier 304, a filter 305, and a receiving circuit 306. The band (B2) reception unit 301 includes an antenna element 307, an RF amplifier 308, a filter 310, a reception circuit 312, and switches 309 and 311. Since the band (B1) receiving unit 300 and the band (B2) receiving unit 301 receive radio signals in different frequency bands, the frequency characteristics of the filter 305 and the filter 310 are different. In the present embodiment, for simplicity of explanation, the number of synthesis is set to “2”, which is the minimum configuration, and components such as an amplifier and a filter that are not directly related to the present invention are omitted. Further, the order of the RF amplifier and the filter in this embodiment is a reference example and may be different.

  In the band (B1) receiving unit 300, the radio signal captured by the antenna element 303 is amplified by the RF amplifier 304 and then input to the receiving circuit 306 through the filter 305. In the receiving circuit 306, the input radio signal is subjected to known signal processing such as demodulation processing and A / D conversion to be converted into a baseband signal, and input to the baseband processing unit 302. On the other hand, in the band (B2) reception unit 301, the radio signal captured by the antenna element 307 is amplified by the RF amplifier 308, and then directly input to the reception circuit 312 by bypassing the filter 310 by the switches 309 and 311. In the reception circuit 312, the input radio signal is subjected to known signal processing such as demodulation processing and A / D conversion to be converted into a baseband signal and input to the baseband processing unit 302. The baseband processing unit 302 synthesizes a baseband signal input from each of the band (B1) receiving unit 300 and the band (B2) receiving unit 301 by performing a known diversity combining process such as maximum ratio combining and the like. Increase quality.

  When the band (B2) receiving unit 301 receives a radio signal, the switches 309 and 311 of the band (B2) receiving unit 301 are set not to bypass the filter 310 and perform a receiving operation with the filter 310 interposed.

  As described above, according to the combining diversity receiving apparatus of the present embodiment, the band (B1) receiving unit 300 does not need a sub receiving unit to perform combining diversity, and the band (B2) receiving unit 301 includes the filter 310. By bypassing and receiving the same radio signal as received by the band (B1) receiving unit 300, it is used as a sub-reception means of the band (B1) receiving unit 300, so that the reception performance by the diversity combining process is maintained. However, the circuit configuration can be simplified, and the cost can be reduced, the shape can be reduced, and the power can be saved.

  Note that a switch that bypasses the filter 305 is provided in the band (B1) reception unit 300 so that the band (B1) reception unit 300 is connected to the subband of the band (B2) reception unit 301 when the band (B2) reception unit 301 receives a radio signal. It may be used as a receiving device to perform combined diversity reception.

(Embodiment 4)
FIG. 4 is a block diagram showing a schematic configuration of a combined diversity receiving apparatus according to Embodiment 4 of the present invention. In this figure, the combined diversity receiving apparatus of the present embodiment can be incorporated into a multiband receiver that can receive a plurality of frequency bands (bands), similarly to the combined diversity receiving apparatus of the third embodiment described above. Is.

  In the combined diversity receiving apparatus of the present embodiment, the band (B2) receiving unit 401 bypasses the RF amplifier 308 and the filter 310 so that the antenna element 307 can be directly connected to the receiving circuit 312. This is different from the combined diversity receiver according to the embodiment. That is, in the combined diversity receiving apparatus according to the present embodiment, in band (B2) receiving section 401, switch 309 is interposed between antenna element 307 and RF amplifier 308, and movable contact c of switch 309 is provided. By switching to the fixed contact b, the RF amplifier 308 and the filter 310 are bypassed. At the same time, the movable contact c of the switch 311 is switched to the fixed contact b. The band (B1) receiving unit 300 and the band (B2) receiving unit 401 have different frequency characteristics as described in the third embodiment. In addition to the filter, the frequency characteristics of the RF amplifier differ between the band (B1) receiving unit 300 and the band (B2) receiving unit 401. In this embodiment, in order to eliminate the influence of the frequency characteristics and distortion characteristics of the RF amplifier, the RF amplifier 308 is also bypassed together with the filter 310 in the band (B2) reception unit 401.

  Also in this embodiment, for the sake of simplification of description, the number of synthesis is set to “2” of the minimum configuration, and components such as an amplifier and a filter that are not directly related to the present invention are omitted. Further, the order of the RF amplifier and the filter of this embodiment is a reference example and may be different from the present invention.

  In such a configuration, the band (B1) receiving unit 300 operates in the same manner as in the third embodiment at the time of reception of combined diversity. That is, a radio signal captured by the antenna element 303 is amplified by the RF amplifier 304 and then input to the receiving circuit 306 via the filter 305. In the receiving circuit 306, the input radio signal is subjected to known signal processing such as demodulation processing and A / D conversion to be converted into a baseband signal, and input to the baseband processing unit 302. On the other hand, in the band (B2) receiving unit 401, the movable contact c of the switch 309 is switched to the fixed contact b, and the movable contact c of the switch 311 is switched to the fixed contact b, so that the RF amplifier 308 and the filter 310 are bypassed and the antenna element. 307 is directly connected to the receiving circuit 312. As a result, the wireless signal captured by the antenna element 307, that is, the same wireless signal received by the band (B1) receiving unit 300, is input to the receiving circuit 312 without passing through the RF amplifier 308 and the filter 310. In the reception circuit 312, the radio signal captured by the antenna element 307 is converted into a baseband signal and input to the baseband processing unit 302. The baseband processing unit 302 performs known diversity combining processing such as maximum ratio combining on the baseband signal input from the band (B1) receiving unit 300 and the baseband signal input from the band (B2) receiving unit 401. Synthesize and improve the quality of the received signal.

  On the other hand, when the band (B2) receiving unit 401 is used alone, the movable contact c of the switch 309 is switched to the fixed contact a, and the movable contact c of the switch 311 is switched to the fixed contact a. 310 is inserted between the antenna element 307 and the receiving circuit 312. As a result, the radio signal captured by the antenna element 307 is amplified by the RF amplifier 308 and then input to the receiving circuit 312 via the filter 310. In the reception circuit 312, the input radio signal is subjected to known signal processing such as demodulation processing and A / D conversion to be converted into a baseband signal and input to the baseband processing unit 302. As described above, when the band (B2) receiving unit 401 is used alone, the band (B2) receiving unit 401 performs a receiving operation without bypassing the RF amplifier 308 and the filter 310.

  As described above, according to the combining diversity receiver of the present embodiment, the sub-receiving means is not required to perform combining diversity in the band (B1) receiving unit 300, and the RF amplifier 308 of the band (B2) receiving unit 401. And by bypassing the filter 310 and receiving the same radio signal as the band (B1) receiving unit 300 receives, it is used as a sub-reception means of the band (B1) receiving unit 300. The circuit configuration can be simplified while maintaining the performance, and the cost can be reduced, the shape can be reduced, and the power can be saved. In particular, while only the filter 310 is bypassed in the third embodiment described above, the RF amplifier 308 is also bypassed in this embodiment, so that the influence of the frequency characteristics and distortion characteristics of the RF amplifier 308 can be eliminated. In addition, further power saving can be achieved.

  The band (B1) receiving unit 300 is provided with a switch that bypasses the RF amplifier 304 and the filter 305, and the band (B1) receiving unit 300 is switched to the band (B2) receiving unit when the band (B2) receiving unit 401 receives a radio signal. 401 may be used as a sub-reception unit 401 to perform combined diversity reception.

  The present invention is suitable for application to a multisystem or multiband receiver.

The block diagram which shows schematic structure of the synthetic | combination diversity receiver which concerns on Embodiment 1 of this invention. FIG. 3 is a block diagram showing a schematic configuration of a combined diversity receiver according to Embodiment 2 of the present invention. FIG. 3 is a block diagram showing a schematic configuration of a combined diversity receiver according to Embodiment 3 of the present invention. FIG. 7 is a block diagram showing a schematic configuration of a combined diversity receiver according to Embodiment 4 of the present invention. The block diagram which shows schematic structure of the conventional synthetic | combination diversity receiver.

Explanation of symbols

100 Receiving unit of system 1A 101 Receiving unit of system 2A 102, 302 Baseband processing unit 103, 107, 303, 307 Antenna element 104, 108, 304, 308 RF amplifier 105, 110, 305, 310 Filter 106, 112, 306 , 312 receiving circuit 109, 111, 309, 311 switch 300 band (B1) receiving unit 301, 401 band (B2) receiving unit

Claims (5)

An antenna element;
Filter means for filtering a radio signal captured by the antenna element;
Receiving means for performing signal processing including demodulation processing and analog / digital conversion processing on the radio signal filtered by the filter means, and converting the radio signal into a baseband signal;
Bypass means for bypassing between the input and output ends of the filter means;
A receiving apparatus comprising: Amplifying means for amplifying a radio signal captured by the antenna element,
The receiving device according to claim 1, wherein the bypass unit bypasses an input / output terminal of a series connection circuit of the amplification unit and the filter unit. At least two receiving devices according to claim 1 or 2, and
A baseband processing device that performs diversity combining processing on baseband signals from at least two of the receiving devices,
A radio signal having the same frequency as that of the main receiving apparatus by operating the bypass means of the receiving apparatus serving as a sub, with one of at least two receiving apparatuses serving as a main and at least one remaining as a sub. Is a combined diversity receiver. In a combining diversity receiving method that uses a plurality of receiving devices that receive radio signals in frequency bands different from each other, and performs diversity combining processing on baseband signals output from these receiving devices,
By using at least two receivers as one set, one receiver of each set as a main, and at least one remaining as a sub, bypassing between the input and output ends of the filter in the sub receiver A combined diversity reception method for receiving a radio signal having the same frequency as that of the main receiving apparatus. In a combining diversity receiving method that uses a plurality of receiving devices that receive radio signals in frequency bands different from each other, and performs diversity combining processing on baseband signals output from these receiving devices,
A plurality of the receiving devices are set as a pair, one receiving device of each set is a main, and the remaining at least one is a sub, and an input of a series connection circuit of an amplifier circuit and a filter in the sub receiving device is set. A combined diversity reception method for bypassing between output terminals and receiving a radio signal having the same frequency as that of the main receiving apparatus.

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