降低OFDM系统PAPR的改进SLM算法

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

通信学报 ›› 2018, Vol. 39 ›› Issue (4): 152-158.doi: 10.11959/j.issn.1000-436x.2018059

降低OFDM系统PAPR的改进SLM算法

季策¹,祝雯靖¹,魏颖²,贾佃霞¹

¹ 东北大学计算机科学与工程学院，辽宁沈阳 110169
² 东北大学信息科学与工程学院，辽宁沈阳 110004

出版日期:2018-04-01 发布日期:2018-04-29
作者简介:季策（1969-），女，辽宁沈阳人，博士，东北大学副教授，主要研究方向为盲信号处理和OFDM关键技术。|祝雯靖（1994-），女，辽宁沈阳人，东北大学硕士生，主要研究方向为OFDM关键技术。|魏颖（1968-），女，辽宁本溪人，博士，东北大学教授，主要研究方向为信号处理与分析、计算机视觉等。|贾佃霞（1991-），女，山东临汾人，东北大学硕士生，主要研究方向为OFDM关键技术。
基金资助:
国家自然科学基金资助项目(61673093);国家自然科学基金资助项目(61370152);沈阳市科技计划基金资助项目(F16-205-1-01)

Improved SLM algorithm for PAPR reduction in OFDM system

Ce JI¹,Wenjing ZHU¹,Ying WEI²,Dianxia JIA¹

¹ School of Computer Science and Engineering,Northeastern University,Shenyang 110169,China
² College of Information Science and Engineering,Northeastern University,Shenyang 110004,China

Online:2018-04-01 Published:2018-04-29
Supported by:
The National Nature Science Foundation of China(61673093);The National Nature Science Foundation of China(61370152);Science and Technology Foundation Project of Shenyang(F16-205-1-01)

摘要/Abstract

摘要：

为了降低正交频分复用系统中 SLM 算法的峰均功率比，减少边带信息传输，提高频谱利用率，首先提出基于转移矩阵和混沌序列的TL-SLM算法。TL-SLM算法有效减少了边带信息的传输，但PA P R的降低幅度有限。因此，进一步提出基于旋转向量的改进TL-SLM算法，即TR-SLM算法，该算法通过旋转向量的引入，产生更多的时域备选信号，达到进一步降低PA P R的目的。性能分析表明，虽然TL-SLM算法和TR-SLM算法少量增加了系统的复杂度，但PAPR性能得到了有效改善，而且较大幅度地减少了边带信息的传输。

关键词: 正交频分复用, 转移矩阵, 混沌序列, 旋转向量, 峰均功率比

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

中图分类号:

TN919.3

季策,祝雯靖,魏颖,贾佃霞. 降低OFDM系统PAPR的改进SLM算法[J]. 通信学报, 2018, 39(4): 152-158.

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.

图/表 8

图1

图2

图3

图4

表1

4种SLM算法的复杂度对比"

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)

表1

图5

图6

图7

参考文献 15

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降低OFDM系统PAPR的改进SLM算法

Improved SLM algorithm for PAPR reduction in OFDM system

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