access icon free SIMO subcarrier PSK FSO links with phase noise and non-zero boresight pointing errors over turbulence channels

© The Institution of Engineering and Technology
Received 29/06/2018, Accepted 11/01/2019, Revised 26/12/2018, Published 15/01/2019

Terrestrial free-space optical (FSO) communication systems with subcarrier intensity modulation have experienced a particular research attention in the recent past. However, their performance strongly degrades in the presence of atmospheric turbulence, pointing errors, and phase noise impairments. In order to overcome these limitations, the authors consider a receiver diversity scheme of a typical subcarrier phase-shift keying (PSK) system and investigate the performance by means of the average symbol error probability (ASEP). They assume a wide range of turbulence conditions, non-zero boresight pointing errors, and phase noise strengths described through the gamma-gamma, Beckmann, and Tikhonov distributions, respectively. Novel approximate ASEP expressions are derived for single-input single-output and single-input multiple-output (SIMO) configurations. Appropriate numerical results are depicted and validated by Monte Carlo simulations.

Inspec keywords: diversity reception; intensity modulation; optical links; error statistics; phase noise; Monte Carlo methods; optical modulation; phase shift keying; free-space optical communication; atmospheric turbulence

Other keywords: phase noise strengths; subcarrier intensity modulation; turbulence conditions; single-input single-output; subcarrier phase-shift keying system; novel approximate ASEP expressions; phase noise impairments; terrestrial free-space optical communication systems; average symbol error probability; turbulence channels; Monte Carlo simulations; nonzero boresight pointing errors; atmospheric turbulence; gamma-gamma distribution; Tikhonov distribution; single-input single-output configuration; SIMO subcarrier PSK FSO links; single-input multiple-output configuration; receiver diversity scheme; Beckmann distribution; pointing errors

Subjects: Monte Carlo methods; Modulation and coding methods; Free-space optical links

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