【作者】 郭翘；

【导师】 张文军；

【作者基本信息】 上海交通大学 ， 信号与信息处理， 2007， 硕士

【摘要】 作为数字电视三大传播方式之一的数字电视地面广播(DTTB: Digital Television Terrestrial Broadcasting),由于地面信道状况复杂,在应用需求上又要求实现移动和便携接收的功能,因此对整个技术系统的要求最高。各国对数字电视的研究已有多年,并形成了相应的传输体系,目前已经形成了的传输标准有:基于COFDM技术的DVB-T(欧洲)和ISDB-T(日本),基于VSB技术的ATSC(美国),以及国家标准融合方案中的单载波标准:上海交通大学基于QAM调制技术的ADTB-T,国家标准融合方案中的多载波标准:清华大学基于TDS-OFDM的DMB-T。标准在技术上各有不同,但均有其自己的优势和劣势,其中信道估计与均衡技术对付信道衰落的能力是目前研究的焦点之一。本文的目的在于,结合两种基于OFDM的数字电视地面广播系统(DVB-T和DMB-T),总结了现有根据频域导频和时域导频的信道估计和均衡技术,并在此基础上,提出了基于频域和时域导频信道估计的新算法和改进算法,力图对OFDM系统的信道估计与均衡技术特点进行深入分析研究,指导OFDM接收机设计本文的创新点之一,在基于频域导频的DVB-T系统中提出了新更多还原

【Abstract】 DTTB (Digital Television Terrestrial Broadcasting), as one of the three digital television transmission techniques, is the most complicated representation for its complexity of ground condition and availability of mobile receiving. Many countries have done research on it for a long time, and they had developed corresponding transmission systems respectively. Nowadays, there are three terrestrial broadcasting standards, e.g. DVB-T (Europe) and ISDB-T (Japan) based on COFDM tech, ATSC (U.S.A) based on VSB tech, and domestic integrated standard: ADTB-T, based on single carrier system, proposed by Shanghai JiaoTong University and DMB-T, based on TDS-OFDM, proposed by QingHua University. Every standard has its unique advantages and disadvantages. And all focus on its channel estimation and equalization.The aim of this article is to evaluate, analyze and summarize various methods of channel estimation and equalization, both in frequency pilots based DVB-T and time-domain synchronous pilots based DMB-T system, furthermore this article proposes several novel channel estimation methods, and gives software simulation results and analysis. This article is also aimed to give a good direction of OFDM receiver’s FPGA design.There are several innovations in this article: first of all, it proposes a novel method using FIR low pass filter in CP-OFDM based DVB-T更多还原