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

Dai Zhang; Shiqi Hao; Qingsong Zhao; Xiongfeng Wan; Chenlu Xu

doi:10.1117/1.OE.57.1.015107

23 January 2018 Differential phase-shift keying and channel equalization in free space optical communication system

Dai Zhang, Shiqi Hao, Qingsong Zhao, Xiongfeng Wan, Chenlu Xu

Author Affiliations +

Optical Engineering, Vol. 57, Issue 1, 015107 (January 2018). https://doi.org/10.1117/1.OE.57.1.015107

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.

Citation Download Citation

Dai Zhang, Shiqi Hao, Qingsong Zhao, Xiongfeng Wan, and Chenlu Xu "Differential phase-shift keying and channel equalization in free space optical communication system," Optical Engineering 57(1), 015107 (23 January 2018). https://doi.org/10.1117/1.OE.57.1.015107

Received: 23 October 2017; Accepted: 3 January 2018; Published: 23 January 2018

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