Differential phase-shift keying and channel equalization in free space optical communication system

被引：2
|
作者：
Zhang, Dai [1 ]
Hao, Shiqi [1 ]
Zhao, Qingsong [1 ]
Wan, Xiongfeng [1 ]
Xu, Chenlu [1 ]
机构：
[1] Elect Engn Inst, State Key Lab Pulsed Power Laser Technol, Hefei, Anhui, Peoples R China
来源：
OPTICAL ENGINEERING | 2018年 / 57卷 / 01期
基金：
中国国家自然科学基金;
关键词：
differential phase-shift keying; free space optical communication; channel equalization; MULTIPLE-SCATTERING;
D O I：
10.1117/1.OE.57.1.015107
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We present the performance benefits of differential phase-shift keying (DPSK) modulation in eliminating influence from atmospheric turbulence, especially for coherent free space optical (FSO) communication with a high communication rate. Analytic expression of detected signal is derived, based on which, homodyne detection efficiency is calculated to indicate the performance of wavefront compensation. Considered laser pulses always suffer from atmospheric scattering effect by clouds, intersymbol interference (ISI) in high-speed FSO communication link is analyzed. Correspondingly, the channel equalization method of a binormalized modified constant modulus algorithm based on set-membership filtering (SM-BNMCMA) is proposed to solve the ISI problem. Finally, through the comparison with existing channel equalization methods, its performance benefits of both ISI elimination and convergence speed are verified. The research findings have theoretical significance in a high-speed FSO communication system. (C) 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)
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页数：8
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