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Peak cancellation method for OFDM system

A peak value and threshold value technology, applied in the field of wireless communication, can solve the problems of reducing complexity, serial offset processing multiple interference and computational complexity, etc., to achieve the effects of reducing interference, improving PAPR suppression performance, and reducing the number of offsets

Inactive Publication Date: 2017-03-15
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

The Serial Peak Cancellation method (Serial Peak cancellation, SPC) cancels the signal exceeding the set threshold through the serial processing mode, which reduces the complexity and reduces the PAPR well. However, the excessive concentration of the serial Offset processing still brings more interference and computational complexity

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  • Peak cancellation method for OFDM system
  • Peak cancellation method for OFDM system
  • Peak cancellation method for OFDM system

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Embodiment Construction

[0050] Below in conjunction with accompanying drawing and embodiment, describe technical solution of the present invention in detail:

[0051] Main steps of the present invention include:

[0052] a. Confirm the signal peak value: according to the index order of the OFDM signal sample point value in the time domain, by comparing the signal amplitude with a given threshold value and comparing the signal amplitude values, find a signal peak value exceeding the threshold;

[0053] b. Peak cancellation: taking the signal peak value obtained in step a as the center and subtracting a weighted cancellation function of length L, so that at least the amplitude value of the peak value is equal to the threshold value;

[0054] c. Judging whether the sample points of one OFDM symbol have been traversed, if so, then end; if not, then return to step a.

[0055] Correspondingly, the main steps of implementing the algorithm are: 1. Comparing the signal amplitude with the threshold value TH; ...

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Abstract

The invention belongs to the technical field of wireless communication, and relates to a peak cancellation method for an OFDM system. The method disclosed by the invention comprises the following steps of according to the index sequence of time-domain OFDM signal sample values, accurately finding out a signal peak, which is greater than the threshold, by comparing signal amplitudes with a given threshold TH and comparing the signal amplitudes, and then, subtracting a weighted cancellation function with the length of L by taking the peak as the centre, so that the amplitude value of the peak is at least equal to a threshold value; and, after one-time peak cancellation is completed, sequentially finding out the next peak, which is greater than the threshold, and repeating the peak cancellation process till a sample of an OFDM symbol is traversed. Compared with the existing method, the improved method has the advantages that: the bit error rate performance of the system can be improved in a condition that the peak-to-average power ratio performance is not lost; and the method is an effective peak-to-average power ratio inhibition having low complexity.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to an improved peak-to-average ratio (Peak-to-Average Power Ratio, PAPR)-based peak-to-average ratio (PAPR) in an Orthogonal Frequency Division Multiplexing (OFDM) system. offset method. Background technique [0002] OFDM is a multi-carrier technology, and it also inherits the advantages and disadvantages of multi-carrier systems. In an OFDM communication system, the transmitted signal is the superposition of signals on multiple subcarriers, which leads to a large degree of freedom in the signal amplitude, and the amplitude of the generated baseband signal is unstable. Generally, PAPR is used to measure the peak fluctuation characteristic of OFDM signal. From the research so far, there are two ways to solve the peak fluctuation problem of multi-carrier signals: one is to increase the linear dynamic range of the amplifier, but this increases the cost of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2614
Inventor 魏鹏但黎琳李帆张毅李少谦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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