首先提出一种基于RoF(光载无线)技术在高铁车厢内实施分布式宽带无线接入的方案,该方案具有低发射功率、分布式微小区覆盖和多接入点等特点;随后,利用FDTD(有限差分时域)算法软件建立了一套高铁车厢电磁环境分析模型,对宽带接入环境下车厢内的电磁辐射进行了分析;通过对比RoF分布式方案和传统无线接入系统发现,RoF无线接入系统能够在产生更小功耗的同时降低车厢内耦合电场强度4～6 dB,从而有效降低了对车载设备的电磁干扰.

This paper first proposes a RoF-based scheme for providing distributed wideband access in high-speed train compartments,which is characteristic of low transmitting power,distributed micro-cell coverage and multi-access points.Then,it builds a model by using the Finite-Difference Time-Domain (FDTD) algorithm software for the evaluation of the electromagnetic radiation effects in the compartments. In comparison with the conventional wireless access systems,the RoF-based system lowers the coupling electric field intensity in the compartments by 4~6 dB,while causing less power consumption,thus effectively reducing the electromagnetic interference to the on-board devices.