A Cooperative Transmission Scheme Based on Amplify and Forward in Cognitive Radio Networks
Chu Yu-zhi Zheng Bao-yu
(Institute of Signal Processing and Transmission, Nanjing University of Posts and Telecommunications, Nanjing 210003, China)
(Broadband Wireless Communication and Sensor Network Technology Ministry of Education,Nanjing University of Posts & Telecommunications, Nanjing 210003, China)
Abstract:Cognitive Radio Networks (CRNs) improve Secondary Users’ (SUs) transmission performance through cooperative transmission between SUs without interfering the regular transmissions of the Primary Users (PU). In this paper, a new cooperative transmission scheme is proposed based on AF (Amplify and Forward) protocol while PU and SUs coexist in the same CRN and each PU can be either active (ON) or inactive (OFF) in any given slot. When the licensed frequency is occupied by the PU, SU can opportunist use the relay to transmit signals. Analytical expression of the non-interference transmission durations is given. Non-cooperative and cooperative schemes derived show the effect of cooperative transmission on the non-interference transmission durations performance. Besides, numerical experiments are conducted to verify the effectiveness of the proposed cooperative schemes. The increase of non-interference transmission durations by cooperative transmission confirms the advantages of the new scheme.
褚御芝, 郑宝玉. 认知无线网络中一种基于放大转发的协作传输策略[J]. 电子与信息学报, 2011, 33(3): 509-514.
Chu Yu-Zhi, Zheng Bao-Yu. A Cooperative Transmission Scheme Based on Amplify and Forward in Cognitive Radio Networks. , 2011, 33(3): 509-514.