Selection based inter-relay power allocation for multiple AF single-antenna relays
School of Electrical Engineering, Seoul National University, Seoul, Korea
EURASIP Journal on Wireless Communications and Networking 2012, 2012:183 doi:10.1186/1687-1499-2012-183Published: 30 May 2012
This article deals with inter-relay power allocation for multiple-input multiple-output systems with multiple single-antenna relays. It is difficult to derive an optimal solution in a closed form for the case of multiple multi-antenna relays as well as the case of multiple single-antenna relays. In this article, we propose an approximate solution which is effective only for the case of multiple single-antenna relays. A key contribution of this article is a low complexity inter-relay power allocation method which is based on relay selection. This approach also reduces the feedback information of the gain factors of all the relays. An incremental greedy search algorithm is also proposed to further reduce the complexity of the relay selection process with negligible performance degradation. Simulations indicate that the performance is comparable to the optimal exhaustive search algorithm.