JP6193062B2 - Aggregation / relay station equipment - Google Patents

Description

  Embodiments described herein relate generally to an aggregation / relay station apparatus.

  Conventionally, as a communication system for expanding a communication area of a mobile phone terminal device, a relay device that connects one base station device and a plurality of antennas has been used. In order to reduce the installation space, a multiband communication system that receives a plurality of frequencies with one antenna has been proposed.

  By the way, a relay apparatus that performs distribution / combination for connecting between a plurality of antennas and a base station apparatus is currently used. As one aspect of this relay apparatus, MIMO (Multiple-Input and Multiple-Output) is used. A plurality of slave station devices having a configuration and capable of receiving signals of a plurality of frequencies, and an aggregation / relay station device that performs aggregation and relay of communication in the plurality of slave station devices are connected by a coaxial cable is there.

The operations of the slave station apparatus and the aggregation / relay station apparatus in the uplink of the relay apparatus in this manner are as follows.
In the slave station apparatus, each signal is down-converted into a signal of a different intermediate frequency band, and then combined and transmitted as a combined uplink signal to the aggregation / relay station apparatus using a single coaxial cable.

As a result, in the aggregation / relay station apparatus, the combined uplink signals of the plurality of slave station apparatuses are integrated (combined), converted to digital data by an A / D converter, and further subjected to electro / optical conversion to obtain an optical signal. Is transmitted to the master station device.
Then, the master station device that has received the optical signal up-converts the signal to a predetermined RF signal and transmits it to the base station device.

  In such a configuration, the aggregation / relay station apparatus during the uplink operation synthesizes the combined uplink signals of a plurality of slave station apparatuses and captures them by the A / D converter. There is a problem that the index NF is easily deteriorated and the reception sensitivity is deteriorated. In particular, the noise figure NF deteriorates as the number of slave station devices increases.

  For this reason, in the conventional aggregation / relay station apparatus, the intermediate frequency band signal transmitted from the slave station apparatus is extracted as a respective signal by a band pass filter, and each output signal of the A / D converter is converted into a digital signal. There has also been proposed a configuration that takes in a processing unit.

JP2012-160956A

  According to the above configuration, the influence of other signals when taking in by the A / D converter is reduced, and further, when the combined power is large and an overflow occurs in the A / D converter, the A / D converter By reducing the signal level with a variable attenuator provided in the previous stage of the D converter, overflow in the A / D converter can be avoided, but a band pass filter and an A / D converter are required for each intermediate frequency band. There was a problem that the mounting area and cost increased.

  The present invention has been made in view of the above, and provides an aggregation / relay station apparatus capable of reducing the mounting area and the manufacturing cost while suppressing the influence of overflow distortion in an A / D converter. There is.

Synthesis of aggregation and relay station apparatus embodiment, a plurality of synthetic uplink signals input from a plurality of slave stations which communicate with mobile communication terminal device is input, combining the plurality of synthetic uplink signal The integrated uplink signal is output to the coupler unit.
Coupler unit outputs the first output terminal for outputting a signal level of the input integrated uplink signal as a first signal level to the 1A / D converter, from the first signal level the signal level of the integration uplink signal Is output from the second output terminal to the second A / D converter as the second signal level attenuated by a predetermined level.
The first A / D converter performs analog / digital conversion of the integrated uplink signal output from the first output terminal and outputs the converted signal to the switch unit .
The second A / D converter outputs the integrated uplink signal output from the second output terminal to the analog / digital conversion switch unit .
On the other hand, the determination unit may cause distortion in the first A / D converter due to the signal level of the integrated uplink signal input to the first A / D converter based on the output data of the second A / D converter. detecting a data segment, the switch unit is switched to the output data of the 2A / D converter combined signal level output data of the 1A / D converter in the detected data section, transmission section is output from the switch unit The output data of the first A / D converter or the second A / D converter is transmitted to the master station device for relay.

FIG. 1 is a schematic configuration block diagram of a communication system according to the first embodiment. FIG. 2 is a schematic configuration block diagram of the aggregation / relay station apparatus according to the first embodiment. FIG. 3 is an explanatory diagram of the operating principle. FIG. 4 is a schematic configuration block diagram of the aggregation / relay station apparatus according to the second embodiment. FIG. 5 is a schematic configuration block diagram of the aggregation / relay station apparatus according to the third embodiment. FIG. 6 is a schematic configuration block diagram of the aggregation / relay station apparatus according to the fourth embodiment.

Next, embodiments will be described with reference to the drawings.
[1] First Embodiment FIG. 1 is a schematic configuration block diagram of a communication system according to a first embodiment.
The communication system 10 includes a plurality of mobile phone terminal devices 11-1 to 11-3 and a plurality of slave station devices 12-1 to 12-n that can be wirelessly connected to the mobile phone terminal devices 11-1 to 11-3. And an aggregation / relay station that is connected to the plurality of slave station apparatuses 12-1 to 12-n via a coaxial cable and synthesizes, aggregates, and relays the transmission signals of the plurality of slave station apparatuses 12-1 to 12-n An apparatus 13, a central station apparatus 14 connected to the aggregation / relay station apparatus 13 via an optical cable, and a plurality of base station apparatuses 15-1 and 15-2 connected to the master station apparatus 14 via a coaxial cable, It is equipped with.

First, the configuration of the slave station devices 12-1 to 12-n will be described.
Since the plurality of slave station devices 12-1 to 12-n have the same configuration, the slave station device 12-1 will be described.

  The slave station device 12-1 is connected to each of the plurality of antennas 21-1, 21-2 and the respective antennas 21-1, 21-2, and outputs uplink signals (RF signals) having different frequency bands. A plurality of SAW (Surface Acoustic Wave) filters 22-1 to 22-4 and the uplink signals (RF signals) output from the SAW filters 22-1 to 22-4 are down-converted to generate combined uplink signals B1 to B4. Downconverters (D / C) 23-1 to 23-4 to be converted to synthesize and downconverted uplink signals B1 to B4 are combined, and the combined uplink signal (combined baseband signal) SB is sent to the aggregation / relay station apparatus 13. And synthesizer 24 for transmitting as -1.

Next, the configuration of the aggregation / relay station apparatus 13 will be described.
FIG. 2 is a schematic configuration block diagram of the aggregation / relay station apparatus according to the first embodiment.
The aggregation / relay station device 13 synthesizes (integrates) the combined uplink signals SB-1 to SB-n of the plurality of slave station devices 12-1 to 12-n to integrate the uplink signal (integrated baseband signal) TB. And the signal level of the integrated uplink signal TB and the first output terminal T1 that outputs the signal level of the input integrated uplink signal TB as it is (= first signal level: attenuation = 0 dB). A coupler (coupler unit: directional coupler) 32 having a second output terminal T2 that outputs XdB attenuated (= second signal level: attenuation = XdB) and an integrated uplink output from the first output terminal T1. A first A / D converter 33 that performs analog / digital conversion of the signal TB and an analog / digital conversion of the integrated uplink signal TB output from the second output terminal T2. The a 2A / D converter 34, and a digital processing unit 35 for processing the output data of the 1A / D converter 33 and the 2A / D converter 34, the performed.

The digital processing unit 35 includes a level adjusting unit 41 that adjusts the value of the output data of the second A / D converter 34 to the signal level of the output data of the first A / D converter 33 so as to cancel the attenuation amount in the coupler 32, and Based on the output data of the 2A / D converter 34, a data section in which distortion due to the signal level of the integrated uplink signal TB input to the first A / D converter 33 may occur in the first A / D converter 33. The distortion detection / compensation unit 42 that detects and switches the output data of the first A / D converter 33 in the data section to the output data of the second A / D converter 34 that matches the signal level, and the first A / D converter 33 or the second A transmission unit 43 for transmitting the output data of the 2A / D converter 34 to relay to the master station device 14; , A delay unit 44 which output is delayed outputs to the distortion detection and compensation unit 4 2 of the 1A / D converter 33, a delay unit to the output of the delaying level adjusting unit 41 of the 2A / D converter 34 45 And.

  Note that the delay unit 44 and the delay unit 45 may be configured not to be provided when the delay amount is small and the influence on the processing is small. It is possible to perform high processing.

The distortion detection / compensation unit 42 determines whether or not the signal level of the original integrated uplink signal TB corresponding to the output data of the second A / D converter 34 exceeds the reference signal level, that is, whether the second A / D converter 34 Discrimination for detecting a data section in which distortion due to the signal level of the integrated uplink signal input to the first A / D converter 33 may occur in the first A / D converter 33 based on the output data. And a switch unit 52 that switches the output data of the first A / D converter 33 to the output data of the second A / D converter 34 that matches the signal level based on the determination result of the determination unit 51. ing.
The transmission unit 43 performs first to fourth down conversion of output data corresponding to each of the integrated uplink component signals TB1 to TB4 constituting the integrated uplink signal among the output data of the distortion detection / compensation unit 42. Corresponding to each of converters 53-1 to 53-4 and first to fourth down converters 53-1 to 53-4, noise such as quantization noise (especially intermediate frequency band components not required for processing) is removed. Filters 54-1 to 54-4, and an electric / optical converter 55 that performs electric / optical conversion of the output signals of the filters 54-1 to 54-4.

The delay unit 44 and the delay unit 45 work together so that the output data of the first A / D converter 33 and the output data of the second A / D converter 34 correspond to the processing timing of each output data in the distortion detection / compensation unit 42. Make adjustments to maintain the relationship.

Next, the configuration of the master station device 14 will be described.
The master station device 14 receives the optical signal transmitted from the aggregation / relay station device 13 via the optical cable, separates it into signals corresponding to the combined uplink signals B1 to B4, and D corresponding to each not shown. Base station apparatus corresponding to an uplink signal (RF signal) corresponding to an up-converted intermediate frequency signal corresponding to the combined uplink signal B1 by the optical / electric conversion unit 71 respectively outputting as an intermediate frequency signal by the A / A converter The first up-converter 72-1 to be transmitted to 15-1 and the intermediate frequency signal corresponding to the combined uplink signal B 2 are up-converted to the corresponding base station apparatus 15-1 as the corresponding uplink signal (RF signal). The second up-converter 72-2 to be transmitted and the intermediate frequency signal corresponding to the combined uplink signal B3 are increased. The third up-converter 72-3 that converts and transmits the corresponding uplink signal (RF signal) to the corresponding base station apparatus 15-2 and the intermediate frequency signal corresponding to the combined uplink signal B4 are up-converted And a fourth up-converter 72-4 that transmits the corresponding uplink signal (RF signal) to the corresponding base station apparatus 15-2.

Next, the operation of the first embodiment will be described.
When wirelessly connected to the cellular phone terminal devices 11-1 to 11-3, the plurality of SAW filters 22-1 and 22-2 of the plurality of slave station devices 12-1 to 12-n The uplink signals (RF signals) of different frequency bands input via 1 and 2 1-2 are respectively output.

The down converters (D / C) 23-1 to 23-4 down-convert the uplink signals (RF signals) output from the SAW filters 22-1 to 22-4 to down-convert uplink signals B 1 to B 4. Convert.
As a result, the combining unit 24 combines the down-converted uplink signals B1 to B4 to form the combined uplink signal (combined baseband signal) SB-1 (to SBn) via the coaxial cable. Send to.

  The combining unit 31 of the aggregation / relay station apparatus 13 combines (integrates) the combined uplink signals (combined baseband signals) SB-1 to SBn of the plurality of slave station apparatuses 12-1 to 12-n to perform integrated uplink. The signal (integrated baseband signal) TB is output to the coupler 32.

  The coupler 32 functions as a directional coupler, and the signal level of the input integrated uplink signal TB is kept as it is (= first signal level: attenuation = 0 dB) from the first output terminal T1 (via the main signal path). ) Output to the first A / D converter 33.

  The first A / D converter 33 performs analog / digital conversion of the input integrated uplink signal TB and outputs the result to the switch unit 52 constituting the distortion detection / compensation unit 42 of the digital processing unit 35.

  In parallel with this, the coupler 32 attenuates the signal level of the integrated uplink signal TB by XdB (= second signal level: attenuation = XdB) from the second output terminal T2 (via the reference signal path). The data is output to the 2A / D converter 34.

The second A / D converter 34 performs analog / digital conversion of the input integrated uplink signal TB and outputs the result to the level adjustment unit 41 of the digital processing unit 35.
The level adjustment unit 41 adjusts the value of the output data of the second A / D converter 34 to the signal level of the output data of the first A / D converter 33 so as to cancel the attenuation amount in the coupler 32, and detects and compensates the distortion. The data is output to the determination unit 51 and the switch unit 52 that constitute 42.

  The determination unit 51 of the distortion detection / compensation unit 42 determines whether or not the signal level of the original integrated uplink signal corresponding to the output data of the second A / D converter 34 exceeds the reference signal level.

  Here, the reference signal level is determined based on the signal level of the integrated uplink signal TB that overflows the first A / D converter 33, and the original integrated uplink corresponding to the output data of the second A / D converter 34. When the signal level of the signal TB exceeds the reference signal level, the determination unit 51 causes distortion in the first A / D converter 33 due to the signal level of the integrated uplink signal input to the first A / D converter 33. It is determined that the data section is likely to occur.

  As a result of the determination by the determination unit 51, the switch unit 52 has a data section in which distortion due to the signal level of the integrated uplink signal input to the first A / D converter 33 may occur in the first A / D converter 33. In this case, switching to the second A / D converter 34 is performed.

FIG. 3 is an explanatory diagram of the operating principle.
Here, the integrated uplink signal TB includes integrated uplink component signals TB1, TB2, TB3, and TB4 for each intermediate frequency band.
FIG. 3 is an operation principle explanatory diagram when the signal level of only the integrated uplink component signal TB3 among the plurality of integrated uplink component signals TB1, TB2, TB3, and TB4 corresponding to the integrated uplink signal TB is high.

  As shown in FIG. 3, when only the signal level of the integrated uplink component signal TB3 (power level in FIG. 3) is high enough to cause overflow distortion in the first A / D converter 33 (FIG. 3A). , Only the integrated uplink component signal TB3 exceeds the power level OFL that generates overflow distortion), the signal level of the integrated uplink component signal TB3 exceeds the reference signal level (= power level OFL). During this period, instead of the output of the first A / D converter 33, a signal obtained by adjusting the output of the second A / D converter 34 by the level adjustment unit 41 is output to the transmission unit 43.

  More specifically, as shown in FIG. 3 (b), when the plurality of integrated uplink component signals TB1, TB2, TB3, and TB4 are input to the second A / D converter 34, the coupler 32 The signal level of the signal TB is attenuated by XdB (= second signal level: attenuation = XdB) and input as a plurality of integrated uplink component signals TB1x, TB2x, TB3x, TB4x.

  Therefore, in the data section in which only the integrated uplink component signal TB3 exceeds the power level OFL that generates overflow distortion, as shown in FIG. 3C, the integrated uplink output by the second A / D converter 34. The integrated uplink component signals TB1x +, TB2x +, TB3x +, TB4x + obtained by adjusting the levels of the component signals TB1x, TB2x, TB3x, TB4x by the level adjustment unit 41 are output to the transmission unit 43.

  As a result, the power level OFL1 causing the overflow distortion of the second A / D converter 34 is set higher than the power level OFL as shown in FIG. 3C, and the overflow distortion of the second A / D converter 34 is set. Will not occur.

  Here, a data section in which distortion (overflow distortion) due to the signal level of the integrated uplink signal TB input to the first A / D converter 33 may occur in the first A / D converter 33 is an actual operation. Is temporarily generated, and among the integrated uplink component signals TB1, TB2, TB3, TB4 corresponding to the integrated uplink signal TB, the integrated uplink component signals TB1, TB2, TB3 in which no overflow has occurred , There is little effect on TB4.

  The first down converter 53-1 of the transmission unit 43 includes the integrated uplink signal TB so that the center frequency of the integrated uplink component signal TB1 is DC center (0 Hz) in the output data of the distortion detection / compensation unit 42. The output data corresponding to is down-converted and output to the filter 54-1.

  Similarly, the second down converter 53-2 converts the output data of the distortion detection / compensation unit 42 into the integrated uplink signal TB so that the center frequency of the integrated uplink component signal TB2 becomes the DC center (0 Hz). The corresponding output data is down-converted and output to the filter 54-2. The third down-converter 53-3 has the center frequency of the integrated uplink component signal TB3 in the output data of the distortion detection / compensation unit 42. The output data corresponding to the integrated uplink signal TB is down-converted so that the DC center (0 Hz) is obtained, and is output to the filter 54-3. The fourth down converter 53-4 is connected to the distortion detection / compensation unit 42. Of the output data, the integrated uplink component signal TB4 is integrated up to the center frequency of the DC center (0 Hz). It performs down-conversion of the output data corresponding to the click signal TB, and outputs to the filter 54-4.

As a result, the filter 54-1 removes noise such as quantization noise of the output data of the first down converter 53-1 (particularly components of the integrated uplink component signals TB2, TB3, and TB4 that are not necessary for processing). And output to the electric / optical converter 55.
Similarly, the filter 54-2 removes noise such as quantization noise (particularly the components of the integrated uplink component signals TB1, TB3, and TB4 that are not necessary for processing) from the output data of the second down converter 53-2, The filter 54-3 outputs noise such as quantization noise of output data of the third down-converter 53-3 (components of the integrated uplink component signals TB1, TB2, and TB4 that are not particularly necessary for processing). ) And is output to the electric / optical converter 55. The filter 54-4 is configured to output noise (such as an integrated uplink component signal not required for processing) such as quantization noise of output data of the fourth down converter 53-4. TB1, TB2, and TB3 components) are removed and output to the electric / optical converter 55.

The electrical / optical conversion unit 55 performs electrical / optical conversion of the output signals of the filters 54-1 to 54-4, and transmits the optical signal to the master station device 14 via the optical cable.
The optical / electrical conversion unit 71 of the master station device 14 receives the optical signal transmitted from the aggregation / relay station device 13 via the optical cable and separates it into signals corresponding to the combined uplink signals B1 to B4.

  As a result, the first up-converter 72-1 up-converts the signal corresponding to the integrated uplink component signal TB1 and transmits it to the corresponding base station apparatus 15-1 as the corresponding RF signal, and the second up-converter 72- 2 and a signal corresponding to the integrated uplink component signal TB2 are up-converted and transmitted as a corresponding RF frequency signal to the corresponding base station apparatus 15-1.

  Similarly, the third up-converter 72-3 up-converts a signal corresponding to the integrated uplink component signal TB3 and transmits it to the corresponding base station apparatus 15-2 as a corresponding intermediate frequency signal, and the fourth up-converter 72- 4 up-converts a signal corresponding to the integrated uplink component signal TB4 and transmits it to the corresponding base station apparatus 15-2 as a corresponding RF frequency signal.

  As a result, the base station apparatuses 15-1 and 15-2 exchange with the mobile phone network based on the received RF signal.

  As described above, according to the first embodiment, the first integrated signal having the higher input signal level is obtained by taking it into the two A / D converters 33 and 34 with the difference in the input signal level of the same integrated uplink signal. In the data section in which overflow may occur in the / D converter 33, instead of the output data of the first A / D converter 33, the second A / D according to the power level of the output data of the first A / D converter 33 is used. Since down-conversion is performed for each baseband signal using the output data of the converter 34, processing is not performed using output data in a state where an overflow has occurred effectively, and deterioration of signal characteristics can be suppressed. .

  Further, as a configuration for obtaining the above effect, it is not necessary to provide an A / D converter for each intermediate frequency band, and only one pair of A / D converters is used. The band pass filter (BPF) for each band can also be reduced. As a result, the mounting area and the manufacturing cost can be suppressed.

[2] Second Embodiment FIG. 4 is a schematic configuration block diagram of an aggregation / relay station apparatus according to a second embodiment.
In FIG. 4, the same parts as those in the first embodiment of FIG.

  4 differs from the first embodiment of FIG. 2 in that an amplifier 61 (amplification factor = ZdB) is provided in the previous stage of the first A / D converter 33 and the level adjustment unit 41 is replaced with an amplification factor = ( X + Z) dB level adjustment section 41A is provided.

  According to this configuration, in addition to the effects of the first embodiment, not only the overflow distortion of the first A / D converter 33 but also the influence of distortion caused by the nonlinear characteristic of the amplifier 61 can be removed. In a situation where no distortion occurs, the S / N can be improved by amplification by the amplifier 61.

[3] Third Embodiment FIG. 5 is a schematic configuration block diagram of an aggregation / relay station apparatus according to a third embodiment.
In FIG. 5, the same parts as those in the second embodiment in FIG. 4 are denoted by the same reference numerals.

  5 is different from the second embodiment of FIG. 4 in that power measurement couplers 62-1 and 62-2 are provided in a stage before the first A / D converter 33, a stage after the amplifier, and a stage before the second A / D converter. The power measurement units 63-1 and 63-2 for detecting the input power levels of the first A / D converter 33 and the second A / D converter 34 are provided, and the average of the second A / D converters output from the level adjustment unit 41B The level control unit 64 is provided in the preceding stage of the level adjustment unit 41B so that the power level becomes equal to the average power level of the output data of the first A / D converter.

  According to this configuration, in addition to the effects of the first and second embodiments, the distortion caused by the overflow distortion of the first A / D converter 33 and the nonlinearity of the amplifier can be obtained without knowing the gain of the coupler or the amplifier. In addition to eliminating the influence, it is possible to absorb power fluctuations when the characteristics of the first A / D converter 33 and the amplifier fluctuate due to temperature changes or the like, and to perform more accurate operation.

[4] Fourth Embodiment FIG. 6 is a schematic configuration block diagram of an aggregation / relay station apparatus according to a fourth embodiment.
In FIG. 6, the same parts as those in the second embodiment in FIG. 4 are denoted by the same reference numerals.

  6 is different from the second embodiment of FIG. 4 in that the first A / D converter 33 and the second A / D converter are subsequent to the overflow distortion of the first A / D converter 33 and the nonlinearity of the amplifier, respectively. In the data section in which no distortion occurs, that is, in this data section, the signal input to the synthesizer 31 to such an extent that overflow distortion of the first A / D converter 33 and distortion due to nonlinearity of the amplifier 61 do not occur. Small signal average power measuring units 65-1 and 65-2 for measuring the average power of the small signal portion having a low level are provided, respectively, and the small signal average power level of the second A / D converter 34 output from the level adjusting unit 41B is provided. Is the point that the small data average power level of the output data of the first A / D converter 33 is made equal.

  According to this configuration, in addition to the effects of the third embodiment, the average power can be reduced without being affected by the overflow distortion generated in the first A / D converter 33 and the distortion caused by the nonlinear characteristic of the amplifier of the amplifier. It is possible to calculate, and a more accurate operation can be performed.

[5] Modification of Embodiment In the above description, the dynamic range (number of processing bits) of the first A / D converter 33 and the second A / D converter 34 has not been described. It is preferable to use a wider range including the dynamic range of the first A / D converter 33. For example, when the number of processing bits of the first A / D converter 33 is 14 bits, for example, the number of processing bits of the second A / D converter 34 is increased by 4 bits, and the dynamic range is 16 times (4 × 6 dB = 24 dB). What is necessary is just to use the 18-bit thing. As a result, the occurrence of overflow distortion can be reliably suppressed.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 10 Communication system 11-1 to 11-3 Mobile phone terminal device 12-1 to 12-n Slave station device 13 Aggregation / relay station device 14 Master station device 15-1, 15-2 Base station device 21-1, 21-21 2 antennas 22-1 to 22-4 SAW filter 24 combining unit 31 combining unit 32 coupler 33 first A / D converter 34 second A / D converter 35 digital processing unit 41, 41A, 41B level adjusting unit 42 distortion detecting / compensating unit 43 Transmission unit 51 Discriminating unit 52 Switch unit 53-1 to 53-4 First down converter to fourth down converter 54 Filter 55 Electric / optical conversion unit 61 Amplifier 71 Optical / electrical conversion unit 72-1 to 72-4 First up Converter to 4th up-converter 63 Power measurement unit 64 Level control unit 65 Small signal average power measurement unit OFL Power level B1 B4 Dow convert uplink signal TB Integrated uplink signal TB1 to TB4 Integrated uplink component signal T1 First output terminal T2 Second output terminal

Claims (6)

A plurality of combined uplink signals input from a plurality of slave station devices that communicate with the mobile communication terminal device, a combining unit that combines the plurality of combined uplink signals and outputs an integrated uplink signal;
A first output terminal that outputs the input signal level of the integrated uplink signal as a first signal level and a signal level of the integrated uplink signal that is attenuated by a predetermined level from the first signal level. A coupler unit having a second output terminal for outputting;
A first A / D converter that performs analog / digital conversion of the integrated uplink signal output from the first output terminal;
A second A / D converter that performs analog / digital conversion of the integrated uplink signal output from the second output terminal;
A data section in which distortion due to the signal level of the integrated uplink signal input to the first A / D converter may occur in the first A / D converter based on the output data of the second A / D converter A discriminator for detecting
A switch unit for switching the output data of the first A / D converter in the data section to the output data of the second A / D converter that matches the signal level;
A transmission unit for transmitting the output data of the first A / D converter or the second A / D converter output from the switch unit to relay to a master station device;
Aggregation / relay station equipment with An amplifier unit that performs amplification of the integrated uplink signal output from the first output terminal and outputs the amplified signal before the first A / D converter;
The aggregation / relay station apparatus according to claim 1. When the signal level of the original integrated uplink signal corresponding to the output data of the second A / D converter exceeds a predetermined reference signal level based on the determination of the determination unit, the switch unit The output data of the / D converter is switched to the output data of the second A / D converter.
The aggregation / relay station apparatus according to claim 1 or 2. The reference signal level is determined based on a signal level of the integrated uplink signal that overflows the first A / D converter.
The aggregation / relay station apparatus according to claim 3. A level adjustment unit that adjusts the value of the output data of the second A / D converter to the signal level of the output data of the first A / D converter is provided in the previous stage of the switch unit;
The aggregation / relay station apparatus according to any one of claims 1 to 4. A first data power measuring unit that measures the average power of output data of the first A / D converter that is output data other than the data section;
A second data power measurement unit that measures the average power of the output data of the second A / D converter and that is output data other than the data section;
The level adjustment unit is configured to change a value of output data of the second A / D converter based on measurement results of the first data power measurement unit and the second data power measurement unit, and to output data of the first A / D converter. To match the signal level of
The aggregation / relay station apparatus according to claim 5 .

Images