分级传输技术在数字电视地面广播中的应用研究

摘要

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．%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。