DocumentCode :
82222
Title :
Outage Performance Study of Cognitive Relay Networks with Imperfect Channel Knowledge
Author :
Xing Zhang ; Jia Xing ; Zhi Yan ; Yue Gao ; Wenbo Wang
Author_Institution :
Sch. of Inf. & Commun. Eng., Beijing Univ. of Posts & Telecommun., Beijing, China
Volume :
17
Issue :
1
fYear :
2013
fDate :
Jan-13
Firstpage :
27
Lastpage :
30
Abstract :
This letter presents the outage performance analysis for a cognitive relay network (CRN) with imperfect channel knowledge estimations. Under the condition of imperfect channel state information (CSI) estimations of interference links between primary and secondary systems, especially the links from both secondary transmitter and secondary relays to primary users, the exact outage probability is derived over Rayleigh fading channels and is verified through simulations. The simulation results show that: 1) increasing the number of relays is an effective approach to mitigate the outage performance degradation caused by the imperfect CSI; 2) the imperfect CSI of the secondary transmitter-primary user (PU) link has a greater impact on the outage performance than that of the secondary relay-PU link.
Keywords :
Rayleigh channels; cognitive radio; probability; radiofrequency interference; relay networks (telecommunication); CRN; Rayleigh fading channels; cognitive relay networks; exact outage probability; imperfect CSI estimation; imperfect channel knowledge estimation; imperfect channel state information estimations; interference links; outage performance analysis; primary systems; secondary relay-PU link; secondary systems; secondary transmitter-primary user link; Channel estimation; Estimation; Fading; Interference; Knowledge engineering; Relays; Signal to noise ratio; Cognitive relay networks; imperfect channel knowledge; outage performance;
fLanguage :
English
Journal_Title :
Communications Letters, IEEE
Publisher :
ieee
ISSN :
1089-7798
Type :
jour
DOI :
10.1109/LCOMM.2012.112812.121371
Filename :
6365871
Link To Document :
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