23 January 2018 Differential phase-shift keying and channel equalization in free space optical communication system
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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.
© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)
Dai Zhang, Dai Zhang, Shiqi Hao, Shiqi Hao, Qingsong Zhao, Qingsong Zhao, Xiongfeng Wan, Xiongfeng Wan, Chenlu Xu, 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 . Submission: Received: 23 October 2017; Accepted: 3 January 2018
Received: 23 October 2017; Accepted: 3 January 2018; Published: 23 January 2018
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