Impact of multipath effects on theoretical accuracy of TOA-based indoor VLC positioning system
Impact of multipath effects on theoretical accuracy of TOA-based indoor VLC positioning system
复制标题
多径效应对基于TOA的室内VLC定位系统理论精度的影响
DOI：
10.1364/prj.3.000296
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发表时间：
2015-12-01
影响因子：
7.6
通讯作者：
Shi, Ancun
中科院分区：
文献类型：
--
作者：
Sun, Xuqing;Duan, Jingyuan;Shi, Ancun
讨论了非视距环境下基于到达时间（TOA）的室内可见光通信（VLC）定位系统。假设传播延迟是伽马分布的。推导了多径传播的广义Cramer-Rao下界作为理论精度限制。定位系统的性能受伽玛分布的形状参数和尺度参数的影响。通过讨论伽马分布参数的物理意义，分析了多径效应对定位精度的影响。当非视距传播引起的路径长度方差为零时，定位精度达到下界。仿真结果表明，在给定场景下，理论定位精度在厘米量级。(C) 2015中国激光出版社
This paper discusses the time-of-arrival (TOA) based indoor visible light communication (VLC) positioning system in a non-line-of-sight environment. The propagation delay is assumed to be gamma distributed. The generalized Cramer-Rao lower bound for multipath propagation is derived as the theoretical accuracy limitation. The performance of the positioning system is affected by the shape parameter and the scale parameter of gamma distribution. The influences on positioning accuracy of multipath effects are analyzed through discussing the physical meaning of the gamma distribution parameters. It is concluded that the lower bound of positioning accuracy is attained when variance of the non-line-of-sight propagation-induced path lengths is zero. The simulation result proves that the theoretical positioning accuracy is in the order of centimeters with the given scenario. (C) 2015 Chinese Laser Press