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Method for lowering peak-flat ratio of low complexity orthogonal frequency division duplex communication system

An orthogonal frequency division and multiplexing communication technology, applied in the field of OFDM modulation digital communication system, can solve the problem of high computational complexity and achieve the effect of small computational load

Inactive Publication Date: 2007-01-24
UNIV OF ELECTRONICS SCI & TECH OF CHINA ZHONGSHAN INST +1
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Problems solved by technology

[0007] For the companding algorithm provided by "Amplitude Companding Suppression Method for Peak-to-Average Ratio of Orthogonal Frequency Division Multiplexing Communication System" (patent application number: 02136339.0) proposed by Hu Liangliang and Zhou Yuefeng and others at Shanghai Jiaotong University, its computational complexity is relatively high

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  • Method for lowering peak-flat ratio of low complexity orthogonal frequency division duplex communication system
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  • Method for lowering peak-flat ratio of low complexity orthogonal frequency division duplex communication system

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Embodiment Construction

[0046] The technical solution of the present invention will be further described through specific implementation below.

[0047] The present invention is applied to OFDM systems. The system adopts QPSK modulation, a value is 3, the number of sub-carriers is 128, SNR=10dB, AWGN channel. The specific steps are:

[0048] 1. The transmitting end sends the OFDM modulated baseband signal to the power adjustment unit and the time delay compensation unit for power adjustment and time delay compensation. That is: reduce the signal power to the original k times (0<k<1), and then adjust the signal delay to make the signal transmission reach synchronization.

[0049] 2. Calculate the signal amplitude value before compression, and perform compression operation on the baseband signal amplitude value according to formula (3).

[0050] 3. Calculate the amplitude value of the compressed signal, and divide the compressed signal amplitude value by the pre-compressed signal amplitude value to ...

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Abstract

This invention provides a method for reducing peak balance power ratio in a low complicated OFDM communication system, which compresses the amplitude of the base band signals modulated by the OFDM and expands the received signals at the receiving end to resume signals, which can reduce the ratio of the signal peak power and the mean power to suppress the peak and mean power ratio of the system and neglect the influence of signals used in various communication systems modulated by the OFDM.

Description

Technical field: [0001] The invention relates to a method for reducing peak-to-average ratio in a low-complexity orthogonal frequency division multiplexing communication system, which belongs to the field of digital communication using electromagnetic wave technology, and particularly relates to digital television, single-carrier OFDM communication systems, multi-carrier OFDM communication systems, and wireless local area networks (WLAN) and other digital communication systems using OFDM modulation. Background technique: [0002] Orthogonal Frequency Division Multiplexing Modulation (OFDM) is widely used because of its high channel utilization and good anti-fading ability. However, in an OFDM communication system, as the number of carriers increases, the value of the peak-to-average ratio (PAPR) of the superimposed signal becomes larger. Therefore, the dynamic range of the modulated signal is large, which requires the power amplifier in the system to have a high linear ampl...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 罗仁泽朱维乐
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA ZHONGSHAN INST
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