An Improved Relay Selection Scheme in Half-Duplex Relay Channels

In this paper, a novel relay selection scheme is proposed for the wireless network with multiple half-duplex relay nodes, which improves relay throughput by selecting more than one relay nodes in each relay-help transmission and using the selection of active relay nodes to map a portion of information to be relayed. Compared with the existing relay selection scheme with only one active relay node in each relay-help transmission, the proposed scheme allows extra relayed information to be forwarded besides the basic relayed information transmitted traditionally. And, the efficiency of the proposed scheme is shown by the analysis of capacity behaviors.