再谈地面数字电视单载波系统移动接收的实现  

Further Discussion of Mobil Reception Implementation in Single Carrier Systems of Digital Terrestrial Television Transmission

作　　者：徐孟侠[1] 

机构地区：[1]北京大学电子学系,北京100871

出　　处：《电视技术》2013年第4期22-28,共7页Video Engineering

摘　　要：作为《地面数字电视单载波系统如何实现移动接收》的续篇，在回顾典型案例及介绍地面数字电视单载波系统的新进展后，补充讨论接收端的一些时间域处理技术：1）从相位域和时间域分析主信号和单个“0dB回波”的能量叠加后，C／N门限值可望下降约1．5～2．5dB；2）对“同步码捕获／保持”采用“部分序列法”可缩短所需时间，作补充说明；3）对自适应信道均衡器的卷积运算则提出“6msb（最高有效位）／符号处理法”替代原8比特／符号，以显著节省运算资源。As the continuation of ＂How mobile digital television reception can be realized in single carrier systems＂, after reviewing its typical implementations and the recent progress of DTT single carrier systems, some time domain processing techniques in the receivers are discussed additionally： 1） the basic idea in phase and time domains, decreasing 1.5~2.5 dB in C/ N threshold value is discussed, by combining the energy of main signal and single ＂0 dB echo＂. 2） ＂partial sequence method＂ is explained additionally, to shorten the time needed for ＂capture/hold of synchronous code＂. 3） ＂6 msb processing/symbol＂, instead of 8 bits/symbol, is proposed for adaptive channel equalizer in the convolution, as to save the computing resources significantly.

关 键 词：地面数字电视传输 移动数字电视接收 单载波系统 

分 类 号：TN949.197[电子电信—信号与信息处理]