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Mixing RIS-Assisted Sources with FSO Link
Anas M. Salhab, Liang Yang · 2020-11-11 · via cs.IT updates on arXiv.org

This letter proposes and evaluates the performance of reconfigurable intelligent surface (RIS)-assisted source multiuser mixed radio frequency (RF)/free space optical (FSO) relay network with opportunistic user scheduling. Closed-form analytical approximations are derived for the outage probability and average symbol error probability (ASEP) assuming Rayleigh and Gamma-Gamma fading models for the RF and FSO channels, respectively. Moreover, to gain more insight into the system behavior, the system is studied at the high signal-to-noise ratio (SNR) regime whereby the diversity order and coding gain are derived and analyzed. The results illustrate that the system performance is dominated by the worst hop and that the diversity order is equal to Gd = min(KN,alpha,beta,zeta^2), where K is the number of RF users, N is the number of reflecting elements at each user, alpha and beta are the atmospheric turbulence parameters of the FSO link, and zeta^2 is a measure for the alignment quality of the FSO link. In addition, findings show that for the same diversity order, N is more impactful on the system performance than K through the coding gain Gc.

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