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

An orthogonal frequency division and multiplexing communication technology, which is applied in the field of digital communication systems with OFDM modulation, can solve the problem of high computational complexity and achieve the effect of small calculation amount

Inactive Publication Date: 2009-10-21
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
  • Method for lowering peak-flat ratio of low complexity orthogonal frequency division duplex communication system
  • 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

[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

The invention provides a low-complexity method for reducing the peak-to-average ratio in an OFDM communication system. The method compresses the amplitude of the OFDM-modulated baseband signal, expands the received signal at the receiving end, and Restore the signal. The invention can reduce the ratio of the peak power of the signal to the average power, thereby suppressing the peak-to-average ratio of the system, and the influence on the signal can be ignored. The invention is easy to implement and can be used in various communication systems that adopt OFDM for modulation.

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 Patents(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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