摘要
针对过时CSI放大转发协作网络数据传输和中继选择过程中信道信息不一致问题,提出了一种门限判决中继选择算法.该算法首先在目的节点处设置信噪比门限值,将第二跳链路过时瞬时信噪比大于门限值的中继加入候选中继集合;其次综合考虑了直传链路平均过时信噪比,第一跳链路平均过时信噪比乘积;最后根据最佳门限判决中继选择策略选择最优中继.数值仿真结果表明,提出的算法在完美CSI情况下比不完美CSI情况下大约有2dB性能优势,对于不完美CSI情况下提出的算法比已有的算法大约有1dB性能优势,提出的算法明显地提高了系统性能.
Aiming at channel information inconsistency in data transmission and relay selection of outdated CSI amplification and forwarding cooperative networks,we propose a relay selection algorithm with threshold decision.Firstly,the SNR threshold is set at the destination node and the relay-destination links with outdated instantaneous SNRs larger than the threshold value are added into the candidate relay set.Secondly,Considering the average outdated signal-to-noise ratio of direct link and the average outdated signal-to-noise ratio product of the first hop lin k,the optimal relay selection strategy is selected according to the optimal threshold decision.The numerical simulation results show that the proposed algorithm has about 2 dB performance advantages over the imperfect CSI,and about 1 dB performance advantages over the existing algorithms under the imperfect CSI.The proposed algorithm significantly improves the system performance.
作者
陈平
李攀
李丹丹
CHEN Ping;LI Pan;LI Dandan(Department of Information Engineering,Jiyuan Vocational and Technical College,Jiyuan Henan 459000;China Unicom Henan Sanmenxia branch,Sanmenxia Henan 472000)
出处
《宁夏师范学院学报》
2019年第1期78-84,91,共8页
Journal of Ningxia Normal University
基金
河南省科技攻关项目(172102210606)
河南省高等学校重点科研项目(17B520040)
关键词
协作通信
中继选择
门限判决
信道状态信息
信噪比
Cooperative communication
Relay selection
Threshold decision
Channel state information
Signal to noise ratio
