Multi-relay selection scheme based on quantum particle swarm optimization in relay networks

Multi-relay selection scheme for cooperative relaying considering the signal to noise ratio (SNR) maximization and power efficiency optimization is proposed in this paper. In cooperative relay networks, the selected relay nodes have great impact on the system performance. It is an optimization problem for best cooperative relay node number and which relay nodes are selected. The exhaustive search can solve this problem but the complexity will increase exponentially with the network size, i.e., the number of relays in the network. This paper proposes two novel quantum particle swarm optimization (QPSO) based relay selection schemes with the SNR optimization target and power efficiency target respectively. Simulation results show that the QPSO-based multi-relay selection scheme has the ability to search global optimal solution compared with other multi-relay selection algorithm in literature.