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Research on PAPR Reduction for OFDM Systems

Author: LiuHua
Tutor: WangJinKuan
School: Northeastern University
Course: Communication and Information System
Keywords: OFDM PAPR PTS Threshold
CLC: TN929.53
Type: Master's thesis
Year: 2011
Downloads: 1
Quote: 0
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Abstract


Orthogonal frequency division multiplexing is a high speed transmission technology under wireless environment circumstance, high efficiency advantages of spectrum and resistance of multipath fading, widely used in satellite communications, digital radio and broadband wireless access network and other fields, and has become the key technology of the next generation wireless communication system. But orthogonal frequency division multiplexing systems exist serious peak-average power ratio, causing the distortion of signal, making the system performance serious deterioration, so high peak-average power reduction technology is one of the OFDM’s key technology and how to effectively restrain peak-average-power has important theoretical significance and application value.This paper deeply studied the fundamental principle of orthogonal frequency division multiplexing systems, and further expounds the key technology of systems urgently to be solved. Analyzed the reasons of the peak-average power ratio emerge, the effects of amplifier’s nonlinear to OFDM systems, solutions of OFDM systems’ peak-average-power ratio, etc.This article focuses on the partial transmission sequence algorithm hold characteristics of good inhibiting performance of PAPR and high computational complexity, and puts forward the based on preset threshold improved partial transmission sequence algorithm. Based on traditional partial transmission sequence algorithm, through narrowing the search space of phase factor, and significantly reduce the computational complexity, reduce the cost of hardware implementation. At the same time, considering the OFDM systems of high peak power signal appears low probability, puts forward the preset threshold’s T-PTS algorithm, further decreasing the PTS algorithm of computational complexity. Simulation experiments show that the proposed new algorithm can obtain the good performance and complexity compromise, has the very high practicability.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Mobile Communications > Cellular mobile communications systems (mobile phones, mobile phone handsets )
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