降低OFDM系统峰均功率比的自适应多级SLM方法

J4 ›› 2009, Vol. 44 ›› Issue (5): 49-55.

降低OFDM系统峰均功率比的自适应多级SLM方法

王灵垠¹,曹叶文¹,袁希强²

1. 山东大学信息科学与工程学院, 山东济南 250100; 2. 山东省气象局气象科技服务中心, 山东济南 250031

收稿日期:2008-12-16 出版日期:2009-05-16 发布日期:2009-11-18
作者简介:王灵垠（1982），男，硕士研究生，主要研究方向为OFDM的关键技术（包括PAPR，信道估计等）. Email: andrewandpipi@hotmail.com
基金资助:
国家自然科学基金资助项目（60872023）；山东省自然科学基金资助项目（Y2007G35）

Adaptive multistage SLM scheme for PAPR reduction in OFDM system

WANG Lingyin ¹ , CAO Yewen ¹ , YUAN Xiqiang ²

1.School of Information Science and Engineering, Shandong University, Jinan 250100, Shandong, China;
2. Center of Metrological Technology and Support, Shandong Metrological Bureau, Jinan 250031, Shandong, China

Received:2008-12-16 Online:2009-05-16 Published:2009-11-18

摘要/Abstract

摘要：

提出了一种基于选择性映射(SLM)降低OFDM系统峰均功率比(PAPR)的自适应多级SLM(AMSLM)方法。该方法通过逐级实施选择性映射,各级采用不同的相位加权因子集合,使得级间候选向量之间的相关性得到降低,从而使PAPR性能获得了更大地改善;同时设定适当的门限值,若当前级所获得的PAPR最低值大于该门限值,则自动进入下一级优化过程,否则终止整个优化过程。仿真结果表明,与SLM方法相比,AMSLM方法可以获得几乎相同或者更好的PAPR性能,同时,计算复杂度也得到了明显地降低, 如当总级数为4时,AMSLM方法的计算复杂度较SLM降低了4781％。

关键词: 正交频分复用;峰均功率比;选择性映射

Abstract:

Based on selected mapping (SLM) for peaktoaverage power ratio (PAPR) reduction in OFDM system, an improved version, named adaptive multistage selected mapping (AMSLM) is proposed. By using different phase weighting factor set and selected mapping in each stage, the property of correlation of candidate vectors in different stages is reduced, which improves the PAPR performance. Moreover, with the purpose of reducing the computational complexity, a proper threshold is introduced, where if the minimum value of PAPR obtained in current stage is higher than the threshold, the optimization process for next stage will continue; otherwise, the whole optimization process will be terminated. Simulation results show that, compared with SLM, proposed AMSLM scheme has almost the same or better performance in PAPR reduction. Meanwhile, the computational complexity is reduced dramatically, where AMSLM with four stages outperforms SLM by 4781％ in computational complexity.

Key words: orthogonal frequency division multiplexing; peaktoaverage power ratio; selected mapping

中图分类号:

TN914

. 降低OFDM系统峰均功率比的自适应多级SLM方法[J]. J4, 2009, 44(5): 49-55.

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