naa a22 4500 510795315 CHVBK 20180411083334.0 cr unu---uuuuu 180411e20130301xx s 000 0 eng 10.1007/s11277-012-0618-2 doi (NATIONALLICENCE)springer-10.1007/s11277-012-0618-2 Outage Performance and Cooperative Diversity Under Amplify and Forward Relaying in Cognitive Radio Networks [Elektronische Daten] [Qian Wang, Dian-Wu Yue, Francis Lau] This paper investigates the outage and diversity performance in a cognitive radio (CR) network, in which data are transmitted through amplify-and-forward protocol. A fixed CR node is selected as relay to combat fading effect. The CR user transmits or relays data when the result of cooperative spectrum sensing indicates that primary user (PU) channel is free and the relay node stops performing the protocol as soon as the PU is detected to be active. A closed-form expression of outage probability for the CR network is calculated based on which diversity order is derived. The results show that the proposed scheme suffers a loss in diversity order. To compensate for this loss, a repetition-based scheme is proposed in a delay-insensitive system at the cost of the challenge in implementation. In this case, we evaluate the outage performance and the average transmit duration and then compare them with the ones in the delay-sensitive system. Asymptotic analysis is also presented to show the outage performance advantage of using a relay over the one without using it. The numerical results presented in the paper verify our analysis. Springer Science+Business Media, LLC., 2012 Outage probability nationallicence Cooperative diversity nationallicence Cognitive radio networks nationallicence Amplify-and-forward protocol nationallicence Cooperative spectrum sensing nationallicence Energy detection nationallicence Wang Qian Department of Electrical and Computer Systems Engineering, Monash University, Melbourne, Australia aut Yue Dian-Wu College of Information Science and Technology, Dalian Maritime University, Dalian, China aut Lau Francis Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong aut Wireless Personal Communications Springer US; http://www.springer-ny.com 69/2(2013-03-01), 891-914 0929-6212 69:2<891 2013 69 11277 https://doi.org/10.1007/s11277-012-0618-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-012-0618-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wang Qian Department of Electrical and Computer Systems Engineering, Monash University, Melbourne, Australia aut NATIONALLICENCE 700 1- Yue Dian-Wu College of Information Science and Technology, Dalian Maritime University, Dalian, China aut NATIONALLICENCE 700 1- Lau Francis Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 69/2(2013-03-01), 891-914 0929-6212 69:2<891 2013 69 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer