DocumentCode :
1487470
Title :
End-to-End Performance of Cooperative Relaying in Spectrum-Sharing Systems With Quality of Service Requirements
Author :
Asghari, Vahid ; Aïssa, Sonia
Author_Institution :
Inst. Nat. de la Rech. Sci. (INRS), Univ. of Quebec, Montreal, QC, Canada
Volume :
60
Issue :
6
fYear :
2011
fDate :
7/1/2011 12:00:00 AM
Firstpage :
2656
Lastpage :
2668
Abstract :
We propose adopting a cooperative relaying technique in spectrum-sharing cognitive radio (CR) systems to more effectively and efficiently utilize available transmission resources, such as power, rate, and bandwidth, while adhering to the quality of service (QoS) requirements of the licensed (primary) users of the shared spectrum band. In particular, we first consider that the cognitive (secondary) user´s communication is assisted by an intermediate relay that implements the decode-and-forward (DF) technique onto the secondary user´s relayed signal to help with communication between the corresponding source and the destination nodes. In this context, we obtain first-order statistics pertaining to the first- and second-hop transmission channels, and then, we investigate the end-to-end performance of the proposed spectrum-sharing cooperative relaying system under resource constraints defined to assure that the primary QoS is unaffected. Specifically, we investigate the overall average bit error rate (BER), ergodic capacity, and outage probability of the secondary´s communication subject to appropriate constraints on the interference power at the primary receivers. We then consider a general scenario where a cluster of relays is available between the secondary source and destination nodes. In this case, making use of the partial relay selection method, we generalize our results for the single-relay scheme and obtain the end-to-end performance of the cooperative spectrum-sharing system with a cluster of L available relays. Finally, we examine our theoretical results through simulations and comparisons, illustrating the overall performance of the proposed spectrum-sharing cooperative system and quantify its advantages for different operating scenarios and conditions.
Keywords :
cognitive radio; cooperative communication; decode and forward communication; error statistics; interference suppression; probability; quality of service; radio receivers; radiofrequency interference; relays; wireless channels; BER; DF technique; QoS requirement; bit error rate; cooperative relaying technique; decode-and-forward technique; end-to-end performance; ergodic capacity; first-hop transmission channel; first-order statistic; interference; intermediate relay; outage probability; partial relay selection method; quality of service requirement; radio receiver; relays cluster; resource constraint; second-hop transmission channel; single-relay scheme; spectrum-sharing CR system; spectrum-sharing cognitive radio system; Bit error rate; Cooperative systems; Interference; Quality of service; Receivers; Relays; Signal to noise ratio; Clustered setting; cognitive radio (CR); cooperative relaying; relay selection; spectrum sharing;
fLanguage :
English
Journal_Title :
Vehicular Technology, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9545
Type :
jour
DOI :
10.1109/TVT.2011.2136391
Filename :
5741879
Link To Document :
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