HDTV中的解映射与量化

Demapping and quantization in HDTV

在认真分析欧洲数字视频地面广播 (DVB-T)系统的 COFDM(编码的正交频分复用 )调制方案基础上 ,深入研究了 HDTV (高清晰度数字电视 )技术中解映射与量化的基本原理 ,通过 Matlab和 Quartus仿真 ,提出一种新的、适合于 COFDM传输系统的、基于 FPGA(现场可编程门阵列 )的解映射与量化电路设计方案 ,利用 Altera公司生产的 APEXTM 2 0系列芯片完成了相应的硬件电路 ,经国家高清电视总体组HDTV样机调试证明 ,这种方案简单易行、节省资源且性能优良。

The fundamental theory of demapping and quantization in HDTV(High definition TV) technique, on the basis of analyzing the modulation scheme of COFDM(Coded orthogonal frequency division multiplexing) in DVB T system is studied. A new demapping and quantization scheme based on FPGA(Field programmable gate array) and suitable for COFDM transmission system is proposed. The corresponding hardware circuit is finished using chips of the APEX TM 20 series produced of Altera company. Through the testing process with functional HDTV in TEEG, the scheme is proven to be simple, easy to apply and has excellent performance.