混合FSO/RF通信系统性能分析与研究

Performance Analysis and Research for Hybird FSO/RF Communication System

传统混合FSO/RF通信系统存在一些固有缺陷,这些缺陷使得混合FSO/RF通信系统的实际应用受到很大限制。将混合信道编码技术应用于混合FSO/RF通信系统,提高混合系统的整体传输性能。混合信道编码技术的主要思想是结合非规则编码和速度自适应编码两种技术,非规则码可以非常有效的处理信道的突发错误,速度自适应技术能有效利用时变系统的信道资源。仿真证明:混合信道编码技术(非规则速度自适应LDPC编码)可以提高混合系统的可靠性,使系统的整体传输性能达到最优。

There are some inherent shortcomings in conventional hybrid FSO/RF communication systems,these shortcomings make the practical application of hybrid systems have a lot of constraints.This article applies hybird channel codes technology to the hybird FSO/RF communication,and it improves the overall transmission performance for hybrid systems.The main idea behind hybrid chan-nel codes is to combine non-uniform coding and rate-adaptive coding,the non-uniformity codes is very effective in dealing with the bursty nature of the channels,while rate-adaptability provides efficient utilization of the time-variant channels.The simulation results show that：Hybrid Channel Codes（non-uniform rate-adaptive LDPC code）can improve the reliability of hybrid systems,and make the overall system to achieve optimum transmission performance.