Relay selection schemes for SWIPT-enabled cooperative wireless networks with partial CSI

This study investigates the problem of relay selection in a cooperative network with Nakagami-m fading channels, where the energy of the relays is solely replenished by simultaneous wireless information and power transfer (SWIPT). Two efficient relay selection algorithms which require partial channel state information (CSI) at the source are proposed. The first scheme selects a relay based on the fading channel qualities of the source-relay and the relay-destination. The second one selects a relay based on the harvested power at relay and the fading channel quality of the relay-destination. In terms of coverage probability, the latter scheme is superior and is shown to have a performance close to that of the optimal relay selection scheme. Furthermore, the analytical performance bounds for the two proposed schemes are formulated. The performance analysis along with the simulation results are presented, demonstrating the superiority of the proposed schemes over the existing algorithms.