A Beamforming Scheme for MIMO and MISO FSO Links over Atmospheric Turbulence Channels with Imperfect Feedback
Publish Year: 1397
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
WACOWC01_024
تاریخ نمایه سازی: 11 شهریور 1397
Abstract:
Atmospheric turbulence is one of the major challengesin free space optical (FSO) communication systems. The channel state information (CSI) can be estimated at the receiver and fed back to the transmitter. However, in practical FSO systems, the feedback bits cannot be received error-free. Here, we propose an imperfect feedback-based beamforming technique for MIMO-FSO systems over K_distributed fading channels which employs equal gain combining (EGC) at the receiver. More precisely, we propose a weighting scheme (WS) that reduces the effect of selecting wrong aperture due to erroneous feedback where the optimal beamforming vector is obtained by minimizing the upper bound of the average bit error rate (BER) of the proposed scheme. For performance comparison, we consider two competitive schemes referred to as error-free feedback (EF) and repetition coding (RC). Comparative simulation results confirm the superiority of the proposed WS scheme over EF and RCbeamforming schemes
Keywords:
Free Space Optical Communications , MIMO , Imperfect Feedback , Beamforming , Strong Atmospheric Turbulence
Authors
Omid Mowlavi
Department of Electrical Engineering, Shahid Beheshti University, ۱۹۸۳۹۶۹۴۱۱, Tehran, Iran.
Mohammad Karimi
Department of Electrical Engineering, Shahid Beheshti University, ۱۹۸۳۹۶۹۴۱۱, Tehran, Iran
Seyed Mohammad Sajad Sadough
Department of Electrical Engineering, Shahid Beheshti University, ۱۹۸۳۹۶۹۴۱۱, Tehran, Iran