A Cooperative Diversity Protocol with Incremental Selection and Amplify Forward Opportunistic Relaying
Xuewen Liao · Xi'an Jiaotong Daxue xuebao · 2010
An improved cooperative diversity protocol named incremental selection amplify forward opportunistic relaying(ISAFOR)is proposed to improve the noise amplification problem in amplify-forward protocol.The new scheme first chooses the best relay among relays.The destination sends three types of feedback when it receives the information which is sent from the source node in the first step.The three types of feedback are success,half-success and failure.Then the protocol will work with 3 transmissions:non-cooperative transmission,retransmission and amplify forwarding.It is the retransmission by the source that the new protocol reduces the times of amplify-forwarding and the noise amplification.Theoretical analysis,simulation results and comparisons with the incremental amplify forward opportunistic relaying show that when the number of relays is 4 and the outage probability is 10-3,the proposed protocol achieves about 0.4dB signal to noise ratio gain and obtains the same diversity-multiplexing as ideal distributed space-time code.