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Method for reducing peak balance ratio of multi-carrier modulation system

A technology of multi-carrier modulation and peak-to-average ratio, applied in the direction of multi-frequency code system, etc., can solve the problems of receiving end error, increase redundancy, information redundancy, etc., achieve high reliability and save computing costs

Inactive Publication Date: 2007-02-14
ZTE CORP
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Problems solved by technology

The advantage of the PTS method is that there is no signal distortion, and the disadvantage is that M IFFT processing is required, and redundancy is required to transmit phase factor information
[0010] Regardless of the PTS method or the SLM method, it is necessary to strictly ensure the high accuracy of the additionally transmitted phase information. Otherwise, once the phase information is wrong, the receiving end will be completely wrong. Therefore, in order to ensure the accuracy of the phase information, it is necessary to introduce encoding technology for transmission. The phase information, which will bring about the redundancy of some information

Method used

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  • Method for reducing peak balance ratio of multi-carrier modulation system
  • Method for reducing peak balance ratio of multi-carrier modulation system

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Embodiment Construction

[0027] Below in conjunction with the accompanying drawings, various preferred embodiments of the present invention will be described in detail, so as to make the technical solution of the present invention and its beneficial effects obvious.

[0028] The core idea of ​​the method for reducing the peak-to-average ratio of the multi-carrier modulation system of the present invention is to insert data into spare sub-carriers of the OFDM system through a table look-up method to improve the peak-to-average ratio. Spare sub-carrier data is located on both sides of the OFDM symbol and will be interfered by adjacent OFDM symbols. It is usually discarded at the receiving end and is usually filled with zeros. In the method of the present invention, some special data are inserted for the vacant subcarriers to improve the peak-to-average ratio. The advantage of the method of the invention is that it utilizes the spare sub-carriers, contributes to reducing the peak-to-average ratio under t...

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Abstract

This invention relates to a method for reducing peak-to-average ratio of multi-carrier modulation system including: cutting in special data on a vacancy sub-carrier of the modulation system, making an inquiry list to overlap the original data and the corresponding data in the enquiry list in linearity and the peak-to -average ratio output by the IFFT is the smallest, enquiring said list to get assistant data to be combined with effective data for IFFT output.

Description

technical field [0001] The present invention relates to a wireless communication system, especially a method for reducing peak-to-average power ratio (PAPR) in an Orthogonal Frequency Division Multiplexing (OFDM) system, especially a method for reducing PAPR in a multi-carrier modulation system . Background technique [0002] The existing Orthogonal Frequency Division Multiplexing (OFDM) system is a multi-carrier modulation system. At a certain moment, if multiple carriers are superimposed in the same direction, a large peak will appear, so the power amplifier is required to have a large linear region . If the linear region is smaller than the maximum peak value of the signal, signal distortion will occur when the peak value enters the nonlinear region of the power amplifier, resulting in intermodulation interference and out-of-band radiation between subcarriers, destroying the orthogonality between subcarriers and reducing system performance. If the power amplifier works ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 郭阳郑新春石苗
Owner ZTE CORP
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