LIU Shuai, SUN Dechun, LIU Zujun, YI Kechu, YANG Hong, WANG Kan. Outage Performance of Cognitive AF Relay Networks with Imperfect CSI Based on Geometrical Analysis[J]. Chinese Journal of Electronics, 2017, 26(5): 1048-1056. doi: 10.1049/cje.2017.04.008
Citation: LIU Shuai, SUN Dechun, LIU Zujun, YI Kechu, YANG Hong, WANG Kan. Outage Performance of Cognitive AF Relay Networks with Imperfect CSI Based on Geometrical Analysis[J]. Chinese Journal of Electronics, 2017, 26(5): 1048-1056. doi: 10.1049/cje.2017.04.008

Outage Performance of Cognitive AF Relay Networks with Imperfect CSI Based on Geometrical Analysis

doi: 10.1049/cje.2017.04.008
Funds:  This work is supported by the National Natural Science Foundation of China (No.61301170, No.61571340), the Fundamental Research Funds for the Central Universities (No.JB150109), and the 111 Project (No.B08038).
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  • Corresponding author: SUN Dechun (corresponding author) was born in Henan Province, China, in 1982. He received the B.S., M.S. and Ph.D. degrees from Xidian University, Xi'an, China, in 2003, 2006 and 2012 respectively, all in telecommunications engineering. Since then, he has been in the department of telecommunications engineering, Xidian University, Xi'an, China, where he is currently an Assistant Professor. His research interests include signal processing, wireless communications, and satellite communications. (Email:dcsun@mail.xidian.edu.cn)
  • Received Date: 2015-11-09
  • Rev Recd Date: 2016-03-29
  • Publish Date: 2017-09-10
  • This paper studies the outage performance of a cognitive Amplify-and-forward (AF) relay network subject to Rayleigh fading. Under the condition of imperfect Channel state information (CSI) estimations of the links from the secondary system to the Primary user (PU), the closed-form upper and lower bounds of the outage probability are derived through a geometrical analysis method. An asymptotic analysis of the outage probability is also derived in the high Signal-to-noise ratio (SNR) regime to gain additional insights on the system. The simulation results corroborate our theoretical analysis, and the effectiveness of the geometrical analysis method is verified with the conventional approach as a benchmark. The asymptotic results are very tight with the analytical lower bound in the high SNR regime. It also can be observed from the simulation results that the impact of the number of relays as well as the imperfect CSI on the outage probability and the diversity order.
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