A multi-relay selection scheme in the DF cooperative network composed of the battery-operated relays

摘要

Classical opportunistic relay selections always cause unequal power consumption among all relays. For the battery-operated relays in the cooperative networks, uneven power consumption among the relays may reduce the network lifetime and thus deteriorates the network performance. In this paper, a novel multi-relay selection scheme aiming at the increase of the network lifetime is proposed for the decode-and-forward cooperative networks consisting of the battery-operated relays only. In the proposed scheme, the potential relay subset and the candidate relay subset are established successively. The channel status information of the relaying links, the transmitting power of each relay allocated by the waterfilling solution, and the residual energy in the battery of each relay are considered in the proposed scheme. Simulation results show that the proposed scheme can not only prolong the average lifetime of networks but also achieve a larger average channel capacity, compared to the existing scheme in the literature.