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Method for realizing CDMA signal wave elimination

A signal and clipping technology, applied in multiplexing communications, electrical components, code division multiplexing systems, etc. Effectiveness of resource requirements, reduced PAR, and better peak shaving performance

Inactive Publication Date: 2010-04-21
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The advantage of this method is that it has less impact on EVM, but it is not suitable for systems with limited code channels, and the available code channels need to be modified at any time, which is not conducive to receiver despreading

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  • Method for realizing CDMA signal wave elimination
  • Method for realizing CDMA signal wave elimination
  • Method for realizing CDMA signal wave elimination

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Embodiment Construction

[0040] The phase and magnitude of windowing by the method of the present invention are determined by the location and magnitude of the peak. For the case where there are multiple peaks, it is necessary to compromise the influence of the position and amplitude of the peaks on the window. Some literature proposes to use convolution method to add window. But the function of convolution will be similar to a low-pass filter, which will play the role of accumulating amplitude or power. In the case of no prior knowledge of the peak amplitude, it is easy to cause the windowing amplitude to be too large, so that the compensated signal will be out of phase with the input signal, and the EVM index will deteriorate sharply.

[0041] The method for reducing the CDMA signal peak-to-average ratio of the present invention is as follows:

[0042] Firstly, the input signal x(n) is divided into segments with a length of W, and peak detection and cancellation are performed on each segment. The...

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Abstract

This invention relates to a method for realizing CDMA signal clipping capable of realizing joint cancel to multiple peak values of input signals characterizing in computing suitable windowed positionto carry out jointly windowed process to multiple peak values to realize the cancel to the peak values, among which, the windowed phase and amplitude are determined by those of peak values of the inputsignals, said windowed phase is determined by the derivate of said windowed function, which effectively reduces PAR of the system and reduces the resource demand for peak value process.

Description

technical field [0001] The invention relates to a method for realizing signal clipping in the field of digital mobile communication, in particular to a combined clipping method capable of effectively reducing the peak-to-average ratio of CDMA signals. Background technique [0002] In a wireless transmission system, in order to ensure that the signal is transmitted without distortion, a certain dynamic range needs to be reserved. Dynamic range can be defined by peak-to-average ratio. In multi-carrier, since the average transmit power needs to be increased, the signal dynamic range is compressed. But the peak-to-average ratio of multi-carrier is not lower than that of single carrier, but higher. In order to meet the compromise between the average transmit power and the maximum transmit power, it is necessary to cut off the peak value of the signal waveform transmitted by the multi-carrier to ensure the efficiency of the power amplifier. The methods of cutting off the peak v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04J13/00
Inventor 肖炼斌刘虎李颖
Owner ZTE CORP
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