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

A technology of multi-carrier modulation and peak-to-average ratio, applied in multi-frequency code systems and other directions, can solve problems such as information redundancy and achieve the effect of increasing reliability

Inactive Publication Date: 2009-12-09
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in order to ensure the accuracy of the phase information, it is necessary to introduce encoding technology to transmit the phase information, which will bring some information redundancy

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

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Embodiment Construction

[0033] Various preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0034] The core idea of ​​the method for reducing the peak-to-average ratio in the multi-carrier modulation system of the present invention is to improve the peak-to-average ratio by using spare subcarriers in the OFDM system. Multiple channels of auxiliary information are transmitted on the spare subcarriers, each channel of auxiliary information is combined with effective data, and then the peak-to-average ratio of each channel after IFFT output is calculated, and the optimal peak-to-average ratio is selected through multi-channel comparison. Since the vacant subcarrier data is located on both sides of the OFDM symbol, it will be interfered by adjacent OFDM symbols, so it is usually discarded at the receiving end, and it is usually filled with zeros. In the method of the present invention, some special data is inserted for the vacan...

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Abstract

A method for reducing the peak-to-average ratio in a multi-carrier modulation system of the present invention comprises the following steps: transmitting multiple paths of auxiliary information on vacant subcarriers, each path of auxiliary information is linearly combined with valid data; calculating the IFFT output of each path Peak-to-average ratio, through multiple comparisons, select the optimal peak-to-average ratio; weight the spare subcarrier data. The method of the invention does not need to add additional redundant transmission phase factor information, which increases the reliability of the system; although the weighted system performance is affected to a certain extent, it is within the allowable range compared with the contribution of reducing the peak-to-average ratio to the system performance.

Description

technical field [0001] The present invention relates to a method for reducing peak-to-average power ratio (PAPR) in a wireless communication system, especially in an Orthogonal Frequency Division Multiplexing (OFDM) system, and in particular to a method for reducing PAPR in a multi-carrier modulation system method. Background technique [0002] The Orthogonal Frequency Division Multiplexing (OFDM) system in the prior art 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 ...

Claims

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Application Information

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