JP2008172808A - Signal processing module, wireless apparatus utilizing the same, and radio base station - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten a cable length by decreasing the number of cables required for calibration processing. <P>SOLUTION: An antenna terminal 24 connects an antenna. A coupler 26 branches a signal line to be used for calibration processing from a signal line for transmitting/receiving RF signals of data communication. The couplers 26 are connected by an inter-coupler calibration cable 206. An antenna side switch 28 switches the signal line to be used in accordance with transmission and reception together with a signal processor side switch 34. A PA 30 amplifies an RF signal to be transmitted. An LNA 32 amplifies a received RF signal. A signal processor terminal 36 connects a signal processor. A downlink signal calibration terminal 40 connects the signal processor for calibration processing. An uplink signal calibration terminal 38 connects a terminator. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a signal processing module, a radio apparatus using the same, and a radio base station. In particular, the present invention relates to a radio apparatus and an apparatus for adjusting a transmission / reception system in a radio base station.

  In wireless communication, adaptive array technology has been studied in order to effectively use frequency resources and improve communication quality. The adaptive array includes adaptive beamforming and adaptive null steering, and adaptive beamforming is a technique for transmitting to a wireless device to be communicated with the maximum transmission power. Adaptive null steering is a wireless device that is not a communication target. This is a technique for preventing interference. A radio apparatus having adaptive array technology generally receives signals with a plurality of antennas, and in order to perform adaptive beamforming, the amplitude and phase of a transmission signal so as to obtain the maximum transmission power for the radio apparatus to be communicated with. To control. On the other hand, in order to perform adaptive null steering, the amplitude and phase of a signal are controlled so as not to receive interference from a wireless device that is not a communication target.

In a wireless device having a plurality of antennas, if there is non-uniformity in the characteristics of the transmission system and reception system hardware corresponding to each antenna, the amplitude of the radio frequency (RF) signal transmitted from each antenna The phase is different from the desired one. For this reason, in an adaptive array with multiple antennas, the amplitude and phase of the signal are controlled by adaptive beamforming and adaptive beam steering. (For example, refer to Patent Document 1). In addition, since the hardware characteristics are also affected by temperature, it is necessary to detect and adjust the difference in hardware characteristics between the transmission system and the reception system in each antenna according to the temperature change.
JP 2001-53661 A

  Under such circumstances, the present inventor has come to recognize the following problems. In order to increase the coverage area of the radio base station apparatus, it is desirable to install the antenna of the radio base station apparatus at a high place such as a steel tower. At that time, considering the maintenance of the radio base station apparatus, it is desirable that the radio base station apparatus itself be installed in a low place such as a building that can be operated by the maintenance manager. That is, it is suitable to install the radio base station apparatus separately from the radio signal processing module including an antenna and a transmission amplifier. On the other hand, in order to optimize the characteristics of the adaptive array provided in the radio base station apparatus, it is better to execute the calibration process even during the period in which the radio base station apparatus communicates with the radio terminal apparatus.

  However, in a form in which the radio signal processing module and the radio base station device are separated, in order to execute the calibration process during the communication processing period, a signal transmission cable is provided between the radio signal processing module and the radio base station device. It is necessary to connect with two types of cables: calibration cable. Further, as the number of antennas increases, the number of cables also increases, and the cable installation work and the cost of the cables increase.

  The present inventor has recognized this situation and made the present invention, and an object of the present invention is to provide a signal processing module having a plurality of antennas, a radio apparatus and a radio base station using the signal processing module. It is another object of the present invention to provide a signal processing module having a calibration processing function, a radio apparatus and a radio base station using the signal processing module. It is another object of the present invention to provide a signal processing module in which the number of calibration cables is reduced, and a radio apparatus and a radio base station using the signal processing module.

  One embodiment of the present invention is a signal processing module. The signal processing module includes a signal processing terminal group including a plurality of signal processing terminals for connecting a plurality of signal terminals provided in a transmission / reception apparatus for signal transmission / reception processing, and a plurality of antennas, respectively. An antenna terminal group including a plurality of antenna terminals for connection, an amplifier group including a plurality of amplifiers provided between the plurality of signal processing terminals and the plurality of antenna terminals, and a plurality of antenna terminals And a plurality of couplers each provided between the plurality of amplifiers, a first calibration cable for connecting the plurality of couplers in series, one of the connected couplers, and calibration Including a second calibration cable for connecting a calibration processing device for performing signal processing for the purpose of .

  The first calibration cable may be configured with a cable that is thinner than the second calibration cable. The second calibration cable may be connected to a coupler closest to the calibration processing device among the plurality of couplers.

  With the above apparatus, the first calibration cable can be made shorter than the second calibration cable, and the number of connection terminals of the second calibration cable in the signal processing module can be reduced.

  Another aspect of the present invention is a wireless device. This apparatus is provided between a plurality of amplifiers and a plurality of antennas, a transmission / reception unit that performs signal transmission / reception processing, an amplifier group that includes a plurality of amplifiers connected to a plurality of signal terminals provided in the transmission / reception unit, respectively. A coupler group consisting of a plurality of couplers, a first calibration cable for connecting the plurality of couplers in series, a second calibration cable for connecting one end to one of the connected couplers, A calibration processing unit that is connected to the other end of the second calibration cable and performs signal processing for calibration.

  The calibration processing unit may include a variable attenuation unit that attenuates the power of the signal for calibration according to the length of the connected second calibration cable.

  With the above apparatus, the power of the signal input for calibration processing can be adjusted according to the second calibration cable length, so that the dynamic range of input power for the calibration processing signal can be reduced.

  Yet another embodiment of the present invention is a radio base station. The radio base station includes a transmission / reception unit that performs signal transmission / reception processing, an amplifier group including a plurality of amplifiers connected to a plurality of signal terminals provided in the transmission / reception unit, a plurality of amplifiers, and a plurality of antennas, respectively. A coupler group including a plurality of couplers, a first calibration cable for connecting a plurality of couplers in series, and a second calibration for connecting one end to one of the connected couplers. And a calibration processing unit connected to the other end of the second calibration cable and performing signal processing for calibration.

  It should be noted that any combination of the above-described constituent elements and a conversion of the expression of the present invention between a method, an apparatus, a system, a recording medium, a computer program, etc. are also effective as an aspect of the present invention.

  According to the present invention, the number of cables connecting the coupler and the calibration device can be reduced, and the cable length necessary for the calibration process can be reduced.

  In this embodiment, signal processing includes an amplifier provided corresponding to a plurality of antennas, an RF module including the plurality of antennas, and a transmission / reception unit that can simultaneously process signals from a plurality of carriers having different frequencies. The present invention relates to a base station apparatus in which apparatuses are separately provided. The RF module performs signal processing so that the base station device performs communication processing for a terminal device to be communicated at a predetermined frequency, and simultaneously performs calibration processing for a transmitter / receiver and an amplifier included therein at a different frequency. In addition to being connected to a signal transmission / reception unit in the apparatus by a signal transmission cable, it is connected to a calibration processing unit in the signal processing apparatus by a calibration cable.

  The calibration cable originally requires several antennas, but in this embodiment, after the couplers connected to each of the plurality of antennas are connected in series by the first calibration cable, A coupler connected to one antenna and a calibration processing unit in the signal processing device are connected by a second calibration cable. With the above configuration, the number of calibration cables between the RF module and the signal processing device can be reduced. Furthermore, if the RF module is installed at a high place away from the signal processing device, and the distance between the antennas is designed to be limited to the size of the RF module, the length of the first calibration cable is the second calibration cable. The cable length can be shorter than the cable length, and the total cable length can be reduced. In addition, since the number of calibration cable connection terminals of the RF module can be reduced, the connection process of the RF module can be simplified.

  FIG. 1 shows the configuration of base station apparatus 100 according to the present embodiment. The base station apparatus 100 includes an eleventh antenna 10aa, a twelfth antenna 10ab, a thirteenth antenna 10ac, a twenty-first antenna 10ba, a twenty-second antenna 10bb, a twenty-third antenna 10bc, a first N1 antenna 10na, and a second N2 antenna 10nb. , An N3 antenna 10nc, a first RF module 12a, a second RF module 12b, an NRF module 12n, and a signal processing device 14 collectively referred to as an RF module 12. The signal processing device 14 includes a transmission / reception unit 18, a calibration processing unit 20, A control unit 22 is included. In addition, the first RF signal line 200a, the second RF signal line 200b, the NRF signal line 200n, which are collectively referred to as the RF signal line 200, and the first inter-module calibration cable 202a, which are collectively referred to as the inter-module calibration cable 202, are used as signal lines. , A second inter-module calibration cable 202b, an N-th inter-module calibration cable 202n, and a GPP message line 204.

  The antenna 10 connects a plurality of terminal devices not shown by a predetermined RF. Here, the number of antennas 10 is 3 × N, and is not limited to either an omnidirectional antenna or a directional antenna.

  The RF module 12 amplifies the RF signal to be transmitted input by the RF signal line 200 and outputs the amplified signal to the antenna 10, and amplifies the RF signal received by the antenna 10 and outputs it by the RF signal line 200. Further, signals necessary for the calibration process are input / output from the inter-module calibration cable 202. Here, it is assumed that one RF module 12 connects three antennas 10, and accordingly, one RF signal line 200 is constituted by three cables.

  The transmission / reception unit 18 executes frequency conversion processing, digital-analog conversion processing, modulation / demodulation processing, and the like necessary for transmission / reception processing. Further, it has a predetermined interface and is connected to the network 16.

  The calibration processing unit 20 executes processing for transmitting and receiving signals necessary for calibration processing. The calibration processing unit 20 is connected to the RF module 12 by an inter-module calibration cable 202 and connected to the transmission / reception unit 18 by a GPP message line 204.

  The control unit 22 is connected to the transmission / reception unit 18 and the calibration processing unit 20 through a signal line (not shown), and controls timing and the like in data communication processing and calibration processing in the signal processing device 14.

  This configuration can be realized in terms of hardware by a CPU, memory, or other LSI of an arbitrary computer, and in terms of software, it is realized by a program having a reservation management function loaded in memory. The functional block realized by those cooperation is drawn. Accordingly, those skilled in the art will understand that these functional blocks can be realized in various forms by hardware only, software only, or a combination thereof.

  FIG. 2 shows a configuration of the first RF module 12a. The first RF module 12a includes a first antenna terminal 24a, a second antenna terminal 24b, a third antenna terminal 24c, collectively referred to as an antenna terminal 24, a first coupler 26a, a second coupler 26b, and a first coupler 26b. 3 coupler 26c, first antenna side switch 28a, collectively referred to as antenna side switch 28, second antenna side switch 28b, third antenna side switch 28c, first PA 30a, second PA 30b, third PA 30c, collectively referred to as PA (Power Amplifier) 30 First LNA 32a, second LNA 32b, third LNA 32c, collectively referred to as LNA (Low Noise Amplifier) 32, first signal processor-side switch 34a, second signal processor-side switch 34b, third signal processing, collectively referred to as signal processor-side switch 34 Device side Switch 34c, signal processing device terminal 36, first signal processing device terminal 36a, second signal processing device terminal 36b, third signal processing device terminal 36c, upstream signal calibration terminal 38, downstream signal calibration A terminal 40 is included.

  The signal line includes a first inter-coupler calibration cable 206a and a second inter-coupler calibration cable 206b, which are collectively referred to as an inter-coupler calibration cable 206.

  The antenna terminal 24 is an interface for connecting the antenna 10 of FIG. The shape and characteristics of the interface are designed according to the antenna 10. The coupler 26 is formed by an antenna terminal 24 and a signal processing device terminal 36 described later, and branches a signal line for use in calibration processing from a signal line for transmitting an RF signal for data communication. The couplers 26 are connected by an inter-coupler calibration cable 206. The coupler 26 outputs the signal input from the signal processing device terminal 36 to the downlink signal calibration terminal 40 when executing the downlink calibration process, and executes the downlink calibration process when executing the uplink calibration process. The signal input from the signal calibration terminal 40 is output to the signal processing device terminal 36. For the purpose of downsizing the first RF module 12a, a cable thinner than the inter-module calibration cable 202 may be used for the inter-coupler calibration cable 206.

  The antenna-side switch 28 switches the signal line to be used according to transmission and reception with the signal processing device-side switch 34, uses a PA 30 described later for transmission, and uses an LNA 32 described later for reception. To work. A signal for switching is supplied from the control unit 22 of FIG.

  The PA 30 amplifies the RF signal to be transmitted. The LNA 32 amplifies the received RF signal.

  The signal processing device terminal 36 is an interface for connecting the transmission / reception unit 18 of FIG. Each of the signal processing device terminals 36 is connected to a first RF signal line 200a constituted by three signal lines.

  The downstream signal calibration terminal 40 is an interface for connecting the inter-module calibration cable 202 to connect to the calibration processing unit 20 of FIG. By providing the downstream signal calibration terminal 40 at a position closest to the calibration processing unit 20, the length of the inter-module calibration cable 202 is designed to be the shortest. In some cases, it is connected to another RF module 12.

  The upstream signal calibration terminal 38 is an interface for connecting a terminator or another RF module 12.

  FIG. 3 shows the configuration of the transmission / reception unit 18. The transmission / reception unit 18 includes a first frequency conversion unit 42a, a second frequency conversion unit 42b, an Nth frequency conversion unit 42n, a modulation / demodulation unit 44, and a calibration processing unit 70, which are collectively referred to as a frequency conversion unit 42. A first reception side multiplication unit 48a, a second reception side multiplication unit 48b, an Nth reception side multiplication unit 48n, a weight calculation unit 50, a synthesis unit 52, a processing unit 54, and a transmission side multiplication unit 56, collectively referred to as a reception side multiplication unit 48. Includes a first transmission side multiplication unit 56a, a second transmission side multiplication unit 56b, and an Nth transmission side multiplication unit 56n. The calibration processing unit 70 includes a first signal unit 72a, A signal unit 72b, an Nth signal unit 72n, and a receiving measurement unit 46 are included.

  The frequency conversion unit 42 connects the RF signal line 200 and performs conversion between an intermediate frequency or baseband signal for data communication processing and an RF signal. In addition, an analog-digital converter and a digital-analog converter for converting a baseband signal and a digital signal are included. A digital signal obtained by converting the received RF signal is output to a reception side multiplication unit 48 described later, and a digital signal to be transmitted is input from a transmission side multiplication unit 56 described later.

  The weight calculation unit 50 calculates a coefficient for weighting each input digital signal from the input digital signal. The calculated weighting coefficient is used as a coefficient for weighting a digital signal to be transmitted as it is or after a predetermined conversion. For the calculation of the coefficient, an adaptive algorithm such as an LMS algorithm or RLS algorithm, direction of arrival estimation, or the like is used. For this purpose, another signal (not shown) may be input.

  The reception side multiplication unit 48 multiplies the weighting coefficient calculated by the weight calculation unit 50 and the received digital signal, respectively. The multiplication results are synthesized by the synthesis unit 52.

  The processing unit 54 demodulates the signal combined by the combining unit 52 and further modulates the signal to be transmitted.

  The transmission side multiplication unit 56 multiplies the weighting coefficient calculated by the weight calculation unit 50 and the digital signal to be transmitted.

  The signal unit 72 connects the RF signal line 200 and converts an RF signal and a baseband signal for calibration processing. In order to execute the calibration process simultaneously with the data communication process, a frequency different from the frequency used in the modem unit 44 is used as RF. Further, a continuous wave that is a signal having a predetermined frequency is oscillated for the calibration process. Furthermore, an analog-digital converter and a digital-analog converter for converting a baseband signal and a digital signal are included. In response to the use of only some antennas 10, the control unit 22 selects when some of the signal units 72 are selectively operated.

  The reception measurement unit 46 measures the signal characteristics of the uplink based on the received calibration processing signal. This detects an amplitude ratio and a phase difference between signals transmitted from the calibration processing unit 20 and received by the transmission / reception unit 18. Furthermore, the adjustment of the amplification factor of the LNA 32 may be controlled based on the measurement result.

  FIG. 4 shows the configuration of the calibration processing unit 20. The calibration processing unit 20 includes a variable attenuation unit 60, a signal conversion unit 58, and a transmission measurement unit 64. In FIG. 4, the GPP message line 204 connected to the transmission / reception unit 18 is omitted.

  The variable attenuation unit 60 varies the attenuation amount in order to adjust the input power of the inter-module calibration cable 202 in the reception process. That is, the power of the signal output from the inter-module calibration cable 202 varies depending on the length of the inter-module calibration cable 202, but is adjusted so as to be a value within a predetermined dynamic range.

  The signal converter 58 receives and processes a signal for downlink calibration processing, and further transmits and transmits a signal for uplink calibration processing. The former is input from the variable attenuation unit 60, and the latter is output to the variable attenuation unit 60. Regarding the reception process and the transmission process, the signal converter 58 converts the RF signal and the baseband signal for the calibration process. Further, a continuous wave that is a signal having a predetermined frequency is oscillated for the calibration process. Furthermore, an analog-digital converter and a digital-analog converter for converting a baseband signal and a digital signal are included.

  The transmission measurement unit 64 measures the signal characteristics of the downlink based on the received signal for calibration processing. This detects an amplitude ratio and a phase difference between signals transmitted from the transmission / reception unit 18 and received by the calibration processing unit 20. Furthermore, the adjustment of the amplification factor of PA 30 may be controlled based on the measurement result.

  FIG. 5 shows a flowchart of the calibration process. The transmission / reception unit 18 generates preprocessing parameters necessary for processing before execution of the calibration processing (S10). The transmission / reception unit 18 transmits the preprocessing parameters directly to the calibration processing unit 20 without using the first RF module 12a or the like (S12). When receiving the preprocessing parameter, the calibration processing unit 20 generates a completion message (S14). The completion message is notified to the transmission / reception unit 18 (S16).

  The transmission / reception unit 18 outputs the continuous wave of fcenter + fa shown in FIG. 6 from the eleventh antenna 10aa and the continuous wave of fcenter-fb from the twelfth antenna 10ab in one signal band different from the frequency used in the communication processing. (S18a). Further, these continuous waves are output to the calibration processing unit 20 via the first RF module 12a (S20a). Here, a signal band that is not used for data communication processing is selected as one signal band. The transceiver 18 outputs a continuous wave of fcenter + fa from the eleventh antenna 10aa and a continuous wave of fcenter-fb from the thirteenth antenna 10ac (S18b). Further, these continuous waves are output to the calibration processing unit 20 via the first RF module 12a (S20b).

  Hereinafter, the transmission / reception unit 18 changes the antenna that is not the eleventh antenna 10aa, and outputs a fcenter-fb continuous wave from all antennas. Finally, a continuous wave of fcenter + fa is output from the eleventh antenna 10aa, and a continuous wave of fcenter-fb is output from the N3rd antenna 10nc (S18 (3n-1)). Further, these continuous waves are output to the calibration processing unit 20 via the first RF module 12a and the NRF module 12n (S20 (3n-1)). If the calibration processing unit 20 receives the continuous wave, the calibration processing unit 20 generates a completion message (S22). The completion message is notified to the transmission / reception unit 18 (S24).

  The calibration processing unit 20 outputs a continuous wave having a predetermined frequency (S26). Furthermore, these continuous waves are output to the transmission / reception unit 18 via the RF module 12 (S28). The transmission / reception unit 18 generates a calibration parameter (S30) and transmits it to the calibration processing unit 20 (S32). When receiving the calibration parameter, the calibration processing unit 20 generates a completion message (S34). The transmission measuring unit 64 of the calibration processing unit 20 calculates an amplitude ratio and a phase difference based on the swell of the synthesized wave. The completion message is notified to the transmission / reception unit 18 (S36). On the other hand, the calibration processing unit 20 generates a calculation parameter (S38) and transmits it to the transmission / reception unit 18 (S40). When receiving the calculation parameter, the transmission / reception unit 18 generates a completion message (S42). The completion message is notified to the calibration processing unit 20 (S44). The reception measurement unit 46 of the transmission / reception unit 18 also calculates the amplitude ratio and the phase difference.

  With the above configuration, the inter-module calibration cable 202 and the inter-coupler calibration cable 206 are provided separately from the data communication process for the calibration process. When there are a plurality of antennas 10, the number of inter-coupler calibration cables 206 is larger than that of the inter-module calibration cables 202, and the length of the inter-coupler calibration cables 206 is shorter than that of the inter-module calibration cables 202. Therefore, the length of the cable can be shortened as compared with the case where all the modules are configured with the inter-module calibration cable 202. In particular, when the RF module 12 is installed at a high place, the effect is further increased.

  For example, if the RF module 12 is installed at 100 meters, the number of antennas 10 is three, and the length of the calibration cable 206 between couplers is shortened to a negligible level, a total of 300 meters can be shortened to 100 meters. It is. Furthermore, if the cost per meter of the cable is between 1000 yen and 10,000 yen, the cost can be reduced from 200000 yen to 2000000 yen. The cost reduction effect is further increased if the number of antennas 10 is increased and the RF module 12 is installed at a higher location.

  According to the present embodiment, after the couplers connected to each of the plurality of antennas are connected in series by the first calibration cable, the calibration process in the signal processing apparatus and the coupler connected to one antenna is performed. Since the units are connected by the second calibration cable, the number of calibration cables between the RF module and the signal processing device can be reduced, and the total length of necessary cables can be reduced. Moreover, since the downstream signal calibration terminal 40 of the RF module 12 can be reduced, the connection process of the RF module can be simplified.

  The present invention has been described based on the embodiments. This embodiment is an exemplification, and it will be understood by those skilled in the art that various modifications can be made to combinations of the respective constituent elements and processing processes, and such modifications are also within the scope of the present invention. is there.

  In this embodiment, the inter-module calibration cable 202 is connected to one RF module 12. However, the present invention is not limited to this, and a plurality of RF modules 12 are connected by an inter-coupler calibration cable 206. The inter-module calibration cable 202 may be connected to the RF module 12. At that time, the upstream signal calibration terminal 38 of one RF module 12 and the downstream signal calibration terminal 40 of another RF module 12 are connected by an inter-coupler calibration cable 206. Or you may use combining said connection form and this connection form. According to this modification, the cable length for the calibration process can be further shortened. That is, the RF module 12 may be connected by the inter-coupler calibration cable 206 to such an extent that the accuracy of the calibration process does not deteriorate.

  In the present embodiment, a cable is assumed as the calibration cable 206 between couplers, but the present invention is not limited to this, and it may be configured by a semi-rigid or a pattern. According to this modification, the amount of power attenuation between the couplers 26 can be reduced, and the RF module 12 can be downsized.

  In the present embodiment, base station apparatus 100 is assumed. However, the present invention is not limited to this. For example, a radio terminal apparatus may be used.

It is a figure which shows the structure of the base station apparatus which concerns on this Embodiment. It is a figure which shows the structure of the 1st RF module of FIG. It is a figure which shows the structure of the transmission / reception part of FIG. It is a figure which shows the structure of the calibration process part of FIG. It is a flowchart which shows the calibration process of FIG. It is a figure which shows the frequency arrangement | positioning of the signal in the calibration process of FIG.

Explanation of symbols

  10: Antenna, 12: RF module, 14: Signal processing device, 16: Network, 18: Transmission / reception unit, 20: Calibration processing unit, 22: Control unit, 24: Terminal for antenna, 26: Coupler, 28: Antenna side Switch: 30: PA, 32: LNA, 34: Signal processing device side switch, 36: Signal processing device terminal, 38: Up signal calibration terminal, 40: Down signal calibration terminal, 42: Frequency converter, 44: Modulator / Demodulator 46: Receiving measurement unit 48: Reception side multiplication unit 50: Weight calculation unit 52: Synthesis unit 54: Processing unit 56: Transmission side multiplication unit 58: Signal conversion unit 60: Variable attenuation 64: Measurement unit for transmission, 70: Calibration processing unit, 72: Signal unit, 100: Base station apparatus, 200: RF signal line, 202: Inter-module calibration cable, 204: GPP message line, 206: Inter-coupler calibration cable.

Claims (6)

A signal processing terminal group composed of a plurality of signal processing terminals for respectively connecting a plurality of signal terminals provided in a transmission / reception apparatus for signal transmission / reception processing;
A group of antenna terminals composed of a plurality of antenna terminals for connecting a plurality of antennas, respectively;
An amplifier group comprising a plurality of amplifiers provided between each of the plurality of signal processing terminals and each of the plurality of antenna terminals;
A coupler group comprising a plurality of couplers provided between each of the plurality of antenna terminals and each of the plurality of amplifiers;
A first calibration cable for connecting the plurality of couplers in series;
A second calibration cable for connecting one of the plurality of connected couplers and a calibration processing device for performing signal processing for calibration;
A signal processing module comprising:   The signal processing module according to claim 1, wherein the first calibration cable is configured by a cable that is thinner than the second calibration cable.   The signal processing module according to claim 1, wherein the second calibration cable is connected to a coupler closest to the calibration processing device among a plurality of couplers. A transmission / reception unit that performs signal transmission / reception processing;
An amplifier group comprising a plurality of amplifiers respectively connected to a plurality of signal terminals provided in the transceiver unit;
A coupler group consisting of a plurality of couplers provided between each of the plurality of amplifiers and each of the plurality of antennas;
A first calibration cable for connecting the plurality of couplers in series;
A second calibration cable connecting one end to one of the connected couplers;
A calibration processing unit connected to the other end of the second calibration cable and performing signal processing for calibration;
A wireless device comprising: The calibration processing unit
The radio apparatus according to claim 4, further comprising: a variable attenuation unit that attenuates power of a signal for calibration according to a length of the connected second calibration cable. A transmission / reception unit that performs signal transmission / reception processing;
An amplifier group comprising a plurality of amplifiers respectively connected to a plurality of signal terminals provided in the transceiver unit;
A coupler group consisting of a plurality of couplers provided between each of the plurality of amplifiers and each of the plurality of antennas;
A first calibration cable for connecting the plurality of couplers in series;
A second calibration cable connecting one end to one of the connected couplers;
A calibration processing unit connected to the other end of the second calibration cable and performing signal processing for calibration;
A radio base station comprising:

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