数字广播信号地铁共缆传输系统研究分析
章丽君 戴懿贺 上海东方明珠广播电视研究发展有限公司

摘要：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GAPFILLER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。本文中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。
关键字：数字广播 泄漏电缆 共缆 覆盖
Study and Analysis of Common Cable Transmission of Digital Broadcast Signal in Metro
Zhang Lijun Dai Yihe Shanghai Oriental Pearl Radio and TV R&D Co,. Ltd.
Abstract: To solve the problem of coverage for terrestrial broadcasting signal in shadow zone, we usually adopt the system consisting of Gapfiller and directional antenna, but it is unsuitable in subway and tunnel, so we suggest transmitting terrestrial broadcasting signal in the common cable with mobile communication system. In this paper we discuss the L band DAB coverage system using leakage cable by example of Shanghai subway coverage system. Meanwhile, it offer the designing manner of system and selecting of parameters, and analyze the data of real test.

Key words: DAB, leakage cable, in the common cable, coverage