Adaptive Power Allocation with Relay Selection for Decode-and-Forward Relay System Based on Genetic Algorithm

In this paper, we consider a dual-hop wireless multirelay system with decode-and-forward (DF) cooperative protocol. Assuming the knowledge of channel gain magnitudes, we explore adaptive power allocation based on genetic algorithm with a simple opportunistic relay selection strategy to minimize the system outage probability under an aggregate power constraint. Simulation results show that the presented optimal power allocation significantly enhances system performance. Moreover, it is also found that more candidate relays will decrease system outage probability even the relays do not actively transmit.