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Optical Engineering

Differential phase-shift keying and channel equalization in free space optical communication system
Author(s): Dai Zhang; Shiqi Hao; Qingsong Zhao; Xiongfeng Wan; Chenlu Xu
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Paper Abstract

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.

Paper Details

Date Published: 23 January 2018
PDF: 8 pages
Opt. Eng. 57(1) 015107 doi: 10.1117/1.OE.57.1.015107
Published in: Optical Engineering Volume 57, Issue 1
Show Author Affiliations
Dai Zhang, State Key Lab. of Pulsed Power Laser Technology, Electronic Engineering Institute (China)
Shiqi Hao, State Key Lab. of Pulsed Power Laser Technology, Electronic Engineering Institute (China)
Qingsong Zhao, Electronic Engineering Institute,, State Key Lab. of Pulsed Power Laser Technology (China)
Xiongfeng Wan, Electronic Engineering Institute,, State Key Lab. of Pulsed Power Laser Technology (China)
Chenlu Xu, Electronic Engineering Institute,, State Key Lab. of Pulsed Power Laser Technology (China)


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