【作者】 胥凌燕；

【导师】 申敏；

【作者基本信息】 重庆邮电大学 ， 通信与信息系统， 2008， 硕士

【摘要】 在科技日新月异的今天,世界通信与信息技术的迅猛发展将引发整个电视广播产业链的变革,数字电视是这一变革中的关键环节。清华大学在1999年原创性的提出了具有完整知识产权的DMB-T标准方案,随后和北京凌讯华业科技有限公司在原有研究成果的基础上,提出了一种新颖的、适合我国国情的地面数字电视传输方案DMB-TH。DMB-TH系统体现了自主创新具有与国外数字电视地面传输标准不同特点,融合了最新提出的LDPC低密度纠错编码技术,利用特殊设计的PN序列作为同步和信道估计的符号保护间隔填充方法,去掉了导频,提高了频谱利用率又易于单载波和多载波调制两种模式的集成。该系统在抗衰落、抗干扰力,信道估计和跟踪上较易,也可支持移动接收。本文通过对DMB-TH系统的分析,对其中关键的FIR滤波器部分、PN相关去除部分、以及OFDM解调中FFT部分提出了具体的硬件实现方案,并用硬件描述语言实现了部分模块的功能,本文工作的重点和主要创新在于:1.分析成型滤波器的原理和实现方法,根据奈奎斯特FIR滤波器的设计原理,设计了一种33阶根升余弦函数FIR滤波器,进行其硬件实现,并验证通过。2.针对DMB-TH系统特有的PN序列,对其接收端去除的方法进行研究,得出了PN序列去除的关键部分---相关部分的方法,并使用优化方式进行硬件设计实现。3.针对DMB-TH系统,通过特定的3 780点FFT的设计,确定了一种比较有针对性的算法,并对其重点的WFTA部分做了设计实现。最后对其中的主要模块进行了分析和设计,达到运算量适当,硬件实现方式难易度合适的效果。更多还原

【Abstract】 Nowadays, technology changes every passed day, and the development of communication and information make the whole television broadcast industry a noticeable evolution. In 1999 the Chin Hua University put forward the DMB-T standard programmes by the original of intellectual property right, later on with Beijing Lingxun technology limited on the basis of research results, putting forward a novel, suitable project for our country state of the ground digital television transmission DMB-TH。DMB-TH system embodies the independent innovation and abroad with foreign ground digital TV transmission standard different characterist- ics. It integrates the latest low-density LDPC error correction coding techniques, using the PN sequence of special design as synchronization and channel estimation as a method to protect the symbol interval filling, getting rid of leader frequency, raising frequency spectru- m utilization and being easy to integrate two models of single-carrier and multicarri- er modulation. The system is easy in carrying out of anti-fading, and anti-edge, channel estimation and tracking, but also to support mobile reception.Based on the analysis of DMB-TH system, a key part of the FIR filter, removi- ng some of PN-related, as well as in FFT OFDM demodulator part of a specific hardware implementation programmes are using hardware description language to realize part of the function module. The emphasis and innovation of the dissertation is:1. Analysis of forming filter principle and method and according to the design principle of the Nyquist filter of FIR, we design a FIR filter which uses root raised cosine function of 33 taps. We carry out its harware implemeation and validation through.2. Against with DMB-TH system special PN sequence, we research its receiver removal methods and get the removal of PN sequence plan- a key part of the relevant parts and the use of hardware design optimization approach to achieve.3.For DMB-TH system, through the 3 780-point FFT specific design, we determine a more specific algorithm. We focus on doing some of the WFTA Design and Implementation. Finally, we design the main module for the analysis and arrive at the appropriate hardware and ease of appropriate way to achieve results.更多还原