JP2014236488A - Radio communication system, radio communication device, and radio communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve interference suppression effect by expanding the operation region of adaptive array algorithm.SOLUTION: A radio communication system comprising a radio communication device employing an adaptive array antenna to cope with channel interference comprises: means for dividing a modulation processed transmission signal into signals in multiple bands; means for allocating power so that there will be difference in the magnitude of allocated power between bands when power is allocated to each of the transmission signals in the divided bands; means for combining and transmitting transmission signals of the respective bands after the allocation of power; means for receiving a signal transmitted by the radio communication device for performing signal transmission as a reception signal; means for dividing the reception signal into signals in multiple bands; means for applying array processing weight of a band with good reception quality to a different band when array antenna processing is applied to each of the signals of divided bands; and means for combining reception signals in the respective bands after the array antenna processing and for performing demodulation processing.

Description

  The present invention relates to a wireless communication system, a wireless communication apparatus, and a wireless communication method.

  In order to cope with various large-capacity services accompanying the recent spread of optical access and the like, it is required to improve the transmission speed of wireless communication. Since the occupied frequency band is proportional to the transmission speed, this can be realized by expanding the frequency band. However, since the actual frequency resources are limited, there is a limit to the expansion of the frequency band. In addition, various wireless access systems such as WiFi (registered trademark), WiMAX (registered trademark), and LTE (registered trademark) are widespread, and in particular, frequency resources in the microwave band allocated to these systems. Is in a tight situation.

  Therefore, in order to improve the transmission capacity in a limited frequency resource environment, a transmission / reception station is provided with a plurality of antennas, and spatial division multiplexing transmission by applying MIMO or multi-user MIMO (MU-MIMO) technology is effective. is there. Extending this method, arranging centralized control stations that share channel information, transmission signals, and reception signals among a plurality of base stations, or handle them all at once, and apply (MU-) MIMO technology to make them adjacent Base station cooperation that can eliminate interference between base stations is also being studied. As described above, it is possible to cope with interference by grasping information about interference signals in advance between the same systems.

  In addition, in order to expand the frequency bandwidth and further improve the transmission capacity, it is necessary to share frequency resources among a plurality of systems and to allow the coexistence between the plurality of systems. In order to cope with unknown co-channel interference between different systems, an adaptive array antenna technique as shown in Non-Patent Document 1 is effective. There are various algorithms in adaptive array antenna technology.

  For example, the minimum mean square error (MMSE) method using known information such as a training signal shared between the transmitting and receiving stations, or a blind algorithm that does not require known information is power. There are inversion (Power Inversion; PI) and constant envelope algorithm (CMA). In packet-based wireless communication, MMSE is effective because a training signal is added for timing detection, but in a situation where it is impossible to predict at what timing and at what level interference will arrive. It is considered that PI and CMA that do not require a training signal are effective.

  FIG. 15 is a block diagram illustrating a configuration example of a wireless communication system. The figure shows a wireless communication system comprising a wireless communication device 120a and a wireless communication device 120b. Hereinafter, one or both of the wireless communication device 120a and the wireless communication device 120b are collectively referred to as the wireless communication device 120. The wireless communication device 120 includes a data input / output unit 121, a MAC layer processing unit 122, a communication control unit 123, a reception signal processing unit 124, a transmission signal processing unit 126, a switch 127, and an antenna 128. Yes. Note that the configuration in FIG. 15 is a configuration in which the wireless communication apparatus 120 includes a plurality of antennas 128.

  The data input / output unit 121 inputs data to be transmitted to the destination station. The data input / output unit 121 outputs data input from the MAC layer processing unit 122 to the user. The MAC layer processing unit 122 performs processing related to the MAC layer on the data input from the reception signal processing unit 124 and outputs the processed data to the data input / output unit 121. Further, the MAC layer processing unit 122 performs processing related to the MAC layer on the data input from the data input / output unit 121 and outputs the processed data to the transmission signal processing unit 126.

  The communication control unit 123 controls transmission / reception at the antenna 128, that is, control related to switching of transmission / reception at the switch 127, operation timing control at the reception signal processing unit 124 and transmission signal processing unit 126, and a communication partner. Control related to overall communication such as processing for selecting another wireless communication device 120 and timing control for the entire wireless communication system is performed.

  The reception signal processing unit 124 performs reception signal processing on the reception signal received by the antenna 128. The transmission signal processing unit 126 performs transmission signal processing on the transmission data input from the MAC layer processing unit 122 and transmits the transmission data from the antenna 128. The switch 127 connects the antenna 128 and the transmission signal processing unit 126 at the time of transmission and connects the antenna 128 and the reception signal processing unit 124 at the time of reception according to an instruction from the communication control unit 123.

A transmission operation in wireless communication apparatus 120 will be described.
When data to be transmitted to the destination station is input from the outside to the data input / output unit 121, the MAC layer processing unit 122 converts the data input to the data input / output unit 121 into data to be transmitted / received on a wireless line. Convert. The MAC layer processing unit 122 further outputs transmission data obtained by performing processing such as adding MAC layer header information to the transmission signal processing unit 126.

  The transmission signal processing unit 126 performs modulation processing on the transmission data output from the MAC layer processing unit 122. The transmission signal processing unit 126 transmits the transmission signal obtained by the modulation processing from the antenna 128 via the switch 127.

Next, a reception operation in the wireless communication device 120 will be described.
When signals transmitted from the destination addressed to the device itself are received by the plurality of antennas 128, the received signal (reception signal) is input to the reception signal processing unit 124 via the switch 127. The reception signal processing unit 124 performs array processing on the reception signals received by each of the plurality of antennas 128, and calculates reception weights for acquiring a desired signal from the reception signals. The reception signal processing unit 124 acquires a desired signal from the reception signal using the calculated reception weight, performs various signal processing such as demodulation on the acquired desired signal, and acquires data. The reception signal processing unit 124 outputs the acquired data to the MAC layer processing unit 122.

  The MAC layer processing unit 122 performs processing related to the MAC layer on the data output from the reception signal processing unit 124 (for example, the input / output data to the data input / output unit 121 and the data transmitted / received on the wireless line). Conversion, termination of MAC layer header information, etc.). The MAC layer processing unit 122 causes the data subjected to the processing related to the MAC layer to be output to an output device such as an external display or an external network via the data input / output unit 121.

  Although not particularly specified, the antenna 128 performs D / A (Digital / Analog) conversion and radio frequency on the signal subjected to baseband modulation processing in the transmission signal processing unit 126 during transmission. The signal is transmitted after being up-converted into a signal and further subjected to filter processing for removing out-of-band frequency components. Further, the reverse processing is performed at the time of reception, and then the baseband reception signal is input to the reception signal processing unit 124.

  FIG. 16 is a block diagram illustrating a configuration example of the transmission signal processing unit 126 when the wireless communication apparatus 120 performs single carrier communication. The transmission signal processing unit 126 includes a modulation unit 131. The modulation unit 131 performs symbol mapping processing after performing error correction coding processing on the data output from the MAC layer processing unit 122. For example, a carrier wave having a predetermined bandwidth is modulated based on information on the IQ plane of each symbol. Moreover, the modulation | alteration part 131 inserts a guard interval as needed for the purpose of giving a transmission signal periodicity for a FFT (Fast Fourier Transform; Fast Fourier Transform) process.

  FIG. 17 is a block diagram illustrating a configuration example of the transmission signal processing unit 126 when the wireless communication apparatus 120 performs communication using the OFDM modulation scheme or the OFDMA modulation scheme. The transmission signal processing unit 126 includes a modulation unit 131, a serial / parallel conversion unit 132, and an IDFT (Inverse Discrete Fourier Transform) unit 133. The modulation unit 131 performs symbol mapping processing after performing error correction coding processing on the data output from the MAC layer processing unit 122.

  The serial / parallel converter 132 performs serial / parallel conversion on the symbols mapped by the modulator 131, and outputs a plurality of obtained symbol strings to the IDFT unit 133. The IDFT unit 133 performs IDFT on the plurality of symbol sequences output from the serial / parallel conversion unit 132, converts the signal in the frequency domain into a signal in the time domain, and outputs the signal to the antenna 128. In addition, the transmission signal processing unit 126 performs insertion of a guard interval, waveform shaping processing between OFDM symbols, and the like as necessary, and outputs an electric signal to be transmitted to the antenna 128.

  FIG. 18 is a block diagram illustrating a configuration example of the reception signal processing unit 124 when the wireless communication apparatus 120 performs single carrier communication. In the figure, a configuration in the case where the wireless communication apparatus 120 includes two antennas 128 is shown. The reception signal processing unit 124 includes an adaptive array processing unit 152, a multiplier 153 provided corresponding to the antenna 128, an adder 154, and a demodulation unit 156. Two received signals (received signal 1 and received signal 2) input from the antenna 128 to the received signal processing unit 124 are input to an adaptive array processing unit 152 and a multiplier 153 provided for each received signal. Is done.

  The adaptive array processing unit 152 uses a predetermined algorithm (such as PI or CMA) to weight the interference signal included in the reception signal 1 and the reception signal 2 based on the input reception signal 1 and the reception signal 2. calculate. The adaptive array processing unit 152 inputs the calculated weight to the multiplier 153. Multiplier 153 multiplies input reception signal 1 by a weight and outputs the multiplication result to adder 154. The adder 154 adds the multiplication results output from the two multipliers 153 and inputs the addition results to the demodulation unit 156. In this way, one system of signals in which interference signals are suppressed is obtained by array processing including weight multiplication and synthesis.

  Demodulation section 156 extracts symbols demapped by orthogonal demodulation processing from the received signals subjected to array processing, and performs error correction decoding processing on the extracted symbols to obtain a final data series. . Demodulation section 156 outputs the acquired data series to MAC layer processing section 122.

  Next, an operation when radio communication apparatus 120 performs communication using a multicarrier transmission scheme will be described. As an example, description will be made using an OFDM or OFDMA modulation scheme. FIG. 19 is a block diagram illustrating a configuration of the reception signal processing unit 124 when the wireless communication apparatus 120 performs communication using the OFDM modulation scheme or the OFDMA modulation scheme. In the same figure, as in the configuration example shown in FIG. 18, a configuration in the case where the wireless communication apparatus 120 includes two antennas 128 is shown. The received signal processing unit 124 includes a DFT unit 151, a plurality of adaptive array processing units 152, a plurality of multipliers 153, a plurality of adders 154, a parallel / serial conversion unit 155, and a demodulation unit 156. ing. The DFT unit 151 is provided corresponding to the antenna 128. An adaptive array processor 152 and an adder 154 are provided for each subcarrier. Multiplier 153 is provided for each subcarrier signal output from DFT section 151.

  The DFT unit 151 receives a reception signal (reception signal 1 or reception signal 2) received by the corresponding antenna 128, performs DFT on the input reception signal, and converts a time domain signal into a frequency domain signal. The signal of each subcarrier is acquired by conversion. The DFT unit 151 outputs the acquired signal of each subcarrier to the adaptive array processing unit 152 and the multiplier 153.

  Adaptive array processing section 152 receives the corresponding subcarrier signal from each DFT section 151. Based on the corresponding subcarrier signal in received signal 1 and the corresponding subcarrier signal in received signal 2, adaptive array processing section 152 assigns a weight for suppressing an interference signal included in each signal to a predetermined value. It is calculated by an algorithm (PI or CMA).

  Each of the multipliers 153 is provided for each subcarrier signal output from each DFT section 151, and the corresponding subcarrier signal and the weight calculated by the corresponding subcarrier adaptive array processing section 152 are provided. Entered. Multiplier 153 multiplies the input subcarrier signal and the weight, and outputs the multiplication result to corresponding subcarrier adder 154. Each adder 154 adds the multiplication results output from the corresponding subcarrier multiplier 153, and inputs the addition result to the parallel / serial converter 155. In this way, a signal of each subcarrier in which an interference signal is suppressed is obtained by array processing including multiplication and combination of weights.

  The parallel / serial converter 155 inputs the signal of each subcarrier that has been subjected to the array processing from each adder 154, performs parallel / serial conversion on the input signal of each subcarrier, The signal is acquired, and the acquired one system signal is output to the demodulator 156. Demodulation section 156 extracts symbols demapped by orthogonal demodulation processing from one system of signals output from parallel / serial conversion section 155, and finally performs error correction decoding processing on the extracted symbols. The correct data series. Demodulation section 156 outputs the acquired data series to MAC layer processing section 122.

  Here, the configuration for performing the array processing for each subcarrier has been described using the case where the adaptive array processing unit 152, the multiplier 153, and the adder 154 are provided for each subcarrier. However, the present processing is not limited to this example. It can be implemented. For example, the received signal processing unit 124 includes the adaptive array processing unit 152, the multiplier 153, and the adder 154 one by one or a number smaller than the number of subcarriers, and performs array processing for each subcarrier in a time division manner. It does not matter as a configuration. A plurality of subcarriers may be combined into one subchannel, and the above array processing may be performed on a subchannel basis. In this way, array processing in OFDM (multi-carrier transmission) can be realized using any method.

  In the example of FIGS. 18 and 19, the case where there are two receiving antennas has been described as an example, but the number of antennas may be three or more. In general, when the number of antennas is N, N-1 interference waves can be suppressed by applying an adaptive array.

  The wireless communication apparatus 120 configured as described above uses the PI or CMA algorithm to communicate in the wireless communication system even in a situation where an incoming interference signal cannot be predicted without using a known signal such as a training signal. It can be performed.

Nobuyoshi Kikuma, “Adaptive Antenna Technology”, Ohm, October 2003

  However, these algorithms have the feature that PI works when the Signal to Interference power Ratio (SIR) is less than 0, while CMA works when the SIR is greater than 0. It has features and their operating area is limited. Also in MMSE, when the SIR is small, a sufficient interference suppression effect cannot be obtained. Therefore, there is a problem that in the situation where the SIR is near 0, the interference suppression effect by the adaptive array algorithm cannot be obtained with certainty.

  The present invention has been made in view of such circumstances, and provides a wireless communication system, a wireless communication apparatus, and a wireless communication method capable of extending the operation area of the adaptive array algorithm and improving the interference suppression effect. With the goal.

  The present invention is a wireless communication system including a wireless communication device to which an adaptive array antenna is applied in order to cope with channel interference, and the wireless communication device that performs signal transmission transmits a transmission signal after modulation processing to a plurality of bands. A first band dividing unit that divides, a power allocating unit that allocates power so that there is a difference in height in power allocated between the bands when allocating power to each of the transmission signals of the divided bands, A transmission unit that synthesizes and transmits a transmission signal of a band, and the wireless communication device that performs signal reception includes: a reception unit that receives a signal transmitted from the wireless communication device that performs signal transmission as a reception signal; A second band dividing means for dividing the received signal into a plurality of bands and an array antenna process for each of the divided received signals in the bands And an array processing means for performing array antenna processing by applying an array processing weight of a band with good reception quality, and a demodulation means for synthesizing the received signals of each band after the array antenna processing and performing demodulation processing. It is characterized by.

  In the present invention, when the wireless communication device on the transmission side detects that the reception on the wireless communication device on the reception side has failed, when the power is allocated, the wireless communication device changes the difference in power level allocated between the bands. The power allocation is performed.

  The present invention is characterized in that, when the weight calculated at the time of reception is used at the time of transmission, the wireless communication apparatus selects an optimum weight and allocates the power using the selected weight.

  The present invention is characterized in that the wireless communication apparatus performs communication using single carrier communication.

  The present invention is characterized in that the wireless communication apparatus performs communication using a multicarrier transmission scheme.

  The present invention is a wireless communication apparatus to which an adaptive array antenna is applied in order to cope with channel interference, a band dividing unit for dividing a transmission signal after modulation processing into a plurality of bands, and a transmission signal in each of the divided bands Power allocating means for allocating power so that there is a difference in height in the power allocated between the bands when allocating power to the transmission band, and transmission means for combining and transmitting the transmission signals of each band after the power allocation. And

  The present invention is a wireless communication apparatus to which an adaptive array antenna is applied in order to cope with channel interference, and a signal transmitted with power allocated so that there is a difference in height between the power allocated between the bands is used as a received signal. A receiving means for receiving, a band dividing means for dividing the received signal into a plurality of bands, and an array antenna process for each of the divided received signals of the bands, an array processing weight of a band with good reception quality is set. It is characterized by comprising array processing means for applying array antenna processing and demodulating means for synthesizing received signals of respective bands after the array antenna processing and performing demodulation processing.

  The present invention is a wireless communication method in a wireless communication system including a wireless communication apparatus to which an adaptive array antenna is applied to cope with channel interference, and a first band that divides a transmission signal after modulation processing into a plurality of bands A dividing step, a power allocating step for allocating power so that a difference in height is assigned to the power allocated between the bands when allocating power to each of the divided transmission signals of the band, and a transmission signal of each band after the power allocation A transmitting step for transmitting the received signal, a receiving step for receiving the transmitted signal as a received signal, a second band dividing step for dividing the received signal into a plurality of bands, and a received signal in the divided band When performing array antenna processing, apply array processing weights with good reception quality to the array antenna. An array processing step of performing a physical, synthesizes the received signal of each band after the array antenna processing, and having a demodulation step for demodulating process.

  According to the present invention, the transmission side divides the band into a predetermined number, assigns different power densities to each of them, and performs transmission with a difference in power density on the frequency axis, and the reception side differs for each band. By applying weights by adaptive array processing according to SIR, the operation area of the adaptive array algorithm can be expanded, and the effect of improving the interference suppression effect can be obtained.

It is a block diagram which shows the structure of the transmission signal process part 126 by 1st Embodiment of this invention. It is a block diagram which shows the structure of the received signal process part 124 by 1st Embodiment. 3 is a flowchart showing a transmission operation of a transmission signal processing unit 126 shown in FIG. 1 and a reception operation of a reception signal processing unit 124 shown in FIG. It is a figure which shows an example of allocation of a zone | band and a power density. It is a sequence diagram which shows the control sequence of the radio | wireless communication apparatus 120a of a transmission side, and the radio | wireless communication apparatus 120b of a reception side. It is a block diagram which shows the structure of the transmission signal process part 126 by 2nd Embodiment. It is a block diagram which shows the structure of the received signal process part 124 by 2nd Embodiment. 8 is a flowchart showing a transmission operation of a transmission signal processing unit 126 shown in FIG. 6 and a reception operation of a reception signal processing unit 124 shown in FIG. It is a sequence diagram which shows the control sequence of the radio | wireless communication apparatus 120a of a transmission side, and the radio | wireless communication apparatus 120b of a reception side. It is a block diagram which shows the structure of the radio | wireless communications system in 3rd Embodiment. It is a block diagram which shows the structure of the transmission signal process part 126 shown in FIG. 12 is a flowchart illustrating a transmission operation of the transmission signal processing unit 126 illustrated in FIG. 11. It is a block diagram which shows the structure of the transmission signal process part 126 by 4th Embodiment. It is a flowchart which shows the transmission operation | movement of the transmission signal process part 126 shown in FIG. It is a block diagram which shows the structural example of a radio | wireless communications system. It is a block diagram which shows the structural example of the transmission signal process part 126 when the radio | wireless communication apparatus 120 performs single carrier communication. It is a block diagram which shows the structural example of the transmission signal process part 126 when the radio | wireless communication apparatus 120 communicates using an OFDM modulation system or an OFDMA modulation system. It is a block diagram which shows the structural example of the received signal process part 124 when the radio | wireless communication apparatus 120 performs single carrier communication. It is a block diagram which shows the structure of the received signal process part 124 when the radio | wireless communication apparatus 120 communicates using an OFDM modulation system or an OFDMA modulation system.

<First Embodiment>
Hereinafter, a wireless communication system (wireless communication system) including a wireless communication device according to a first embodiment of the present invention will be described with reference to the drawings. Since the configuration of the wireless communication system in the embodiment is the same as the configuration shown in FIG. 15, detailed description thereof is omitted here. The wireless communication system according to the first embodiment performs single carrier communication. The wireless communication system according to the embodiment is different from the conventional wireless communication system in that the configurations of the transmission signal processing unit 126 and the reception signal processing unit 124 are different. FIG. 1 is a block diagram showing the configuration of the transmission signal processing unit 126 according to the embodiment. In this figure, the same reference numerals are given to the same parts as those of the conventional wireless communication system, and the description thereof will be briefly given.

  In FIG. 1, reference numeral 131 denotes a modulation unit that performs coding processing and primary modulation by performing symbol mapping processing after performing error correction coding processing on data output from the MAC layer processing unit 122. It is. Reference numeral 134 denotes a filter that divides the transmission signal output from the modulation unit 131 into subchannels. The number of filters 134 is the same as the number of subchannels. Reference numeral 135 denotes a power allocation unit that allocates different power to each sub-channel transmission signal output by each filter. The same number of power allocation units 135 as the number of filters 134 are provided. Reference numeral 136 denotes a signal combining unit that re-synthesizes the divided spectrum by combining the transmission signals after power allocation output from each power allocation unit 135.

  Next, the configuration of the reception signal processing unit 124 according to the first embodiment will be described with reference to FIG. FIG. 2 is a block diagram illustrating a configuration of the reception signal processing unit 124. In FIG. 2, reference numeral 157 denotes a filter that divides the received signals 1 and 2 received via the antenna 128 into signals for each subchannel. The same number of filters 157 as the number of subchannels are provided for each received signal. Here, an example of two reception signals is shown, but in the case of three or more reception signals, the reception signal processing unit 124 has the same number of similar configurations as the number of reception signals.

  Reference numeral 158 denotes an array processing control unit that selects an array process to be applied to each subchannel and instructs each adaptive array processing unit 152 to execute the selected array process. Adaptive array processing section 152 is provided in the same number as the number of subchannels, calculates weights for each of the two received signals of each subchannel, and performs array processing by multiplying the weights by multiplier 153. The multiplier 153 can perform multiplication by applying the weight output from the adaptive array processing unit 152 of another subchannel. Thereby, the array processing weight of the band having the best reception quality (accurately received) can be applied to other bands. Then, the adder 154 adds the received signal 1 and the received signal 2 for each subchannel and outputs the result. Reference numeral 159 denotes a signal combining unit that combines the received signals output from the adders 154 to re-synthesize the divided spectrum and perform power equalization processing of each subchannel. The output of the signal synthesis unit 159 is demodulated by the demodulation unit 156.

  Next, the transmission / reception operation will be described with reference to FIG. 3 is a flowchart showing the transmission operation of the transmission signal processing unit 126 shown in FIG. 1 and the reception operation of the reception signal processing unit 124 shown in FIG. First, the modulation unit 131 performs encoding / modulation processing on transmission data, and outputs a transmission signal to each filter 134 (step S1). Each of the filters 134 divides the transmission signal into sub-channel bands and outputs them (step S2).

  Next, each of the power allocation unit 135 allocates and outputs power to the transmission signal for each subchannel output from the filter 134 (step S3). Receiving this, the signal combining unit 136 combines the divided signals by combining the transmission signals after power allocation output from each of the power allocation units 135 (step S4). Then, the transmission signal processing unit 126 performs transmission processing via the antenna 128 (step S5).

  Next, the reception signal processing unit 124 receives a transmission signal via the antenna 128 (step S11). Each of the filters 157 divides the received signals 1 and 2 received by the two antennas 128 into sub-channel bands and outputs them (step S12). The array processing control unit 158 selects the array processing to be applied for each subchannel, and instructs the adaptive array processing unit 152 to execute the selected array processing.

  In response to this, the adaptive array processing unit 152 that performs adaptive array processing on the first band (band 1) receives the reception signal output from the filter 157, and performs array processing based on an instruction from the array processing control unit 158. To determine the weights, and output the determined weights to all the multipliers 153 (including multipliers in other bands). Each of the multipliers 153 receives the first received signal output from each of the filters 157. Is multiplied by the weight of the band (step S131). The adder 154 adds two received signals for each subchannel and outputs the result. In response to this, the signal synthesizer 159 synthesizes the signals output from the adder 154, and synthesizes and outputs the divided signals again while performing processing so that the power density is uniform (step S141). Subsequently, the demodulator 156 receives the reception signal output from the signal synthesizer 159, and performs demodulation processing and decoding processing (step S151).

  Next, the adaptive array processing unit 152 that performs adaptive array processing on the second band (band 2) receives the reception signal output from the filter 157, and performs array processing based on an instruction from the array processing control unit 158. The weight is determined, and the determined weight is output to all the multipliers 153 (including multipliers in other bands), and each of the multipliers 153 outputs the second band to the reception signal output from each of the filters 157. (Step S132). The adder 154 adds two received signals for each subchannel and outputs the result. In response to this, the signal synthesizer 159 synthesizes the signals output from the adder 154, and synthesizes and outputs the divided signals again while performing processing so that the power density is uniform (step S142). Subsequently, the demodulation unit 156 receives the reception signal output from the signal synthesis unit 159, and performs demodulation processing and decoding processing (step S152).

  Next, similarly, an adaptive array processing unit 152 that performs adaptive array processing on the Nth band (band N) (where N is the number of bands) receives the reception signal output from the filter 157 and performs array processing control. Weights are determined based on an instruction from unit 158, and the determined weights are output to all multipliers 153 (including multipliers in other bands), and each of multipliers 153 is output from each of filters 157. The signal is multiplied by the weight of the second band (step S133). The adder 154 adds two received signals for each subchannel and outputs the result. In response to this, the signal synthesizer 159 synthesizes the signals output from the adder 154, and again synthesizes and outputs the divided signals while performing processing so that the power density is uniform (step S143). Subsequently, the demodulation unit 156 receives the reception signal output from the signal synthesis unit 159, and performs demodulation processing and decoding processing (step S153).

  Finally, the demodulator 156 selects and outputs the signal with the best reception quality among the signals obtained by the N demodulation / decoding processes.

Here, with reference to FIG. 4, the process which allocates electric power for every zone | band shown in FIG. 3 is demonstrated. FIG. 4 is a diagram illustrating an example of bandwidth and power density allocation. Bandwidth and power density allocation is assigned with an allocation pattern No. Every, defined relationships band B _N and power density P _N of each band 1 to band N in advance, and is stored in the transmission signal processing unit 126. For example, assignment pattern No. Is (1), band 1 is assigned band B ₁ = 0.5 and power density P ₁ = 1, and band 2 is assigned band B ₂ = 0.5 and power density P ₂ = 1. Assigned. At this time, the band B _n and the power density P _n satisfy Σ ^N _{n = 1} B _n = 1 and Σ ^N _{n = 1} P _n B _n = 1. In the example shown in FIG. 4, the allocation patterns (1) to (M) are shown, but the number of patterns defined in advance is arbitrary.

Next, the bandwidth and power density allocation control operation will be described with reference to FIG. FIG. 5 is a sequence diagram illustrating a control sequence of the wireless communication device 120a on the transmission side and the wireless communication device 120b on the reception side. In the description of FIG. 5, the wireless communication device 120a on the transmission side is referred to as the transmission side, and the wireless communication device 120b on the reception side is referred to as the reception side. First, the transmission side transmits to the reception side with an allocation pattern (2) (step S21). As shown in FIG. 5A, the transmission of the allocation pattern (2) transmitted here has a power density at frequencies f _{2 to} f ₃ so that the power density becomes small at frequencies f _{1 to} f _2. Send to increase. In response to this, the reception side performs reception processing with the allocation pattern (2), and applies PI at frequencies f _{1 to} f _{2 and} CMA at frequencies f _{2 to} f ₃ . At this time, if there is no clear difference between the desired signal and the interference signal, that is, if the SIR is almost 0, the PI and CMA cannot operate properly and reception fails. If the reception side fails in reception, the reception side notifies the transmission side of reception failure (step S22).

When a notification of reception failure is detected (NACK reception or timeout occurs from the reception side), the transmission side changes the different power allocation pattern and performs transmission again. The transmission side changes the allocation pattern to (3) and transmits again (step S23). As shown in FIG. 5B, the transmission of the allocation pattern (3) transmitted here is performed at the frequency f ₂ so that the power density is smaller at the frequencies f _{1 to} f ₂ than the allocation pattern (2). further power density than the ~f ₃ allocation pattern (2) is transmitted so as to increase. As a result, when there is a clear difference between the desired signal and the interference signal, the PI and the CMA operate appropriately. In response to this, the reception side performs reception processing with the allocation pattern (3), whereby reception is successful.

  Note that the receiving side may designate an optimal allocation pattern from the receiving side to the transmitting side according to the reception result. That is, a notification is sent from the receiving side to transmit with the allocation pattern (4), and in response to this, the transmitting side performs transmission with the allocation pattern (4) and at the same time applies an array process suitable for the allocation pattern. .

In this way, the transmission side divides the band into N, performs transmission by assigning different power densities to each, and provides a large difference in power density on the frequency axis, so that SIR> 0, SIR < A band of 0 can be obtained. Weight With this, on the receiving side, PI can be applied in the band of frequencies f _{1 to} f ₂ where SIR <0. In addition, CMA can be applied in a band of frequencies f _{2 to} f ₃ where SIR> 0. Therefore, the interference suppression effect can be sufficiently obtained. Further, the adaptive array algorithm applied for each frequency band is not limited to PI and CMA, and any algorithm may be applied. For example, MMSE may be applied in a frequency band where SIR> 0.

Second Embodiment
Next, a wireless communication system (wireless communication system) including the wireless communication device according to the second embodiment of the present invention will be described. The configuration of the wireless communication system according to the second embodiment is also the same as the configuration shown in FIG. 15, and thus detailed description thereof is omitted here. The wireless communication system according to the second embodiment performs communication using multicarrier transmission. As an example, a case where communication is performed using an OFDM modulation scheme or an OFDMA modulation scheme will be described. The wireless communication system according to the embodiment is different from the conventional wireless communication system in that the configurations of the transmission signal processing unit 126 and the reception signal processing unit 124 are different. FIG. 6 is a block diagram showing a configuration of the transmission signal processing unit 126 according to the embodiment. In this figure, the same reference numerals are given to the same parts as those of the conventional wireless communication system, and the description thereof will be briefly given. The transmission signal processing unit 126 illustrated in FIG. 6 includes power allocation units 135 that allocate different power for each subcarrier between the serial / parallel conversion unit 132 and the IDFT unit 133 as many as the number of subcarriers.

  In FIG. 6, reference numeral 131 denotes a modulation unit that performs symbol mapping processing after performing error correction coding processing on data output from the MAC layer processing unit 122. Reference numeral 132 denotes a serial / parallel converter that performs serial / parallel conversion on the symbols mapped by the modulator 131 and outputs a plurality of obtained symbol strings. Reference numeral 135 denotes a power allocation unit that allocates different power to each of the plurality of symbols output from the serial / parallel conversion unit 132. Reference numeral 133 denotes an IDFT unit that performs IDFT on the symbol sequence after power allocation output from each power allocation unit 135, converts the signal in the frequency domain into a signal in the time domain, and outputs the signal to the antenna 128.

  Next, the configuration of the reception signal processing unit 124 according to the second embodiment will be described with reference to FIG. FIG. 7 is a block diagram illustrating a configuration of the reception signal processing unit 124. In this figure, the same reference numerals are given to the same parts as those of the conventional wireless communication system, and the description thereof will be briefly given. The reception signal processing unit 124 shown in FIG. 7 is different from the reception signal processing unit 124 shown in FIG. 19 in that an array processing control unit 158 is provided. 7 includes a DFT unit 151, a plurality of adaptive array processing units 152, a plurality of multipliers 153, a plurality of adders 154, a parallel / serial conversion unit 155, and a demodulation unit 156. And. The DFT unit 151 is provided corresponding to the antenna 128. An adaptive array processor 152 and an adder 154 are provided for each subcarrier. Multiplier 153 is provided for each subcarrier signal output from DFT section 151. The array processing control unit 158 selects the array processing to be applied for each subcarrier, and instructs the adaptive array processing unit 152 to execute the selected array processing.

  Next, the transmission / reception operation will be described with reference to FIG. FIG. 8 is a flowchart showing the transmission operation of the transmission signal processing unit 126 shown in FIG. 6 and the reception operation of the reception signal processing unit 124 shown in FIG. First, the modulation unit 131 performs encoding / modulation processing on the transmission data and outputs the transmission signal to the serial / parallel conversion unit 132 (step S31). The serial / parallel converter 132 converts the transmission signal from serial to parallel to divide it into subcarrier bands and outputs it (step S32). Each of the power allocation unit 135 allocates and outputs power to the transmission signal for each subcarrier output from the serial / parallel conversion unit 132 (step S33). In response to this, the IDFT unit 133 performs IDFT processing on the transmission signal after power allocation output from each of the power allocation unit 135 and outputs the transmission signal (step S24). Then, the transmission signal processing unit 126 performs transmission processing via the antenna 128 (step S35).

  Next, the reception signal processing unit 124 receives a transmission signal via the antenna 128 (step S41). Each of the DFT units 151 divides the received signals 1 and 2 received by the two antennas 128 into subcarrier bands by performing DFT processing on the received signals 1 and 2 (step S42). The array processing control unit 158 selects the array processing to be applied for each subcarrier, and instructs the adaptive array processing unit 152 to execute the selected array processing.

  In response to this, the adaptive array processing unit 152 that performs adaptive array processing on the first band (band 1) receives the reception signal output from the DFT unit 151, and waits based on an instruction from the array processing control unit 158. And the received signal output from the DFT unit 151 is multiplied by all the multipliers 153 (including multipliers in other bands) (step S431). Adder 154 adds two received signals for each subcarrier and outputs the result. In response, the parallel / serial converter 155 performs parallel / serial conversion on the signals output from the adders 154, thereby outputting the signals in a predetermined order (step S441). Subsequently, the demodulation unit 156 receives the reception signal output from the parallel / serial conversion unit 155, and performs demodulation processing and decoding processing (step S451).

  Next, the adaptive array processing unit 152 that performs adaptive array processing on the second band (band 2) receives the reception signal output from the DFT unit 151, and performs array processing based on an instruction from the array processing control unit 158. The weight is determined, and the received signal output from the DFT unit 151 is multiplied by all the multipliers 153 (including multipliers in other bands) (step S432). Adder 154 adds two received signals for each subcarrier and outputs the result. In response, the parallel / serial converter 155 performs parallel / serial conversion on the signals output from the adders 154, thereby outputting the signals in a predetermined order (step S442). Subsequently, the demodulation unit 156 receives the reception signal output from the parallel / serial conversion unit 155, and performs demodulation processing and decoding processing (step S452).

  Next, similarly, an adaptive array processing unit 152 that performs adaptive array processing on the Nth band (band N) (where N is the number of bands) receives the reception signal output from the DFT unit 151 and performs array processing. A weight is determined based on an instruction from the control unit 158, and the received signal output from the DFT unit 151 is multiplied by all the multipliers 153 (including multipliers in other bands) (step S433). Adder 154 adds two received signals for each subcarrier and outputs the result. In response to this, the parallel / serial converter 155 performs parallel / serial conversion on the signals output from the adders 154, thereby outputting the signals in a predetermined order (step S443). Subsequently, the demodulation unit 156 receives the reception signal output from the parallel / serial conversion unit 155, and performs demodulation processing and decoding processing (step S453).

  Finally, the demodulator 156 selects and outputs the signal with the best reception quality among the signals obtained by the N demodulation / decoding processes.

  Next, the bandwidth and power density allocation control operation will be described with reference to FIG. FIG. 9 is a sequence diagram illustrating a control sequence of the wireless communication device 120a on the transmission side and the wireless communication device 120b on the reception side. In the description of FIG. 9, the wireless communication device 120a on the transmission side is referred to as the transmission side, and the wireless communication device 120b on the reception side is referred to as the reception side.

In the transmission signal processing unit 126 on the transmission side, as shown in FIG. Every relationship bandwidth B _N and power density P _N of each band 1 to band N are stored are predefined. The band referred to here is regarded as a set of subcarriers (subchannel) to which a predetermined power density is allocated, and the subcarrier number may be arbitrarily set.

  First, the transmission side transmits to the reception side with an allocation pattern (2) (step S51). The transmission of the allocation pattern (2) transmitted here is performed with the allocation pattern shown in FIG. In response to this, the reception side performs reception processing with the allocation pattern (2). At this time, if the reception side fails in reception, the reception side notifies the transmission side of reception failure (step S52).

  When the notification of reception failure is detected, the transmission side changes the different power allocation pattern and transmits again. The transmission side changes the allocation pattern to (3) and transmits again (step S23). As shown in FIG. 5B, the transmission of the allocation pattern (3) transmitted here is performed so that the power density is further reduced in the band having a lower power density than in the allocation pattern (2). A band with a large is transmitted so that the power density is further increased. As a result, when there is a clear difference between the desired signal and the interference signal, the PI and the CMA operate appropriately. In response to this, the reception side performs reception processing with the allocation pattern (3), whereby reception is successful.

  Note that the receiving side may designate an optimal allocation pattern from the receiving side to the transmitting side according to the reception result. That is, a notification is sent from the receiving side to transmit with the allocation pattern (5), and upon receiving this, the transmitting side performs transmission with the allocation pattern (5), and at the same time applies an array process suitable for the allocation pattern. .

  In this way, the transmission side divides the band into N, and assigns different power densities to each of the transmissions, so that the reception side can obtain bands with SIR> 0 and SIR <0. Weight This allows the receiving side to apply PI in a band where SIR <0. Further, CMA can be applied in a band where SIR> 0. Therefore, the interference suppression effect can be sufficiently obtained. Further, the adaptive array algorithm applied for each frequency band is not limited to PI and CMA, and any algorithm may be applied. For example, MMSE may be applied in a frequency band where SIR> 0.

<Third Embodiment>
Next, a wireless communication system (wireless communication system) including the wireless communication device according to the third embodiment of the present invention will be described. The wireless communication system according to the third embodiment performs single carrier communication. FIG. 10 is a block diagram showing the configuration of the wireless communication system in the embodiment. In this figure, the same parts as those in the wireless communication system shown in FIG. The wireless communication system shown in FIG. 10 is different from the wireless communication system shown in FIG. 15 in that a weight management unit 125 is newly provided and the configuration of the transmission signal processing unit 126 is different. The weight management unit 125 suppresses the interference to the interference source by using the weight calculated at the time of reception at the time of transmission.

  Next, the configuration of the transmission signal processing unit 126 shown in FIG. 10 will be described with reference to FIG. FIG. 11 is a block diagram showing a configuration of transmission signal processing section 126 shown in FIG. In FIG. 11, reference numeral 131 denotes a modulation unit that performs coding processing and primary modulation by performing symbol mapping processing after performing error correction coding processing on data output from the MAC layer processing unit 122. It is. The number of modulation units 131 is the same as the number of data to be transmitted (transmission data 1 and 2 in the example in the figure). Reference numeral 134 denotes a filter that divides the transmission signal output from the modulation unit 131 into subchannels. The number of filters 134 is the same as the number of subchannels.

  Reference numeral 137 denotes a multiplier that multiplies the transmission signal of the subchannel output from each filter 134 by the weight instructed by the weight management unit 125. The same number of multipliers 137 as the number of filters 134 are provided. The weight management unit 125 receives the weight calculated at the time of reception in the reception signal processing unit 124 and causes the multiplier 137 to multiply this weight. The multiplier 153 can perform multiplication by applying the weight output from the weight management unit 125 to other subchannels. Thereby, it is possible to apply the array processing weight of the band having the best reception quality (accurately received). Reference numeral 135 denotes a power allocation unit that allocates different power to each transmission signal of the subchannel multiplied by the weight output from each multiplier 137. The same number of power allocation units 135 as the number of filters 134 are provided. Reference numeral 138 denotes an adder that adds the signal of transmission data 1 and the signal of transmission data 2 for each subchannel. Reference numeral 136 denotes a signal synthesizer that re-synthesizes the divided spectrum by synthesizing the transmission signal after power allocation output from each adder 138.

  Next, the transmission operation will be described with reference to FIG. FIG. 12 is a flowchart showing the transmission operation of the transmission signal processing unit 126 shown in FIG. First, the modulation unit 131 performs encoding / modulation processing on the transmission data 1 and 2 and outputs the transmission signal to each filter 134 (step S61). Each of the filters 134 divides the transmission signal into sub-channel bands and outputs them (step S62). Subsequently, each of the multipliers 137 multiplies the transmission signal output from each filter 134 by the weight instructed by the weight management unit 125 (Step S63). At this time, the weight management unit 125 selects an optimal weight (for example, the weight of the band X, and the band X is one of the bands of the number N of bands), and the multiplier 137 To direct.

  Next, each of the power allocation units 135 allocates power to the transmission signal for each subchannel output from the multiplier 137 and outputs it (step S64). The adder 138 adds the transmission signals of the two transmission data 1 and 2 for each subchannel and outputs the result. Receiving this, the signal synthesis unit 136 synthesizes and outputs the divided signals by synthesizing the transmission signals after power allocation output from each of the addition units 138 (step S65). Then, the transmission signal processing unit 126 performs transmission processing via the antenna 128 (step S66).

  Since the reception operation is the same as the reception operation in the first embodiment, detailed description thereof is omitted here.

  As described above, PI can be applied in a frequency band where SIR <0, and CMA can be applied in a frequency band where SIR> 0, thereby suppressing interference with an interference source. A sufficient effect can be obtained. Furthermore, since the optimum weight is selected from the weights calculated at the time of reception and used at the time of transmission, interference with the interference source can be suppressed.

<Fourth embodiment>
Next, a wireless communication system (wireless communication system) including the wireless communication device according to the fourth embodiment of the present invention will be described. Since the configuration of the wireless communication system in the fourth embodiment is the same as the configuration shown in FIG. 10, detailed description thereof is omitted here. The wireless communication system according to the fourth embodiment performs communication by multicarrier transmission. As an example, a case where communication is performed using an OFDM modulation scheme or an OFDMA modulation scheme will be described. The wireless communication system according to the fourth embodiment is different from the second wireless communication system in that the configuration of the transmission signal processing unit 126 is different.

  FIG. 13 is a block diagram illustrating a configuration of the transmission signal processing unit 126 according to the fourth embodiment. In FIG. 13, a code 131 is a modulation unit that performs symbol mapping processing after performing error correction coding processing on each of transmission data 1 and 2 output from the MAC layer processing unit 122. Reference numeral 132 denotes a serial / parallel converter that performs serial / parallel conversion on the symbols mapped by each of the modulators 131 and outputs a plurality of obtained symbol strings. Reference numeral 137 denotes a multiplier that multiplies each of a plurality of symbols output from each of the two serial / parallel converters 132 by a weight instructed by the weight management unit 125. Multipliers 137 are provided in the same number as the number of symbols output from each of the two serial / parallel converters 132.

  The weight management unit 125 receives the weight calculated at the time of reception in the reception signal processing unit 124 and causes the multiplier 137 to multiply this weight. The multiplier 153 can perform multiplication by applying the weight output from the weight management unit 125 to other subchannels. Thereby, it is possible to apply the array processing weight of the band having the best reception quality (accurately received). Reference numeral 135 denotes a power allocation unit that allocates different power to each of the plurality of symbols output from the multiplier 137. Reference numeral 138 denotes an adder that adds the signal of transmission data 1 and the signal of transmission data 2 for each subchannel. Reference numeral 133 denotes an IDFT unit that performs IDFT on the symbol sequence after power allocation output from each adder 138, converts the signal in the frequency domain into a signal in the time domain, and outputs the signal to the antenna 128.

  Next, the transmission operation will be described with reference to FIG. FIG. 14 is a flowchart showing the transmission operation of the transmission signal processing unit 126 shown in FIG. First, the modulation unit 131 performs encoding / modulation processing on each of the transmission data 1 and 2 and outputs a transmission signal to the serial / parallel conversion unit 132 (step S71). The serial / parallel converter 132 converts the transmission signal of the transmission data 1 and the transmission signal of the transmission data 2 from serial to parallel so as to be divided into subcarrier bands and output (step S72). Each of the multipliers 137 multiplies the transmission signal for each subcarrier output from the serial / parallel conversion unit 132 by the weight instructed by the weight management unit 125 (step S73). At this time, the weight management unit 125 selects an optimal weight (for example, the weight of the band X, and the band X is one of the bands of the number N of bands), and the multiplier 137 To direct.

  Next, each of the power allocation unit 135 allocates power to the transmission signal for each subcarrier output from the multiplier 137 and outputs the transmission signal (step S74). The adder 138 adds the transmission signals of the two transmission data 1 and 2 for each subchannel and outputs the result. In response to this, the IDFT unit 133 performs IDFT processing on the transmission signal after power allocation output from each of the adders 138 and outputs the transmission signal (step S75). Then, the transmission signal processing unit 126 performs transmission processing via the antenna 128 (step S76).

  Since the reception operation is the same as the reception operation in the second embodiment, detailed description thereof is omitted here.

  As described above, PI can be applied in a frequency band where SIR <0, and CMA can be applied in a frequency band where SIR> 0, thereby suppressing interference with an interference source. A sufficient effect can be obtained. Furthermore, since the weight calculated at the time of reception is used at the time of transmission, the interference can be suppressed. Furthermore, since the optimum weight is selected from the weights calculated at the time of reception and used at the time of transmission, interference with the interference source can be suppressed.

  As described above, the transmission side divides the band into a predetermined number and assigns different power densities to each to provide a difference in power density on the frequency axis, and the reception side performs transmission for each band. By applying weights by adaptive array processing according to different SIRs, the operation area of the adaptive array algorithm can be expanded, and the interference suppression effect can be improved. In particular, since the array processing weight of the band having the best reception quality (accurately received) is applied on the reception side, the interference suppression effect can be sufficiently obtained.

  The wireless communication device 120 in the above-described embodiment may be realized by a computer. In that case, a program for realizing this function may be recorded on a computer-readable recording medium, and the program recorded on this recording medium may be read into a computer system and executed. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory inside a computer system serving as a server or a client in that case may be included and a program held for a certain period of time. Further, the program may be for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in the computer system. It may be realized using hardware such as PLD (Programmable Logic Device) or FPGA (Field Programmable Gate Array).

  As mentioned above, although embodiment of this invention has been described with reference to drawings, the said embodiment is only the illustration of this invention, and it is clear that this invention is not limited to the said embodiment. is there. Therefore, additions, omissions, substitutions, and other modifications of the components may be made without departing from the technical idea and scope of the present invention.

  It can be applied to applications where it is essential to expand the operation area of the adaptive array algorithm and improve the interference suppression effect.

  124: Received signal processing unit, 125 ... Weight management unit, 126 ... Transmission signal processing unit, 131 ... Modulation unit, 132 ... Serial / parallel conversion unit, 133 ... IDFT unit, 134 ... Filter, 135 ... Power allocation unit, 136 ... Signal synthesis unit, 151 ... DFT unit, 152 ... Adaptive array processing unit, 153 ... Multiplier, 154 ... Addition 155 ... Parallel / serial converter, 156 ... demodulator, 157 ... filter, 158 ... array processing controller, 159 ... signal synthesizer

Claims (8)

A wireless communication system comprising a wireless communication device to which an adaptive array antenna is applied to cope with channel interference,
The wireless communication device that performs signal transmission includes:
First band dividing means for dividing the modulated transmission signal into a plurality of bands;
Power allocating means for allocating power so that there is a difference in height in the power allocated between the bands when allocating power to each of the divided transmission signals of the band;
Transmission means for combining and transmitting transmission signals of each band after power allocation,
The wireless communication device that performs signal reception includes:
Receiving means for receiving a signal transmitted from the wireless communication device that performs signal transmission as a received signal;
Second band dividing means for dividing the received signal into a plurality of bands;
An array processing means for performing array antenna processing by applying an array processing weight of a band with good reception quality when performing array antenna processing on each of the divided reception signals of the band;
A radio communication method comprising: demodulating means for synthesizing received signals of respective bands after the array antenna processing and performing demodulation processing.   When the wireless communication device on the transmission side detects that reception in the wireless communication device on the reception side has failed, the power allocation is performed by changing a difference in power level allocated between the bands when allocating the power. The wireless communication system according to claim 1, wherein:   The radio communication apparatus according to claim 2, wherein the radio communication apparatus selects an optimum weight when using the weight calculated at the time of transmission at the time of transmission, and allocates the power using the selected weight. Communication method.   The wireless communication system according to claim 1, wherein the wireless communication device performs communication using single carrier communication.   The wireless communication system according to claim 1, wherein the wireless communication apparatus performs communication using a multicarrier transmission system. A wireless communication apparatus to which an adaptive array antenna is applied to cope with channel interference,
Band dividing means for dividing the modulated transmission signal into a plurality of bands;
Power allocating means for allocating power so that there is a difference in height in the power allocated between the bands when allocating power to each of the divided transmission signals of the band;
A wireless communication apparatus comprising: a transmission unit configured to combine and transmit transmission signals of respective bands after power allocation. A wireless communication apparatus to which an adaptive array antenna is applied to cope with channel interference,
Receiving means for receiving, as a received signal, a signal transmitted with power allocated so that a difference in height is assigned to the power allocated between the bands;
Band dividing means for dividing the received signal into a plurality of bands;
An array processing means for performing array antenna processing by applying an array processing weight of a band with good reception quality when performing array antenna processing on each of the divided reception signals of the band;
A radio communication apparatus comprising: demodulation means for synthesizing received signals of respective bands after the array antenna processing and performing demodulation processing. A wireless communication method in a wireless communication system comprising a wireless communication device to which an adaptive array antenna is applied to cope with channel interference,
A first band dividing step of dividing the modulated transmission signal into a plurality of bands;
A power allocation step of allocating power so that there is a difference in height in the power allocated between the bands when allocating power to each of the divided transmission signals of the band; and
A transmission step of combining and transmitting transmission signals of each band after power allocation;
A receiving step of receiving the transmitted signal as a received signal;
A second band dividing step of dividing the received signal into a plurality of bands;
An array processing step of performing array antenna processing by applying an array processing weight of a band with good reception quality when performing array antenna processing on each of the divided reception signals of the band;
And a demodulation step of synthesizing the reception signals of the respective bands after the array antenna processing and performing demodulation processing.

Images