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Method for restraining peak average power ratio of OFDM system

A peak-to-average power ratio, orthogonal frequency division technology, applied in the field of wireless communication, can solve the problem of high PAPR of complex baseband OFDM signals, achieve the effect of effective peak processing method, reduce calculation overhead, and reduce calculation complexity

Inactive Publication Date: 2012-07-18
ZTE CORP
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved in the present invention is to provide a method for suppressing the peak-to-average power ratio of an OFDM system, which can effectively solve the problem of excessively high PAPR of complex baseband OFDM signals

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  • Method for restraining peak average power ratio of OFDM system
  • Method for restraining peak average power ratio of OFDM system
  • Method for restraining peak average power ratio of OFDM system

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Embodiment Construction

[0031] First, the method of the present invention is described, as figure 1 shown, including the following steps:

[0032] 101) Perform peak discrimination on the input OFDM signal, and determine the direction of the maximum amplitude;

[0033] 102) Perform phase rotation on the original OFDM signal, so that the maximum amplitude direction is located on the real axis;

[0034] 103) Take out the real part of the rotated signal, and use the subcarrier reservation method for processing;

[0035] Among them: the Tone Reservation (Tone Reservation, TR) method is an existing method, specifically reserving a part of the subcarrier C in the frequency domain data, and using the peak reduction signal c generated by C to reduce the PAPR value of the OFDM signal. According to the requirements of distortion-free transmission, the reserved subcarrier signal should meet:

[0036] X k + C k = ...

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Abstract

The invention relates to a method for inhibiting the peak-to-average power ratio (PAPR) of an orthogonal frequency-division multiplexing (OFDM). The method comprises the follows steps: carrying out the peak judgement to an input OFDM signal according to an amplitude gate limit and determining the amplitude to be processed; carrying out the phase rotation to the input OFDM signal so that the direction of the amplitude to be processed is located on a real axis; subjecting to the PAPR processing to the rotated signal by utilizing the sub carrier wave reservation method; determining whether the PAPR meets the requirement; directly finishing if the PAPR meets the requirement; and carrying out the peak processing by utilizing the modified Newton iteration formula. The inhibiting method carries out the PAPR processing on the maximum amplitude direction by utilizing the Newton iteration algorithm; therefore, the PAPR processing performance is remarkably improved when a complex baseband signalis processed, and the computation complexity is greatly reduced.

Description

technical field [0001] The invention relates to wireless communication, in particular to a method for inhibiting the peak-to-average power ratio (PAPR) of an orthogonal frequency division multiplexing OFDM system. Background technique [0002] The main weakness of the Orthogonal Frequency Division Multiplexing (abbreviated as OFDM) system is the problem that its Peak to Average Power Ratio (referred to as PAPR) is too high. People have conducted in-depth research on this and proposed many solutions, among which the important ones are: clipping and filtering, coding, subcarrier insertion, subcarrier reservation, constellation extension, partial transmission sequence, selective mapping, and interleaving. Among them, the subcarrier reservation method has a better application prospect. The main idea of ​​the subcarrier reservation method is: reserve a part of the subcarrier C in the frequency domain data, and use the peak reduction signal c generated by C to reduce the frequency...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
Inventor 王衍文支周李岩韦辉
Owner ZTE CORP