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Partial relay selection in mixed RF/FSO dual-hop system over unified M-distributed fading channel with non-zero boresight pointing errors

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Abstract

In this paper, the performance of a partial relay selection-based amplify-and-forward mixed radio frequency/free space optical (RF/FSO) system with a direct RF link and outdated channel state information (CSI) is presented. The source-to-relay and source-to-destination RF links are subjected to Rayleigh distributions while the relay-to-destination FSO link experiences Malaga (M)-distribution with generalized non-zero boresight pointing errors. It is also assumed that selection combining diversity with heterodyne detection is considered for the signal reception at the destination. Moreover, the cumulative distribution functions of the end-to-end signal-to-noise under the influence of with/or without a direct link are then derived for the concerned system. Through this, the closed-form expressions for the system outage probability and average bit error rate are obtained. Thus, the influence of atmospheric turbulence, outdated CSI and relay selection are evaluated for the system under zero boresight and non-zero boresight displacement pointing errors scenarios. The results illustrated that the mixed RF/FSO system with a direct link offers better performance than the one without a direct link. The accuracy of the presented results is validated by Monte-Carlo simulation.

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Authors and Affiliations

  1. Department of Electronic Engineering, Howard College, University of KwaZulu-Natal, Durban, 4041, South Africa

    Kehinde O. Odeyemi

  2. Department of Computer Systems Engineering, Tshwane University of Technology, Pretoria, 0001, South Africa

    Pius A. Owolawi

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  1. Kehinde O. Odeyemi
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  2. Pius A. Owolawi
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Correspondence to Kehinde O. Odeyemi.

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Odeyemi, K.O., Owolawi, P.A. Partial relay selection in mixed RF/FSO dual-hop system over unified M-distributed fading channel with non-zero boresight pointing errors. Opt Quant Electron 51, 141 (2019). https://doi.org/10.1007/s11082-019-1863-3

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