节点文献

数字视频广播OFDM传输系统中的同步技术

Synchronization Technique in OFDM Transmission System for Digital Video Broadcasting

【作者】 赵妍妮

【导师】 葛建华;

【作者基本信息】 西安电子科技大学 , 通信与信息系统, 2002, 硕士

【摘要】 本文介绍了高清晰度电视的发展概况,阐述了OFDM传输原理和数字地面视频广播(DVB-T)系统的COFDM实现方案。讨论了多载波传输系统的接收同步理论,重点对OFDM接收机方案中基于保护间隔的符号定时估计、频率偏移估计进行了原理分析,提出了改进算法。同时对OFDM传输系统的符号同步控制、频率同步控制、采样钟同步控制控制作了详细阐述,对A/D前端数字下变频和高频头自动增益控制也作了理论分析。在用Matlab作了算法仿真之后,提出了一套基于FPGA实现的设计方案,最后完成了电路的Quartus仿真和FPGA硬件电路的实现。通过调试,整个方案工作性能达到预期目的。

【Abstract】 Background as the development of HDTV is, this paper presents the theory of multi-carrier modulation-OFDM technology and DVB-T COFDM scheme. Based on OFDM synchronization theory and signal mode, algorithms of timing and carrier frequency offset estimation with guard intervals between OFDM symbols is proposed. The control structure of symbol , frequency and sampling clock synchronization is mainly discussed also. The principles of digital PLL control loop, AGC, digital Frequency-Down-Conversion are follwed. Finally, some algorithms are simulated and some design schemes applied to FPGA proposed. This paper also makes a simulation of circuits with Quartus and FPGA-hardware into reality.

  • 【分类号】TN941.3
  • 【被引频次】4
  • 【下载频次】1
节点文献中: 

本文链接的文献网络图示:

本文的引文网络