基于译码转发的PLC-VLC/RF混合传输系统中断性能分析

Outage performance analysis of a mixed PLC⁃VLC/RF transmission communication system based on DF technology

针对译码转发(Decode and Forward,DF)协议下室内电力线通信(Power Line Communication,PLC)-可见光通信(Visible Light Communication,VLC)/射频(Radio Frequency,RF)的混合传输系统,考虑接收端采用最大比合并(Maximal Ratio Combining,MRC)和选择合并(Selection Combining,SC)两种方案,并分析这两种方案下的系统中断性能。首先,在考虑路径损耗、信道衰落和用户随机分布的情况下,分别给出MRC和SC两种方案的输出信噪比表达式。接着,推导出这两种方案下系统的中断概率闭合表达式。最后,利用计算机仿真验证理论分析的正确性,分析不同参数对系统中断性能的影响,从而为PLC-VLC/RF混合传输系统的实际应用提供理论依据。

For the indoor mixed power line communication(PLC)⁃visible light communication(VLC)/radio frequency(RF)transmission system under the decode⁃and⁃forward(DF)protocol,this paper proposes maximal ratio combining(MRC)and selection combining(SC)schemes,and analyzes the systemsoutage performance.Firstly,the end⁃to⁃end signal⁃to⁃noise ratio(SNR)under MRC and SC schemes is presented by considering the impacts of the pass loss,the channel fading and the randomness of user's location.Secondly,the closed⁃form expressions of outage probability under these two schemes are derived.Finally,the computer simulation validates the theoretical formulas by numerical results,and analyzes the impacts of different parameters on the system outage performance.Our study provides a theoretical basis for the practical application of the considered mixed PLC⁃VLC/RF system.