JP2009055179A - Transmitter, program and transmission method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transmitter capable of reducing a load of a power supply unit of the transmitter in transmitting signals to a receiver, and to provide a program and a transmission method. <P>SOLUTION: The transmitter having a plurality of antennas for communication with the receiver is provided with: a determination section for determining whether or not the timing of a peak of the power transmission of signals transmitted from the antennas to the transmitter matches; and a control section in which, when the determination means determines that the generation timing matches, the transmission power of signals transmitted from at least one antenna of the plurality of antennas to the receiver is made smaller than the transmission power of signals transmitted from the one antenna to the receiver when the determination section determines that the generating timing does not match. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a transmission device, a program, and a transmission method, and more particularly to a transmission device, a program, and a transmission method that transmit signals using a plurality of antennas.

  In a communication device in a multicarrier transmission system, as the communication speed increases and the amount of data communication increases, the PAPR (Peak to Average Power Ratio) of the transmission power amplification unit used in the transmission circuit of the communication device: peak power to average transmission power ratio ) Becomes larger. For this reason, problems such as inter-subcarrier interference problems and power leakage outside the band due to distortion due to nonlinear characteristics of the transmission power amplifier occur. As a countermeasure, if a wide area (back-off area) for ensuring the linearity of the transmission power amplifying unit is ensured, current consumption increases.

As a countermeasure against PAPR, when the power amplifier that amplifies the transmission signal approaches the nonlinear region, the peak power of the transmission signal is reduced in consideration of the peak power reduction due to clipping and the adjacent channel leakage power due to the filter (Patent Literature). 1).
Further, when used in the linear region of the transmission power amplifier, the signal is transmitted as it is without passing through the filter in order to ensure the data communication quality, so that the change in the current consumption of the transmission power amplifier increases.
JP 2002-44054 A

  In the conventional technology, regardless of the linear and nonlinear regions of the transmission power amplification unit, when transmitting using multiple antennas, the peak power of the transmission power of each antenna is generated in each antenna. When the peak powers of the antennas overlap or occur at close timings, the current consumption of each transmission power amplification unit increases, so the current consumption of the entire communication device temporarily increases, and the communication device The load of the battery provided increases.

In addition, in order to secure a margin for the power supply circuit capability from the battery included in the communication device to the transmission power amplification unit, it is necessary to increase the scale of the power supply circuit in consideration of the occurrence of peak power overlapping timing. There is.
Also, when peak power overlaps with a plurality of antennas, the amount of interference with each other's antennas suddenly increases, greatly affecting communication quality.
When transmitting from multiple antennas than when transmitting from one antenna, the frequency of peak power increases in proportion to the number of antennas, and the peak power output from each antenna The frequency with which the occurrence timings overlap increases.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a transmission device, a program, and a transmission method that can reduce the load on the power supply of the transmission device when transmitting a signal to the reception device. There is.

(1) The present invention has been made to solve the above problems, and a transmission device according to an aspect of the present invention is a transmission device including a plurality of antennas that communicate with a reception device, and receives the reception from each antenna. A determination unit that determines whether or not the generation timings of transmission power peaks of signals to be transmitted to the device match, and at least one antenna of the plurality of antennas when the determination unit determines that the generation timings match A control unit that reduces the transmission power of the signal transmitted from the antenna to the reception device when the determination unit determines that the generation timing does not match the transmission power of the signal transmitted from the antenna to the reception device. Prepare.
In the present invention, when the determination unit determines that the generation timings of the transmission power peaks of the signals transmitted from the respective antennas to the receiving device match, the transmission power of the signals transmitted from at least one of the plurality of antennas to the receiving device. When the determination unit determines that the generation timing does not match, the control unit controls the transmission power to be smaller than the transmission power of the signal transmitted from the antenna to the reception device. Even when power peaks occur at the same generation timing, it is possible to prevent an excessive load from being applied to the power supply of the transmission apparatus.

(2) In addition, a transmission device according to an aspect of the present invention includes a filter unit that filters a signal transmitted from each antenna to the reception device, and the control unit determines that the transmission power peak generation timing matches. When the determination unit determines that the generation timing does not match the filter coefficient used for filtering of the filter unit with respect to a signal transmitted from at least one of the plurality of antennas to the receiving device Of the filter coefficient used for filtering of the filter unit with respect to the signal transmitted from the antenna to the receiving device.
In the present invention, when the generation timings of the transmission power peaks of the signals transmitted from the respective antennas to the reception device match, the filter coefficients used for the signals transmitted from at least one of the plurality of antennas to the reception device are generated. Since the control unit controls so as to be larger than the filter coefficient used for the signal transmitted from the antenna to the receiving device when they do not match, the peak of the transmission power of the signals transmitted from the plurality of transmission antennas has the same occurrence timing. Even if it occurs, it is possible to use a communication method with a large filter coefficient for a signal transmitted from the antenna to the receiving device, that is, a low power consumption, and an excessive load is applied to the power supply of the transmitting device. Can be prevented.

(3) In addition, a transmission device according to an aspect of the present invention includes a modulation unit that modulates a signal to be transmitted from each antenna to the reception device, and the control unit determines that the transmission power peak generation timings coincide with each other. If the generation timing does not match the multi-value number of the modulation scheme applied by the modulation unit to the signal transmitted from at least one of the plurality of antennas to the reception device when the generation unit does not match the determination unit Is smaller than the multi-level number of the modulation scheme applied by the modulation unit to the signal transmitted from the antenna to the receiving device.
In the present invention, when the determination unit determines that the generation timings of the transmission power peaks of the signals transmitted from the respective antennas to the reception device match, the modulation unit of the signal transmitted from at least one of the plurality of antennas to the reception device When the determination unit determines that the generation timing does not match, the multi-level number of the modulation scheme applied by the is set to be smaller than the multi-level number of the modulation scheme applied by the modulation unit to the signal transmitted from the antenna to the receiving device. Therefore, even if the transmission power peaks of signals transmitted from a plurality of transmission antennas occur at the same occurrence timing, the modulation scheme of a signal transmitted from the antennas to the receiving device is a multi-valued number. A small modulation method that consumes less power can be used, and an excessive load can be prevented from being applied to the power supply of the transmission apparatus.

(4) In addition, the transmission device according to an aspect of the present invention includes a subcarrier arrangement unit that arranges a signal to be transmitted from each antenna to the reception device on a subcarrier, and the control unit generates a transmission power peak generation timing. If the generation unit does not match the subcarrier interval arranged by the subcarrier arrangement unit of the signal transmitted to the receiving device of at least one of the plurality of antennas The signal is transmitted from the antenna to the receiving device when the determination unit determines, and is increased with respect to the subcarrier interval arranged by the subcarrier arrangement unit.
In the present invention, when the generation timings of the transmission power peaks of the signals transmitted from the respective antennas to the receiving device coincide with each other, the interval at which the signal transmitted from at least one of the plurality of antennas to the receiving device is arranged on the subcarrier is set. When the generation timing does not match, the control unit controls the signal transmitted from the antenna to the receiving device to be larger than the interval at which the signal is arranged on the subcarrier. Can be used for a signal transmitted from the antenna to the receiving apparatus with a large interval between subcarriers, that is, a communication method with low power consumption. It is possible to prevent an excessive load from being applied to the power source.

(5) In addition, the transmission device according to one aspect of the present invention includes a Fourier transform unit that performs Fourier transform on a signal transmitted from each antenna to the reception device, and the control unit has a transmission power peak generation timing. When the determination unit determines that they match, the generation timing matches the size or sampling frequency of the Fourier transform applied by the Fourier transform unit of the signal transmitted from at least one of the plurality of antennas to the receiving device. Otherwise, the size of the Fourier transform applied by the Fourier transform unit to the signal transmitted from the antenna to the receiving device when the determination unit determines is smaller than the sampling frequency.
Further, in the present invention, when the transmission power peak generation timing of the signal transmitted from each antenna to the receiving device matches, the Fourier transform applied to the signal transmitted from at least one of the plurality of antennas to the receiving device. Since the control unit controls the size or sampling frequency to be smaller than the size or sampling frequency of the Fourier transform applied to the signal transmitted from the antenna to the receiving device when the generation timing does not match, from the plurality of transmitting antennas Even when the peak of transmission power of a signal to be transmitted occurs at the same generation timing, a Fourier transform having a small size or sampling frequency can be applied to a signal transmitted from the antenna to the receiving device. Therefore, since the generation timing of the signal transmitted from the at least one antenna to the receiving device and the signal transmitted from the other antenna to the receiving device can be shifted, it is possible to prevent multiple peaks from overlapping at the same generation timing. It is possible to prevent an excessive load from being applied to the power supply of the transmission apparatus.

(6) In addition, a transmission device according to an aspect of the present invention includes a transmission power amplification unit that amplifies transmission power of a signal transmitted from each antenna to the reception device, and the control unit generates a transmission power peak generation timing. If the generation unit does not match the amplification factor of the transmission power amplification unit with respect to a signal transmitted from at least one of the plurality of antennas to the reception device, the determination unit Is determined to be smaller than the amplification factor of the transmission power amplifying unit for the signal transmitted from the antenna to the receiving device.
In the present invention, when the generation timings of the transmission power peaks of the signals transmitted from the respective antennas to the reception device coincide with each other, the generation timing indicates the amplification factor for the signal transmitted from at least one of the plurality of antennas to the reception device. The control unit controls the gain to be smaller than the amplification factor for the signal transmitted from the antenna to the receiving device when they do not match, so the peak of the transmission power of the signals transmitted from the plurality of transmission antennas occurs at the same occurrence timing. Even in such a case, it is possible to use a communication method having a small amplification factor for a signal transmitted from the antenna to the receiving device, that is, low power consumption, and preventing an excessive load from being applied to the power source of the transmitting device. it can.

(7) In addition, a transmission device according to an aspect of the present invention includes a storage unit that stores a signal to be transmitted from each antenna to the reception device, and the determination unit determines that the transmission power peak generation timings coincide with each other. A signal transmitted from at least one of the plurality of antennas to the receiving device is recorded in the storage unit, and a transmission power of a signal transmitted from the plurality of antennas to the receiving device is predetermined. When the value is equal to or lower than the threshold, the signal recorded in the storage unit is transmitted from the antenna to the receiving device.
In the present invention, when the generation timings of the transmission power peaks of the signals transmitted from the respective antennas to the receiving device coincide with each other, the signals transmitted from at least one of the plurality of antennas to the receiving device are recorded in the storage unit, The control unit controls the signal recorded in the storage unit to be transmitted from the at least one antenna to the receiving device when the transmission power of the signal transmitted from the antenna to the receiving device is equal to or less than a predetermined threshold value. Therefore, it is possible to shift the generation timing of the signal transmitted from the at least one antenna to the receiving device and the signal transmitted from the other antenna to the receiving device, and prevent a plurality of peak powers from overlapping at the same timing. Therefore, it is possible to prevent an excessive load from being applied to the power supply of the transmission apparatus.

(8) In addition, a transmission device according to an aspect of the present invention includes a priority determination unit that determines the priority of a signal transmitted from each antenna to the reception device, and the control unit generates a transmission power peak generation timing. When the determination unit determines that they match, the signal determined by the priority determination unit that the priority is low is recorded in the storage unit.
In the present invention, when the transmission power peaks of signals transmitted from the antennas to the receiving device coincide with each other, a signal having a low priority is recorded in the storage unit and transmitted from the plurality of antennas to the receiving device. Since the control unit controls to transmit a signal having a low priority recorded in the storage unit from the at least one antenna to the receiving device when the transmission power of the signal becomes equal to or lower than a predetermined threshold, A signal having a high priority and a signal having a low priority do not overlap with each other, and a signal having a high priority can be preferentially transmitted to the receiving apparatus.

(9) Further, a program according to an aspect of the present invention is a program for communicating with a receiving apparatus, and generating a transmission power peak of a signal transmitted from each antenna to the receiving apparatus by a computer of the transmitting apparatus including a plurality of transmitting antennas. Determining means for determining whether or not coincides with each other, and transmission power of a signal transmitted from at least one of the plurality of antennas to the receiving device when the determining means determines that the generation timings coincide with each other, When the determination unit determines that the generation timings do not coincide with each other, the control unit functions as a control unit that reduces the transmission power of the signal transmitted from the antenna to the reception device.

(10) A transmission method according to an aspect of the present invention is a transmission method using a transmission apparatus that communicates with a reception apparatus and includes a determination unit, a control unit, and a plurality of transmission antennas. The first step for determining whether or not the transmission power peak generation timing of the signal transmitted from the transmission device to the reception device matches, and when the control unit matches the transmission power peak generation timing, If it is determined, transmission power of a signal transmitted from at least one of the plurality of antennas to the receiving device is transmitted from the antenna to the receiving device when the determining unit determines that the generation timing does not match. And a second step of making it smaller than the transmission power of the signal to be transmitted.

  The transmission apparatus, program, and transmission method of the present invention can reduce the load on the power supply of the transmission apparatus when transmitting a signal to the reception apparatus.

  Hereinafter, first to eighth embodiments of the present invention will be described with reference to the drawings. First, a first embodiment of the present invention will be described.

(First embodiment)
FIG. 1 is a schematic block diagram illustrating a configuration of a transmission side of a base station apparatus 100a (also referred to as a transmission apparatus) according to the first embodiment of the present invention. The base station apparatus 100a includes a baseband unit 101, a control unit 102 (also referred to as a determination unit and a priority determination unit), modulation units 111 and 121, filter units 118 and 128, serial / parallel conversion units 112 and 122, an IFFT unit 113, 123, parallel / serial conversion units 114 and 124, CP insertion units 115 and 125, transmission power amplification units 116 and 126, and antennas 117 and 127, respectively.

The baseband unit 101 receives transmission data to be transmitted from an upper layer (not shown) of the base station device 100a to another mobile station device 200 (FIG. 4). The baseband unit 101 divides this transmission data into transmission data D118 and transmission data D128.
The base station apparatus 100a communicates with many mobile station apparatuses. Transmission data D118 and transmission data D128 may be data transmitted to mobile station apparatuses having different transmission destinations or data transmitted to one mobile station apparatus using two antennas.
In general, in order to transmit to a large number of mobile station apparatuses from one antenna, signals are multiplexed and transmitted. The embodiment of the present invention is applied to this multiplexed communication method. Also good.

  The baseband unit 101 outputs the transmission data D118 to the modulation unit 111 and the control unit 102. In addition, the baseband unit 101 outputs the transmission data D128 to the modulation unit 121 and the control unit 102.

The control unit 102 measures the arrangement pattern of the transmission data D118 and the transmission data D128, and estimates the transmission power levels of the transmission power amplification units 116 and 126.
The control unit 102 receives a control signal D104 for controlling the modulation unit 111, the serial / parallel conversion unit 112, the filter unit 118, and the transmission power amplification unit 116. The modulation unit 111, the serial / parallel conversion unit 112, the filter unit 118, Each is output to transmission power amplification section 116.
In addition, the control unit 102 transmits a control signal D105 for controlling each of the modulation unit 121, the serial / parallel conversion unit 122, the filter unit 128, and the transmission power amplification unit 126, to the modulation unit 121, the serial / parallel conversion unit 122, and the filter unit. 128 and output to the transmission power amplifier 126, respectively.

Modulation section 111 determines a modulation scheme based on information included in control signal D104 output from control section 102, modulates transmission data D118 output from baseband section 101, and outputs the result to serial / parallel conversion section 112. To do. The above modulation scheme can be set by a known method.
Also, the modulation unit 121 determines a modulation scheme based on information included in the control signal D105 output from the control unit 102, modulates the transmission data D128 output from the baseband unit 101, and converts the serial / parallel conversion unit 122. Output to.

The serial / parallel conversion unit 112 converts the signal output from the modulation unit 111 from serial data into parallel data, and outputs the parallel data to the IFFT unit 113.
Further, the serial / parallel converter 122 converts the signal output from the modulator 121 from serial data to parallel data, and outputs the parallel data to the IFFT unit 123.

The IFFT unit 113 performs an inverse fast Fourier transform process on the signal output from the serial / parallel conversion unit 112, converts the frequency domain signal into a time domain signal, and outputs the signal to the filter unit 118.
The IFFT unit 123 performs inverse fast Fourier transform processing on the signal output from the serial / parallel conversion unit 122, converts the frequency domain signal into a time domain signal, and outputs the time domain signal to the filter unit 128.

The filter unit 118 performs a filtering process on the signal output from the IFFT unit 113 and outputs the filtered signal to the parallel-serial conversion unit 114.
Further, the filter unit 128 performs a filtering process on the signal output from the IFFT unit 123 and outputs the filtered signal to the parallel-serial conversion unit 124.

The parallel / serial conversion unit 114 converts the signal output from the filter unit 118 from parallel data to serial data, and outputs the converted data to the CP insertion unit 115.
The parallel / serial conversion unit 124 converts the signal output from the filter unit 128 from parallel data to serial data, and outputs the converted data to the CP insertion unit 125.

CP insertion section 115 inserts a CP into the signal output from parallel to serial conversion section 114 and outputs the signal to transmission power amplification section 116. This CP is inserted in order to reduce the influence of intersymbol interference.
In addition, CP insertion section 125 inserts a CP into the signal output from parallel / serial conversion section 124 and outputs the result to transmission power amplification section 126.
Note that the CP insertion unit 115 (or the CP insertion unit 125) may insert a CP into the parallel data output from the IFFT unit 113 or the filter unit 118 (or the IFFT unit 123 or the filter unit 128).

Based on the amplification degree information included in the control signal D104 output from the control unit 102, the transmission power amplification unit 116 amplifies the signal output from the CP insertion unit 115 with the amplification degree, and moves from the antenna 117 as a radio signal. Send to station device.
The transmission power amplifying unit 126 amplifies the signal output from the CP insertion unit 125 based on the amplification degree information included in the control signal D105 output from the control unit 102, and transmits a radio signal from the antenna 127. To the same mobile station apparatus.
In addition, in the base station apparatus 100a of FIG. 1, the subcarrier allocation part (refer FIG. 4 mentioned later) is provided before and behind the filter parts 118 and 128, and the signal output from the IFFT parts 113 and 123 is replaced. Also good.

  FIG. 2 is a schematic block diagram showing the configuration of the receiving side of the base station device 100a according to the first embodiment of the present invention. The base station apparatus 100a includes an antenna 131, a front end unit 132, a signal separation and sampling unit 133, a serial / parallel conversion unit 134, an FFT unit 135, a parallel / serial conversion unit 136, a demodulation unit 137, a baseband unit 138, a CPU (Central Processing). Unit: a central processing unit) 139.

A radio signal received by the antenna 131 is input to the front end unit 132. The front end unit 132 includes a filter, an LNA (Low Noise amplifier), and the like, and adjusts a radio signal output from the antenna 131.
The signal output from the front end unit 132 is input to the signal separation sampling unit 133, the CP signal and the data signal are separated, and only the data signal is output to the serial / parallel conversion unit 134.
The serial / parallel converter 134 converts the serial signal output from the signal separation and sampling unit 133 into a parallel signal and outputs the parallel signal to the FFT unit 135. The FFT unit 135 converts the time domain signal output from the serial / parallel conversion unit 134 into a frequency domain signal and outputs the frequency domain signal to the parallel / serial conversion unit 136.
The parallel / serial conversion unit 136 converts the parallel signal output from the FFT unit 135 into a serial signal and outputs the serial signal to the demodulation unit 137.
The demodulator 137 demodulates the signal output from the parallel-serial converter 136 and outputs the demodulated signal to the baseband unit 138. The baseband unit 138 performs error correction processing on the signal output from the demodulation unit 137 and outputs the signal to the CPU 139. The CPU 139 outputs a signal to an upper layer (not shown) of the base station device 100a.

  FIG. 3 is a flowchart showing a process of the base station device 100a according to the first embodiment of the present invention. First, the control unit 102 obtains the peak generation timing of the transmission power of the signals transmitted from the antennas 117 and 127 (step S101). Specifically, when the array pattern of the signal D118 transmitted from the antenna 117 corresponds to a predetermined pattern (for example, when a predetermined number of 1s are consecutive in the array pattern of 0 and 1), the control unit 102 The time t11 at which the array pattern is transmitted from the antenna 117 is defined as the peak generation timing of the signal transmission power transmitted from the antenna 117. In addition, when the array pattern of the signal D128 transmitted from the antenna 127 corresponds to a predetermined pattern (for example, when a predetermined number of 1s are consecutive in the array pattern of 0 and 1), the control unit 102 changes the array pattern. The time t12 transmitted from the antenna 127 is set as the occurrence timing of the peak of the signal transmission power transmitted from the antenna 127.

And the control part 102 determines whether the generation | occurrence | production timing of the peak of the transmission power of the signal transmitted from each antenna 117, 127 corresponds (step S102). Specifically, the control unit 102 determines whether or not the generation timing t11 obtained in step S101 matches the generation timing t12 obtained in step S101.
Note that the occurrence timing t11 and the occurrence timing t12 coincide with each other when each peak occurs in the same time slot or in adjacent time slots before and after, but not only in time slot units but also in subframe units. The time unit can be arbitrarily selected depending on the radio system such as a radio frame unit or a data symbol unit. For example, in the method of performing communication in units of subframes, the control unit 102 determines that the generation timings coincide when peak power of transmission power occurs in the same subframe or in adjacent subframes before and after the same subframe. To do.

If the generation timings match, the control unit 102 determines “YES” in step S102, and proceeds to step S103.
And the control part 102 compares the magnitude | size of the peak of the transmission power of the signal transmitted from each antenna 117,127 (step S103). Specifically, the control unit 102 compares the magnitude of the transmission power peak of the signal transmitted from the antenna 117 at the generation timing t11 with the magnitude of the transmission power peak of the signal transmitted from the antenna 127 at the generation timing t12. .

Two pieces of information are required to compare the transmission power from the antennas. One is information on the magnitude of peak power obtained from the data arrangement of transmission data D118 and transmission data D128. The other is information on the degree of amplification set in advance in the transmission power amplifier.
For example, in the method of knowing the magnitude of the peak power from the data array, the peak power is estimated by monitoring the data array to see how many 1's are continuous. Comparing the case where 1 data is continuous for 10 bits and the case where data is continuous for 3 bits, it is presumed that a larger peak power is generated in the data where 1 is continuous for 10 bits.
As an example, the above data pattern has been described. However, since the data arrangement in which peak power is generated differs depending on the communication method and modulation method, the generation of peak power may be estimated by observing other patterns.

Next, the amplification degree set in the transmission power amplification unit is acquired. For example, when the amplification degree set in advance in the transmission power amplification unit is high, even if the peak power due to the data arrangement is small, the antenna eventually has a large peak power. If the amplification level of the transmission power amplifying unit is set small, the peak power as a whole will not increase even if the peak power due to the data arrangement is large.
As described above, the magnitude of the peak power is determined based on the peak power estimated from the data array and the preset amplification degree of the transmission power amplification unit.

Returning to FIG. 3, the control unit 102 performs filtering with a large transmission power reduction effect on a signal having a larger transmission power peak (step S <b> 104). Then, normal filtering is performed on the signal having the smaller transmission power peak (step S105). Specifically, the control unit 102 outputs the control signals D104 and D105 to the filter units 118 and 128, so that when the generation timing t11 matches the generation timing t12, at least one of the plurality of antennas 117 and 127 is obtained. The filter coefficient (for example, 0.8) used for filtering by the filter unit 128 in the signal transmitted from the two antennas (here, the antenna 127) to the mobile station apparatus (receiving apparatus) matches the generation timing t11 and the generation timing t12. If not, the signal transmitted from the antenna (in this case, the antenna 127) to the mobile station apparatus is set larger than the filter coefficient (for example, 0.5) used by the filter unit 128 for filtering.
Then, after transmitting the signals processed in steps S104 and S105 from the antennas 117 and 127 to the receiving apparatus, the process proceeds to step S101.

On the other hand, if the generation timings do not match, the control unit 102 determines “NO” in step S102, and proceeds to step S106.
Then, the control unit 102 performs normal filtering on the signals transmitted from the antenna 117 and the antenna 127 (step S106), and transmits the signals from the antennas 117 and 127 to the receiving device. Specifically, the control unit 102 performs filtering using a filter coefficient (for example, 0.5) on a signal transmitted from the antennas 117 and 127 to the receiving device, and transmits the signal from the antennas 117 and 127 to the receiving device.

Note that FIG. 3 illustrates the case where 0.5 is used as the filter coefficient when performing normal filtering.
In general, when the clipping amount is large and the filter coefficients of the filter units 118 and 128 are set large, the amount of suppression of the peak power of the transmission power becomes large and the power consumption in the communication apparatus can be suppressed. Communication quality deteriorates. Conversely, when the clipping amount is small and the filter coefficients of the filter units 118 and 128 are set small, the peak power suppression amount is small, the power consumption in the communication device is increased, and the transmission data has good communication quality. Can be maintained.

In FIG. 3, only the filter coefficient used by the filter unit is changed. However, the present invention is not limited to this. For example, in step S104, both the type of filter used by the filter unit and the filter coefficient may be changed. For example, in step S104, the filter type is a rectangular filter and filtering is performed with a filter coefficient of 0.8. In step S105, the filter type is a Kaiser filter and filtering is performed with a filter coefficient of 0.5. May be performed. Here, the rectangular filter is a filter that reduces a constant signal component in the entire frequency band, and the Kaiser filter is a filter that passes only a certain frequency component.
In the present embodiment, the case where the rectangular filter or the Kaiser filter is used has been described. However, the present invention is not limited to this, and other filters such as a Gaussian filter, a Hanning filter, and a Blackman filter may be used.

  FIG. 3 illustrates the case where the process of step S105 is performed after the process of step S104. However, the present invention is not limited to this, and the process of step S104 is performed after the process of step S105. Alternatively, the processing of step S104 and step S105 may be performed simultaneously.

  FIG. 4 is a schematic block diagram showing a configuration on the transmission side of the mobile station device 200 (also referred to as a transmission device) according to the first embodiment of the present invention. The mobile station apparatus 200 includes a baseband unit 201, a control unit 202 (determination unit, priority determination unit), modulation units 211 and 221, FFT units (also referred to as Fourier transform units) 212 and 222, filter units 213 and 223, Carrier allocation units (also referred to as subcarrier arrangement units) 214 and 224, IFFT units 215 and 225, CP insertion units 216 and 226, transmission power amplification units 217 and 227, and antennas 219 and 229 are provided.

The baseband unit 201 receives transmission data transmitted from the upper layer (not shown) of the mobile station apparatus 200 to the base station apparatus 100a. The baseband unit 201 divides this transmission data into transmission data D218 and transmission data D228.
Baseband section 201 outputs transmission data D218 output from the upper layer of mobile station apparatus 200 to modulation section 211 and control section 202. The baseband unit 201 also outputs transmission data D228 output from the upper layer of the mobile station apparatus 200 to the modulation unit 221 and the control unit 202.

The control unit 202 measures the arrangement pattern of the transmission data D218 and the transmission data D228, and estimates the transmission power levels of the transmission power amplification units 217 and 227.
The control unit 202 also receives a control signal D204 for controlling the modulation unit 211, the FFT unit 212, the filter unit 213, the subcarrier allocation unit 214, and the transmission power amplification unit 217, the modulation unit 211, the FFT unit 212, Output to filter section 213, subcarrier allocation section 214, and transmission power amplification section 217.
The control unit 202 also receives a control signal D205 for controlling each of the modulation unit 221, the FFT unit 222, the filter unit 223, the subcarrier allocation unit 224, and the transmission power amplification unit 227, the modulation unit 221, the FFT unit 222, The data are output to filter section 223, subcarrier allocation section 224, and transmission power amplification section 227, respectively.

Modulation section 211 determines a modulation scheme based on information included in control signal D204 output from control section 202, modulates transmission data D218 output from baseband section 201, and outputs the modulated data to FFT section 212. The above modulation scheme can be set by a known method.
Further, the modulation unit 221 determines a modulation method based on information included in the control signal D205 output from the control unit 202, modulates transmission data D228 output from the baseband unit 201, and outputs the modulated transmission data to the FFT unit 222. To do.

The FFT unit 212 performs fast Fourier transform processing on the signal output from the modulation unit 211 based on the control signal D204 output from the control unit 202, converts the time domain signal into a frequency domain signal, The data is output to the filter unit 213.
Further, the FFT unit 222 performs fast Fourier transform processing on the signal output from the modulation unit 221 based on the control signal D205 output from the control unit 202, and converts the time domain signal into the frequency domain signal. And output to the filter unit 223.

The filter unit 213 performs filtering processing on the signal output from the FFT unit 212 based on the filter type and the filter coefficient included in the control signal D204 output from the control unit 202, and sends the signal to the subcarrier allocation unit 214. Output.
Further, the filter unit 223 performs a filtering process on the signal output from the FFT unit 222 based on the filter type and the filter coefficient included in the control signal D205 output from the control unit 202, and the subcarrier allocation unit Output to 224.

Based on the control signal D204 output from the control unit 202, the subcarrier allocation unit 214 arranges the signal output from the filter unit 213 in the subcarrier and outputs the signal to the IFFT unit 215.
Further, subcarrier allocation section 224 arranges the signal output from filter section 223 on the subcarrier based on control signal D205 output from control section 202, and outputs the signal to IFFT section 225.

IFFT section 215 performs inverse fast Fourier transform processing on the signal output from subcarrier allocation section 214, converts the frequency domain signal into a time domain signal, and outputs the signal to CP insertion section 216.
In addition, IFFT section 225 performs inverse fast Fourier transform processing on the signal output from subcarrier allocation section 224, converts the frequency domain signal into a time domain signal, and outputs the signal to CP insertion section 226.

CP insertion section 216 inserts a CP into the signal output from IFFT section 215 and outputs the signal to transmission power amplification section 217.
Further, CP insertion section 226 inserts a CP into the signal output from IFFT section 225 and outputs the signal to transmission power amplification section 227.
Note that the CP insertion unit 216 (or the CP insertion unit 226) includes an FFT unit 212 (or an FFT unit 222), a subcarrier allocation unit 214 (or a subcarrier allocation unit 224).
A CP may be inserted into the parallel data output by.

Based on the amplification degree information included in the control signal D204 output from the control unit 202, the transmission power amplification unit 217 amplifies the signal output from the CP insertion unit 216 with the amplification degree, and transmits the base station as a radio signal from the antenna 219. Send to station device.
Also, the transmission power amplification unit 227 amplifies the signal output from the CP insertion unit 226 with the amplification degree based on the amplification degree information included in the control signal D205 output from the control unit 202, and transmits a radio signal from the antenna 229. To the base station apparatus.

  In addition, similarly to the base station device 100a (FIG. 1) including the control unit 102, filter units 118 and 128, antennas 117 and 127, the mobile station device 200 also includes the control unit 202, filter units 213, 223, Antennas 219 and 229 are provided. Therefore, the mobile station apparatus 200 can execute the process of the flowchart of FIG. 3 in the same manner as the base station apparatus 100a executes the process of the flowchart of FIG.

  FIG. 5 is a schematic block diagram showing a configuration on the receiving side of the mobile station apparatus 200 according to the first embodiment of the present invention. The mobile station apparatus 200 includes an antenna 231, a front end unit 232, a signal separation and sampling unit 233, an FFT unit 234, a subcarrier arrangement unit 235, an IFFT unit 236, a demodulation unit 237, a baseband unit 238, and a CPU 239.

A radio signal received by the antenna 231 is input to the front end unit 232. The front end unit 232 includes a filter, an LNA, and the like, adjusts a radio signal, and outputs the radio signal to the signal separation sampling unit 233.
The signal separation and sampling unit 233 separates the CP signal and the data signal and outputs only the data signal to the FFT unit 234.
The FFT unit 234 converts the signal output from the signal separation sampling unit 233 from a time domain signal to a frequency domain signal and outputs the signal to the subcarrier arrangement unit 235.
Subcarrier arrangement section 235 outputs the signal output from FFT section 234 to IFFT section 236 by rearranging the subcarrier order to the original arrangement based on the subcarrier arrangement information of the transmission apparatus.
IFFT section 236 converts the signal output from subcarrier arrangement section 235 from a frequency domain signal into a time domain signal, and outputs the signal to demodulation section 237.
Demodulation section 237 demodulates the signal output from IFFT section 236 and outputs the demodulated signal to baseband section 238.
The baseband unit 238 performs processing such as error correction on the signal output from the demodulation unit 237 and outputs the processed signal to the CPU 239. CPU 239 outputs a signal to an upper layer (not shown) of mobile station apparatus 200.

6 and 7 are diagrams for explaining the effect of the first embodiment of the present invention.
FIG. 6 shows a change in transmission power when the base station apparatus 100a according to the first embodiment does not perform the flowchart of FIG. In FIG. 6, the horizontal axis indicates time, and the vertical axis indicates transmission power.
A curve A0 in FIG. 6 shows a change in power consumption of the transmission power amplification unit 116, a curve B0 in FIG. 6 shows a change in power consumption in the transmission power amplification unit 126, and a curve C0 in FIG. The power consumption added by the amplification unit 116 and the transmission power amplification unit 126 is shown. The overall power consumption of the transmission power amplification unit of the base station apparatus 100a is C0 = A0 + B0.

FIG. 7 shows a change in transmission power when the base station apparatus 100a according to the first embodiment performs the flowchart of FIG. In FIG. 7, the horizontal axis indicates time, and the vertical axis indicates transmission power.
A curve A1 in FIG. 7 shows a change in power consumption of the transmission power amplification unit 116, a curve B1 in FIG. 7 shows a change in power consumption in the transmission power amplification unit 126, and a curve C1 in FIG. The power consumption added by the amplification unit 116 and the transmission power amplification unit 126 is shown. The overall power consumption of the transmission power amplification unit of the base station apparatus 100a is C1 = A1 + B1.
When the coefficient obtained from the filter coefficient used by the filter unit 118 is α1, and the coefficient obtained from the filter coefficient used by the filter unit 128 is β1, C1 = A1 + B1 = A0 × α1 + B0 × β1. α1 and β1 are coefficients determined according to the filter coefficients used by the filter units 118 and 128, and 0 <α1 <1 and 0 <β1 <1.

  The filter generally has a function of reducing the component of a signal that passes therethrough. As the filter coefficient of the filter is increased, the signal component that passes through the filter is gradually reduced to narrow the signal component. For this reason, when a signal component becomes small, the power required for transmission also becomes small.

In the first embodiment, when the generation timing t11 of the transmission power peak of the signal transmitted from the antenna 117 and the generation timing t12 of the transmission power peak of the signal transmitted from the antenna 127 do not match, the filter unit 118. Is set to 0.5, and the filter coefficient of the filter unit 128 is set to 0.5. The transmission power peak generation timing t11 of the signal transmitted from the antenna 117 coincides with the transmission power peak generation timing t12 of the signal transmitted from the antenna 127, and the signal transmitted from the antenna 127 is transmitted. When the peak magnitude of the transmission power is larger than the peak magnitude of the transmission power of the signal transmitted from the antenna 117, the filter coefficient of the filter unit 118 is set to 0.5, and the filter coefficient of the filter unit 128 is set to Set to 0.8.
Thereby, the transmission power C1 of the base station apparatus 100a when the generation timing t11 and the generation timing t12 match is smaller than the transmission power C0 of the base station apparatus 100a when the generation timing t11 and the generation timing t12 do not match. It is possible to prevent an excessive load from being applied to the power supply of the base station apparatus 100a.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. Since the configuration of the communication apparatus according to the present embodiment is the same as that of the base station apparatus 100a (FIG. 1) according to the first embodiment, the description thereof is omitted.

FIG. 8 is a flowchart showing a process of the base station device 100a according to the second embodiment of the present invention. Note that in the second embodiment, the description of the same processing contents as in the first embodiment is omitted.
First, the control unit 102 obtains the peak generation timing of the transmission power of the signals transmitted from the antennas 117 and 127 (step S201).
And the control part 102 determines whether the generation | occurrence | production timing of the peak of the transmission power of the signal transmitted from each antenna 117, 127 corresponds (step S202).

If the generation timings match, the control unit 102 determines “YES” in step S202, and proceeds to step S203.
And the control part 102 compares the magnitude | size of the peak of the transmission power of the signal transmitted from each antenna 117,127 (step S203).

And the control part 102 applies a modulation system with a big reduction effect of transmission power with respect to the signal with the larger peak of transmission power (step S204). Then, the modulation scheme when no peak power is generated is applied as it is to the signal having the smaller peak of transmission power (step S205). Specifically, the control unit 102 outputs a control signal to the modulation units 111 and 121 so that when the generation timing t11 and the generation timing t12 coincide with each other, the control unit 102 outputs at least one of the plurality of antennas 117 and 127 ( Here, a multi-value number of a modulation scheme (for example, 16 QAM (16 Quadrature Amplitude Modulation)) used by the modulation unit 121 for a signal transmitted from the antenna 127 to the receiving device is expressed as a generation timing t11 and a generation timing t12. And the modulation scheme used by the modulation unit 121 for a signal transmitted from the antenna (in this case, the antenna 127) to the receiving device (for example, 64 QAM (64 Quadrature Amplitude Modulation) )) Is smaller than the number of levels.
Then, the signals processed in steps S204 and S205 are transmitted from the antennas 117 and 127 to the receiving apparatus, and then the process proceeds to step S201.

On the other hand, if the generation timings do not match, the control unit 102 determines “NO” in step S202, and proceeds to step S206.
Then, the control unit 102 applies a normal modulation scheme to the signals transmitted from the antenna 117 and the antenna 127 (step S206), and transmits the signals from the antennas 117 and 127 to the receiving device. Specifically, the control unit 102 modulates a signal transmitted from the antennas 117 and 127 to the receiving apparatus using 64QAM as a modulation scheme, and transmits the signals from the antennas 117 and 127 to the receiving apparatus.

  In addition, although the case where the modulation units 111 and 121 use 16QAM or 64QAM as a modulation method has been described in FIG. 8, the present invention is not limited to this, and BPSK (Binary Phase Shift Keying: two-phase shift keying) ), Other modulation schemes such as QPSK (Quadrature Phase Shift Keying).

  8 illustrates the case where the process of step S205 is performed after the process of step S204. However, the present invention is not limited to this, and the process of step S204 is performed after the process of step S205. Alternatively, the processing in step S204 and step S205 may be performed simultaneously.

FIG. 9 shows a change in transmission power when the flowchart of FIG. 8 is performed by the base station apparatus 100a according to the second embodiment of the present invention. In FIG. 8, the horizontal axis indicates time, and the vertical axis indicates transmission power.
A curve A2 in FIG. 9 shows a change in power consumption of the transmission power amplification unit 116, a curve B2 in FIG. 9 shows a change in power consumption in the transmission power amplification unit 126, and a curve C1 in FIG. The power consumption added by the amplification unit 116 and the transmission power amplification unit 126 is shown. The overall power consumption of the transmission power amplification unit of the base station apparatus 100a is C2 = A2 + B2.

In the second embodiment, when the generation timing t11 of the transmission power peak of the signal transmitted from the antenna 117 does not coincide with the generation timing t12 of the transmission power peak of the signal transmitted from the antenna 127, the modulation unit 111 Is set to 64QAM, and the modulation method of the modulation unit 121 is set to 64QAM. The transmission power peak generation timing t11 of the signal transmitted from the antenna 117 coincides with the transmission power peak generation timing t12 of the signal transmitted from the antenna 127, and the signal transmitted from the antenna 127 is transmitted. When the peak magnitude of the transmission power is larger than the peak magnitude of the transmission power of the signal transmitted from the antenna 117, the modulation scheme of the modulation unit 111 is set to 64QAM, and the modulation scheme of the modulation unit 121 is set to 16QAM. Set.
Thereby, transmission of base station apparatus 100a when generation timing t11 and generation timing t12 match rather than transmission power C0 (FIG. 6) of base station apparatus 100a when generation timing t11 and generation timing t12 do not match. The power C2 can be reduced, and an excessive load can be prevented from being applied to the power supply of the base station apparatus 100a.

(Third embodiment)
Next, a third embodiment of the present invention will be described. Since the configuration of the communication apparatus according to the present embodiment is the same as that of the mobile station apparatus 200 (FIG. 4) according to the first embodiment, the description thereof is omitted.

  FIG. 10 is a flowchart showing processing of the mobile station apparatus 200 according to the third embodiment of the present invention. First, the control unit 202 obtains the generation timing of the peak of the transmission power of the signal transmitted from each antenna 219, 229 (step S301). Specifically, the control unit 202, when the arrangement pattern of the signal D218 transmitted from the antenna 219 corresponds to a predetermined pattern (for example, when a predetermined number of 1s in the arrangement pattern of 0 and 1 continues) The time t13 at which the array pattern is transmitted from the antenna 219 is defined as the peak generation timing of the signal transmission power transmitted from the antenna 219. In addition, when the array pattern of the signal D228 transmitted from the antenna 229 corresponds to a predetermined pattern (for example, when a predetermined number of 1s are consecutive in the array pattern of 0 and 1), the control unit 202 changes the array pattern. The time t14 transmitted from the antenna 229 is set as the occurrence timing of the peak of the signal transmission power transmitted from the antenna 229.

  Then, the control unit 202 determines whether or not the transmission power peaks of the signals transmitted from the antennas 219 and 229 coincide with each other (step S302). Specifically, the control unit 202 determines whether or not the generation timing t13 obtained in step S301 matches the generation timing t14 obtained in step S301. Note that not only when the generation timing t13 and the generation timing t14 completely match, but also when the difference between the generation timing t13 and the generation timing t14 is smaller than a predetermined threshold, The control unit 202 may make the determination.

If the generation timings match, the control unit 202 determines “YES” in step S302, and the process proceeds to step S303.
And the control part 202 compares the magnitude | size of the peak of the transmission power of the signal transmitted from each antenna 219,229 (step S303). Specifically, the control unit 202 compares the magnitude of the transmission power peak of the signal transmitted from the antenna 219 at the generation timing t13 with the magnitude of the transmission power peak of the signal transmitted from the antenna 229 at the generation timing t14. .

And the control part 202 applies the arrangement method to the subcarrier with a big transmission power reduction effect with respect to the signal with the larger peak of transmission power (step S304). Then, a normal arrangement method for subcarriers is applied to a signal having a smaller transmission power peak (step S305). Specifically, the control unit 202 outputs the control signals D204 and D205 to the subcarrier allocation units 214 and 224 so that when the generation timing t13 and the generation timing t14 do not coincide with each other, A method in which a signal transmitted from at least one antenna (here, antenna 229) to a receiving apparatus is arranged by the subcarrier allocation unit 224 in a subcarrier (for example, a method in which a signal is arranged every other subcarrier) is generated. A method in which the subcarrier allocating unit 224 places a signal transmitted from the antenna (here, the antenna 229) to the receiving apparatus when the t13 and the generation timing t14 coincide with each other (for example, every third subcarrier signal) To change the sub A allocation unit 224 increases the distance to place a signal on a subcarrier.
Then, after the signals processed in steps S304 and S305 are transmitted from the antennas 219 and 229 to the receiving device, the process proceeds to step S301.

On the other hand, if the generation timings do not match, the control unit 202 determines “NO” in step S302 and proceeds to step S306.
Then, the control unit 202 applies a normal subcarrier arrangement method to the signals transmitted from the antenna 219 and the antenna 229 (step S306), and transmits the signals from the antennas 219 and 229 to the receiving apparatus. Specifically, the control unit 202 arranges every other signal to be transmitted from the antennas 219 and 229 to the reception device, and transmits the signals from the antennas 219 and 229 to the reception device.

  In FIG. 10, subcarrier allocation sections 214 and 224 use a method of arranging a signal every other subcarrier or a method of arranging a signal every three subcarriers as a method of arranging signals on subcarriers. Although the case where it uses is demonstrated, it is not limited to this, You may use the other arrangement | positioning method.

  10 illustrates the case where the process of step S305 is performed after the process of step S304. However, the present invention is not limited to this, and the process of step S304 is performed after the process of step S305. Alternatively, the processing in step S304 and step S305 may be performed simultaneously.

  According to the third embodiment, when the generation timings of the transmission power peaks of the signals transmitted from the antennas 219 and 229 to the reception device match, at least one of the plurality of antennas 219 and 229 (here, The interval at which the signal transmitted from the antenna 229) to the receiving device is arranged on the subcarrier is set to be smaller than the interval at which the signal transmitted from the antenna (in this case, the antenna 229) to the receiving device is arranged on the subcarrier when the generation timing does not match. Therefore, even if the transmission power peaks of the signals transmitted from the plurality of transmission antennas 219 and 229 occur at the same generation timing, the antenna (here, the antenna 229) is controlled. For the signal transmitted from the receiver to the receiver, the interval between the subcarriers is large. , Low power consumption communication mode can be used, it is possible to prevent the consuming an excessive load on the power supply of the mobile station apparatus 200.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described. Since the configuration of the communication apparatus according to the present embodiment is the same as that of the mobile station apparatus 200 (FIG. 4) according to the first embodiment, the description thereof is omitted.

  FIG. 11 is a flowchart showing processing of the mobile station apparatus 200 according to the fourth embodiment of the present invention. In the fourth embodiment, the description of the same processing content as that of the third embodiment (FIG. 10) is omitted. First, the control unit 202 obtains the generation timing of the peak of transmission power of signals transmitted from the antennas 219 and 229 (step S401).

Then, the control unit 202 determines whether or not the transmission power peaks of the signals transmitted from the antennas 219 and 229 coincide with each other (step S402).
If the generation timings match, the control unit 202 determines “YES” in step S402, and proceeds to step S403.
And the control part 202 compares the magnitude | size of the peak of the transmission power of the signal transmitted from each antenna 219,229 (step S403).

Then, the control unit 202 applies a Fourier transform with a large transmission power reduction effect to a signal having a larger transmission power peak (step S404). Then, the normal Fourier transform is applied to the signal having the smaller transmission power peak (step S405). Specifically, the control unit 202 outputs control signals D204 and D205 to the FFT units 212 and 222, so that when the generation timing t13 matches the generation timing t14, at least one of the plurality of antennas 219 and 229 is output. The sampling frequency (for example, 100 MHz) and the FFT size (for example, 256) of the Fourier transform applied by the FFT unit 222 to the signal transmitted from the two antennas (here, the antenna 229) to the receiving device, the generation timing t13, and the generation When the timing t14 does not match, the sampling frequency (for example, 200 MHz) of the Fourier transform applied by the FFT unit 222 to the signal transmitted from the antenna (here, the antenna 229) to the receiving apparatus and the FFT size (for example, 512) ) Smaller than.
Then, after transmitting the signals processed in steps S404 and S405 from the antennas 219 and 229 to the receiving apparatus, the process proceeds to step S401.

On the other hand, if the generation timings do not match, the control unit 202 determines “NO” in step S402 and proceeds to step S406.
The control unit 202 applies normal Fourier transform to the signals transmitted from the antenna 219 and the antenna 229 (step S406), and transmits the signals from the antennas 219 and 229 to the receiving device. Specifically, the control unit 202 performs a Fourier transform on a signal transmitted from the antennas 219 and 229 to the receiving device with a sampling frequency of 200 MHz and an FFT size of 512.

In addition, although FIG. 11 demonstrated the case where the FFT units 212 and 222 use 100 MHz or 200 MHz as the sampling frequency of Fourier transform and 256 or 512 as the FFT size, the present invention is not limited to this. The sampling frequency or the FFT size may be used.
Further, in FIG. 11, the case where both the sampling frequency and the FFT size are changed when the generation timing t13 and the generation timing t14 coincide with each other has been described. However, the present invention is not limited to this, and the sampling frequency and the FFT size are not limited thereto. Only one of them may be changed.

  In addition, although FIG. 11 demonstrates the case where the process of step S405 is performed after the process of step S404, it is not limited to this, The process of step S404 is performed after the process of step S405. Alternatively, the processing in step S404 and step S405 may be performed simultaneously.

  According to the fourth embodiment, when the generation timings of the transmission power peaks of the signals transmitted from the antennas 219 and 229 to the reception device coincide with each other, at least one of the plurality of antennas 219 and 229 (here, The Fourier transform size or sampling frequency applied to the signal transmitted from the antenna 229) to the receiving device is applied to the signal transmitted from the antenna (here, the antenna 229) to the receiving device when the generation timing does not match. Since the control unit 202 controls to be smaller than the size or the sampling frequency, even when transmission power peaks of signals transmitted from the plurality of transmission antennas 219 and 229 occur at the same generation timing, Here, the signal transmitted from the antenna 229) to the receiving device In contrast, it is possible to apply a small Fourier transform sizes or sampling frequency. Therefore, the generation timing of the peak of the transmission power of the signal transmitted from at least one antenna (here, antenna 229) to the receiving device and the signal transmitted from the other antenna (here, antenna 219) to the receiving device is shifted. Therefore, it is possible to prevent a plurality of peaks from overlapping at the same timing, and it is possible to prevent an excessive load from being applied to the power supply of the mobile station apparatus 200.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described. Since the configuration of the communication apparatus according to the present embodiment is the same as that of the base station apparatus 100a (FIG. 1) according to the first embodiment, the description thereof is omitted.

FIG. 12 is a flowchart showing a process of the base station device 100a according to the fifth embodiment of the present invention. Note that in the fifth embodiment, a description of processes that are the same as those in the first embodiment is omitted.
First, the control unit 102 obtains the peak generation timing of the transmission power of the signals transmitted from the antennas 117 and 127 (step S501).

Then, the control unit 102 determines whether or not the transmission power peaks of the signals transmitted from the antennas 117 and 127 coincide with each other (step S502).
If the generation timings match, the control unit 102 determines “YES” in step S502, and the process proceeds to step S503.
And the control part 102 compares the magnitude | size of the peak of the transmission power of the signal transmitted from each antenna 117,127 (step S503).

Then, the control unit 102 applies the amplification factor of the transmission power with a large transmission power reduction effect to the signal having the larger transmission power peak (step S504). Then, a normal amplification factor is applied to the signal having the smaller transmission power peak (step S505). Specifically, the control unit 102 outputs a control signal to the transmission power amplifying units 116 and 126 so that when the generation timing t11 matches the generation timing t12, at least one of the plurality of antennas 117 and 127 is obtained. When the generation timing t11 and the generation timing t12 do not match the amplification factor (for example, 20 dB) of the transmission power of the signal transmitted from the antenna (here, the antenna 127) to the receiving device, the antenna (here, the antenna 127) To be smaller than the amplification factor (for example, 24 dB) of the transmission power of the signal transmitted to the receiving device.
Then, after the signals processed in steps S504 and S505 are transmitted from the antennas 117 and 127 to the receiving device, the process proceeds to step S501.

On the other hand, if the generation timings do not match, the control unit 102 determines “NO” in step S502 and proceeds to step S506.
Then, the control unit 102 applies a normal amplification factor to the signals transmitted from the antenna 117 and the antenna 127 (step S506), and transmits the signals from the antennas 117 and 127 to the receiving device. Specifically, the control unit 102 uses 24 dB as the amplification factor of the transmission power of the signal transmitted from the antennas 117 and 127 to the receiving apparatus, and transmits the antenna from the antennas 117 and 127 to the receiving apparatus.

  In FIG. 12, the transmission power amplifying units 116 and 126 have been described as using 20 dB or 24 dB as an amplification factor, but the present invention is not limited to this, and other amplification factors may be used. .

FIG. 12 illustrates the case where the process of step S505 is performed after the process of step S504. However, the present invention is not limited to this, and the process of step S504 is performed after the process of step S505. Alternatively, the processing in step S504 and step S505 may be performed simultaneously.
In FIG. 12, when the generation timings coincide with each other, the control unit 102 changes only the amplification factor of the transmission power amplification unit 126. However, the present invention is not limited to this, and the transmission power amplification unit 116 and Both amplification factors of the transmission power amplifier 126 may be changed. In this case, the amplification factor of the signal having the larger transmission power peak is set to be smaller than the amplification factor of the signal having the smaller transmission power peak.

  In the fifth embodiment, when the generation timings of the transmission power peaks of the signals transmitted from the antennas 117 and 127 to the reception device match, at least one of the plurality of antennas 117 and 127 (here, the antenna 127 is used). ) From the antenna (here, antenna 127) when the generation timing does not match, the control unit 102 controls the amplification factor for the signal transmitted to the receiving device to be smaller than the amplification factor for the signal transmitted to the receiving device. Therefore, even when transmission power peaks of signals transmitted from a plurality of transmission antennas 117 and 127 occur at the same generation timing, the signal transmitted from the antenna (here, antenna 127) to the receiving device A communication method with a small amplification factor, that is, low power consumption can be used. Can take an excessive load on the power supply of the apparatus 100a can be prevented.

(Sixth embodiment)
Next, a sixth embodiment of the present invention will be described.
FIG. 13 is a schematic block diagram illustrating a configuration of a base station device 100b (also referred to as a transmission device) according to the sixth embodiment of the present invention. The base station apparatus 100b is different from the base station apparatus 100a (FIG. 1) according to the first embodiment in that the base station apparatus 100b includes a memory unit 103 (also referred to as a storage unit). Parts where the base station apparatus 100b has the same configuration as the base station apparatus 100a are assigned the same reference numerals and description thereof is omitted.
The memory unit 103 temporarily stores transmission data D118 or transmission data D128 output from the baseband unit 101 based on the control of the control unit 102. The transmission data D118 or transmission data D128 stored in the memory unit 103 is read by the control unit 102.

FIG. 14 is a flowchart showing processing of the base station apparatus 100b according to the sixth embodiment of the present invention. Note that in the sixth embodiment, a description of processes that are the same as those in the first embodiment is omitted.
First, the control unit 102 obtains the peak generation timing of the transmission power of the signals transmitted from the antennas 117 and 127 (step S601).

Then, the control unit 102 determines whether or not the transmission power peak generation timings of the signals transmitted from the antennas 117 and 127 coincide with each other (step S602).
If the generation timings match, the control unit 102 determines “YES” in step S602, and the process proceeds to step S603.
And the control part 102 compares the magnitude | size of the peak of the transmission power of the signal transmitted from each antenna 117,127 (step S603).

Then, the control unit 102 records the signal having the larger transmission power peak in the memory unit 103 (step S604). The signal having the smaller transmission power peak is transmitted from the antenna (step S605). Specifically, when the generation timing t11 matches the generation timing t12, the control unit 102 transmits a signal to be transmitted from at least one of the plurality of antennas 117 and 127 (here, the antenna 127) to the receiving device. When the transmission power of the signals recorded in the memory unit 103 and transmitted from the plurality of antennas 117 and 127 to the receiving device is equal to or lower than a predetermined threshold value, the signal recorded in the memory unit 103 is transmitted to at least one antenna (here Then, the antenna 127) is transmitted to the receiving device.
Then, after transmitting the signals processed in steps S604 and S605 from the antennas 117 and 127 to the receiving apparatus, the process proceeds to step S601.

On the other hand, if the generation timings do not match, the control unit 102 determines “NO” in step S602 and proceeds to step S606.
Then, the control unit 102 transmits the transmission data D118 from the antenna 117 and transmits the transmission data D128 from the antenna 127 (step S606).

  In FIG. 13, a case has been described in which a signal having a larger transmission power peak is recorded in the memory unit 103 and a signal having a smaller transmission power peak is transmitted from the antenna first. However, the present invention is limited to this. Instead, the signal having the smaller transmission power peak may be recorded in the memory unit 103, and the signal having the larger transmission power peak may be transmitted from the antenna first.

14 illustrates the case where the process of step S605 is performed after the process of step S604. However, the present invention is not limited to this, and the process of step S604 is performed after the process of step S605. Alternatively, the processing in step S604 and step S605 may be performed simultaneously.
In FIG. 13, the signal output from the baseband unit 101 is recorded in the memory unit 103 by the control unit 102. However, the present invention is not limited to this, and the signal output from the modulation units 111 and 121 is not limited to this. The control unit 102 may record the signal output from the serial / parallel conversion units 112 and 122 in the memory unit 103.

FIG. 15 shows a change in transmission power when the flowchart of FIG. 14 is performed by the base station apparatus 100b according to the sixth embodiment. In FIG. 15, the horizontal axis indicates time, and the vertical axis indicates transmission power.
A curve A6 in FIG. 15 shows a change in power consumption of the transmission power amplification unit 116, a curve B6 in FIG. 15 shows a change in power consumption in the transmission power amplification unit 126, and a curve C6 in FIG. The power consumption added by the amplification unit 116 and the transmission power amplification unit 126 is shown. The overall power consumption of the transmission power amplification unit of the base station apparatus 100b is C6 = A6 + B6.

As shown in FIG. 15, the peak of the curve A6 and the peak of the curve B6 appear at different timings on the curve C6. Thus, unlike the first to fifth embodiments described above, the sixth embodiment causes a temporary delay in the transmission data D128, but the transmission data D118 is transmitted while maintaining the data communication quality. It becomes possible.
Compared with FIG. 6, the generation timing of peak power in the communication device is distributed, and power consumption that increases intensively is reduced.
As a result, the scale of the power supply circuit can be reduced. The transmission data D118 and the transmission data D128 may not only shift the generation timing of the peak power in FIG. 15 but also perform control by the filter units 118 and 128 to reduce power consumption more effectively. .

In the sixth embodiment, one of the transmission data D118 and the transmission data D128 is temporarily recorded in the memory unit 103, and a time difference is provided in the generation timing of the peak power between the transmission data D118 and the transmission data D128, so that the base station apparatus The power consumed in 100b is temporally dispersed, the influence of power supply to other circuits in base station apparatus 100b can be reduced, and the load on the power supply can be reduced.
In the sixth embodiment, the memory unit 103 is provided in the base station device 100b and the processing of the flowchart of FIG. 13 is performed. However, the present invention is not limited to this, and the mobile station device 200 includes the memory unit. 103 may be provided to perform the processing of the flowchart of FIG.

(Seventh embodiment)
Next, a seventh embodiment of the present invention will be described. Since the configuration of the communication apparatus according to the present embodiment is the same as that of the base station apparatus 100a (FIG. 1) according to the first embodiment, the description thereof is omitted.

FIG. 16 is a flowchart showing a process of the base station device 100a according to the seventh embodiment of the present invention. Note that in the seventh embodiment, descriptions of processes that are the same as in the first embodiment are omitted.
First, the control unit 102 obtains the peak generation timing of the transmission power of the signals transmitted from the antennas 117 and 127 (step S701).
Then, the control unit 102 determines whether or not the transmission power peaks of the signals transmitted from the antennas 117 and 127 coincide with each other (step S702).

If the generation timings match, the control unit 102 determines “YES” in step S702 and proceeds to step S703.
And the control part 102 compares the priority of the signal transmitted from each antenna 117,127 (step S703). For example, when the transmission data D118 or D128 is communication control data, data for determining immediacy, or data that does not allow delay, the control unit 102 determines that the priority of the transmission data is high. On the other hand, when the transmission data D118 or D128 is user data or data that allows delay, the control unit 102 determines that the priority of the transmission data is low. Note that the control unit 102 does not determine the priority of the transmission data D118 or D128, but receives notification information requested from the receiving device with which the base station device 100a communicates, and based on the notification information, It is also possible to determine the priority. For example, when transmission of user data is requested by the notification information from the receiving device, the priority of the user data is increased.

Then, the control unit 102 transmits a high priority signal to the receiving device (step S704). And the control part 102 performs step S104 (FIG. 3), S204 (FIG. 8), S304 (FIG. 10), S404 (FIG. 10) demonstrated in the 1st-6th embodiment mentioned above with respect to the low priority signal. The transmission power is reduced by performing at least one process of FIG. 11), S504 (FIG. 12), and S604 (FIG. 14) (step S705). For example, when the process of S604 (FIG. 14) of the sixth embodiment is performed in step S705, the control unit 102 outputs a signal determined to have a low priority when the generation timings coincide with each other (not shown). ), The transmission power of the base station apparatus 100a is reduced.
Then, after transmitting the signals processed in steps S704 and S705 from the antennas 117 and 127 to the receiving apparatus, the process proceeds to step S701.

On the other hand, if the generation timings do not match, the control unit 102 determines “NO” in step S702 and proceeds to step S706.
Then, the control unit 102 transmits signals from the antenna 117 and the antenna 127 to the receiving device (step S706). Specifically, the control unit 102 transmits the transmission data D118 from the antenna 117 to the receiving device, and transmits the transmission data D128 from the antenna 127 to the receiving device.

  FIG. 16 illustrates the case where the process of step S705 is performed after the process of step S704. However, the present invention is not limited to this, and the process of step S704 is performed after the process of step S705. Alternatively, the processing in step S704 and step S705 may be performed simultaneously.

  In the seventh embodiment, when the transmission power peaks of signals transmitted from the antennas 117 and 127 of the base station device 100a to the receiving device coincide with each other, for example, a signal having a low priority is recorded in the memory unit. Then, when the transmission power of the signals transmitted from the plurality of antennas 117 and 127 to the receiving device is equal to or lower than a predetermined threshold, a signal having a low priority recorded in the memory unit is received from the at least one antenna. Since the control unit 102 performs control so that the signal having the higher priority and the signal having the lower priority have the same transmission power peak generation timing, the signal having the higher priority is given priority to the receiving apparatus. Can be sent.

  In the first to seventh embodiments described above, the communication apparatus includes two antennas. However, the present invention is not limited to this. That is, the communication device may include three or more antennas.

  In the first to seventh embodiments described above, the possibility of occurrence of peak power of the communication device is low during the execution of the flowcharts of FIGS. 3, 8, 10, 11, 12, and 14. If the control unit determines that the processing is not performed, the execution of the processes in the flowcharts may be stopped and the normal transmission process (see FIG. 6) may be returned.

The first to seventh embodiments described above may be applied not only to a multicarrier communication system but also to a single carrier communication system.
In the first to seventh embodiments described above, the base station apparatus is a fixed station and the mobile station apparatus is a terminal. However, the present invention is not limited to this. Both the station devices may be fixed stations, or both the base station device and the mobile station device may be terminals.

  According to the first to seventh embodiments described above, in the communication apparatus having a plurality of antennas, when the peak power generation timing overlaps, a difference is made in the peak power control method of each antenna and the peak power generation timing. By providing the method, it is possible to reduce the battery load, effectively reduce the current consumption of the communication device, and reduce the scale of the power supply circuit while maintaining the data communication quality.

  In the embodiment described above, a program for realizing the function of each unit of the communication device (FIGS. 1, 2, 4, 5, and 13) is recorded on a computer-readable recording medium. The communication apparatus may be controlled by causing a computer system to read and execute a program recorded on a recording medium. 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. Further, 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, it is also assumed that a server that holds a program for a certain time, such as a volatile memory inside a computer system that serves as a server or client. The program may be a program 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 a computer system.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and the design and the like within the scope of the present invention are also within the scope of the claims. include.

It is a schematic block diagram which shows the structure by the side of the transmission of the base station apparatus 100a by the 1st Embodiment of this invention. It is a schematic block diagram which shows the structure of the receiving side of the base station apparatus 100a by the 1st Embodiment of this invention. It is a flowchart which shows the process of the base station apparatus 100a by the 1st Embodiment of this invention. It is a schematic block diagram which shows the structure by the side of the transmission of the mobile station apparatus 200 by the 1st Embodiment of this invention. It is a schematic block diagram which shows the structure of the receiving side of the mobile station apparatus 200 by the 1st Embodiment of this invention. It is a figure explaining the effect of the 1st Embodiment of this invention. It is a figure explaining the effect of the 1st Embodiment of this invention. It is a flowchart which shows the process of the base station apparatus 100a by the 2nd Embodiment of this invention. It is a figure explaining the effect of the 2nd Embodiment of this invention. It is a flowchart which shows the process of the mobile station apparatus 200 by the 3rd Embodiment of this invention. It is a flowchart which shows the process of the mobile station apparatus 200 by the 4th Embodiment of this invention. It is a flowchart which shows the process of the base station apparatus 100a by the 5th Embodiment of this invention. It is a schematic block diagram which shows the structure of the base station apparatus 100b (it is also called a transmission apparatus) by the 6th Embodiment of this invention. It is a flowchart which shows the process of the base station apparatus 100b by the 6th Embodiment of this invention. It is a figure explaining the effect of the 6th Embodiment of this invention. It is a flowchart which shows the process of the base station apparatus 100a by the 7th Embodiment of this invention.

Explanation of symbols

100a, 100b ... base station apparatus, 101 ... baseband unit, 102 ... control unit, 103 ... memory unit, 111, 121 ... modulation unit, 118, 128 ... filter unit, 112, 122 ... serial / parallel converter, 113, 123 ... IFFT section, 114, 124 ... parallel / serial converter, 115, 125 ... CP insertion section, 116, 126 ... transmission power amplification 131, antenna, 132, front end, 133, signal separation and sampling unit, 134, serial-to-parallel converter, 135, FFT unit, 136, parallel-to-serial converter 137, demodulator, 138, baseband unit, 139, CPU, 200, mobile station apparatus, 201, baseband unit, 202, control unit, 211, 221.・ Modulation section, 12, 222 ... FFT section, 213, 223 ... filter section, 214, 224 ... subcarrier allocation section, 215, 225 ... IFFT section, 216, 226 ... CP insertion section, 217, 227: Transmission power amplification unit, 231 ... Antenna, 232 ... Front end unit, 233 ... Signal separation sampling unit, 234 ... FFT unit, 235 ... Subcarrier arrangement unit, 236 ... IFFT part, 237 ... demodulation part, 238 ... baseband part, 239 ... CPU

Claims (10)

A transmission device comprising a plurality of antennas for communicating with a reception device,
A determination unit that determines whether or not the peak generation timings of the transmission power of the signals transmitted from the antennas to the reception device match,
When the determination unit determines that the generation timings match, the determination unit determines that the generation timings do not match the transmission powers of signals transmitted from at least one of the plurality of antennas to the reception device. A control unit that reduces the transmission power of the signal transmitted from the antenna to the receiving device when
A transmission device comprising: A filter unit for filtering a signal transmitted from each antenna to the receiving device;
A filter used for filtering of the filter unit with respect to a signal transmitted from at least one of the plurality of antennas to the receiving device when the control unit determines that the transmission power peak generation timings coincide with each other The coefficient is made larger than a filter coefficient used for filtering of the filter unit with respect to a signal transmitted from the antenna to the receiving device when the determination unit determines that the generation timing does not match. Item 2. The transmission device according to Item 1. A modulation unit that modulates a signal to be transmitted from each antenna to the receiving device;
Modulation applied by the modulation unit to a signal transmitted from at least one of the plurality of antennas to the receiving device when the control unit determines that the transmission power peak generation timings coincide with each other When the determination unit determines that the generation timing does not match, the multi-level number of the scheme is made smaller than the multi-level number of the modulation scheme applied by the modulation unit to the signal transmitted from the antenna to the receiving device. The transmission device according to claim 1. A subcarrier arrangement unit that arranges a signal to be transmitted from each antenna to the reception device on a subcarrier;
The subcarrier arrangement unit of a signal to be transmitted to the reception device of at least one of the plurality of antennas is arranged when the control unit determines that the transmission power peak generation timings coincide with each other The subcarrier interval is made larger than the subcarrier interval arranged by the subcarrier arrangement unit of the signal transmitted from the antenna to the receiving device when the determination unit determines that the generation timing does not match. The transmission device according to claim 1. A Fourier transform unit for performing a Fourier transform on a signal transmitted from each antenna to the receiving device;
Fourier applied by the Fourier transform unit of signals transmitted from at least one of the plurality of antennas to the receiving device when the control unit determines that the transmission power peak generation timings coincide with each other From the size or sampling frequency of the Fourier transform applied by the Fourier transform unit to the signal transmitted from the antenna to the receiving device when the determination unit determines that the generation timing does not coincide with the size or sampling frequency of the transform The transmitter according to claim 1, wherein the transmitter is also made smaller. A transmission power amplifying unit for amplifying transmission power of a signal transmitted from each antenna to the receiving device;
The amplification factor of the transmission power amplifying unit for the signal transmitted from at least one of the plurality of antennas to the receiving device when the control unit determines that the transmission power peak generation timings coincide with each other The transmission power amplifying unit with respect to a signal transmitted from the antenna to the receiving device when the determination unit determines that the generation timing does not match is lower than the amplification factor of the transmission power amplification unit. The transmitting device described. A storage unit for storing a signal to be transmitted from each antenna to the receiving device;
When the determination unit determines that the transmission power peak generation timing coincides, the control unit records a signal to be transmitted from at least one of the plurality of antennas to the reception device in the storage unit, and When the transmission power of signals transmitted from a plurality of antennas to the receiving device is equal to or lower than a predetermined threshold, the signals recorded in the storage unit are transmitted from the antenna to the receiving device. The transmission device according to claim 1. A priority determining unit that determines the priority of a signal transmitted from each antenna to the receiving device;
When the determination unit determines that the transmission power peak generation timings coincide with each other, the control unit records the signal determined by the priority determination unit as low priority in the storage unit. The transmission device according to claim 7. A computer of a transmitting device that communicates with a receiving device and includes a plurality of transmitting antennas,
Determining means for determining whether or not the generation timings of transmission power peaks of signals transmitted from the respective antennas to the receiving device match;
When the determination means determines that the generation timing does not match the transmission power of the signal transmitted from at least one of the plurality of antennas to the receiving device when the generation timing is determined to match A program that functions as control means for reducing the transmission power of a signal transmitted from the antenna to the receiving device. A transmission method using a transmission device that communicates with a reception device and includes a determination unit, a control unit, and a plurality of transmission antennas,
A first step of determining whether or not generation timings of transmission power peaks of signals transmitted from the respective antennas to the receiving device coincide with each other;
When the determination unit determines that the transmission power peak generation timings coincide with each other, the control unit determines the transmission power of a signal transmitted from at least one of the plurality of antennas to the reception device as the generation timing. A second step of reducing the transmission power of the signal transmitted from the antenna to the receiving device when the determination means determines that they do not match;
The transmission method characterized by performing.

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