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Optimum wave clipping method

A technology of clipping and optimizing factors, applied in the field of communication, which can solve the problems of increased bit error rate, signal distortion, signal amplitude reduction, etc.

Inactive Publication Date: 2004-06-09
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The main disadvantage of the existing combined clipping OFDM system is that clipping directly reduces the amplitude of the signal, which will cause signal distortion. Therefore, while the ratio of signal peak power to average power is reduced, the bit error rate will be significantly increased. high

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Embodiment Construction

[0050] The main innovation of the transmitting part of the present invention is to select a set of optimal phase factors by comparison, so that the multiplied and superimposed data is least affected by Clip; it can be realized by programming, and can be made into corresponding phase factors using existing technologies. The hardware realizes the optimization of the optimal phase factor to the data point; then, it combines with other modules to form the transmitter system of the present invention.

[0051] The main innovation of the receiving part of the invention is to extract the optimization factor from the received side information, multiply each group of data by the conjugate of the corresponding optimization factor, and superimpose and restore. Likewise, the communication method proposed by the present invention can be realized through programming according to the method described, and then the corresponding hardware can be manufactured by using the prior art to form the re...

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Abstract

This invention discloses a new optimizing chopper method, in a selected optimizing module 12, data nodes on each subcarrier are divided into groups to carry out IFFT and to multiply data got by each group and selectable phase factors to be laminated to get a cluster of optimum phase factors, thus the laminated data is the least influenced by chopper. After the receiving end signals pass FFT, the data node is deselected and optimized at module 13 to recover the data, either reducing the ratio of a signal peak power and balanced power or reducing BER of system transmission to optimize the transmission property.

Description

technical field [0001] The invention belongs to the technical field of communication, in particular to an orthogonal frequency division multiple access system using a clipping method. Background technique [0002] As we all know, in the existing communication technology, Orthogonal Frequency Division Multiple Access (OFDM) technology has become the main candidate technology for future mobile multimedia communication because of its high spectrum utilization rate, good anti-multipath fading and anti-interference performance. one. [0003] One of the main disadvantages of the OFDM system is that the ratio of the signal peak power to the average power is too high. Usually, the clipping method is used to reduce the ratio of the signal peak power to the average power. The working principle of the clipping method (referred to as Clip) is as follows: figure 1 shown. Among them, module 3 is a clipping module, and its principle is: a predetermined threshold value T h , for the OFDM...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J11/00H04L27/26H04L27/32
Inventor 雷霞肖悦唐友喜李少谦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA