Information processing device, communication device, and information processing method

Abstract

This invention provides an information processing device capable of suppressing the peaks of multiband synthesized signals. [Solution] The information processing device includes: a peak detection unit that detects the peak of a signal based on a multiband signal obtained by combining a first baseband signal and a second baseband signal; a ratio adjustment unit that adjusts the ratio of a first peak suppression signal corresponding to the first baseband signal and a second peak suppression signal corresponding to the second baseband signal according to the amplitude or power of the first baseband signal and the second baseband signal at the timing when the peak is detected; a peak suppression unit that suppresses the peak of the multiband signal using the first peak suppression signal and the second peak suppression signal whose ratio has been adjusted; and an output unit that outputs the multiband signal from which the peak has been suppressed.

Description

[[TECHNICAL FIELD]]

[0001] The present disclosure relates to an information processing apparatus, a communication apparatus, and an information processing method. [[BACKGROUND ART]]

[0002] Conventionally, there is a peak suppression apparatus including a first peak position detection unit, a second peak position detection unit, a suppression signal generation unit, and an addition unit. The first peak position detection unit detects a position on the time axis of the amplitude of a transmission signal as a first peak position when the amplitude change of the transmission signal is convex and exceeds a threshold. The second peak position detection unit detects, as a second peak position, a position separated by a predetermined distance on the time axis from the first peak position detected by the first peak position detection unit when the amplitude of the transmission signal corresponding to said position exceeds the threshold. The suppression signal generation unit generates a suppression signal for suppressing the amplitude of the transmission signal to the threshold or lower using the amplitude and phase of the transmission signal corresponding to the first peak position and the second peak position detected by the first peak position detection unit and the second peak position detection unit. The addition unit adds the suppression signal generated by the suppression signal generation unit to the transmission signal (see, for example, Patent Document 1).

[0003] Further, conventionally, there is a communication apparatus including peak suppression means, digital-to-analog conversion means, frequency conversion means, combining means, and amplification means. The peak suppression means calculates, as a maximum power value, the power of a combined signal of a first baseband signal and a second baseband signal when the phase of a first carrier wave matches the phase of a second carrier wave, generates a first suppression signal and a second suppression signal having non-zero values when the maximum power value is larger than a power threshold, generates a third baseband signal by reflecting the value of the first suppression signal in the first baseband signal, and generates a fourth baseband signal by reflecting the value of the second suppression signal in the second baseband signal (see, for example, Patent Document 2). [[PRIOR ART DOCUMENT]] [[PATENT DOCUMENT]]

[0004] [Patent Document 1] Japanese Patent Publication No. 2013-118447 [Patent Document 2] International Publication No. 2014 / 141335 [Overview of the project] [Problems that the invention aims to solve]

[0005] The peak suppression device described in Patent Document 1 is a single-band device, while the communication device described in Patent Document 2 is a multi-band device.

[0006] Incidentally, in multiband equipment capable of peak suppression, if the IBW (Instantaneous Bandwidth) of the multiband composite signal becomes large, there is a risk that peak suppression may cease to function even if it is strengthened.

[0007] Therefore, the objective is to provide an information processing device, a communication device, and an information processing method capable of suppressing the peaks of multiband combined signals. [Means for solving the problem]

[0008] The information processing apparatus in this embodiment includes: a peak detection unit that detects peaks in a signal based on a multiband signal obtained by combining a first baseband signal and a second baseband signal; a ratio adjustment unit that adjusts the ratio of a first peak suppression signal corresponding to the first baseband signal and a second peak suppression signal corresponding to the second baseband signal according to the amplitude or power of the first baseband signal and the second baseband signal at the timing when the peak is detected; a peak suppression unit that suppresses the peaks of the multiband signal using the first peak suppression signal and the second peak suppression signal whose ratios have been adjusted; and an output unit that outputs the multiband signal from which the peaks have been suppressed. [Effects of the Invention]

[0009] This invention provides an information processing device, a communication device, and an information processing method capable of suppressing the peaks of multiband combined signals. [Brief explanation of the drawing]

[0010] [Figure 1] This figure shows an example of the configuration of RU10 in the embodiment. [Figure 2] This figure shows an example of the configuration of the peak suppression device 100 of the embodiment. [Figure 3] This diagram illustrates an example of peak detection by the peak detection unit 120. [Figure 4] This flowchart shows an example of the process performed by the peak suppression device 100. [Figure 5] This figure shows an example of the relationship between the signal levels of the baseband signals x1(n) and x2(n) of bands 1 and 2, and the first and second peak suppression signals. [Figure 6] This figure shows an example of peak suppression using a comparative peak suppression device. [Figure 7] This figure shows an example of peak suppression using the peak suppression device 100. [Figure 8] This figure shows an example of the configuration of the peak suppression device 100M1 in a modified example of the embodiment 1. [Figure 9] This flowchart shows an example of the process performed by the peak suppression device 100M1. [Figure 10] This figure shows an example of the configuration of the peak suppression device 100M2 in a modified example of the embodiment 2. [Figure 11] This figure shows an example of the configuration of the peak suppression device 100M3 in the modified embodiment 3. [Figure 12] This flowchart shows an example of the process performed by the peak suppression device 100M3. [Figure 13] This figure shows an example of the configuration of the peak suppression device 100M4 in the modified embodiment 4. [Figure 14]It is a diagram illustrating an example of a first impulse response signal and a second impulse response signal output by impulse response generators 150MA and 150MB after shifting frequencies for bands 1 and 2. [Figure 15] It is a diagram illustrating an example configuration of a peak suppression apparatus 100M5 according to Modification 5 of the embodiment. Mode for Carrying Out the Invention

[0011] Hereinafter, embodiments to which the information processing apparatus, communication apparatus, and information processing method of the present disclosure are applied will be described.

[0012] <Embodiment> FIG. 1 is a diagram illustrating an example configuration of an RU (Radio Unit) 10 according to an embodiment. The RU 10 is an example of a communication apparatus, which is a so-called base station. The RU 10 is provided between a CU (Central Unit) including a DU (Distributed Unit) and an antenna 1.

[0013] As an example, radio waves transmitted or received by the RU 10 via the antenna 1 may be radio waves in a millimeter wave band for fifth-generation mobile communication systems (5G), radio waves in a frequency band of 1 GHz to 30 GHz including Sub-6, or radio waves in an ultra-high frequency band of 100 GHz or higher assumed for sixth-generation mobile communication systems (6G) or the like.

[0014] In recent years, multiband RUs have been increasingly popular as a countermeasure against the increase in communication traffic. Whereas conventional single-band RUs require a separate power amplifier for each band, multiband RUs commonly amplify multiband signals with a single power amplifier, which reduces the number of devices, decreases the mounting area, and allows for miniaturization of the apparatus. Accordingly, space saving in installation locations and improvement of installation efficiency can be achieved. The RU 10 according to the embodiment supports multiband communication.

[0015] <ru10> RU10 includes a digital section 20, a DAC (Digital to Analog Converter) 30, and an analog section 40. The digital section 20 can be implemented, for example, as an FPGA (Field Programmable Gate Array). The analog section 40 is an example of a transmission circuit.

[0016] The digital unit 20 includes a transmission signal generation unit 21, a peak suppression device 100, frequency shift units 22A and 22B, and an adder 23. The peak suppression device 100 is an example of an information processing device. The peak suppression method performed by the peak suppression device 100 is an example of an information processing method.

[0017] The digital section 20 may be implemented by a computer including a CPU (Central Processing Unit), RAM (Random Access Memory), ROM (Read Only Memory), input / output interface, and internal bus. In this case, the CPU can execute a program to implement the functions of the transmission signal generation section 21, the peak suppression device 100, the frequency shift sections 22A and 22B, and the adder 23.

[0018] The transmission signal generation unit 21 is capable of generating multiband baseband signals (transmission signals), and as an example, it generates a baseband signal for two bands. The peak suppression device 100 performs peak suppression on the two-band baseband signal input from the transmission signal generation unit 21. The two-band baseband signal, after peak suppression by the peak suppression device 100, is input to frequency shift units 22A and 22B, respectively, and shifted to the frequencies for the first band and the second band. The baseband signals whose frequencies have been shifted by the frequency shift units 22A and 22B are combined by the adder 23 and output as a combined transmission signal. Details of the peak suppression device 100 will be explained using Figure 2 and subsequent figures.

[0019] The DAC30 converts the combined transmission signal, synthesized by the adder23, into an analog transmission signal and outputs it to the analog section40.

[0020] The analog section 40 includes a multiplier 41, an oscillator 42, a PA (Power Amplifier) ​​43, and a BPF (Band Pass Filter) 44. The multiplier 41 multiplies the analog transmission signal input from the DAC 30 with the upconversion signal input from the oscillator 42 and outputs it to the PA 43. The oscillator 42 functions as an upconverter. PA43 amplifies the up-converted analog transmission signal and outputs it to BPF44. BPF44 transmits only the desired bandwidth of the analog transmission signal amplified by PA43 and outputs it to antenna 1.

[0021] <Peak suppression device 100> Figure 2 shows an example of the configuration of the peak suppression device 100 according to the embodiment.

[0022] The peak suppression device 100 includes input terminals 101A, 101B, output terminals 102A, 102B, NCOs (Numerically controlled oscillators) 110A, 110B, adder 115, peak detection unit 120, adjustment signal generation unit 130, amplitude calculation units 140A, 140B, ratio calculation unit 145, impulse response generation units 150A, 150B, multipliers 155A1, 155A2, multipliers 155B1, 155B2, delay units 160A, 160B, and subtractors 170A, 170B.

[0023] Input terminal 101A is an example of a first input terminal, and input terminal 101B is an example of a second input terminal. NCO110A is an example of a first frequency shift unit, and NCO110B is an example of a second frequency shift unit. Adder 115 is an example of a first adder. Amplitude calculation unit 140A is an example of a first amplitude calculation unit, and amplitude calculation unit 140B is an example of a second amplitude calculation unit. Ratio calculation unit 145 is an example of a ratio derivation unit. Impulse response generation unit 150A is an example of a first impulse response generation unit, and impulse response generation unit 150B is an example of a second impulse response generation unit. Multipliers 155A1 and 155A2 are examples of first multiplication units, and multipliers 155B1 and 155B2 are examples of second multiplication units. Multipliers 155A1 and 155A2 and multipliers 155B1 and 155B2 are examples of peak suppression signal generation units. Subtractor 170A is an example of a first subtraction unit, and subtractor 170B is an example of a second subtraction unit. Subtractors 170A and 170B are examples of peak suppression units. Amplitude calculation units 140A and 140B, ratio calculation unit 145, impulse response generation units 150A and 150B, multipliers 155A1, 155A2, and multipliers 155B1 and 155B2 are examples of ratio adjustment units.

[0024] Since the digital section 20 is implemented as an FPGA, for example, the peak suppression device 100 is also implemented as an FPGA. However, the peak suppression device 100 may also be implemented as a computer. In this case, the CPU can execute a program to implement the functions of NCO 110A, 110B, adder 115, peak detection unit 120, adjustment signal generation unit 130, amplitude calculation units 140A, 140B, ratio calculation unit 145, impulse response generation units 150A, 150B, multipliers 155A1, 155A2, multipliers 155B1, 155B2, delay units 160A, 160B, and subtractors 170A, 170B.

[0025] <Input terminals 101A, 101B> Input terminals 101A and 101B are connected to the transmit signal generation unit 21 (see Figure 1) and are terminals to which baseband signals x1(n) and x2(n) are input. Inside the peak suppression device 100, input terminals 101A and 101B are connected to NCO110A and NCO110B and amplitude calculation units 140A and 140B.

[0026] Baseband signal x1(n) is an example of a first baseband signal, and baseband signal x2(n) is an example of a second baseband signal. The frequencies of baseband signals x1(n) and x2(n) are equal, for example, but they may be different.

[0027] Note that n is the time index of the baseband signals x1(n) and x2(n). For example, if the baseband signals x1(n) and x2(n) are 5G baseband signals, the time index will be the time index specified in the 5G standard, etc.

[0028] <Output terminals 102A, 102B> Output terminals 102A and 102B are connected to frequency shift units 22A and 22B (see Figure 1), respectively, and output baseband signals xout1(n) and xout2(n), respectively. Baseband signals xout1(n) and xout2(n) are examples of signals of the first frequency and second frequency, respectively. Inside the peak suppression device 100, output terminals 102A and 102B are connected to the output terminals of subtractors 170A and 170B.

[0029] The baseband signals xout1(n) and xout2(n) are transmission signals whose peaks have been suppressed by the peak suppression device 100. They are then shifted to the frequencies for the first band and the second band by the frequency shifting units 22A and 22B, and then combined by the adder 23 to be output as a combined transmission signal.

[0030] <NCO110A、NCO110B> NCO110A shifts the frequency of baseband signal x1(n) to the frequency for the first band. NCO110B shifts the frequency of baseband signal x2(n) to the frequency for the second band.

[0031] The first and second bands are, for example, two bands separated by two or three or more bands. The difference in bandwidth between the first and second bands is, for example, about 300 MHz, and they are separated by five or more bands. Note that the effects described later will also be observed even if the first and second bands are, for example, two adjacent bands.

[0032] The output terminals of NCO110A and NCO110B are connected to the adder 115 and the adjustment signal generation unit 130.

[0033] <Adder 115> The output terminal of the adder 115 is connected to the peak detection unit 120. The adder 115 outputs a combined signal to the peak detection unit 120, which is the sum of the baseband signals x1(n) and x2(n) input from NCO110A and NCO110B.

[0034] <Peak detection unit 120> The output terminal of the peak detection unit 120 is connected to the adjustment signal generation unit 130. The peak detection unit 120 detects the peak of the composite signal input from the adder 115 and outputs the amplitude A and phase θ of the peak of the composite signal to the adjustment signal generation unit 130.

[0035] When the peak detection unit 120 detects a peak in the composite signal, it notifies the ratio calculation unit 145 and the impulse response generation units 150A and 150B of a peak timing notification signal, as shown by the dashed arrow.

[0036] <Adjustment signal generation unit 130> The adjustment signal generation unit 130 is connected to input terminals 101A and 101B, NCO 110A and NCO 110B, multipliers 155A1 and 155B1, and the peak detection unit 120. The peak detection unit 120 inputs the amplitude A and phase θ of the peak of the composite signal to the adjustment signal generation unit 130 when the peak detection unit 120 detects the peak of the composite signal.

[0037] When the amplitude A and phase θ of the peak of the combined signal are input to the peak detection unit 120, the adjustment signal generation unit 130 acquires the phase φ1 of the baseband signal x1(n), the phase φ2 of the baseband signal x2(n), the phase θ1 of the baseband signal x1(n) shifted to the frequency for the first band, and the phase θ2 of the baseband signal x2(n) shifted to the frequency for the second band at that timing. The baseband signal x1(n) shifted to the frequency for the first band is the output of NCO110A, and the baseband signal x2(n) shifted to the frequency for the second band is the output of NCO110B.

[0038] The adjustment signal generation unit 130 has a threshold th for the amplitude A of the peak of the composite signal. When the adjustment signal generation unit 130 obtains the amplitude A and phase θ of the peak of the composite signal, and the phases φ1, φ2, θ1, and θ2 at the timing when the peak is detected, it generates adjustment signals B1 and B2.

[0039] Adjustment signal B1 is an example of a first adjustment signal and is output to multiplier 155A2. Adjustment signal B2 is an example of a second adjustment signal and is output to multiplier 155B2. Adjustment signals B1 and B2 are signals that adjust the amplitude and phase of the first and second impulse response signals, respectively.

[0040] The adjustment signals B1 and B2 are expressed by the following equations (1) and (2).

number

number

[0041] The amplitudes of adjustment signals B1 and B2 have the value obtained by subtracting the threshold th from the peak amplitude A of the combined signal (A-th). That is, the amplitudes of adjustment signals B1 and B2 correspond to the excess amount when the peak amplitude A of the combined signal exceeds the threshold th. Furthermore, adjustment signal B1 has a phase (θ-θ1+φ1) obtained by subtracting the difference between phases θ1 and φ1 from the phase θ of the peak of the combined signal. Adjustment signal B2 has a phase (θ-θ2+φ2) obtained by subtracting the difference between phases θ2 and φ2 from the phase θ of the peak of the combined signal.

[0042] To set the amplitudes of the first and second peak suppression signals, which suppress the peaks of the baseband signals x1(n) and x2(n), to (A-th), the amplitudes of adjustment signals B1 and B2 are set to (A-th). Furthermore, after the baseband signals xout1(n) and xout2(n) are shifted to the frequencies for the first and second bands in the frequency shift sections 22A and 22B and finally combined, the phases of adjustment signals B1 and B2 are set to (θ-θ1+φ1) and (θ-θ2+φ2) so that the peaks of the combined baseband signals are suppressed.

[0043] <Amplitude calculation section 140A, 140B> The amplitude calculation unit 140A has an input terminal connected to the input terminal 101A and an output terminal connected to the ratio calculation unit 145. The amplitude calculation unit 140B has an input terminal connected to the input terminal 101B and an output terminal connected to the ratio calculation unit 145.

[0044] The amplitude calculation units 140A and 140B calculate the first amplitude D1n and the second amplitude D2n of the baseband signals x1(n) and x2(n) input from the input terminals 101A and 101B, and output them to the ratio calculation unit 145.

[0045] <Ratio calculation unit 145> The ratio calculation unit 145 calculates the first ratio of the first amplitude D1n to the first amplitude D1n and the second amplitude D2n {D1n / (D1n+D2n)} and the second ratio of the second amplitude D2n to the first amplitude D1n and the second amplitude D2n {D2n / (D1n+D2n)} at the timing when the peak is detected by the peak detection unit 120.

[0046] The two output terminals of the ratio calculation unit 145 are connected to one input terminal of the multiplier 155A1 and one input terminal of the multiplier 155B1, respectively. The ratio calculation unit 145 outputs the first ratio {D1n / (D1n+D2n)} and the second ratio {D2n / (D1n+D2n)} to the multipliers 155A1 and 155B1, respectively.

[0047] <Impulse response generation unit 150A, 150B> The output terminals of the impulse response generation units 150A and 150B are connected to the other input terminal of the multiplier 155A1 and the other input terminal of the multiplier 155B1, respectively. When a peak timing notification signal is input from the peak detection unit 120, the impulse response generation units 150A and 150B output a first impulse response signal and a second impulse response signal to the multipliers 155A1 and 155B1, respectively.

[0048] Furthermore, the impulse response generation units 150A and 150B generate the impulse response by dividing the Sinc function into finite time segments. This allows for miniaturization of the digital unit 20.

[0049] <Multipliers 155A1, 155B1> Multipliers 155A1 and 155B1 each have an output terminal connected to one of the input terminals of multipliers 155A2 and 155B2, respectively. Multiplier 155A1 multiplies the first impulse response signal by the first ratio {D1n / (D1n+D2n)} and outputs the first impulse response signal multiplied by the first ratio {D1n / (D1n+D2n)} to multiplier 155A2. Multiplier 155B1 multiplies the second impulse response signal by the second ratio {D2n / (D1n+D2n)} and outputs the second impulse response signal multiplied by the second ratio {D2n / (D1n+D2n)} to multiplier 155B2.

[0050] <Multipliers 155A2, 155B2> Multipliers 155A2 and 155B2 each have output terminals connected to the negative input terminals of subtractors 170A and 170B, respectively. Multiplier 155A2 generates a first peak suppression signal by complex multiplying the first impulse response signal, which has been multiplied by a first ratio {D1n / (D1n+D2n)}, by the adjustment signal B1. Multiplier 155B2 generates a second peak suppression signal by complex multiplying the second impulse response signal, which has been multiplied by a second ratio {D2n / (D1n+D2n)}, by the adjustment signal B2. Multipliers 155A2 and 155B2 output the first peak suppression signal and the second peak suppression signal to the negative input terminals of subtractors 170A and 170B, respectively.

[0051] <Delay section 160A, 160B> The delay unit 160A is inserted in series between the input terminal 101A and the positive input terminal of the subtractor 170A. The delay unit 160A imparts a delay time equal to the time it takes for the baseband signal x1(n) input from the input terminal 101A to reach the subtractor 170A via the NCO 110A, adder 115, peak detection unit 120, adjustment signal generation unit 130, and multiplier 155A2, and outputs this delay time to the positive input terminal of the subtractor 170A.

[0052] Similarly, the delay unit 160B is inserted in series between the input terminal 101B and the positive input terminal of the subtractor 170B. The delay unit 160B imparts a delay time equal to the time it takes for the baseband signal x2(n) input from the input terminal 101B to reach the subtractor 170B via the NCO 110B, adder 115, peak detection unit 120, adjustment signal generation unit 130, and multiplier 155B2, to the baseband signal x2(n) input from the input terminal 101B and outputs it to the positive input terminal of the subtractor 170B. The delay times imparted by the delay units 160A and 160B to the baseband signals x1(n) and x2(n) are equal.

[0053] <Subtractors 170A, 170B> Subtractors 170A and 170B each have output terminals connected to output terminals 102A and 102B, respectively. Subtractor 170A generates baseband signal xout1(n) by subtracting a first peak suppression signal from baseband signal x1(n) input from delay unit 160A. Subtractor 170B generates baseband signal xout2(n) by subtracting a second peak suppression signal from baseband signal x2(n) input from delay unit 160B. Subtractors 170A and 170B output baseband signals xout1(n) and xout2(n) to output terminals 102A and 102B.

[0054] <Explanation using mathematical formulas> The combined signal x(n) of baseband signals x1(n) and x2(n) is expressed by the following equation (3).

number

[0055] The amplitudes D1n, D2n, and Dn of the baseband signals x1(n), x2(n), and the combined signal x(n) are expressed as follows:

number

[0056] Furthermore, the time index n when the peak of the amplitude of the composite signal is detected by the peak detection unit 120 is set to N. PL The impulse response coefficients of the first impulse response signal and the second impulse response signal are BB. IMP1 BB IMP2 Therefore, the first peak suppression signal cp1(n+N) applied to the baseband signals x1(n) and x2(n) is PL ), the second peak suppression signal cp2(n+N PL ) is expressed by the following equations (5A) and (5B).

[0057]

number

[0058] The baseband signals xout1(n) and xout2(n) output from subtractors 170A and 170B are expressed by the following equations (6A) and (6B).

number

[0059] <Peak detection by peak detection unit 120> Figure 3 illustrates an example of peak detection by the peak detection unit 120. In Figure 3, the horizontal axis represents time, with the time index n ranging from 0 to 9. The vertical axis represents the amplitude Dn of the composite signal, with the threshold th being the threshold value.

[0060] For example, when the time index n is between 0 and 9, if the peak detection unit 120 detects the amplitude Dn of the composite signal as shown in Figure 3, then when the time index n is 6, the amplitude D6 exceeds the threshold th. As a result, the peak detection unit 120 sets the amplitude A of the peak of the composite signal to the amplitude D6 when the time index n is 6.

[0061] <Flowchart> Figure 4 is a flowchart showing an example of the process performed by the peak suppression device 100.

[0062] The peak detection unit 120 determines whether the amplitude Dn of the composite signal x(n) is greater than the threshold th (step S1).

[0063] When the peak detection unit 120 determines that the amplitude Dn of the composite signal x(n) is greater than the threshold th (S1:YES), the peak suppression device 100 processes steps S2A, S2B, S2C1, and S2C2 in parallel.

[0064] The ratio calculation unit 145 calculates the first ratio {D1n / (D1n+D2n)} and the second ratio {D2n / (D1n+D2n)} (step S2A).

[0065] The impulse response generation units 150A and 150B generate a first impulse response signal and a second impulse response signal, respectively (step S2B).

[0066] The peak detection unit 120 defines A as the peak of the amplitude Dn of the composite signal x(n) (step S2C1). That is, A = Dn.

[0067] The adjustment signal generation unit 130 generates adjustment signals B1 and B2 (step S2C2).

[0068] Multipliers 155A1 and 155A2, and multipliers 155B1 and 155B2 perform multiplication (step S3). That is, multipliers 155A1 and 155A2 multiply the first impulse response signal by the first ratio {D1n / (D1n+D2n)}, and complex multiply the first impulse response signal multiplied by the first ratio {D1n / (D1n+D2n)} by the adjustment signal B1 to generate a first peak suppression signal. Multipliers 155B1 and 155B2 multiply the second impulse response signal by the second ratio {D2n / (D1n+D2n)}, and complex multiply the second impulse response signal multiplied by the second ratio {D2n / (D1n+D2n)} by the adjustment signal B2 to generate a second peak suppression signal.

[0069] Subtractors 170A and 170B perform subtraction processing (step S4). Specifically, subtractor 170A subtracts the first peak suppression signal from the baseband signal x1(n) to generate the baseband signal xout1(n). Subtractor 170B subtracts the second peak suppression signal from the baseband signal x2(n) to generate the baseband signal xout2(n).

[0070] The peak suppression device 100 completes the series of processes described above. The peak suppression device 100 then repeatedly executes the processes from steps S1 to S4.

[0071] In step S1, if the peak detection unit 120 determines that the amplitude Dn of the composite signal x(n) is not greater than the threshold th (S1:NO), the peak suppression device 100 outputs the baseband signals x1(n) and x2(n) input to the input terminals 101A and 101B from the output terminals 102A and 102B without performing peak suppression.

[0072] <First peak suppression signal, second peak suppression signal> Figure 5 shows an example of the relationship between the signal levels of the baseband signals x1(n) and x2(n) of bands 1 and 2, and the first and second peak suppression signals. Bands 1 and 2 are examples of the first and second bands.

[0073] In Figure 5, the baseband signals x1(n) and x2(n) are shown in white, and the first peak suppression signal is shown with hatching. The baseband signal x1(n) and the first peak suppression signal are shown superimposed, as are the baseband signal x2(n) and the second peak suppression signal.

[0074] The signal levels of baseband signals x1(n) and x2(n) change moment by moment each time the time index n changes, and therefore are almost always significantly different, as shown in Figure 5. At a given time index, the signal levels of baseband signals x1(n) and x2(n) are almost never nearly identical.

[0075] The peak suppression device 100 uses the first amplitude D1n and second amplitude D2n of the baseband signals x1(n) and x2(n) to calculate the first ratio {D1n / (D1n+D2n)} and the second ratio {D2n / (D1n+D2n)} at the timing when the peak is detected by the peak detection unit 120.

[0076] Furthermore, the first peak suppression signal and the second peak suppression signal are generated based on the first impulse response signal, the second impulse response signal, the first ratio {D1n / (D1n+D2n)}, the second ratio {D2n / (D1n+D2n)}, and the adjustment signals B1 and B2.

[0077] Therefore, the peak suppression device 100 can primarily suppress the peak component of the baseband signal xout1(n) and baseband signal xout2(n) included in the combined transmission signal synthesized by the adder 23 (see Figure 1) that has a larger ratio (first ratio or second ratio) calculated by the ratio calculation unit 145.

[0078] <Peak suppression using a comparative peak suppression device> Figure 6 shows an example of peak suppression using a comparative peak suppression device. In Figure 6, the horizontal axis represents time (time index). The vertical axis represents the signal level as PAPR (Peak-to-Average Power Ratio). In Figure 6, the PAPR of the peak-suppressed composite transmission signal is shown as a solid line, the PAPR of the composite transmission signal before peak suppression is shown as a dashed line, and the PAPR of the composite peak-suppressed signal obtained by combining peak-suppressed signals 1 and 2 for bands 1 and 2, generated by the comparative peak suppression device, is shown as a dashed line. The threshold value TH1 of the PAPR of the peak-suppressed composite transmission signal is also shown.

[0079] Here, the PAPR of the peak-suppressed composite transmit signal is the PAPR of the signal obtained by subtracting the composite peak-suppressed signal from the composite signal before peak suppression.

[0080] The comparative peak suppression device, like the peak suppression device 100 in the embodiment shown in Figure 2, does not include a ratio calculation unit 145 and does not calculate the first ratio {D1n / (D1n+D2n)} and the second ratio {D2n / (D1n+D2n)}.

[0081] Therefore, in the comparative peak suppression device, the signal levels of peak suppression signals 1 and 2 for bands 1 and 2 are equal, as shown inside the blown-out section in Figure 6. This is because peak suppression signals 1 and 2 are common peak suppression signals.

[0082] Furthermore, Bands 1 and 2 are not signals from two adjacent bands, but rather two bands separated by two or more bands. The difference in bandwidth between Bands 1 and 2 is approximately 300 MHz, for example.

[0083] Thus, when the signal levels of two peak suppression signals 1 and 2, which have somewhat different frequencies, are equal, the waveform of the combined peak suppression signal obtained by combining peak suppression signals 1 and 2 will repeatedly increase and decrease with a period corresponding to the frequency difference between bands 1 and 2, resulting in a waveform where there are moments when the signal level becomes negative.

[0084] Thus, if the combined peak suppression signal, which repeatedly increases and decreases with a period corresponding to the frequency difference between bands 1 and 2, is subtracted from the combined transmission signal before peak suppression, there may be sections in the peak-suppressed combined transmission signal where the PAPR does not fall below the threshold TH1. In this case, it is not possible to suppress the peaks of the combined transmission signal, which is a combination of two baseband signals from bands 1 and 2 that have somewhat different frequencies.

[0085] <Peak suppression in peak suppression device 100> Figure 7 shows an example of peak suppression by the peak suppression device 100. In Figure 7, the horizontal axis represents time (time index). The vertical axis represents the signal level as PAPR (Peak-to-Average Power Ratio). In Figure 7, the PAPR of the peak-suppressed composite transmission signal is shown as a solid line, the PAPR of the composite transmission signal before peak suppression is shown as a dashed line, and the PAPR of the composite peak-suppressed signal obtained by combining the first peak-suppressed signal and the second peak-suppressed signal generated by the peak suppression device 100 is shown as a dashed line. The threshold value TH1 of the PAPR of the peak-suppressed composite transmission signal is also shown.

[0086] Here, the PAPR of the peak-suppressed composite transmit signal is the PAPR of the signal obtained by subtracting the composite peak-suppressed signal from the composite signal before peak suppression.

[0087] The peak suppression device 100 includes a ratio calculation unit 145 and generates separate first and second peak suppression signals for bands 1 and 2 using a first ratio {D1n / (D1n+D2n)}, a second ratio {D2n / (D1n+D2n)}, and adjustment signals B1 and B2 for bands 1 and 2.

[0088] As shown in Figure 5, the signal levels of the first and second peak suppression signals correspond to the first amplitude D1n and second amplitude D2n of the baseband signals x1(n) and x2(n). As shown in Figure 5, if the signal level of the baseband signal x1(n) is significantly higher than the signal level of the baseband signal x2(n), the signal levels of the first and second peak suppression signals will differ greatly, resulting in a state where only the first peak suppression signal exists and the second peak suppression signal does not.

[0089] The waveform of the combined peak suppression signal, obtained by combining the first and second peak suppression signals, is as shown in Figure 7, and it gradually increases and decreases with a long period corresponding to the frequency of the first peak suppression signal.

[0090] Thus, by subtracting a composite peak suppression signal, which has a waveform that gradually increases and decreases over a long period, from the composite transmission signal before peak suppression, the PAPR of the peak-suppressed composite transmission signal becomes less than or equal to the threshold TH1, and the peak of the composite transmission signal can be suppressed.

[0091] As described above, the peak suppression device 100 of this embodiment can primarily suppress the peak component with the larger ratio (first ratio or second ratio) calculated by the ratio calculation unit 145 among the baseband signals xout1(n) and xout2(n) components included in the combined transmission signal (multiband combined signal) synthesized by the adder 23 (see Figure 1).

[0092] Therefore, a peak suppression device 100 capable of suppressing the peaks of a multiband composite signal can be provided. Furthermore, in the above, the first band and the second band have been described as, for example, two bands separated by two or three or more bands. That is, the first band and the second band The case where IBW is large has been explained. However, the first and second bands may be, for example, two adjacent bands, and peak suppression of the multiband composite signal is possible even in such cases.

[0093] <Modified Examples 1-5 of the Embodiment: Peak Suppression Devices 100M1-100M5> The following describes the peak suppression devices 100M1 to 100M5 of modified embodiments 1 to 5. Components similar to those of the peak suppression device 100 of the embodiment described with reference to Figures 1 to 7 are denoted by the same reference numerals and their descriptions are omitted.

[0094] <Example 1> Figure 8 shows an example of the configuration of the peak suppression device 100M1 of the modified embodiment 1. The peak suppression device 100M1 has a configuration in which a ratio output control unit 146 is provided between the ratio calculation unit 145 of the peak suppression device 100 and the multipliers 155A1 and 155B.

[0095] The ratio output control unit 146 outputs the first ratio {D1n / (D1n+D2n)} and the second ratio {D2n / (D1n+D2n)} calculated by the ratio calculation unit 145 to the multipliers 155A1 and 155B1, respectively, if the first ratio {D1n / (D1n+D2n)} or the second ratio {D2n / (D1n+D2n)} calculated by the ratio calculation unit 145 is greater than or equal to a predetermined ratio B. Furthermore, if the first ratio {D1n / (D1n+D2n)} or the second ratio {D2n / (D1n+D2n)} calculated by the ratio calculation unit 145 is less than a predetermined ratio B, the ratio output control unit 146 sets the first ratio {D1n / (D1n+D2n)} and the second ratio {D2n / (D1n+D2n)} to a predetermined ratio and outputs them to the multipliers 155A1 and 155B1. Setting the first ratio {D1n / (D1n+D2n)} and the second ratio {D2n / (D1n+D2n)} to predetermined ratios means that no adjustments are made based on the first and second ratios (no ratio adjustment). Note that predetermined ratio B is an example of a third ratio, and the predetermined ratio is an example of a fourth ratio.

[0096] <Flowchart> Figure 9 is a flowchart showing an example of the process performed by the peak suppression device 100M1. The process shown in Figure 9 includes steps S2A1, S2A2, and S2A3 instead of step S2A shown in Figure 4.

[0097] The ratio calculation unit 145 calculates a first ratio {D1n / (D1n+D2n)} and a second ratio {D2n / (D1n+D2n)}, and determines whether the first ratio {D1n / (D1n+D2n)} or the second ratio {D2n / (D1n+D2n)} is greater than or equal to a predetermined ratio B (step S2A1).

[0098] If the ratio calculation unit 145 determines that at least one of the first ratio {D1n / (D1n+D2n)} or the second ratio {D2n / (D1n+D2n)} is greater than or equal to a predetermined ratio B (S2A1: YES), it outputs the first ratio {D1n / (D1n+D2n)} and the second ratio {D2n / (D1n+D2n)} to the multipliers 155A1 and 155B1 (step S2A2). As a result, the peak suppression device 100M1 performs peak suppression.

[0099] Furthermore, if the ratio calculation unit 145 determines that both the first ratio {D1n / (D1n+D2n)} or the second ratio {D2n / (D1n+D2n)} are less than the predetermined ratio B (S2A1: NO), it sets the first ratio {D1n / (D1n+D2n)} and the second ratio {D2n / (D1n+D2n)} to predetermined ratios and outputs them to the multipliers 155A1 and 155B1 (step S2A3). In this case, since both the first ratio {D1n / (D1n+D2n)} or the second ratio {D2n / (D1n+D2n)} are set to predetermined ratios, the peak suppression device 100M1 does not perform ratio adjustment at peak timing.

[0100] As described above, the peak suppression device 100M1, like the peak suppression device 100, can primarily suppress the peak component with the larger ratio (first ratio or second ratio) calculated by the ratio calculation unit 145 among the baseband signals xout1(n) and xout2(n) included in the combined transmission signal synthesized by the adder 23 (see Figure 1).

[0101] Furthermore, if the first ratio {D1n / (D1n+D2n)} and the second ratio {D2n / (D1n+D2n)} are less than the predetermined ratio B, the ratio adjustment at the peak timing is not performed, thereby efficiently and effectively suppressing the peak component with the larger ratio calculated by the ratio calculation unit 145.

[0102] <Modification 2> Figure 10 shows an example of the configuration of the peak suppression device 100M2 in a modified example of the embodiment 2. The peak suppression device 100M2 has a configuration in which the ratio calculation unit 145 of the peak suppression device 100 is replaced with a ratio calculation unit 145M.

[0103] The ratio calculation unit 145 of the peak suppression device 100M2 includes a RAM 145R and a subtractor 145S. RAM 145R is an example of a storage unit. Subtractor 145S is an example of a subtraction unit.

[0104] The RAM145R receives the first amplitude D1n and the second amplitude D2n of the baseband signals x1(n) and x2(n), respectively, from the amplitude calculation units 140A and 140B.

[0105] The output terminal of RAM145R is connected to one input terminal of multiplier 155A1 and the positive input terminal of subtractor 145S. The negative input terminal of subtractor 145S has a value of 1 input to it. The output terminal of subtractor 145S is connected to one input terminal of multiplier 155B1.

[0106] RAM145R stores ratio data that associates the first amplitude D1n and the second amplitude D2n with the first ratio {D1n / (D1n+D2n)} of the first amplitude D1n. RAM145R outputs the first ratio {D1n / (D1n+D2n)} corresponding to the first amplitude D1n and the second amplitude D2n at the timing when the peak is detected by the peak detection unit 120.

[0107] The subtractor 145S calculates the second ratio {D2n / (D1n+D2n)} by subtracting the first ratio {D1n / (D1n+D2n)} output from RAM 145R from 1, and outputs it to the multiplier 155B1.

[0108] Therefore, the peak suppression device 100M2 can operate in the same way as the peak suppression device 100.

[0109] As described above, the peak suppression device 100M2, like the peak suppression device 100, can primarily suppress the peak component with the larger ratio (first ratio or second ratio) calculated by the ratio calculation unit 145 among the baseband signals xout1(n) and xout2(n) included in the combined transmission signal synthesized by the adder 23 (see Figure 1).

[0110] Furthermore, a peak suppression device 100 (information processing device) capable of suppressing the peaks of a multiband combined signal can be provided, with a ratio calculation unit 145 having a RAM 145R that stores ratio data and a subtractor 145S. Since the ratio calculation unit 145 can be implemented with RAM 145R and subtractor 145S, the configuration is simplified.

[0111] <Variation 3> Figure 11 shows an example of the configuration of the peak suppression device 100M3 in the third modified embodiment. The peak suppression device 100M3 has a configuration that can handle the case when there are baseband signals of multiple frequency bands in bands 1 and 2, respectively.

[0112] Here, as an example, Band 1 contains two baseband signals x1_c0(n) and x1_c1(n), and Band 2 contains two baseband signals x2_c0(n) and x2_c1(n).

[0113] This section explains the differences in configuration between the peak suppression device 100M3 and the peak suppression device 100.

[0114] The peak suppression device 100M3 has four input terminals 101A0, 101A1, 101B0, and 101B1 instead of the input terminals 101A and 101B of the peak suppression device 100. The baseband signals x1_c0(n) and x1_c1(n) are input to input terminals 101A0 and 101A1, respectively, and the baseband signals x2_c0(n) and x2_c1(n) are input to input terminals 101B0 and 101B1, respectively.

[0115] The peak suppression device 100M3 has a configuration that adds NCO104A0, 104A1, 104B0, 104B1, adders 106A, and 106B to the peak suppression device 100.

[0116] NCO104A0 and 104A1 are connected to the output sides of input terminals 101A0 and 101A1, and the output terminals of NCO104A0 and 104A1 are connected to adder 106A. The output terminals of adder 106A are connected to NCO110A and delay unit 160A. NCO104A0 and 104A1 are examples of third frequency shift units. Adder 106A is an example of a second adder.

[0117] NCO104B0 and 104B1 are connected to the output sides of input terminals 101B0 and 101B1, and the output terminals of NCO104B0 and 104B1 are connected to adder 106B. The output terminals of adder 106B are connected to NCO110B and delay unit 160B. NCO104B0 and 104B1 are examples of fourth frequency shift units. Adder 106B is an example of a third adder.

[0118] Furthermore, the peak suppression device 100M3 has a configuration in which the amplitude calculation units 140A and 140B of the peak suppression device 100 are replaced with amplitude calculation units 140A0, 140A1, 140B0, and 140B1, and the impulse response generation units 150A and 150B of the peak suppression device 100 are replaced with impulse response generation units 150A0, 150A1, 150B0, and 150B1.

[0119] Furthermore, the peak suppression device 100M3 has a configuration in which the multipliers 155A1 and 155B1 of the peak suppression device 100 are replaced with multipliers 155A10, 155A11, 155B10, and 155B11, and an adder 156A connected to the output side of multipliers 155A10 and 155A11, and an adder 156B connected to the output side of multipliers 155B10 and 155B11 are added. The output terminal of adder 156A is connected to one input terminal of multiplier 155A2, and the output terminal of adder 156B is connected to one input terminal of multiplier 155B2.

[0120] The amplitude calculation units 140A0, 140A1, 140B0, and 140B1 calculate the amplitudes (first amplitude D1n0, first amplitude D1n1, second amplitude D2n0, second amplitude D2n1) of the baseband signals x1_c0(n), x1_c1(n), x2_c0(n), and x2_c1(n) output from NCO104A0, 104A1, 104B0, and 104B1.

[0121] The ratio calculation unit 145 calculates the ratio of the first amplitude D1n0 to the first amplitudes D1n0, D1n1, D2n0, and D2n1 (first ratio 0) and the ratio of the first amplitude D1n1 to the first amplitudes D1n0, D1n1, D2n0, and D2n1 (first ratio 1) at the timing when the peak is detected by the peak detection unit 120. That is, first ratio 0 = D1n0 / (D1n0+D1n1+D2n0+D2n1). Also, first ratio 1 = D1n1 / (D1n0+D1n1+D2n0+D2n1).

[0122] Furthermore, the ratio calculation unit 145 calculates the ratio of the second amplitude D2n0 to the first amplitudes D1n0, D1n1, D2n0, and D2n1 (second ratio 0) and the ratio of the second amplitude D2n1 to the first amplitudes D1n0, D1n1, D2n0, and D2n1 (second ratio 1) at the timing when the peak is detected by the peak detection unit 120. That is, second ratio 0 = D2n0 / (D1n0+D1n1+D2n0+D2n1). Also, second ratio 1 = D2n1 / (D1n0+D1n1+D2n0+D2n1).

[0123] The impulse response generation units 150A0 and 150A1 output the first impulse response signal 0 and the first impulse response signal 1 to the multipliers 155A10 and 155A11, respectively. The impulse response generation units 150B0 and 150B1 output the second impulse response signal 0 and the first impulse response signal 1 to the multipliers 155B10 and 155B11, respectively.

[0124] Multipliers 155A10 and 155A11 multiply the first ratio 0 and the first ratio 1 by the first impulse response signal 0 and the first impulse response signal 1, respectively, and output to adder 156A. Multipliers 155B10 and 155B11 multiply the second ratio 0 and the second ratio 1 by the second impulse response signal 0 and the first impulse response signal 1, respectively, and output to adder 156B.

[0125] Adder 156A combines the first impulse response signal 0, which is multiplied by the first ratio 0, and the first impulse response signal 1, which is multiplied by the first ratio 1, and outputs it to multiplier 155A2. Adder 156B combines the second impulse response signal 0, which is multiplied by the second ratio 0, and the second impulse response signal 1, which is multiplied by the second ratio 1, and outputs it to multiplier 155B2.

[0126] Multiplier 155A2 outputs a first peak suppression signal, obtained by multiplying the output of adder 156A by adjustment signal B1, to the negative input terminal of subtractor 170A. Multiplier 155B2 outputs a second peak suppression signal, obtained by multiplying the output of adder 156B by adjustment signal B2, to the negative input terminal of subtractor 170B.

[0127] Subtractors 170A and 170B output baseband signals xout1(n) and xout2(n), respectively.

[0128] <Flowchart> Figure 12 is a flowchart showing an example of the process performed by the peak suppression device 100M3. The process shown in Figure 12 has a modification to step S2A shown in Figure 4, and also includes steps S3A, S3B, and S3C instead of step S3.

[0129] The ratio calculation unit 145 calculates the first ratio 0, the first ratio 1, the second ratio 0, and the second ratio 1 at the timing when the peak is detected by the peak detection unit 120 (step S2A).

[0130] Multipliers 155A10, 155A11, 155B10, and 155B11 perform complex multiplication (step S3A). Multipliers 155A10 and 155A11 complex multiply the first ratio 0 and the first ratio 1 with the first impulse response signal 0 and the first impulse response signal 1, respectively, and output to adder 156A. Multipliers 155B10 and 155B11 complex multiply the second ratio 0 and the second ratio 1 with the second impulse response signal 0 and the first impulse response signal 1, respectively, and output to adder 156B.

[0131] Adders 156A and 156B perform addition (step S3B). Adder 156A combines the first impulse response signal 0, which is multiplied by the first ratio 0, and the first impulse response signal 1, which is multiplied by the first ratio 1, and outputs it to multiplier 155A2. Adder 156B combines the second impulse response signal 0, which is multiplied by the second ratio 0, and the second impulse response signal 1, which is multiplied by the second ratio 1, and outputs it to multiplier 155B2.

[0132] Multipliers 155A2 and 155B2 perform complex multiplication (step S3C). Multiplier 155A2 outputs a first peak suppression signal, obtained by multiplying the output of adder 156A by adjustment signal B1, to the negative input terminal of subtractor 170A. Multiplier 155B2 outputs a second peak suppression signal, obtained by multiplying the output of adder 156B by adjustment signal B2, to the negative input terminal of subtractor 170B.

[0133] Finally, the subtraction process in step S4 is performed, causing the subtractors 170A and 170B to output baseband signals xout1(n) and xout2(n), respectively.

[0134] As described above, when bands 1 and 2 each have baseband signals in multiple frequency bands, the peak component of the baseband signal with a large ratio (first ratio 0, first ratio 1, second ratio 0, or second ratio 1) calculated by the ratio calculation unit 145 can be primarily suppressed among the components of the baseband signals of multiple frequency bands in band 1 and the baseband signals of multiple frequency bands in band 2 included in the combined transmission signal.

[0135] <Modification 4> Figure 13 shows an example of the configuration of the peak suppression device 100M4 in the modified embodiment 4. The peak suppression device 100M4 differs from the peak suppression device 100 in that the adjustment signal generation unit 130M of the peak suppression device 100 generates a common adjustment signal for bands 1 and 2, and the impulse response generation units 150MA and 150MB output a first impulse response signal and a second impulse response signal with frequency shifted for bands 1 and 2, respectively. The peak suppression device 100M4 outputs a single baseband signal xout(n) which is a composite of bands 1 and 2.

[0136] The peak suppression device 100M4 includes an adjustment signal generation unit 130M instead of the adjustment signal generation unit 130 of the peak suppression device 100, and includes adders 157AB and 155AB instead of the multipliers 155A2 and 155B2 of the peak suppression device 100. The multipliers 155A1, 155B1 and adder 157AB are an example of a synthesis unit.

[0137] The peak suppression device 100M4 includes impulse response generation units 150MA and 150MB instead of the impulse response generation units 150A and 150B of the peak suppression device 100. Furthermore, the peak suppression device 100M4 includes one delay unit 160AB instead of the delay units 160A and 160B of the peak suppression device 100, and one subtractor 170AB instead of the subtractors 170A and 170B of the peak suppression device 100.

[0138] The delay unit 160AB is located between the adder 115 and the multiplier 170AB, and receives a combined signal from the adder 115, which is a combination of baseband signals x1(n) and x2(n). The delay unit 160AB imparts a delay time equal to the time it takes for the combined signal to reach the subtractor 170AB via the peak detection unit 120, the adjustment signal generation unit 130, and the multiplier 155AB, and outputs it to the positive input terminal of the subtractor 170AB.

[0139] Figure 14 shows an example of the first and second impulse response signals output by the impulse response generation units 150MA and 150MB, with the frequencies shifted for bands 1 and 2. In Figure 14, the first and second impulse response signals output by the impulse response generation units 150A and 150B of the peak suppression device 100 are shown as dashed lines, and the first and second impulse response signals output by the impulse response generation units 150MA and 150MB are shown as solid lines.

[0140] As shown in Figure 14, the impulse response generation unit 150MA outputs a first impulse response signal with a frequency lowered by Δf1 compared to the first impulse response signal output by the impulse response generation unit 150A of the peak suppression device 100. The impulse response generation unit 150MB outputs a second impulse response signal with a frequency higher than the second impulse response signal output by the impulse response generation unit 150B of the peak suppression device 100, by Δf2. The sum of Δf1 and Δf2 is the frequency difference between bands 1 and 2.

[0141] In the peak suppression device 100M4, when the peak detection unit 120 detects a peak in the composite signal, the adjustment signal generation unit 130M outputs an adjustment signal that reflects the amplitude A and phase θ of the peak. The amplitude of the adjustment signal is the value obtained by subtracting the threshold th from the amplitude A of the peak of the composite signal (A-th). The phase of the adjustment signal is the phase θ of the peak of the composite signal.

[0142] Multipliers 155A1 and 155B1 multiply the first and second impulse response signals by the first and second ratios, respectively. The first impulse response signal, multiplied by the first ratio, and the second impulse response signal, multiplied by the second ratio, are then combined in adder 157AB. The combined impulse response signal generated in adder 157AB is then multiplied by the adjustment signal in multiplier 155AB to generate a peak suppression signal.

[0143] In the subtractor 170AB, the peak suppression signal is subtracted from the composite signal delayed by the delay unit 160AB, and the result is output as the baseband signal xout(n).

[0144] Therefore, among the baseband signals xout1(n) and xout2(n) components included in the combined transmission signal synthesized by the adder 23 (see Figure 1), the peak component with the larger ratio (first ratio or second ratio) calculated by the ratio calculation unit 145 can be primarily suppressed.

[0145] Furthermore, it can output a baseband signal xout(n) obtained by subtracting a peak suppression signal, which is generated by complex multiplying the synthesized impulse response signal and the adjustment signal, from the synthesized signal.

[0146] Furthermore, when using the peak suppression device 100M4, the digital section 20 does not need to include the frequency shift sections 22A and 22B and the adder 23, and only needs to output the baseband signal xout(n) to the DAC 30.

[0147] <Modification 5> Figure 15 shows an example of the configuration of the peak suppression device 100M5 in the modified embodiment 5. The peak suppression device 100M5 is a modified version of the peak suppression device 100, which receives two baseband signals x1(n) and x2(n), but which receives three baseband signals x1(n), x2(n), and x3(n).

[0148] The peak suppression device 100M5 has a configuration that adds an input terminal 101C, an output terminal 102C, an NCO 110C, an amplitude calculation unit 140C, an impulse response generation unit 150C, multipliers 155C1 and 155C2, and a subtractor 170C to the peak suppression device 100.

[0149] A baseband signal x3(n) is input to input terminal 101C. The frequencies of the baseband signals x1(n), x2(n), and x3(n) input to input terminals 101A to 101C are equal, for example, but they may be different.

[0150] In the peak suppression device 100M5, NCO110A~110C shifts the frequencies of the baseband signals x1(n), x2(n), and x3(n) for bands 1, 2, and 3, respectively.

[0151] The adder 115 outputs a combined signal to the peak detection unit 120, which is obtained by combining the baseband signals x1(n), x2(n), and x3(n), whose frequencies have been shifted by NCO110A~110C.

[0152] The adjustment signal generation unit 130 receives the phase φ3 of the baseband signal x3(n) and the phase θ3 of the baseband signal x3(n) whose frequency has been shifted by the NCO110C. The adjustment signal generation unit 130 generates adjustment signals B1 to B3 and outputs them to the multipliers 155A2 to 155C2, respectively.

[0153] The amplitude calculation unit 140C calculates the third amplitude D3n of the baseband signal x3(n) input from the input terminal 101C and outputs it to the ratio calculation unit 145.

[0154] The ratio calculation unit 145 calculates, at the timing when the peak detection unit 120 detects a peak, the first ratio of the first amplitude D1n to the first amplitude D1n, the second amplitude D2n, and the third amplitude D3n {{D1n / (D1n+D2n+D3n)}}, the second ratio of the second amplitude D2n to the first amplitude D1n, the second amplitude D2n, and the third amplitude D3n {D2n / (D1n+D2n+D3n)}, and the third ratio of the third amplitude D3n to the first amplitude D1n, the second amplitude D2n, and the third amplitude D3n {D3n / (D1n+D2n+D3n)}.

[0155] When the peak timing notification signal is input from the peak detection unit 120, the impulse response generation unit 150C outputs a third impulse response signal to the multiplier 155C1, similar to how the impulse response generation units 150A and 150B output the first impulse response signal and the second impulse response signal to the multipliers 155A1 and 155B1, respectively.

[0156] Multiplier 155C1 multiplies the third impulse response signal by the third ratio and outputs it to multiplier 155C2. Multiplier 155C2 multiplies the third impulse response signal, which has been multiplied by the third ratio, by the adjustment signal B3 to generate a third peak suppression signal, which is output to the negative input terminal of subtractor 170C.

[0157] The subtractor 170C subtracts the third peak suppression signal from the baseband signal x3(n) delayed by the delay unit 160C, and outputs the baseband signal xout3(n).

[0158] As described above, the peak suppression device 100M5, which has a configuration in which three baseband signals x1(n), x2(n), and x3(n) are input, can operate in the same way as the peak suppression device 100, which has a configuration in which two baseband signals x1(n) and x2(n) are input. Furthermore, the peak suppression device 100M5 can operate in the same way even if it is changed to a configuration in which four or more baseband signals are input.

[0159] According to Modification 5, a peak suppression device 100M5 capable of suppressing the peaks of a multiband combined signal can be provided.

[0160] <Effects> The peak suppression device 100 (information processing device) of the embodiment of this disclosure is A peak detection unit 120 detects the peak of a signal based on a multiband signal obtained by combining a first baseband signal and a second baseband signal, A ratio adjustment unit (140A, 140B, 145, 150A, 150B, 155A1, 155A2, 155B1, 155B2) adjusts the ratio of the first peak suppression signal corresponding to the first baseband signal and the second peak suppression signal corresponding to the second baseband signal according to the amplitude or power of the first baseband signal and the second baseband signal at the timing when a peak is detected, A peak suppression section (170A, 170B) that suppresses the peaks of a multiband signal using a first peak suppression signal and a second peak suppression signal with adjusted ratios, The output section outputs a multiband signal with suppressed peaks. Includes.

[0161] Therefore, among the baseband signals xout1(n) and xout2(n) components included in the combined transmission signal synthesized by the adder 23 (see Figure 1), the peak component with the larger ratio (first ratio or second ratio) calculated by the ratio calculation unit 145 can be primarily suppressed.

[0162] Therefore, a peak suppression device 100 (information processing device) capable of suppressing the peaks of a multiband combined signal can be provided. In addition, the peaks of the transmitted signal can be reduced, enabling lower power consumption of the transmitting amplifier (PA43). Furthermore, by adjusting the gain of the impulse response for each band using the first and second ratios calculated by the ratio calculation unit 145 based on the instantaneous amplitude of each band, the reduction amount of PAPR can be improved while satisfying the signal quality (EVM) specified by 3GPP (registered trademark, Third Generation Partnership Project).

[0163] Furthermore, the peak-suppressed multiband signal may be a signal obtained by combining a first-frequency signal corresponding to the first baseband signal and a second-frequency signal corresponding to the second baseband signal.

[0164] Of the baseband signals xout1(n) and xout2(n) of the signal obtained by combining a signal of a first frequency corresponding to the first baseband signal and a signal of a second frequency corresponding to the second baseband signal, the peak component of the component with the larger ratio (first ratio or second ratio) calculated by the ratio calculation unit 145 can be primarily suppressed.

[0165] The system may also include peak suppression signal generation units (155A1, 155A2, 155B1, 155B2) that generate peak suppression signals corresponding to the peaks of the multiband signal.

[0166] In the peak suppression signal generation units (155A1, 155A2, 155B1, 155B2), the peak component with the larger ratio (first ratio or second ratio) calculated by the ratio calculation unit 145 can be primarily suppressed.

[0167] Furthermore, there is a first frequency shifting unit (110A) that shifts the frequency of the first baseband signal to the frequency for the first band, A second frequency shift section (110B) shifts the frequency of the second baseband signal to the frequency for the second band, A first adder (115) generates a composite signal by adding the output of the first frequency shift unit (110A) and the output of the second frequency shift unit (110B). It further includes, A signal based on a multiband signal is a composite signal. The peak detection unit 120 may detect the peak of the amplitude of the composite signal.

[0168] By detecting the peak of the composite signal obtained by adding the output of the first frequency shift unit (110A), which shifts the frequency of the first baseband signal to the frequency for the first band, and the output of the second frequency shift unit (110B), which shifts the frequency of the second baseband signal to the frequency for the second band, the peak component of the larger ratio (first ratio or second ratio) calculated by the ratio calculation unit 145 can be primarily suppressed.

[0169] The ratio adjustment units (140A, 140B, 145, 150A, 150B, 155A1, 155A2, 155B1, 155B2) are, A first impulse response generation unit (150A) generates a first impulse response signal corresponding to a first frequency signal at the timing when a peak is detected by the peak detection unit 120, A second impulse response generation unit (150B) generates a second impulse response signal corresponding to a second frequency signal at the timing when a peak is detected by the peak detection unit 120, A first amplitude determination unit (140A) that determines the first amplitude of a signal of a first frequency, A second amplitude determination unit (140B) that determines the second amplitude of a signal of the second frequency, At the timing when the peak of the multiband signal is detected by the peak detection unit 120, a ratio determination unit (145) determines a first ratio of the first amplitude to the first and second amplitudes, and a second ratio of the second amplitude to the first and second amplitudes. An adjustment signal generation unit (130) generates an adjustment signal that adjusts the amplitude and phase of the first impulse response signal and the amplitude and phase of the second impulse response signal according to the phase θ of the multiband signal, the phase θ1 of the first frequency signal, the phase θ2 of the second frequency signal, the phase φ1 of the first baseband signal, the phase φ2 of the second baseband signal, and the amplitude value of the peak of the multiband signal at the timing when the peak is detected by the peak detection unit 120. A first multiplication unit (155A1, 155A2) generates a first peak suppression signal by complex multiplying the first impulse response signal, the first ratio, and the adjustment signal, A second multiplier unit (155B1, 155B2) generates a second peak suppression signal by complex multiplying the second impulse response signal, the second ratio, and the adjustment signal, It may have.

[0170] By using a ratio adjustment unit with this configuration, it is possible to detect the peak of the composite signal obtained by adding the output of the first frequency shift unit (110A), which shifts the frequency of the first baseband signal to the frequency for the first band, and the output of the second frequency shift unit (110B), which shifts the frequency of the second baseband signal to the frequency for the second band. This allows for the suppression of the peak component with the larger ratio (first ratio or second ratio) calculated by the ratio calculation unit 145.

[0171] Furthermore, the peak suppression section (170A, 170B) A first subtraction unit (170A) subtracts a first peak suppression signal from a first frequency signal, A second subtraction unit (170B) subtracts a second peak suppression signal from a second frequency signal, It may have.

[0172] By subtracting the first peak suppression signal and the second peak suppression signal from the first frequency signal and the second frequency signal, respectively, the peak component with the larger ratio (first ratio or second ratio) calculated by the ratio calculation unit 145 can be primarily suppressed.

[0173] Furthermore, the adjustment signal generation unit (130) generates a first adjustment signal and a second adjustment signal as adjustment signals, which adjust the amplitude and phase of the first impulse response signal and the second impulse response signal, respectively, according to the phase θ of the multiband signal, the phase θ1 of the first frequency signal, the phase θ2 of the second frequency signal, the phase φ1 of the first baseband signal, the phase φ2 of the second baseband signal, and the amplitude value of the peak of the multiband signal, at the timing when the peak is detected by the peak detection unit 120. The first multiplication unit (155A1, 155A2) generates a first peak suppression signal by complex multiplying the first impulse response signal, the first ratio, and the first adjustment signal. The second multiplier (155B1, 155B2) may generate a second peak suppression signal by complex multiplying the second impulse response signal, the second ratio, and the second adjustment signal.

[0174] Therefore, by adjusting the amplitude and phase of the first and second impulse response signals using adjustment signals B1 and B2, respectively, the peak component of the baseband signals xout1(n) and xout2(n) included in the combined transmission signal that has a larger ratio calculated by the ratio calculation unit 145 can be suppressed more effectively. In addition, the peak of the transmission signal can be reduced more effectively, and the power of the transmission amplifier (PA43) can be reduced.

[0175] Furthermore, the adjustment signal generation unit (130) may generate a first adjustment signal having an amplitude obtained by subtracting a threshold from the peak amplitude value and a phase (θ-θ1+φ1) obtained by subtracting the difference between phase θ1 and phase φ1 from phase θ, and a second adjustment signal having an amplitude obtained by subtracting a threshold from the peak amplitude value and a phase (θ-θ2+φ2) obtained by subtracting the difference between phase θ2 and phase φ2 from phase θ.

[0176] The amplitude and phase of the first and second impulse response signals can be adjusted using adjustment signal B1, which has amplitude (A-th) and phase (θ-θ1+φ1), and adjustment signal B2, which has amplitude (A-th) and phase (θ-θ2+φ2). Therefore, depending on the excess portion of the peak amplitude value A that exceeds the threshold th, and the phases (θ-θ1+φ1) and (θ-θ2+φ2), the peak component of the baseband signals xout1(n) and xout2(n) included in the combined transmission signal that has a larger ratio calculated by the ratio calculation unit 145 can be suppressed more accurately and proactively. In addition, the peak of the transmission signal can be reduced more accurately, and the power of the transmission amplifier (PA43) can be reduced.

[0177] Furthermore, the system may also include a ratio output control unit (146) provided between the ratio determination unit (145) and the first multiplication units (155A1, 155A2), and between the ratio determination unit (145) and the second multiplication units (155B1, 155B2), which outputs the first ratio and the second ratio to the corresponding first multiplication unit (155A1, 155A2) and second multiplication unit (155B1, 155B2) respectively when the first ratio or the second ratio is equal to or greater than the third ratio, and sets the first ratio and the second ratio to the fourth ratio and outputs them to the corresponding first multiplication unit (155A1, 155A2) and second multiplication unit (155B1, 155B2) when the first ratio and the second ratio are less than the third ratio.

[0178] When the first ratio {D1n / (D1n+D2n)} and the second ratio {D2n / (D1n+D2n)} are less than a predetermined ratio B, peak suppression is not performed, allowing the ratio calculation unit 145 to efficiently and effectively suppress the peak component with the larger ratio. This also allows for a further reduction in the peak of the transmitted signal, enabling the transmission amplifier (PA43) to be powered more efficiently.

[0179] Furthermore, the ratio determination unit (145) A storage unit (145R) stores data relating the first amplitude and second amplitude to a first ratio of the first amplitude, and outputs the first ratio in the data corresponding to the first amplitude and second amplitude at the timing when the peak is detected by the peak detection unit 120. A subtraction unit (145S) determines the second ratio by subtracting the first ratio output from the storage unit (145R) from 1. It may have.

[0180] Even in a configuration where the ratio calculation unit 145 has a RAM 145R that stores ratio data and a subtractor 145S, a peak suppression device 100 (information processing device) capable of peak suppression can be provided even if the IBW of the multiband combined signal is large. Furthermore, since the ratio calculation unit 145 can be implemented with RAM 145R and subtractor 145S, the configuration is simplified.

[0181] Furthermore, there are multiple third frequency shifting units that shift the frequency of the first baseband signal to frequencies for multiple frequency bands of the first band, Multiple fourth frequency shift units that shift the frequency of the second baseband signal to frequencies for multiple frequency bands of the second band, A first adder that adds up multiple outputs of multiple third frequency shift sections and outputs them to a first frequency shift section (110A), A second adder that adds up the multiple outputs of multiple fourth frequency shift sections and outputs them to the second frequency shift section (110B), It further includes, Multiple first amplitude determination units (140A) are provided to correspond to multiple frequency bands of the first band, and determine multiple first amplitudes of signals in multiple frequency bands of the first baseband signal. The second amplitude determination unit (140B) is provided in multiple units corresponding to multiple frequency bands of the second band, and determines multiple second amplitudes of signals in multiple frequency bands of the second baseband signal. The ratio determination unit (145), at the timing when a peak is detected by the peak detection unit 120, determines a plurality of first ratios of the plurality of first amplitudes to a plurality of first amplitudes and a plurality of second amplitudes, and a second ratio of the plurality of second amplitudes to a plurality of first amplitudes and a plurality of second amplitudes. The first impulse response generation unit (150A) is provided in multiple units corresponding to multiple frequency bands of the first band. The second impulse response generation unit (150B) is provided in multiple units corresponding to multiple frequency bands of the second band. The first multiplier (155A1, 155A2) generates a first peak suppression signal by complex multiplying multiple first impulse response signals generated by multiple first impulse response generation units (150A), multiple first ratios, and an adjustment signal. The second multiplier (155B1, 155B2) may generate a second peak suppression signal by complex multiplying a plurality of second impulse response signals generated by a plurality of first impulse response generation units (150A), a plurality of second ratios, and an adjustment signal.

[0182] When the first band and the second band each have baseband signals in multiple frequency bands, even if the IBW of the multiband composite signal is large, the peak component of the baseband signal with a large ratio (first ratio 0, first ratio 1, second ratio 0, or second ratio 1) calculated by the ratio calculation unit 145 can be primarily suppressed among the components of the baseband signals of multiple frequency bands in the first band and the baseband signals of multiple frequency bands in the second band included in the composite transmission signal.

[0183] Therefore, even if the IBW of the multiband combined signal is large and the first and second bands each have baseband signals of multiple frequency bands, a peak suppression device 100 (information processing device) capable of peak suppression can be provided. In addition, the peak of the transmitted signal can be reduced, making it possible to reduce the power consumption of the transmitting amplifier (PA43).

[0184] Furthermore, the ratio adjustment units (140A, 140B, 145, 150A, 150B, 155A1, 155A2, 155B1, 155B2) are, A first impulse response generation unit (150A) generates a first impulse response signal corresponding to a first frequency signal at the timing when a peak is detected by the peak detection unit 120, A second impulse response generation unit (150B) generates a second impulse response signal corresponding to a second frequency signal at the timing when a peak is detected by the peak detection unit 120, A first amplitude determination unit (140A) that determines the first amplitude of a signal of a first frequency, A second amplitude determination unit (140B) that determines the second amplitude of a signal of the second frequency, At the timing when the peak of the multiband signal is detected by the peak detection unit 120, a ratio determination unit (145) determines a first ratio of the first amplitude to the first and second amplitudes, and a second ratio of the second amplitude to the first and second amplitudes. An adjustment signal generation unit (130) generates an adjustment signal that adjusts the amplitude and phase of the first impulse response signal and the amplitude and phase of the second impulse response signal according to the phase θ of the multiband signal and the amplitude value of the peak of the multiband signal at the timing when the peak is detected by the peak detection unit 120, A synthesis unit generates a composite impulse response signal by combining a first ratio-multiplied impulse response signal obtained by multiplying a first impulse response signal by a first ratio, and a second ratio-multiplied impulse response signal obtained by multiplying a second impulse response signal by a second ratio. A multiplier unit (155AB) generates a peak suppression signal by complex multiplying the synthesized impulse response signal and the adjustment signal, A subtraction unit (170AB) subtracts the peak suppression signal from the combined signal. It may have.

[0185] Therefore, even if the IBW of the multiband combined signal is large, the peak component of the baseband signals xout1(n) and xout2(n) included in the combined transmission signal combined by the adder 23 (see Figure 1) can be primarily suppressed, whichever has a larger ratio (first ratio or second ratio) calculated by the ratio calculation unit 145.

[0186] Therefore, even if the IBW of the multiband combined signal is large, a peak suppression device 100 (information processing device) capable of peak suppression can be provided. Furthermore, a baseband signal xout(n) can be output by subtracting the peak suppression signal, which is generated by complex multiplying the combined impulse response signal and the adjustment signal, from the combined signal. In addition, the peak of the transmitted signal can be reduced, making it possible to reduce the power of the transmitting amplifier (PA43). Moreover, by adjusting the gain of the impulse response for each band using the first ratio and second ratio calculated by the ratio calculation unit 145 based on the instantaneous amplitude of each band, the amount of PAPR reduction can be improved while satisfying the signal quality (EVM) specified by 3GPP (Third Generation Partnership Project).

[0187] The RU10 (communication device) in the embodiment of this disclosure is A transmit signal generation unit (21) that generates a first baseband signal for the first band and a second baseband signal for the second band, An information processing device (100) to which a first baseband signal and a second baseband signal are input, A combining unit (23) generates a multiband signal by combining a first baseband signal and a second baseband signal that have been peak-suppressed by an information processing device (100), A transmitting circuit (40) performs upconversion and amplification processing on a multiband signal. A communication device (10) including, The information processing device (100) is A peak detection unit 120 detects the peak of a signal based on a multiband signal obtained by combining a first baseband signal and a second baseband signal, A ratio adjustment unit (140A, 140B, 145, 150A, 150B, 155A1, 155A2, 155B1, 155B2) adjusts the ratio of the first peak suppression signal corresponding to the first baseband signal and the second peak suppression signal corresponding to the second baseband signal according to the amplitude or power of the first baseband signal and the second baseband signal at the timing when a peak is detected, A peak suppression section (170A, 170B) that suppresses the peaks of a multiband signal using a first peak suppression signal and a second peak suppression signal with adjusted ratios, The output section outputs a multiband signal with suppressed peaks. It holds.

[0188] Therefore, among the baseband signals xout1(n) and xout2(n) components included in the combined transmission signal synthesized by the adder 23 (see Figure 1), the peak component with the larger ratio (first ratio or second ratio) calculated by the ratio calculation unit 145 can be primarily suppressed.

[0189] Therefore, it is possible to provide an RU10 (communication device) capable of peak suppression of multiband combined signals. In addition, the peak of the transmitted signal can be reduced, enabling lower power consumption of the transmitting amplifier (PA43). Furthermore, by adjusting the gain of the impulse response for each band using the first and second ratios calculated by the ratio calculation unit 145 based on the instantaneous amplitude of each band, it is possible to improve the reduction amount of PAPR while satisfying the signal quality (EVM) specified by 3GPP (Third Generation Partnership Project).

[0190] The peak suppression method (information processing method) of the embodiments of this disclosure is, The first input terminal (101A) receives the first baseband signal, The second input terminal (101B) receives the second baseband signal, An information processing method performed by an information processing device (100) including, The detection of signal peaks based on a multiband signal obtained by combining the first baseband signal and the second baseband signal, The ratio of the first peak suppression signal corresponding to the first baseband signal and the second peak suppression signal corresponding to the second baseband signal is adjusted according to the amplitude or power of the first and second baseband signals at the timing when a peak is detected. The peaks of the multiband signal are suppressed using a first peak suppression signal and a second peak suppression signal with adjusted ratios. Outputting a multiband signal with suppressed peaks Includes.

[0191] Therefore, among the baseband signals xout1(n) and xout2(n) components included in the combined transmission signal synthesized by the adder 23 (see Figure 1), the peak component with the larger ratio (first ratio or second ratio) calculated by the ratio calculation unit 145 can be primarily suppressed.

[0192] Therefore, a peak suppression method (information processing method) capable of suppressing the peaks of a multiband combined signal can be provided. In addition, the peaks of the transmitted signal can be reduced, enabling lower power consumption of the transmitting amplifier (PA43). Furthermore, by adjusting the gain of the impulse response for each band using the first and second ratios calculated by the ratio calculation unit 145 based on the instantaneous amplitude of each band, the reduction amount of PAPR can be improved while satisfying the signal quality (EVM) specified by 3GPP (Third Generation Partnership Project).

[0193] Although exemplary embodiments of the information processing apparatus, communication apparatus, and information processing method of this disclosure have been described above, this disclosure is not limited to the specifically disclosed embodiments, and various modifications and changes are possible without departing from the scope of the claims. [Explanation of symbols]

[0194] 1 Antenna 10 RU 20 Digital Department 21 Transmission signal generation unit 22A, 22B Frequency Shift Section 23 Adder 30 DAC 40 Analog Section 41 Multiplier 42 Oscillators 43 PA 44 BPF 100, 100M1~100M5 Peak Suppression Device 101A, 101B input terminals 102A, 102B output terminals 110A, 110B NCO 115 Adder 120 Peak detection unit 130, 130M adjustment signal generation section 140A, 140A0, 140A1, 140B, 140B0, 140B1, 140C Amplitude calculation section 145, 145M ratio calculation section 150A, 150A0, 150A1, 150MA, 150B, 150B0, 150B1, 150MB, 150C Impulse Response Generation Unit Multipliers 155A1, 155A2, 155B1, 155B2, 155AB Delay section 160A, 160B, 160AB 170A, 170B, 170AB Subtractors

Claims

1. A peak detection unit that detects the peak of a signal based on a multiband signal obtained by combining a first baseband signal and a second baseband signal, A ratio adjustment unit adjusts the ratio of a first peak suppression signal corresponding to the first baseband signal and a second peak suppression signal corresponding to the second baseband signal according to the amplitude or power of the first baseband signal and the second baseband signal at the timing when the peak is detected. A peak suppression unit that suppresses the peaks of the multiband signal using the first peak suppression signal and the second peak suppression signal, whose ratios have been adjusted, An output unit that outputs the multiband signal with the aforementioned peaks suppressed. Information processing device, including

2. The information processing apparatus according to claim 1, wherein the multiband signal from which the peak has been suppressed is a signal obtained by combining a signal of a first frequency corresponding to the first baseband signal and a signal of a second frequency corresponding to the second baseband signal.

3. The information processing apparatus according to claim 1, further comprising a peak suppression signal generation unit that generates a peak suppression signal corresponding to the peak of the multiband signal.

4. A first frequency shift unit that shifts the frequency of the first baseband signal to a frequency for the first band, A second frequency shift unit that shifts the frequency of the second baseband signal to the frequency for the second band, A first adder that generates a composite signal by adding the output of the first frequency shift unit and the output of the second frequency shift unit. It further includes, The signal based on the multiband signal is the composite signal, The information processing apparatus according to claim 2, wherein the peak detection unit detects the peak of the amplitude of the composite signal.

5. The ratio adjustment unit is, A first impulse response generation unit generates a first impulse response signal corresponding to the first frequency signal at the timing when the peak is detected by the peak detection unit, A second impulse response generation unit generates a second impulse response signal corresponding to the second frequency signal at the timing when the peak is detected by the peak detection unit, A first amplitude determination unit for determining the first amplitude of the signal of the first frequency, A second amplitude determination unit for determining the second amplitude of the signal of the second frequency, At the timing when the peak of the multiband signal is detected by the peak detection unit, a ratio determination unit determines a first ratio of the first amplitude to the first and second amplitudes, and a second ratio of the second amplitude to the first and second amplitudes. An adjustment signal generation unit generates an adjustment signal that adjusts the amplitude and phase of the first impulse response signal and the amplitude and phase of the second impulse response signal according to the phase θ of the multiband signal, the phase θ1 of the first frequency signal, the phase θ2 of the second frequency signal, the phase φ1 of the first baseband signal, the phase φ2 of the second baseband signal, and the amplitude value of the peak of the multiband signal at the timing when the peak is detected by the peak detection unit. A first multiplier unit generates the first peak suppression signal by complex multiplying the first impulse response signal, the first ratio, and the adjustment signal, A second multiplier unit generates the second peak suppression signal by complex multiplying the second impulse response signal, the second ratio, and the adjustment signal, The information processing apparatus according to claim 4, having the following features.

6. The aforementioned peak suppression unit A first subtraction unit that subtracts the first peak suppression signal from the first frequency signal, A second subtraction unit that subtracts the second peak suppression signal from the second frequency signal, The information processing apparatus according to claim 5, having the following features.

7. The adjustment signal generation unit generates a first adjustment signal and a second adjustment signal as the adjustment signals, which adjust the amplitude and phase of the first impulse response signal and the second impulse response signal, respectively, according to the phase θ of the multiband signal, the phase θ1 of the first frequency signal, the phase θ2 of the second frequency signal, the phase φ1 of the first baseband signal, the phase φ2 of the second baseband signal, and the amplitude value of the peak of the multiband signal, at the timing when the peak is detected by the peak detection unit. The first multiplier generates the first peak suppression signal by complex multiplying the first impulse response signal, the first ratio, and the first adjustment signal. The information processing apparatus according to claim 5, wherein the second multiplication unit generates the second peak suppression signal by complex multiplication of the second impulse response signal, the second ratio, and the second adjustment signal.

8. The information processing apparatus according to claim 7, wherein the adjustment signal generation unit generates a first adjustment signal having an amplitude obtained by subtracting a threshold from the amplitude value of the peak and a phase (θ - θ1 + φ1) obtained by subtracting the difference between the phase θ1 and the phase φ1 from the phase θ, and a second adjustment signal having an amplitude obtained by subtracting the threshold from the amplitude value of the peak and a phase (θ - θ2 + φ2) obtained by subtracting the difference between the phase θ2 and the phase φ2 from the phase θ.

9. The information processing apparatus according to claim 5, further comprising a ratio output control unit provided between the ratio determination unit and the first multiplication unit and between the ratio determination unit and the second multiplication unit, which outputs the first ratio and the second ratio to the corresponding first multiplication unit and second multiplication unit, respectively, when the first ratio or the second ratio is the third ratio or greater, and sets the first ratio and the second ratio to the fourth ratio and outputs it to the corresponding first multiplication unit and second multiplication unit, when the first ratio and the second ratio are less than the third ratio.

10. The ratio determination unit, A storage unit stores data relating the first amplitude and the second amplitude to a first ratio of the first amplitude, and outputs the first ratio in the data corresponding to the first amplitude and the second amplitude at the timing when the peak is detected by the peak detection unit. A subtraction unit that determines the second ratio by subtracting the first ratio output from the storage unit from 1. The information processing apparatus according to claim 5, having the following features.

11. A plurality of third frequency shift units that shift the frequency of the first baseband signal to frequencies for multiple frequency bands of the first band, A plurality of fourth frequency shift units that shift the frequency of the second baseband signal to frequencies for multiple frequency bands of the second band, A first adder that adds up the multiple outputs of the multiple third frequency shift units and outputs the result to the first frequency shift unit, A second adder that adds up the multiple outputs of the multiple fourth frequency shift units and outputs the result to the second frequency shift unit, It further includes, The first amplitude determination unit is provided in multiple units corresponding to the multiple frequency bands of the first band, and determines multiple first amplitudes of signals in the multiple frequency bands of the first baseband signal. The second amplitude determination unit is provided in multiple units corresponding to the multiple frequency bands of the second band, and determines the multiple second amplitudes of the signals in the multiple frequency bands of the second baseband signal. The ratio determination unit determines, at the timing when the peak is detected by the peak detection unit, a plurality of first ratios of the plurality of first amplitudes to the plurality of first amplitudes and the plurality of second amplitudes, and a second ratio of the plurality of second amplitudes to the plurality of first amplitudes and the plurality of second amplitudes. The first impulse response generation unit is provided in multiple units corresponding to the multiple frequency bands of the first band, The second impulse response generation unit is provided in multiple units corresponding to the multiple frequency bands of the second band, The first multiplier generates a first peak suppression signal by complex multiplying the plurality of first impulse response signals generated by the plurality of first impulse response generation units, the plurality of first ratios, and the adjustment signal. The information processing apparatus according to claim 5, wherein the second multiplication unit generates a second peak suppression signal by complex multiplying a plurality of second impulse response signals generated by the plurality of first impulse response generation units, a plurality of second ratios, and the adjustment signal.

12. The ratio adjustment unit is, A first impulse response generation unit generates a first impulse response signal corresponding to a first frequency signal at the timing when the peak is detected by the peak detection unit, A second impulse response generation unit generates a second impulse response signal corresponding to a second frequency signal at the timing when the peak is detected by the peak detection unit, A first amplitude determination unit for determining the first amplitude of the signal of the first frequency, A second amplitude determination unit for determining the second amplitude of the signal of the second frequency, At the timing when the peak of the multiband signal is detected by the peak detection unit, a ratio determination unit determines a first ratio of the first amplitude to the first and second amplitudes, and a second ratio of the second amplitude to the first and second amplitudes. An adjustment signal generation unit generates an adjustment signal that adjusts the amplitude and phase of the first impulse response signal and the amplitude and phase of the second impulse response signal according to the phase θ of the multiband signal and the amplitude value of the peak of the multiband signal at the timing when the peak is detected by the peak detection unit, A synthesis unit generates a composite impulse response signal by combining a first ratio-multiplied impulse response signal obtained by multiplying the first impulse response signal by the first ratio, and a second ratio-multiplied impulse response signal obtained by multiplying the second impulse response signal by the second ratio. A multiplication unit generates a peak suppression signal by complex multiplying the composite impulse response signal and the adjustment signal. A subtraction unit that subtracts the peak suppression signal from the composite signal. The information processing apparatus according to claim 4, having the following features.

13. A transmission signal generation unit that generates a first baseband signal for the first band and a second baseband signal for the second band, An information processing device to which the first baseband signal and the second baseband signal are input, The information processing device includes a combining unit that generates a multiband signal by combining the first baseband signal and the second baseband signal, which have been peak-suppressed, A transmitting circuit performs upconversion and amplification processing on the multiband signal. A communication device including, The aforementioned information processing device is A peak detection unit that detects the peak of a signal based on a multiband signal obtained by combining a first baseband signal and a second baseband signal, A ratio adjustment unit adjusts the ratio of a first peak suppression signal corresponding to the first baseband signal and a second peak suppression signal corresponding to the second baseband signal according to the amplitude or power of the first baseband signal and the second baseband signal at the timing when the peak is detected. A peak suppression unit that suppresses the peaks of the multiband signal using the first peak suppression signal and the second peak suppression signal, whose ratios have been adjusted, An output unit that outputs the multiband signal with the aforementioned peaks suppressed. A communication device having the following features.

14. A first input terminal into which the first baseband signal is input, The second input terminal receives the second baseband signal, An information processing method performed by an information processing device including, The detection of signal peaks based on a multiband signal obtained by combining the first baseband signal and the second baseband signal, The ratio of the first peak suppression signal corresponding to the first baseband signal and the second peak suppression signal corresponding to the second baseband signal is adjusted according to the amplitude or power of the first baseband signal and the second baseband signal at the timing when the peak is detected. The peaks of the multiband signal are suppressed using the first and second peak suppression signals, whose ratios have been adjusted. Outputting the multiband signal with the aforementioned peak suppressed. Information processing methods, including those mentioned above.

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