Abstract
This letter proposes and evaluates the performance of reconfigurable intelligent surface (RIS)-equipped source mixed radio frequency (RF)/free space optical (FSO) relay network with opportunistic RF source 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, the system is studied at the high signal-to-noise ratio (SNR) regime, where the diversity order and coding gain are provided. Results illustrate that at high SNR values, the system performance is dominated by the worst hop and the diversity order is equal to G <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">d</sub> =min(KN,α,β,ζ <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> ), where K is the number of RF sources, N is the number of reflecting elements at each source, α and β are the atmospheric turbulence parameters of the FSO link, and ζ <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> is a measure for the alignment quality of the FSO source and receiver. In addition, findings show that for the same G <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">d</sub> , N is more impactful on the performance than K through the coding gain G <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> . Furthermore, the RIS-equipped source scenario where RIS is internally implemented in RF sources is shown to outperform the RIS-aided scenario where RIS is used as relay in terms of both G <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">d</sub> and G <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> .
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
