反馈判断的自适应机会转发策略  

Research on the Self-Adaptive Opportunistic-and-Forward Scheme Based on Feedback

作　　者：李恩玉[1] 董云泉[1] 宋传旺[1] 李言胜[1] 

机构地区：[1]青岛理工大学通信与电子工程学院,青岛266520

出　　处：《北京邮电大学学报》2015年第3期61-65,70,共6页Journal of Beijing University of Posts and Telecommunications

基　　金：山东省自然科学基金资助项目(ZR2014FQ012;ZR2010FM011);国家"十二五"科技支撑项目(2014BAK12B06)

摘　　要：为了提高多中继系统下俩源节点进行数据交换时的性能,提出了自适应机会转发策略.在该策略中,根据2个源节点反馈控制帧的情况,从直接传输、直接重传、单向机会中继传输和双向机会中继传输4种传输模式中选择最优的传输模式.在只有1个源节点能解码时,采用源节点重传和单向机会中继竞争的方式.由于该策略能自适应地选择最优的传输模式,因此相比较其他转发策略,可以较大地降低系统数据交换的复杂度,提高系统的中断性能和频谱效率.最后,通过理论分析和数值仿真验证了该策略的优越性.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.

关 键 词：协同通信 中继选择 双向中继 中断概率 瑞利衰落 

分 类 号：TN929.53[电子电信—通信与信息系统]