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access icon openaccess Performance analysis of hybrid FSO/RF communication systems with Alamouti coding or antenna selection

This is an open access article published by the IET under the Creative Commons Attribution-NonCommercial-NoDerivs License (http://creativecommons.org/licenses/by-nc-nd/3.0/)
Received 17/01/2019, Accepted 25/01/2019, Published 27/02/2019

In this work, a novel dual-hop relay-assisted hybrid free space optical/radio frequency (FSO/RF) communication system is presented. In this system, RF signal is transmitted from two antennas, and then forwarded by a single antenna relay through FSO channel. This is the first time that performance of using Alamouti coding (AC) or antenna selection (AS) at the transmitter of a hybrid FSO/RF system is investigated. FSO link has gamma-gamma atmospheric turbulence, and in order to get closer to the actual results, the effect of pointing error is also considered. For the first time closed-form expressions are derived for bit error rate and outage probability of the proposed system and validated through MATLAB simulations. Results indicate that in this structure, there is slight performance difference between AC and AS schemes. Hence, due to more complexity, power consumption and latency of AC, AS is recommended. Dual-hop, hybrid FSO/RF system significantly improves performance and reliability of the system, and is particularly suitable for long-range applications that direct RF communication between source and destination is not possible. Considering these advantages this structure is particularly suitable for mobile communications which has power and processing limitations.

Inspec keywords: atmospheric turbulence; radiocommunication; error statistics; free-space optical communication; relay networks (telecommunication); telecommunication network reliability

Other keywords: RF signal; single antenna relay; outage probability; antenna selection; bit error rate; RF communication; FSO link; dual-hop relay-assisted hybrid free space optical/radio frequency; gamma-gamma atmospheric turbulence; Alamouti coding; FSO channel; hybrid FSO/RF communication systems

Subjects: Reliability; Radio links and equipment; Free-space optical links; Other topics in statistics

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