【作者】 王玲；

【导师】 李兵兵；

【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数字电视在国内的发展状况，并将国际上的两大数字电视地面广播信道传输标准ATSC和DVB-T进行了比较，在此基础上进一步阐明COFDM传输系统的原理和特点。本文详细阐述了COFDM系统的信道编码和调制部分的组成方案，并重点研究了发射端信道编码和调制电路以及帧形成电路的设计，具体包括前端控制、加扰、RS编码、外交织、卷积编码、内交织、映射和OFDM帧形成等模块。该设计方法也同样适用于类似的COFDM信道传输系统。通过Matlab仿真，利用Altera公司开发的QuartusⅡ设计、编译、仿真软件平台，采用相关硬件测试手段，最终完成电路的FPGA实现和调试。该电路在系统中工作稳定，整机正在接受北京和上海实验区的测试。更多还原

【Abstract】 In this paper, we first introduce the development of high definition television in our country and the principle of COFDM technique, followed by comparing the two channel transmission standards between ATSC and DVB-T for digital terrestrial television. After describing channel coding and modulation system based on COFDM transmission scheme, we study the methods of circuit design in all blocks, including front control, randomization, Reed-Solomon code, outer interleaving, inner interleaving, mapping and frame shaping. These methods of system design can also be applied to other systems similar to the scheme we adopt. Finally, we using some software and hardware, such as Matlab Quartus II and Logic Analysis System, to realize the whole circuit function by FPGA. Presently our system is tested in Beijing and Shanghai, and the circuit operates reliably.更多还原