分级传输技术在数字电视地面广播中的应用研究

Study on the application of hierarchical transmission technique in terrestrial digital TV broadcasting

阐述分级调制的基本原理，描述均匀星座和非均匀星座ＭＱＡＭ格雷映射的实现方法，分级传输可实现数字电视的多分辨率地面广播，介绍分级信道编码的原理，提出分级信道编码的一种多步译码方法。

The basic principle of hierarchical modulation is elaborated and MQAM and non-uniform-MQAM using Gray mapping is described in this paper. Hierarchical transmission can implement multi-resolution terrestrial broadcasting of digital TV. The principle of hierarchical channel coding is introduced and a multistage decoding algorithm is proposed.