降低OFDM系统PAPR的改进SLM算法

doi:10.11959/j.issn.1000-436x.2018059

Abstract

Abstract:

In order to reduce the peak to average power ratio (PAPR) of the conventional selective mapping (SLM) algorithm,decrease the transmission of side-band information,and improve the spectral efficiency in the orthogonal frequency division multiplexing (OFDM) system,the TL-SLM algorithm based on the conversion matrix and the chaotic sequence was proposed firstly.Although the TL-SLM algorithm could effectively decrease the transmission of side-band information,the reduction of PA P R was limited.To solve this problem,an improved TL-SLM algorithm based on the rotation vector was proposed,which was the TR-SLM algorithm.TR-SLM algorithm introduced the rotation vector to generate more time-domain alternative signals to further reducing the PA P R.The performance analysis shows that although the TL-SLM algorithm and the TR-SLM algorithm increase the complexity a little,the PA P R performance is effectively improved and the transmission of side-band information is greatly reduced.

Key words: orthogonal frequency division multiplexing, conversion matrix, chaotic sequence, rotation vector

CLC Number:

TN919.3

Ce JI,Wenjing ZHU,Ying WEI,Dianxia JIA. Improved SLM algorithm for PAPR reduction in OFDM system[J]. Journal on Communications, 2018, 39(4): 152-158.

Figures/Tables 8

SLM算法	复杂度
SLM算法	复数乘法	复数加法
传统SLM	$(\frac{M L N}{2}) lb (L N)$	MLN lb(LN)
T-SLM	$(\frac{M L N}{2}) lb (L N)$	MLN lb(LN)+3 MLN
TL-SLM	$(\frac{M L N}{2}) lb (L N) + 2 M (L N - 1)$	MLN lb(LN)+3 MLN+M(LN?1)
TR-SLM	$(\frac{M L N}{2}) lb (L N) + 2 M (L N - 1)$	MLN lb(LN)+9 MLN+M(LN?1)

References 15

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