Research on the Self-Adaptive Opportunistic-and-Forward Scheme Based on Feedback
LI En-y · Beijing Youdian Xueyuan xuebao · 2015
In order to improve the performance of the multi-relay system in the case that two sources exchange information with each other,a self-adaptive opportunistic-and-forward scheme is proposed. Based on the feedback transmitted by these two sources,the optimal transmission mode is selected from these four ways: direct transmission,direct retransmission,one-way opportunistic relaying transmission and two-way opportunistic relaying transmission in the proposed scheme. When only one source decoded the received signal correctly,a competition between the source retransmission and one-way opportunistic relaying is adopted. Due to the optimum transmission mode being selected adaptively,so compared to other transmission methods,this proposed scheme can reduce transmission complexity greatly and improve outage performance and spectral efficiency. At last,the superiority of the proposed scheme is verified by theoretical analysis and numerical simulations.