电力线和自由光混合通信系统的中断概率分析

Analysis of the outage probability for mixed PLC-FSO communication systems

分析了混合电力线通信(power line communication,PLC)-自由空间光(free-space optical,FSO)通信系统的中断概率。具体而言,首先在PLC链路中考虑背景噪声和脉冲噪声,在FSO链路中考虑指向误差等实际因素的情况下,建立多用户场景下的混合PLC-FSO通信系统模型,并在中继采用门限判断译码转发协议的条件下,得到系统的输出信噪比计算式。接着,假设PLC链路服从对数正态分布,而FSO链路服从Gamma-Gamma分布,推导出系统的中断概率闭合计算式。为了便于进一步分析系统的性能,还分析了高信噪比条件下的系统中断概率近似计算式、分集度和阵列增益。最后,仿真验证了理论分析的正确性,并进一步分析相关参数对系统性能的影响,从而为整个系统设计提供参考。

The outage probability of a mixed power line communication and free-space optical communication(PLC-FSO)system with multiuser was investigated.First of all,by assumption that PLC link was affected by both additive background noise and impulsive noise,and FSO link was affected by the pointing error,a mixed PLC-FSO communication system model in multiuser scenario was established and the output signal-to-noise ratio(SNR)of the system was obtained with threshold-based decode-and-forward(DF)protocol.Next,by considering the PLC link obeyed lognormal distribution,while the FSO link obeyed Gamma-Gamma distribution,the closed-form outage probability expression for the considered system was analyzed.Furthermore,the asymptotic outage probability for-mula at high SNR was also derived to show the diversity order and array gain of the considered system.Finally,computer simulations were provided to validate the correctness of the theoretical analysis,and the influence of related parameters on system performance was also analyzed.As a result,it provides guidance for the entire system design.