收稿日期: 2017-08-25
修回日期: 2017-10-03
网络出版日期: 2018-05-31
基金资助
国家自然科学基金（No.61471031，No.61661021）；东南大学移动通信国家重点实验室开放研究基金（No.2017D14）；轨道交通控制与安全国家重点实验室开放课题基金（No.RCS2017K009）；江西省交通厅科研项目基金（No.2016D0037）；江西省主要学科学术和技术带头人资助计划项目基金（No.20172BCB22016）；江西省重点研发计划项目基金（No.20171BBE50057）资助
Reliability of D2D System Related to Distance in Rayleigh Fading Channel
Received date: 2017-08-25
Revised date: 2017-10-03
Online published: 2018-05-31
在基站的控制下，设备到设备（device-to-device，D2D）通信双方可直接进行通信而不需要经过基站的转发.为了改善系统容量、增大系统可靠性、提高分集增益，在D2D通信系统中引入了中继技术，其中所采用的中继策略包括放大转发模式和译码转发模式.考虑到中继位置对系统可靠性的影响，该文创造性地建立了距离模型，并在瑞利衰落信道条件下，推导出不同模式下系统的中断概率公式.由仿真分析可知：当系统信道目标速率较低时，使用中继技术可有效降低中断概率，且当中继节点越靠近D2D通信用户对的中点时，中断概率越低；相比于无中继的D2D通信系统，采用中继技术的D2D通信系统拥有更高的可靠性.
刘瑾, 赵军辉, 刘云毅 . 瑞利衰落信道下与距离有关的D2D系统可靠性[J]. 应用科学学报, 2018 , 36(3) : 431 -442 . DOI: 10.3969/j.issn.0255-8297.2018.03.003
Under the control of the base station, both sides of the device-to-device (D2D) communication can communicate directly without going through the base station. In order to improve the system capacity, the system reliability and the diversity gain, this paper introduces a relay technology into D2D communication system, and adopts relay strategies including amplify-and-forward mode and decode-and-forward mode. Considering the influence of relay position on the reliability of D2D system, this paper establishes a distance model and derives the formula of the outage probability of the system under different conditions in Rayleigh fading channel. Simulation results show that relay technology can effectively reduce the outage probability in the case of low system channel target rate, that the closer to the midpoint of the D2D communication link the relay node, the lower the outage probability, and that the reliability of the communication relay system is better than that of the non-relayed D2D communication system.
Key words： rayleigh fading; relay; reliability; distance; device-to-device (D2D)
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