Wireless integration processing device and wireless communication system

Abstract

To provide a wireless integration processing device capable of enhancing resistance to out-of-synchronization and suppressing bit errors.SOLUTION: According to an embodiment, a wireless integration processing device includes a receiving unit, a symbol rotation correction unit, and a synthesis processing unit. The receiving unit receives communication signals from a plurality of radio receiving devices that transmit communication signals including demodulated data generated by receiving and demodulating a digitally modulated common radio signal and communication quality data of the radio signal, and extracts the demodulated data and the communication quality data from the communication signals. The symbol rotation correction unit corrects symbol rotation of the extracted demodulated data based on the extracted communication quality data to generate post-correction data. The synthesis processing unit diversity-receives the post-correction data based on the extracted communication quality data to generate integrated demodulated data.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] FIELD OF THE INVENTION An embodiment of the present invention relates to a wireless integrated processing device and a wireless communication system. [Background technology]

[0002] Wireless systems are being considered that receive wireless communication signals using multiple wireless receiving devices, aggregate the received signals in a wireless integrated processing device, and generate demodulated data. For example, one known technology involves receiving wireless signals transmitted from the same wireless terminal at multiple base stations and sending them to a wireless integrated processing device for demodulation. In general, in wireless communications, the received power of wireless signals received at different locations is an independent stochastic process. Therefore, even if a signal has low received power at a receiving device in one location, it may be received at high received power at another receiving device. Therefore, demodulation performance can be improved by aggregating signals received by multiple wireless receiving devices in a wireless integrated processing device, selecting signals received by a wireless receiving device with high received power, or weighting and combining the signals received by each wireless receiving device according to their received power and demodulating them. In other words, this technology is an extension of spatial diversity.

[0003] To aggregate the received signals from the wireless receiving devices into the wireless integrated processing device, it is simple to transmit the received signals in the form of analog signals before digital conversion. However, this requires laying a dedicated cable between the wireless receiving devices and the wireless integrated processing device. While this is acceptable if the wireless receiving devices and the wireless integrated processing device are installed at the same location, it is not practical if they are installed at different locations. It is also possible to transmit the received signals in the form of IQ signals after digital conversion. However, this would result in too much communication data between the wireless receiving devices and the wireless integrated processing device, placing a heavy load on the network. Therefore, a technology has been disclosed in which the received digitally modulated signals are demodulated by the wireless receiving devices and the demodulated data is aggregated. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 3009031 [Patent Document 2] Patent No. 2985881 Summary of the Invention [Problem to be solved by the invention]

[0005] The method of aggregating demodulated data also presents challenges. Specifically, it is difficult to synchronize the phases of the demodulated signals in individual wireless receiving devices. Because multiple wireless receiving devices individually synchronize with the wireless signal, they are prone to losing synchronization with each other when the received power drops due to fading or other factors. If a synchronization signal is not inserted within the wireless signal frame, or if the interval between synchronization signals is large, the loss of synchronization may persist for a long period of time. This directly leads to a decrease in the bit error rate, and so a solution was needed.

[0006] Therefore, an object of the present invention is to provide an integrated wireless processing device and a wireless communication system that can improve resistance to out-of-synchronization and suppress bit errors. [Means for solving the problem]

[0007] According to an embodiment, an integrated wireless processing device includes a receiving unit, a symbol rotation correction unit, and a combining unit. The receiving unit receives communication signals from multiple wireless receiving devices that transmit communication signals including demodulated data generated by each receiving and demodulating a digitally modulated common wireless signal and communication quality data of the wireless signal, and extracts the demodulated data and the communication quality data from the communication signals. The symbol rotation correction unit corrects the symbol rotation of the extracted demodulated data based on the extracted communication quality data to generate corrected data. The combining unit performs diversity reception of the corrected data based on the extracted communication quality data to generate integrated demodulated data. [Brief explanation of the drawings]

[0008] [Figure 1]FIG. 1 is a block diagram showing an example of a wireless communication system according to an embodiment. [Figure 2] FIG. 2 is a diagram illustrating an example of a frame format of a digital wireless signal. [Figure 3] FIG. 3 is a diagram showing a signal constellation of QPSK. [Figure 4] FIG. 4 is a diagram illustrating an example of a state in which synchronization is lost. [Figure 5] FIG. 5 is a diagram showing an example of the relationship between QPSK modulation symbols and transmission bits. [Figure 6] FIG. 6 is a diagram for explaining the conversion between demodulated data and symbol data by the symbol rotation corrector 52. In FIG. [Figure 7] FIG. 7 is a diagram for further explaining the operation of the symbol rotation correction unit 52. In FIG. [Figure 8] FIG. 8 is a diagram for explaining the differential symbol data. [Figure 9] FIG. 9 is a diagram showing the setting of bits related to bit inversion. [Figure 10] FIG. 10 is a diagram illustrating an example of corrected data generated by bit inversion. [Figure 11] FIG. 11 is a diagram showing another example of corrected data generated by bit inversion. DETAILED DESCRIPTION OF THE INVENTION

[0009] (composition) 1 is a block diagram showing an example of a wireless communication system according to an embodiment. This system includes a plurality of wireless receiving devices 1A and 1B, each receiving a common digital wireless signal, and an integrated wireless processing device 5. The digital wireless signals are digitally modulated, for example, using the QPSK (Quadrature Phase Shift Keying) method. The wireless receiving devices 1A and 1B each transmit a communication signal based on the received digital wireless signal to the integrated wireless processing device 5 via a network 10. The communication signal is received by the integrated wireless processing device 5 via the network 10.

[0010] The wireless receiving device 1A includes a demodulation unit 11, a channel estimation unit 12, a communication quality estimation unit 13, and a transmission unit . The demodulation unit 11 receives and demodulates the digital radio signal to generate demodulated data, which may be a hard decision result generated by so-called hard decision demodulation. The channel estimation unit 12 estimates the transmission channel of the digital radio signal and notifies the demodulation unit 11 and the communication quality estimation unit 13 of the channel response estimation value. The communication quality estimating unit 13 estimates the communication quality of the digital wireless signal and generates communication quality data. The transmission unit 14 generates a communication signal including the demodulated data (demodulated data A) from the demodulation unit 11 and the communication quality data (communication quality data A) from the communication quality estimation unit 13. Then, the transmission unit 14 transmits this communication signal to the wireless integrated processing device 5 via the network 10.

[0011] The wireless receiving device 1B includes a demodulator 21, a channel estimator 22, a communication quality estimator 23, and a transmitter 24. The demodulator 21, the channel estimator 22, the communication quality estimator 23, and the transmitter 24 have the same functions as the demodulator 11, the channel estimator 12, the communication quality estimator 13, and the transmitter 14 of the wireless receiving device 1A, respectively.

[0012] The wireless integrated processing device 5 includes a receiving unit 51 , a symbol rotation correcting unit 52 , and a combining unit 53 . The receiving unit 51 receives the communication signals transmitted from the wireless receiving devices 1A and 1B, and extracts demodulated data and communication quality data from these communication signals. The extracted demodulated data and communication quality data are output to the symbol rotation correcting unit 52.

[0013] The symbol rotation correction unit 52 corrects the symbol rotation of the extracted demodulated data based on the communication quality data to generate corrected data. That is, the symbol rotation correction unit 52 detects, based on the communication quality data, whether or not there is an event in which the demodulated data transmitted from the wireless receiving devices 1A and 1B are consecutively determined to be erroneous symbols. When such an event is detected, the symbol rotation correction unit 52 applies symbol correction to generate corrected data. This corrected data and the communication quality data are output to the combination processing unit 53.

[0014] The combining unit 53 outputs integrated demodulated data using the corrected data and communication quality data input from the symbol rotation corrector 52. That is, the combining unit 53 performs diversity reception of the corrected data based on the communication quality data to generate integrated demodulated data.

[0015] (action) Next, the operation of the present invention will be described. Fig. 2 is a diagram showing an example of a frame format of a digital radio signal. In this embodiment, as shown in Fig. 2, a frame format is assumed in which a known symbol pattern (synchronization signal) for synchronization is assigned to the beginning portion (preamble) and an information signal is assigned to the following field. The data immediately following the synchronization signal is phase-synchronized, and it can be expected that no symbol rotation has occurred.

[0016] If the information signal is a phase-modulated signal such as QPSK, the wireless receiving devices 1A and 1B rely on the synchronization signal at the beginning of the frame to perform frequency, symbol determination timing, and phase synchronization processing, demodulate the information signal, and obtain demodulated data. However, fading occurs in wireless communication, causing fluctuations in received power and received phase. Therefore, the longer the transmission period of the information signal, the more significant the fluctuations in received power during that period become. As a result, communication quality becomes unstable depending on the time the information signal is transmitted.

[0017] Therefore, in order to apply processing according to the communication quality, not only the demodulated data but also the communication quality data at each time is collected from the wireless receiving devices 1A, 1B to the wireless integrated processing device 5. As the communication quality data, for example, the ratio of signal power to unwanted signal power, such as SNR (Signal Power to Noise Power Ratio) or SINR (Signal Power to Interference and Noise Power Ratio), can be used. If the levels of unwanted wave power, such as noise power and interference wave power, are the same in all the wireless receiving devices 1A, 1B, the received power of the signal itself can be used as the communication quality data.

[0018] When phase fluctuations during information signal transmission due to factors such as fading become significant, demodulation performance deteriorates. Therefore, it becomes necessary to apply synchronization processing to track phase fluctuations. However, if a synchronization signal, which is a known symbol, is not transmitted midway through a frame, blind phase synchronization processing must be performed while performing demodulation processing. Therefore, the demodulated data and communication quality data demodulated by each wireless receiving device 1A, 1B are transmitted to the wireless integrated processing device 5 via the network 10.

[0019] Here, if the IQ data before demodulation is aggregated instead of the demodulated data, for example, if the I channel and Q channel are each quantized to 10 bits, 20 bits must be transmitted per symbol. In contrast, if the demodulated data is aggregated, only 2 bits per symbol must be transmitted using QPSK modulation. As a result, the amount of transmitted data can be reduced to 2 bits / 20 bits, or 1 / 10.

[0020] Also, assuming that communication quality data is quantized in 1dB increments from 3dB or less to 33dB or more and transmitted, only 5 bits are sufficient even if communication quality is transmitted for each symbol, which reduces communication volume compared to aggregating IQ data. Furthermore, by aggregating communication quality at discrete times, such as every few symbols, rather than every symbol, communication volume can be further reduced.

[0021] When the demodulated data and communication quality data are collected in the wireless integrated processing device 5 via the network 10, a protocol conversion process according to the protocol of the network 10 is performed in the transmission units 14 and 24 or the reception unit 51. The protocol of the network 10 is typically TCP / IP, but any other protocol such as serial transmission may be used. The physical layer may be either wireless or wired.

[0022] The wireless integrated processing device 5 extracts the demodulated data and communication quality data sent from the wireless receiving devices 1A, 1B in the receiving unit 51. Here, there are cases where consecutive errors occur in the demodulated data demodulated by each of the wireless receiving devices 1A, 1B. When the wireless receiving devices 1A, 1B receive a signal in a frame format as shown in Figure 2, the synchronization signal is present only at the beginning of the frame. Therefore, if the received power drops during the reception period of the information signal in the middle of the frame, it becomes difficult to synchronize the phase, and synchronization may be lost.

[0023] 3 is a diagram showing a signal point arrangement (constellation) of QPSK. In QPSK, transmission symbols 0 to 3 are mapped to the I channel and the Q channel. For example, transmission symbol 0 is mapped to the first quadrant, symbol 1 to the second quadrant, symbol 2 to the third quadrant, and symbol 3 to the fourth quadrant. However, if the received power decreases in either of the wireless receiving devices 1A and 1B, phase synchronization may be lost and the symbol may be pulled into a quadrant different from its original position.

[0024] Fig. 4 is a diagram showing an example of a state in which synchronization has been lost. When synchronization has been lost, as shown in Fig. 4, transmission symbols 0 to 3 are received at symbol points that are, for example, 90° ahead in phase from those in Fig. 3.

[0025] If the phases were synchronized, transmission symbols 0 to 3 would be received in the first to fourth quadrants, respectively, but in Figure 4, transmission symbol 0 is received in the second quadrant, transmission symbol 1 in the third quadrant, transmission symbol 2 in the fourth quadrant, and transmission symbol 3 in the first quadrant, meaning that they are each received in an adjacent quadrant rotated 90 degrees. When received in this way, each signal is phase-corrected so that it becomes a symbol in a quadrant that is 90 degrees off, and synchronization is achieved in this state.

[0026] In a frame format where no synchronization signal is transmitted midway through the frame, as shown in Figure 2, once synchronization is lost it cannot be corrected, and all subsequent signals will be judged as having been transmitted with symbol points rotated by, for example, 90 degrees. Unless the symbol is accidentally degraded to the correct quadrant due to noise or other reasons, symbol errors will occur in all of them.

[0027] Once synchronization is lost, the phase will remain out of sync even if the fading recovers and the received power returns to its normal level. Therefore, the symbol rotation will not return to normal. Therefore, even if the demodulated data demodulated by the wireless receiving device 1A, 1B with the highest received power is selected (Patent Document 2), or even if weighted combining is performed based on the received power (Patent Document 1), the consecutive errors that occurred due to the loss of synchronization cannot be corrected, and consecutive errors will occur.

[0028] Therefore, in the embodiment, a symbol rotation correction unit 52 is provided to correct the symbol rotation of the demodulated data demodulated by the wireless receiving devices 1A and 1B from the beginning of the information signal. The symbol rotation correction unit 52 divides the demodulated data into, for example, multiple blocks, and corrects the symbol rotation for each block.

[0029] Fig. 5 is a diagram showing an example of the relationship between QPSK modulation symbols and transmission bits. Based on the relationship between modulation symbols and bits, symbol rotation correction unit 52 converts demodulated data A and demodulated data B of the first block demodulated by wireless receiving devices 1A and 1B into symbol data A and symbol data B as shown in Fig. 6.

[0030] Here, it is assumed that the communication quality data A and communication quality data B of the first block have the following values, respectively. Communication quality data A: 30dB Communication quality data B: 3dB In the first block, the communication quality data A is the highest, and the symbol data A is selected as the reference symbol data.

[0031] 7, next, the difference between each symbol data and the reference symbol data is calculated, and the results of a remainder operation using a divisor of 4 are defined as differential symbol data A and differential symbol data B. In the embodiment, a remainder of a negative number is defined as follows:

[0032] -3 mod 4 = 1 -2 mod 4 = 2 -1 mod 4 = 3 When QPSK modulation is applied, the differential symbol data is 0 to 3, and it is measured which value appears most frequently for each differential symbol data.

[0033] 8, the differential symbol data A has the maximum number of 0s. When the differential symbol data has the maximum number of 0s in this way, it can be determined that no symbol rotation has occurred with respect to the reference symbol data.

[0034] On the other hand, as shown in Fig. 8, the differential symbol data B has a maximum of 11 1s, with one 0 and one 2. As a result, the differential symbols are 0s and 2s because random errors have occurred due to noise or the like, and because the maximum number of differences from the reference symbol data is 1, it is determined that symbol data B has rotated counterclockwise by one quadrant (90 degrees) from the reference symbol data.

[0035] As described above, for blocks of demodulated data demodulated by the wireless receiving devices 1A and 1B that are determined to have symbol rotation, the symbol rotation correction unit 52 inverts each bit of the demodulated data corresponding to the symbol rotation. The bits to be inverted vary depending on the value of the symbol data before inversion. When the symbol allocation is applied in the configuration shown in FIG. 5, bit inversion is performed as shown in FIG. 10 according to the table shown in FIG. 9 to obtain corrected data B. Furthermore, for wireless receiving devices that are not determined to have symbol rotation, the demodulated data is used as corrected data as is.

[0036] Since the symbol rotation value of the demodulated data demodulated by wireless receiving device 1B for the first block is determined to be "1," the cumulative symbol rotation value is updated by adding "1" to the cumulative value of the wireless receiving device as follows, and applying a remainder operation with a divisor of 4. Here, the cumulative value corresponds to the amount of phase rotation detected from the first block to the currently processed block, and if the currently processed block is the first block, it corresponds to the amount of phase rotation in the first block. For example, cumulative value 1 corresponds to a 90° rotation, cumulative value 2 corresponds to a 180° rotation, cumulative value 3 corresponds to a 270° rotation, and cumulative value 4 corresponds to a 360° rotation.

[0037] Next, the correction of symbol rotation from the second block onwards will be explained. From the second block onwards, the cumulative symbol rotation value up to the previous block is corrected first. Since the cumulative symbol rotation value of only the wireless receiving device 1B is 1 by the second block, only the value of the second block of demodulated data B is corrected as shown in Fig. 11 to obtain data B after inversion of the cumulative value.

[0038] For demodulated data with a cumulative symbol rotation value of 0, as in the case of wireless receiving device 1A, demodulated data A is used as is as cumulative value inversion data A. Also, in the first block, symbol data is generated from demodulated data as shown in Fig. 6, but from the second block onwards, symbol data is generated from cumulative value inversion data.

[0039] The processing for subsequent blocks is the same as for the first block. That is, the symbol data of the wireless receiving device with the highest communication quality data for that block is selected as reference symbol data, and the difference symbol data between each symbol data and the reference symbol data is calculated. If the difference symbol data has the maximum number of non-zero values, it is determined that symbol rotation has occurred in that block, and symbol rotation correction is applied.

[0040] When correcting the second block and subsequent blocks, the position at which the bits are inverted varies depending on the symbol of the symbol data, just as with the first block. However, for the second block and subsequent blocks, bit inversion is not applied to the demodulated data, but rather to the accumulated value inverted data to obtain corrected data. Furthermore, for wireless receiving devices that are determined to have symbol rotation, the accumulated symbol rotation value is updated in the same way as with the first block.

[0041] As described above, the symbol rotation correction unit 52 applies correction to all the divided blocks, and outputs all the corrected data and all the communication quality data to the combination processing unit 53.

[0042] The combining unit 53 applies diversity reception to the corrected data based on the communication quality data, and generates and outputs integrated demodulated data as final demodulated data. For diversity reception, the corrected data of a specific wireless receiving device may be selected, or the corrected data may be mapped to the modulation points shown in FIG. 3, and then weighted and combined using the communication quality data, and hard decision may be applied again. The number of bits to which the diversity reception process is applied may be applied to the entire information signal all at once, or may be applied in block units like the symbol rotation correction unit 52, or may be applied bit by bit. Any method may be used as long as it is applied to the corrected data input from the symbol rotation correction unit 52.

[0043] (effect) As described above, according to the embodiment, when demodulated data received and processed by the multiple wireless receiving devices 1A and 1B is subjected to integrated processing (diversity reception) by the wireless integrated processing device 5, diversity reception is applied to the data after symbol rotation correction. This makes it possible to obtain highly accurate demodulated data when demodulating a signal in which no synchronization signal is transmitted midway through the frame. From these facts, according to the embodiment, it is possible to provide an integrated wireless processing device and a wireless communication system that can increase resistance to out-of-synchronization and suppress bit errors.

[0044] The present invention is not limited to the above-described embodiment. (First Modification) For example, in a system similar to that shown in FIG. 1, a modified example can be considered in which the demodulated data transmitted from the wireless receiving devices 1A and 1B is not a hard decision result but a soft output (log-likelihood ratio). The log-likelihood ratio is not a hard decision value such as "0" or "1" as shown in FIG. 6, but a value indicating the likelihood of demodulation of each bit. For example, if a positive value is defined as "0" and a negative value as "1," the greater the positive absolute value of the log-likelihood ratio, the more likely it is that a "0" has been transmitted. Conversely, the greater the negative absolute value, the more likely it is that a "1" has been transmitted. Furthermore, the closer the log-likelihood ratio is to 0, the more difficult it is to determine whether a "0" or a "1" has been transmitted. In this modified example, the symbol rotation correction unit 52 of the wireless integrated processing device 5 determines the signal as "0" if the log-likelihood ratio is positive and as "1" if the log-likelihood ratio is negative, and bit inversion is a process of inverting the sign of the log-likelihood ratio. Furthermore, since the absolute value of the log-likelihood ratio indicates the communication quality, demodulated data with high communication quality can be selected by selecting demodulated data with the largest average value of the absolute values ​​of the log-likelihood ratio.

[0045] In addition, in the first variant, the synthesis processing unit 53 adds the log-likelihood ratio calculated by each wireless receiving device to the log-likelihood ratio after correction by the symbol rotation correction unit 52, and uses the resulting log-likelihood ratio as the demodulated data after synthesis processing.

[0046] (Effects of the first modified example) Maximum ratio combining can be easily realized in the combining processor 53 of the integrated wireless processing device 5. Furthermore, when an error correction code is applied to the digital wireless signal, soft decision decoding can be applied using the demodulated data output by the combining processor 53 of the integrated wireless processing device 5, thereby reducing the bit error rate.

[0047] (Second Modification) For example, in the first modification, before transmitting the demodulated data (log-likelihood ratio) from the transmission units 14 and 24 of the wireless receiving devices 1A and 1B, the demodulated data is converted by a sigmoid function. Then, in the receiving unit 51 of the wireless integrated processing device 5, the demodulated data converted by the sigmoid function may be converted by an inverse function of the sigmoid function.

[0048] Equation (1) shows the sigmoid function.

number

[0049] (Effects of the second modified example) In the first modification, the demodulated data is converted into a logarithmic likelihood ratio, which may increase the amount of communication to the integrated wireless processing device 5. According to the second modification, this increase in the amount of communication can be suppressed.

[0050] (Other variations) 1, for example, the form in which demodulated data and communication quality data are extracted from signals transmitted from two wireless receiving devices 1A and 1B is shown, but the number of wireless receiving devices is not limited to 2. The number of wireless receiving devices can be set arbitrarily depending on the system configuration, specifications, etc.

[0051] 6 shows an example in which the number of bits in a block is 26 bits, and the number of symbols in symbol data A and symbol data B is 26. However, the number of symbols and the number of bits in symbol data A and symbol data B are not limited to 13 or 26. The number of symbols can be set arbitrarily.

[0052] Furthermore, the modulation method for digital wireless signals is not limited to QPSK. For example, modulation methods such as DQPSK, 16QAM, and 64QAM (Quadrature Amplitude Modulation) may be used. The 64QAM modulation method transmits signals by changing the carrier wave into 64 different states (symbols) with different amplitudes and phases, and can transmit 6 bits of information per symbol.

[0053] Although the sigmoid function shown in Fig. 12 is used as an example of a conversion function for reducing communication traffic, the function for converting the log-likelihood ratio is not limited to the sigmoid function. Similarly, any nonlinear function that can reduce the number of bits after quantization can be applied.

[0054] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0055] 1A...wireless receiving device, 1B...wireless receiving device, 5...wireless integrated processing device, 10...network, 11...demodulation unit, 12...channel estimation unit, 13...communication quality estimation unit, 14...transmission unit, 21...demodulation unit, 22...channel estimation unit, 23...communication quality estimation unit, 24...transmission unit, 51...reception unit, 52...symbol rotation correction unit, 53...synthesis processing unit.

Claims

1. a receiving unit that receives communication signals from a plurality of wireless receiving devices that transmit communication signals including demodulated data generated by receiving and demodulating a digitally modulated common wireless signal and communication quality data of the wireless signals, and extracts the demodulated data and the communication quality data from the communication signals; a symbol rotation correction unit that corrects a symbol rotation of the extracted demodulated data based on the extracted communication quality data to generate corrected data; a synthesis processing unit that performs diversity reception of the corrected data based on the extracted communication quality data to generate integrated demodulated data.

2. The wireless integrated processing device according to claim 1 , wherein the demodulated data transmitted from the wireless receiving device is a hard decision result.

3. The wireless integrated processing device according to claim 1 , wherein the demodulated data and the communication quality data transmitted from the wireless receiving device are soft decision results.

4. 4. The wireless integrated processing device according to claim 3, wherein the demodulated data transmitted from the wireless receiving device is transformed using a nonlinear function before transmission, and the receiving unit transforms the demodulated data transformed using the nonlinear function before transmission using an inverse function of the function.

5. The system comprises a plurality of wireless receiving devices each receiving a digitally modulated common wireless signal, and an integrated wireless processing device receiving communication signals transmitted from the plurality of wireless receiving devices via a network, Each of the wireless receiving devices a demodulation unit that receives and demodulates the radio signal to generate demodulated data; a communication quality estimation unit that estimates the communication quality of the wireless signal and generates communication quality data; a transmission unit that transmits a communication signal including the demodulated data and communication quality data of the wireless signal to the wireless integrated processing device via the network; The wireless integrated processing device includes: a receiving unit that receives the communication signal and extracts the demodulated data and the communication quality data from the communication signal; a symbol rotation correction unit that corrects a symbol rotation of the extracted demodulated data based on the extracted communication quality data to generate corrected data; a combining processing unit that performs diversity reception of the corrected data based on the extracted communication quality data to generate integrated demodulated data.

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