Energy-aware cooperative wireless networks with multiple cognitive users

Ashour, M., Butt, M. M. , Mohamed, A., ElBatt, T. and Kunz, M. (2016) Energy-aware cooperative wireless networks with multiple cognitive users. IEEE Transactions on Communications, 64(8), pp. 3233-3245. (doi:10.1109/TCOMM.2016.2581814)

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Abstract

In this paper, we study and analyze cooperative cognitive radio networks with arbitrary number of secondary users (SUs). Each SU is considered a prospective relay for the primary user (PU) besides having its own data transmission demand. We consider a multi-packet transmission framework that allows multiple SUs to transmit simultaneously because of dirty-paper coding. We propose power allocation and scheduling policies that optimize the throughput for both PU and SU with minimum energy expenditure. The performance of the system is evaluated in terms of throughput and delay under different opportunistic relay selection policies. Toward this objective, we present a mathematical framework for deriving stability conditions for all queues in the system. Consequently, the throughput of both primary and secondary links is quantified. Furthermore, a moment generating function approach is employed to derive a closed-form expression for the average delay encountered by the PU packets. Results reveal that we achieve better performance in terms of throughput and delay at lower energy cost as compared with equal power allocation schemes proposed earlier in the literature. Extensive simulations are conducted to validate our theoretical findings.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Butt, Dr Muhammad Majid
Authors: Ashour, M., Butt, M. M., Mohamed, A., ElBatt, T., and Kunz, M.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:IEEE Transactions on Communications
Publisher:IEEE
ISSN:0090-6778
ISSN (Online):1558-0857
Published Online:16 June 2016
Copyright Holders:Copyright © 2016 IEEE
First Published:First published in IEEE Transactions on Communications 64(8): 3233-3245
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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