基于HCPP的室内VLC系统CSMA网络建模和性能分析

Modeling and performance analysis of indoor VLC system CSMA network based on HCPP

研究了大型室内光物联网中实现光载波侦听多址接入(CSMA)的可行性。采用随机几何分析建模,将室内节点利用漫反射光完成载波侦听的过程抽象为独立集的选择问题,用硬核点过程(HCPP)建模通信节点的随机接入过程,得到载波侦听阈值和并发节点密度的关系表达式。仿真分析了泊松点过程(PPP)节点密度、发射角和载波侦听阈值对并发节点密度的影响。结果表明,对于每个特定的发射角存在一个最佳的载波侦听阈值,可以使同时通信的节点数目最多。

This paper explores the possibility of realizing the CSMA mechanism in a large indoor optical internet of things environment.We abstract indoor nodes using diffuse reflection light to complete carrier sense process into the choice problem of independent sets based on stochastic theory,which models the process of random access of communication nodes based on hard core point process（HCPP）.We derive the relational expression between carrier-sensing threshold and the intensity of simultaneous active transmitters.We analyze how possion point process（PPP）node density,carrier-sensing threshold and the emission angle of LED light source affected the intensity of simultaneous active transmitters.The results show the existence of an optimal carrier-sensing threshold for a given emission angle which maximizes the intensity of simultaneous active transmitters.