Performance analysis and power allocation for two-way multi-user mixed RF/FSO relay networks

Yasser F. Al-Eryani, Anas M. Salhab, Salam A. Zummo, Mohamed-Slim Alouini

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Scopus citations


This paper studies the performance of two-way multiuser mixed radio frequency/free space optical (RF/FSO) relay networks with opportunistic user scheduling and asymmetric fading channels. The considered system consists of multiple users communicating with a destination node through a decode-and forward (DF) relay in a two-way fashion. The links between the users and relay are assumed to be Rayleigh distributed RF channels, while the link between the relay and destination is Gamma-Gamma fading FSO channel. First, exact closed-form and asymptotic (high signal-to-noise ratio (SNR)) expressions are derived for the outage probability. Then, the asymptotic results are used to conduct a power optimization algorithm where exact expressions for the optimal transmission powers are provided. Additionally, performance comparisons between the considered two-way relaying (TWR) and one-way relaying (OWR) schemes under different network parameters are provided and discussed. The results show that the opportunistic user scheduling in TWR networks does not affect the network diversity order, but it enhances the system coding gain. Additionally, it is found that severe pointing error may result in a total service blockage. Additionally, the proposed power allocation scheme is found to enhance the network outage performance significantly compared to the scheme of equal power allocation.
Original languageEnglish (US)
Title of host publication2018 IEEE Wireless Communications and Networking Conference (WCNC)
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Number of pages6
ISBN (Print)9781538617342
StatePublished - Jun 11 2018

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was funded by the National Plan for Science, Technology and Innovation (Maarifah)-King Abdulaziz City for Science and Technology-through the Science and Technology Unit at King Fahd University of Petroleum & Minerals (KFUPM), KSA, under grant number 15-ELE4157-04. The work was also supported by the Deanship of Scientific Research in KFUPM through grant number IN161023. The authors would like also to acknowledge the KFUPM-KAUST research initiative resulted from this research work.


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