Adaptive power allocation for wireless cooperative communications

In power-limited cooperative communication systems, power allocation is a key issue to maintain the quality of communications with limited power supply. In this paper, we propose an adaptive power allocation scheme based on the mixed channel state information including the instantaneous channel state information of the channels between source node and the other nodes, also the statistical channel state information of the channels between relay nodes and destination node. In the proposed scheme, the source node near-optimally allocates power and selects the relays to optimize the outage performance. A simplified scheme is also proposed for practical utilization by considering less cases without significantly performance loss. Numerical results suggest that both the proposed adaptive scheme and its simplified version can offer better communication performance.