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| A Distributed Power Allocation for Cooperative Transmission in Cognitive Radio Systems |
| Guo Yan-yan①② Kang Gui-xia① Zhang Ning-bo① Zhang Ping① |
①(Key Laboratory of Universal Wireless Communication, Beijing University of Posts and Telecommunications, Ministry of Education, Beijing 100876, China)
②(School of Physics and Electronics Engineering ShaXi University, Taiyuan 030006, China) |
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Abstract The cooperative communication can get better performance of systems than the direct transmission. In particular, how to manage cooperative relays and allocate power among them especially for Cognitive Radio (CR) is one of the most important issue in wireless cooperative diversity systems. For CR systems, cooperative power allocation strategy need consider avoiding the interference with the primary (licensed) users. In this paper, a distributed transmit power allocation algorithm for multi-relays based on Amplify and Forward (AF) cooperative transmission is proposed for spectrum sharing CR systems. It optimizes the performance of the CR system, while the interference experienced by the licensed users is limited. The simulations validate the effectiveness of proposed algorithm by comparing it with the direct transmission and the scheme where equal weights are assigned to the relays.
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Received: 03 July 2009
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Corresponding Authors:
Guo Yan-yan
E-mail: luegyy@163.com
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2010, Vol. 32 
