Directional Relays for Multi-Hop Cooperative Cognitive Radio Networks
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Date
2013-09
Authors
Nouri, Narges
Noori, Narges
ORCID
Advisor
Referee
Mark
Journal Title
Journal ISSN
Volume Title
Publisher
Společnost pro radioelektronické inženýrství
Abstract
In this paper, we investigate power allocation and beamforming in a relay assisted cognitive radio (CR) network. Our objective is to maximize the performance of the CR network while limiting interference in the direction of the primary users (PUs). In order to achieve these goals, we first consider joint power allocation and beamforming for cognitive nodes in direct links. Then, we propose an optimal power allocation strategy for relay nodes in indirect transmissions. Unlike the conventional cooperative relaying networks, the applied relays are equipped with directional antennas to further reduce the interference to PUs and meet the CR network requirements. The proposed approach employs genetic algorithm (GA) to solve the optimization problems. Numerical simulation results illustrate the quality of service (QoS) satisfaction in both primary and secondary networks. These results also show that notable improvements are achieved in the system performance if the conventional omni-directional relays are replaced with directional ones.
Description
Citation
Radioengineering. 2013, vol. 22, č. 3, s. 791-799. issn 1210-2512
http://www.radioeng.cz/fulltexts/2013/13_03_0791_0799.pdf
http://www.radioeng.cz/fulltexts/2013/13_03_0791_0799.pdf
Document type
Peer-reviewed
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Language of document
en