数字广播信号地铁共缆传输系统研究分析

Study and Analysis of Common Cable Transmission of Digital Broadcast Signal in Metro

为了解决无线数字广播信号在盲区内的覆盖问题,通常采用补点转播机(Gap Filler)加定向天线的覆盖方式,但在地铁及隧道内不适合采用该方式。因此,要实现数字广播信号在这类狭长形地下场所的有效覆盖,建议采用与移动通信系统共缆传输的方式。本文主要通过上海某地铁隧道内的覆盖实例来介绍基于泄漏电缆的数字广播信号覆盖试验系统,同时提出了共缆系统的设计方法和参数选择,并对系统的实际测试数据进行了分析。

To implement an effective coverage of metro and other long and narrow underground places with broadcasting,the Digital Radio and Television R&D Center,Shanghai Oriental Pearl (Group) Co.,Ltd.,strived to explore a common cable transmission mode for radio and TV signal and that of mobile communication using the existing communication network. Taking the coverage of some metro tunnel in Shanghai for example,a test system for a leakage cable-based coverage with digital broadcast signal is introduced,a design method and parameter selection for common cable system are proposed,and an analysis of measured system data is made.