文档介绍：华中科技大学
硕士学位论文
基于分集接收的DVB-T双高频头控制系统设计
姓名:张屹
申请学位级别:硕士
专业:通信与信息系统
指导教师:王宏远
20060501
摘要
数字化是电视产业发展的一个趋势,而广播式数字电视系统的建设则是产业内
部的一个热点。随着国家对卫星和有线数字电视接收标准的相继制定,地面数字电
视接收标准的制定也指日可待。为了更好地解决地面接收条件下的多径衰落和信道
估计等问题,本文将结合车载式数字电视接收机的设计实践,介绍一种采用欧洲
DVB-T 标准、基于分集接收的双高频头控制系统。
本系统的硬件采用高集成性的分集接收芯片,软件则按模块化方法进行设计,
各模块任务分工明确,同时向上层提供清晰的接口,因此具有很强的移植性,用户
可以根据需要自行进行后续开发。
本文回顾了数字电视的发展历程,对数字电视的现状和系统组成进行了简单介
绍。在分析现今数字电视的传输和接收标准以及分集接收、正交频分复用的理论基
础上,结合市场实际,确定了硬件整体方案和具体芯片的选择。
在讨论了车载式数字电视接收机平台之后,给出了双高频头控制系统的整体方
案并对硬件与软件两大部分的设计进行了研究。硬件设计部分包含了功能框图、控
制方式的详细说明等,软件设计部分则包括应用接口、功能模块实现、软件流程等
方面的内容。
应用本控制系统的车载数字电视接收机已经投入生产并销往新加坡等地区,该
机的硬件平台稳定,软件层次清晰,可移植性强,深受合作单位好评。
关键词:数字电视;分集接收;正交频分复用;双高频头;控制系统
I
Abstract
Digitization is the development trend of TV industry. Nowadays the construction of
Digital TV broadcast system is a focus. As the establishment of digital receive standard of
satellite and cable, the digital terrestrial receive standard is also going to be established.
For solving the problem of multi-path fading and channel estimation in terrestrial receive,
a dual-tuner control system based on diversity reception which uses the European DVB-T
standard is introduced with considering the practice of digital TV receiver in car.
The hardware uses high-integrated diversity chips. And the software is module
designed which has different modules with specific functions and clear interfaces. So the
system is good for transplanting and father developing.
This paper looks back the developing of digital TV, and also introduces the actuality
and ponents of it. After analyzing the transfer and receive standard of digital
TV, the hardware scheme and the chips are decided with learning the diversity reception
and OFDM theory,
The dual-tuner control system scheme is provided with discussing the platform of
digital TV receiver in car. We have researched in the design of hardware and software.
The hardware design contains function diagrams and control method, while t