Information-Guided Relay Selection for High Throughput in Half-Duplex Relay Channels

In this paper, we consider the relay selection problem for the cooperative transmission in wireless networks with multiple half-duplex relay nodes. In the existing scheme, by using multiple relay nodes, spatial diversity is exploited to improve the transmission reliability. However, only one relay node is active in each relay-help transmission. We propose a novel relay selection scheme to improve relay throughput by selecting more than one relay nodes in the relay-help transmission and using the selection of active relay nodes to map a portion of information to be relayed. In the proposed scheme, extra relayed information can be forwarded besides the basic relayed information transmitted traditionally, and moreover, iterative decoding can be used to achieve robust detection. Especially, we show the efficiency of the proposed scheme by analyzing its capacity performance and comparing with that of the existing scheme.