Amplify-and-Forward Two-Way Relaying System over Free-Space Optics Channels

TL;DR

This paper evaluates the performance of a two-way amplify-and-forward relaying system over free-space optical channels, considering atmospheric effects and pointing errors, and provides bounds on outage and error probabilities.

Contribution

It introduces a comprehensive analysis of a two-way SIM AF relaying system over FSO channels with atmospheric turbulence, deriving tight bounds and practical performance insights.

Findings

System performs well under weak turbulence with SNR around 30 dB for low error rates.

Pointing errors significantly degrade system performance.

Derived bounds help in designing reliable FSO communication systems.

Abstract

In this paper, we analyze the performance of a two- way subcarrier intensity-modulated (SIM) amplify-and-forward (AF) relaying system over free-space optics (FSO) communication channels. The analysis takes into consideration attenuations due to atmospheric turbulence, geometric spread and pointing errors at the same time. We derive, in generalized infinite power series expressions, the tight upper and lower bounds of the overall outage probability and average probability of errors of the system. The study finds that this two-way subcarrier intensity- modulated AF relaying system using a binary phase shift keying (BPSK) modulation could be used for practical applications in case of a weak turbulence regime in which the required SNR is about 30 dB to obtain the average bit error probability of 10-6. It is also noted that the pointing errors clearly degrade the performance of the two-way subcarrier intensity-modulated AF relaying system.