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基于改进蝙蝠算法的CO-OFDM系统峰均比抑制技术

PAPR Reduction Method for CO-OFDM System Based on Improved Bat Algorithm

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摘要

为了抑制相干光正交频分复用系统中的峰值平均功率比,采用蝙蝠算法优化系统子载波的相位.同时针对蝙蝠算法存在的易陷入局部最优和收敛精度不高的问题,对蝙蝠算法进行改进.在蝙蝠的速度更新公式中加入蝙蝠的自我学习部分,并引入惯性权值和学习因子,在保证算法收敛速度的同时尽可能提高算法的收敛精度,防止算法出现早熟收敛情况.采用改进算法对正交幅度调制、100 Gb/s的相干光正交频分复用系统进行仿真实验,仿真结果表明,改进算法有较强的搜索能力和较高的搜索精度,使正交频分复用信号的峰值平均功率比降低了5.48 dB,相对于蝙蝠算法降低了0.52 dB,改进算法的峰值平均功率比抑制性能得到了进一步的提高.

Abstract

To reduce Peak to Average Power Ratio (PAPR) in CO-OFDM systems, bat algorithm was applied for optimizing the sub-carrier phase. Moreover, the algorithm was improved aiming at the problems that the bat algorithm is easy to fall into local optimum and has low convergence precision. In the velocity updating formula, the bat's self study part, the inertia weight and learning factor were introduced to ensure the algorithm convergence speed and improve the convergence precision of the algorithm at the same time as much as possible, avoiding the occurrence of premature convergence. The simulation was carried out in a 100 Gb/s, 4QAM CO-OFDM system, and the simulation results show that the improved algorithm has been obviously improved in searching ability and accuracy. The PAPR can be reduced by about 5.48 dB and 0.52 dB compared with ones of the original OFDM and the BA-OFDM, respectively. The improved algorithm shows better effects on reducing PAPR.

广告组1 - 空间光调制器+DMD
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中图分类号:TN913.7

DOI:10.3788/gzxb20164510.1006001

基金项目:The Natural Science Foundation of Tianjin, China (No. 15JCYBJC17000), the Science Foundation for the Youth of Hebei Province, China (Nos. F2014202036, F2015202331), and the High-level Talents Program of Hebei Province, China (Nos. C2013001048, GCC2014011)

收稿日期:2016-05-17

修改稿日期:2016-08-15

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刘剑飞:河北工业大学 电子信息工程院 电子材料与器件天津市重点实验室, 天津 300401
王少影:河北工业大学 电子信息工程院 电子材料与器件天津市重点实验室, 天津 300401
曾祥烨:河北工业大学 电子信息工程院 电子材料与器件天津市重点实验室, 天津 300401
卢嘉:河北工业大学 电子信息工程院 电子材料与器件天津市重点实验室, 天津 300401
王蒙军:河北工业大学 电子信息工程院 电子材料与器件天津市重点实验室, 天津 300401

联系人作者:刘剑飞(jfliu@hebut.edu.cn)

备注:LIU Jian-fei (1968-), male, professor, Ph.D., mainly focuses on fiber optical communication technology.

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引用该论文

LIU Jian-fei,WANG Shao-ying,ZENG Xiang-ye,LU Jia,WANG Meng-jun. PAPR Reduction Method for CO-OFDM System Based on Improved Bat Algorithm[J]. ACTA PHOTONICA SINICA, 2016, 45(10): 1006001

刘剑飞,王少影,曾祥烨,卢嘉,王蒙军. 基于改进蝙蝠算法的CO-OFDM系统峰均比抑制技术[J]. 光子学报, 2016, 45(10): 1006001

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