Optimization for multi-relay selection with rateless code in cooperative communication system

In this paper, a joint relay selection scheme with rateless codes is considered for the three-stage transmission scenario with one source, multi-relay and one destination, where all nodes employ rateless codes when transmitting system information. During the transmission process, the source keeps sending messages until it receives enough ACK feedbacks from relays or the destination. The relays that finish decoding more quickly can participate in the transmission the moment it succeeds and help the other relays and the destination to accumulate more packets. As we introduce the communication among the relays, an increase of throughput can be obtained owing to the reduction of transmission time. It's also shown by simulations that the proposed schemes can gain a better performance, not only for system throughput, but also for energy consumption, which achieves more flexible tradeoff between system throughput and energy consumption.