Power allocation system based on maximizing expectant SNR in cooperative communication

Cooperative communication is a new spatial diversity technology,while power allocation technology directly affects its efficiency and reliability. Focusing on this problem,this paper presents a distributed space-time coding cooperative system under amplify-and-forward(AF)transfer mode,then it discusses on a power allocation strategy ground on maximizing expectant signal to noise ratio(SNR).The performance of cooperative communication system based on this frame is analyzed.It finds that this performance is identical with cooperative communication system using full diversity distributed space-time code.