Abstract

This paper analyzes the unified performance of partial relay selection protocol for multiple relay assisted free space optical (FSO) network over exponentiated weibull (EW) links. The unification has been done for heterodyne and intensity modulation/direct (IM/DD) detection techniques. We have considered a decode and forward (DF) based network consisting of multiple finite sized two way relays (TWR) between two distant terminals. In partial relay selection protocol, two TWRs are chosen in order to create the bidirectional communication path between the two terminals. The considered protocol compresses the requirement of channel state information (CSI). More specifically, we derive the unified expressions for probability density function (PDF) and cumulative distribution function (CDF) of instantaneous signal to noise ratio (SNR) over EW turbulent FSO link along with pointing error and path loss. We then utilize the unified statistics in obtaining the outage probability expression for the considered network. It is shown by analytical and simulation results that the relay selection protocol based on partial CSI completely outperforms the single relay selection protocol for both detection techniques.

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