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Method and device for processing multi-carrier signal

A multi-carrier signal and processing method technology, applied in the direction of multi-frequency code system, etc., can solve the problem of poor PAPR suppression performance, achieve the effect of avoiding peak rise again and improving PAPR suppression performance

Inactive Publication Date: 2013-09-25
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At this time, it is possible that the peak value that rises again is greater than the original amplitude of the sampling point, then the peak offset processing operation does not really reduce the PAPR, resulting in poor PAPR suppression performance

Method used

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  • Method and device for processing multi-carrier signal
  • Method and device for processing multi-carrier signal
  • Method and device for processing multi-carrier signal

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Experimental program
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Embodiment 1

[0096] Figure 4 A flow chart of the multi-carrier signal processing method in Embodiment 1 of the present invention is shown. Assuming that the target threshold in this embodiment is Th, K comparison thresholds {Th_comp 0 , Th_comp 1 ,...,Th_comp k ,...,Th_comp K-1}, and the signal to be processed is the time-domain OFDM multi-carrier signal s=[s(0),s(1),...,s(n),...,s(JN-1)], where J is Oversampling multiple, N is the number of subcarriers. see Figure 4 , the method includes:

[0097] In step 401, a current comparison threshold is selected from K comparison thresholds.

[0098] In this step, when selecting the current comparison threshold, it can be selected in descending order, that is, the larger comparison threshold is selected first, and then the smaller comparison threshold is selected; of course, it can also be selected in other commonly used orders.

[0099] In step 402, a sampling point in the signal to be processed that has not been compared with the curren...

Embodiment 2

[0137] The multi-carrier signal processing process in the foregoing embodiment 1 is mainly performed at the transmitting end of the signal. In this process, for the purpose of reducing the PAPR, some sampling points are subjected to at least one single-point peak cancellation processing. The amplitude of these sampling points Value changes will generate PAPR suppression noise in the signal to be processed, which may have a negative impact on the bit error rate (BER) of the received signal at the receiving end. In order to reduce the impact of PAPR suppressed noise, thereby reducing the BER at the receiving end, this embodiment further adds clipping noise reconstruction (Cnr clipping noise reconstruction, CNR) processing at the receiving end on the basis of Embodiment 1. Specifically, when there is no sampling point that is not canceled by the peak value in the signal to be processed, performing clipping noise reconstruction processing on the time domain signal of the signal to ...

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Abstract

The invention discloses a method and a device for processing multi-carrier signal. The method comprises the following steps of: A, taking a sampling point in a signal to be processed as a target sampling point and performing single-point peak counteraction processing on the target sampling point according to a preset target threshold, wherein the amplitude of the target sampling point is higher than a preset comparison threshold; the target sampling point is not subjected to peak counteraction processing; and the comparison threshold is greater than or equal to the target threshold; and B, utilizing a result obtained by performing the single-point peak counteraction processing on the target sampling point to update the signal to be processed, and when the sampling points not subjected to the peak counteraction processing exist in the updated signal to be processed, returning to execute the step A. The scheme of the invention can effectively improve PAPR inhibiting performance.

Description

technical field [0001] The invention relates to a nonlinear peak suppression technology in an Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) system, in particular to an OFDM multi-carrier signal processing method and system for peak cancellation. Background technique [0002] In an OFDM system, a given channel is usually divided into several independent sub-channels in the frequency domain, a sub-carrier is used for modulation on each sub-channel, and each sub-carrier is transmitted in parallel. Since this series of sub-channel signals are accumulated in the time domain and overlapped to form a multi-carrier signal, there will be a large peak pulse at some time, which will easily cause a large peak-to-average ratio (PAPR, Peak-to-average- power ratio), that is, the ratio of the maximum peak power of the signal to the average power is large. However, existing power amplifiers cannot linearly amplify signals with a large frequenc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
Inventor 但黎琳肖悦彭永睿李腾文青松李少谦严春林张战加山英俊
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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