标题: | 应用于地面数位电视广播系统之时序同步化设计 Timing Synchronization for DVB-T System |
作者: | 管成伟 Cheng-Wei Kuang 李镇宜 Chen-Yi Lee 电子研究所 |
关键字: | 数位电视广播;时序同步化;DVB-T;OFDM;Synchronization |
公开日期: | 2003 |
摘要: | 对于正交分频多工的通讯系统而言,时序同步化是非常重要的,影响传输效能甚大,本论文的目的是设计一套时序同步化机制其中包含符号同步和取样频率同步。在此我们选择地面数位电视广播系统作为研究主题,我们在Matlab上建立了一个完整的模拟平台其中包含传送端、通道模型以及接收端,我们会先对平台做一个完整介绍,并且把各种通道模型做一份完整的分析。 在同步系统的第一步,我们利用周期尖峰的特性侦测传输模式与防护区间的长度,之后我们对许多简略符号同步的演算法做了一个详尽的比较,为了找到更精确的符号边界,我们提出了一套具有创新的尖峰侦测策略的低复杂度精准符号同步方法。在取样频率同步的部分,我们提出一套全数位的同步机制,其中包括一个内含内插与降频功能的重新取样器,以及新提出的以线性最小平方法理论为基础的取样频率飘移侦测设计,再加上可多级变动系数的循环滤波器。我们会秀出整个系统的效能以及对都卜勒效应的容忍度,最后,我们会对每块模组做硬体架构上的说明。 The synchronization of symbol timing and sampling clock is very important for the OFDM communication system. In this thesis, a whole timing synchronization scheme including symbol synchronization and sampling clock synchronization is presented. The DVB-T (Digital Video Broadcasting – Terrestrial) system is chosen for the research topic. A complete simulation platform which contains transmitter, channel and receiver is built in Matlab. The overview of DVB-T system is presented first. Then the various channel distortions like multipath fading, Doppler, CFO and SCO will be analyzed clearly. Employing flat peak period decision, the blind Mode/GI detection is exploited as the first stage of synchronization. A detail comparison of different coarse symbol synchronization algorithms is then presented. For more accurate symbol timing, we will illustrate the proposed low complexity fine symbol synchronization with new peak detection strategy. In sampling clock synchronization, a proposed resampler combining interpolator with decimator can reduce nearly half of power consumption. Subsequently, a SCO estimation based on LLS algorithm with the multi-stage tracking loop is proposed which improves the conventional designs. At last of this thesis, the architecture design of each block is presented respectively. |
URI: | http://140.113.39.130/cdrfb3/record/nctu/#GT009111655 http://hdl.handle.net/11536/44168 |
显示于类别: | Thesis |
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