Full-Duplex Relay Selection in Cognitive Underlay Networks

Type
Article

Authors
Khafagy, Mohammad Galal
Alouini, Mohamed-Slim
Aissa, Sonia

KAUST Department
Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
Electrical Engineering Program

Preprint Posting Date
2017-09-30

Online Publication Date
2018-05-25

Print Publication Date
2018

Date
2018-05-25

Abstract
We analyze the outage and throughput performance of full-duplex relay selection (FDRS) in underlay cognitive networks. Contrary to half-duplex relaying, full-duplex relaying (FDR) enables simultaneous listening/forwarding at the secondary relay(s), thereby allowing for higher spectral efficiency. However, due to simultaneous source/relay transmissions in FDR, the superimposed signal at the primary receiver should now satisfy the existing interference constraint, which can considerably limit the secondary network throughput. In this regard, FDRS can offer an adequate solution to boost the secondary throughput while satisfying the imposed interference limit. We first analyze the performance of opportunistic FDRS with residual selfinterference (RSI) by deriving the exact cumulative distribution function of its end-to-end signal-to-interference-plus-noise ratio under Nakagami-m fading. We also evaluate the offered diversity gain of relay selection for different full-duplex cooperation schemes in the presence/absence of a direct source-destination link under Rayleigh fading. When the RSI link gain model is sublinear in the relay power, which agrees with recent research findings, we show that remarkable diversity can be recovered even in the presence of an interfering direct link. Second, we evaluate the end-to-end performance of FDRS with interference constraints due to the presence of a primary receiver. Finally, the presented theoretical findings are verified by numerical simulations.

Citation
Khafagy MG, Alouini M-S, Aissa S (2018) Full-Duplex Relay Selection in Cognitive Underlay Networks. IEEE Transactions on Communications: 1–1. Available: http://dx.doi.org/10.1109/TCOMM.2018.2840705.

Acknowledgements
The research reported in this publication is supported by funding from King Abdullah University of Science and Technology (KAUST).

Publisher
Institute of Electrical and Electronics Engineers (IEEE)

Journal
IEEE Transactions on Communications

DOI
10.1109/TCOMM.2018.2840705

arXiv
1710.00177

Additional Links
https://ieeexplore.ieee.org/document/8365761/

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