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Method and device for restraining peak-to-average power ratio

A peak-to-average ratio and average power technology, applied in the field of digital communication, can solve the problems of suppressing peak-to-average ratio, out-of-band radiation, signal in-band distortion, etc., to reduce in-band distortion and out-of-band radiation, and improve performance.

Active Publication Date: 2013-12-04
COMBA TELECOM SYST CHINA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this traditional limiting method uses a fixed limiting threshold, and the input signal is constantly changing in different time periods, and the limiting threshold will not change with the change of the input signal. Adaptively adjust, thereby affecting the effect of suppressing the peak-to-average ratio
Moreover, this simple limiting method will cause in-band distortion and out-of-band radiation of the signal, resulting in a large bit error rate

Method used

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  • Method and device for restraining peak-to-average power ratio
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  • Method and device for restraining peak-to-average power ratio

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Experimental program
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Embodiment 1

[0089] Figure 4 A schematic structural diagram of Embodiment 1 of the device for suppressing the peak-to-average ratio of the present invention is shown in .

[0090] Such as Figure 4As shown, the device for suppressing the peak-to-average ratio in this embodiment includes: a frequency-domain upsampling unit 201, a first IFFT unit 202, a time-domain limiting unit 203, an FFT unit 204, an out-of-band adjustment unit 205, and an in-band adjustment unit Unit 206, the second IFFT unit 207, the peak clipping ratio adjustment unit 209, the clipping threshold update unit 210, and the buffer unit 208, wherein the input terminals of the frequency domain upsampling unit 201 and the buffer unit 208 are connected to the original frequency domain signal, and the frequency domain The output end of the domain up-sampling unit 201 is connected to the input end of the first IFFT unit 202, and the output end of the first IFFT unit 202 is connected to an input end of the time domain limiting ...

Embodiment 2

[0139] Figure 5 A schematic structural diagram of Embodiment 2 of the device for suppressing the peak-to-average ratio of the present invention is shown in .

[0140] Such as Figure 5 As shown, the difference between the solution in the second embodiment and the solution in the first embodiment mainly lies in that in this embodiment: the input end of the clipping threshold update unit 210 is not connected to the output end of the first IFFT unit, but is connected to the output end of the frequency domain up-sampling unit 201, and the clipping threshold updating unit 210 calculates the time-domain clipping threshold according to the up-sampled frequency domain signal.

[0141] This is because the average power P x , is substantially consistent with the average power of the upsampled frequency domain data before FFT transformation, therefore, the average power P of the upsampled time domain data can also be obtained according to the average power of the upsampled frequency d...

Embodiment 3

[0144] Figure 6 The schematic diagram of the third embodiment of the device for suppressing the peak-to-average ratio of the present invention is shown in .

[0145] Such as Figure 6 As shown, the difference between the solution in the third embodiment and the solution in the first embodiment mainly lies in that in this embodiment: the input end of the clipping threshold updating unit 210 is not connected to the output end of the first IFFT unit, but It directly accesses the original input data, and the clipping threshold update unit 210 calculates the time-domain clipping threshold according to the original input data.

[0146] This is because the average power of the original input data before frequency domain upsampling and the average power of the frequency domain data after frequency domain upsampling are in multiples based on the multiple of upsampling, that is, after obtaining the average power of the original input data In the case of , combined with the multiple o...

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Abstract

Provided are a method and device for restraining a peak-to-average power ratio. The method comprises the steps of performing upsampling and inverse fast Fourier transform (IFFT) on in-band data of an original frequency domain to obtain time domain data after upsampling; performing amplitude limiting treatment and fast Fourier transform (FFT) on the time domain data after upsampling according to a time domain amplitude limiting threshold obtained by current clipping ratio (CR) value calculation, and obtaining frequency domain data after amplitude limiting; respectively adjusting in-band data and out-band data in the frequency domain data after amplitude limiting, and utilizing a new CR value obtained according to adjusted in-band data to update a current CR value; and enabling the adjusted in-band data and the out-band data to be merged and then undergo IFFT to obtain time domain data after peak-to-average power ratio restraint. According to the method and device for restraining the peak-to-average power ratio, the appropriate time domain amplitude limiting threshold can be calculated adaptively in real time, and in-band distortion and out-band radiation of signals can be reduced to the greatest extent. Besides, on the premise that a system error vector magnitude (EVM) index is guaranteed, the peak-to-average power ratio of data is reduced as far as possible. According to the method and device for restraining the peak-to-average power ratio, the peak-to-average power ratio restraining effect is obvious, a receiver needs no modification, and no extra information needs forwarding.

Description

technical field [0001] The invention relates to the technical field of digital communication, in particular to a method and a device for suppressing peak-to-average ratio. Background technique [0002] As a multi-carrier modulation technology, OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) has the advantages of high channel utilization, strong anti-multipath fading ability, low system sensitivity to delay effects, and low technical implementation cost. , so it has been widely used in many fields, and has become one of the key transmission technologies of the fourth generation multimedia mobile communication system in the future. [0003] Compared with the single-carrier system, since the OFDM symbol is formed by adding multiple independent modulated sub-carrier signals, such a composite signal may generate relatively large peak power. The peak-to-average power ratio (PAPR, peak-to-average power ratio) of OFDM symbols is defined...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 秦伟邓单
Owner COMBA TELECOM SYST CHINA LTD