用于地面数字电视系统的多级编码调制技术  

A Multilevel Code Modulation Technology for Terrestrial Digital TV Broadcasting System

作　　者：孙向涛[1] 龚克[1] 

机构地区：[1]清华大学电子工程系微波与数字通信技术国家重点实验室,北京100084

出　　处：《电视技术》2008年第4期11-13,共3页Video Engineering

基　　金：清华-高通联合研究计划资助项目

摘　　要：在地面数字电视广播系统中,为了满足不同信道条件和不同接收设备的用户需要,提出了一种多级编码调制的方案。把广播数据分成多个优先级,使用多级编码调制和集分割映射技术,为不同优先级的数据提供不同的差错保护。解码时采用多阶段译码的方法,使得用户可以根据自身信道的质量或者接收设备的能力,获得相应的数据传输率。仿真结果表明,该方案在AWGN和多径信道下都具有较好的性能。A muhilevel code modulation scheme is proposed to meet the needs of users with different channel quality and apparatus capability in digital terrestrial TV broadcasting system. In this scheme, data is divided into different levels, and muhilevel code modulation and set partitioning techniques are used to offer unequal error protection to data with different priorities. Multistage decoder is adopted,which allows user to receive data at different rate according to its transmission channel quality or its receiver ability. Simulation results show that this scheme has good performance in both AWGN channel and muhi-path channel.

关 键 词：多级编码调制 集分割 多阶段译码 不同的差错保护 

分 类 号：TN949.197[电子电信—信号与信息处理]