DocumentCode :
1715173
Title :
Performance of decode-and-forward opportunistic cooperation with channel estimation errors
Author :
Yang, Changqing ; Wang, Wenbo ; Zhao, Shuang ; Peng, Mugen
Author_Institution :
Key Lab. of Universal Wireless Commun., Beijing Univ. of Posts & Telecommun., Beijing, China
fYear :
2010
Firstpage :
1967
Lastpage :
1971
Abstract :
In this paper, we investigate the outage performance of decode-and-forward (DF) based opportunistic cooperative communications with channel estimation errors at the receivers under Rayleigh fading channels, in which the effect of the direct link has been explicitly evaluated. To be specific, the exact expression of outage probability has been derived for arbitrary values of signal-to-noise ratio (SNR) when pilot power is fixed. Through asymptotic analysis, the closed-form expressions of outage probability in the high SNR region and the diversity order are obtained. The analysis shows that the channel estimation errors due to limited pilot power impose a significant impact on the outage performance, leading to the diversity order be 0 even when the direct link is available. Although deploying more relays can mitigate the estimation errors effectively, the performance limit caused by the estimation errors becomes more obvious as SNR grows. For specific pilot power configuration and relay deployment, the outage probability remains unchanged even if data power approaches to infinity. Furthermore, simulation results are presented to verify our analysis.
Keywords :
Rayleigh channels; channel estimation; cooperative communication; decode and forward communication; probability; Rayleigh fading channels; channel estimation errors; decode-and-forward opportunistic cooperation; diversity order; outage probability; pilot power configuration; signal-to-noise ratio; Channel estimation; Fading; Protocols; Random variables; Relays; Signal to noise ratio;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Personal Indoor and Mobile Radio Communications (PIMRC), 2010 IEEE 21st International Symposium on
Conference_Location :
Instanbul
Print_ISBN :
978-1-4244-8017-3
Type :
conf
DOI :
10.1109/PIMRC.2010.5671602
Filename :
5671602
Link To Document :
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