|
|
A Statistic Channel Information-Based Relay Selection Scheme |
Wu Su-wen; Lü Xing-zai; Zhu Jin-kang;Deng Dan |
PCN&SS Lab, University of Science and Technology of China, Hefei 230027, China |
|
|
Abstract In this paper, a statistic channel information-based relay selection scheme is proposed in non-regenerative cooperative networks. Firstly, a parameter named equivalent channel gain is defined based on the statistic channel information under the equal power allocation constraint. It describes the compositive channel character of two phases in the cooperative process. Then an optimal relay selection scheme is proposed based on the descend order of equivalent channel gain. The scheme implies that different relay nodes should be selected to minimize the outage probability under different SNR ranges. And the analysis shows that the diversity order of the relay selection scheme is, N+1 where N is the number of the relay node in the system. The numerical results show that the outage probability of the proposed scheme is lower than the other schemes. Moreover, a suboptimal relay selection scheme with power allocation is considered. The outage performance of the suboptimal scheme is nearly the same as the optimal exhaust search scheme while the complexity is reduced.
|
Received: 24 March 2008
|
|
|
|
|
|
|
|