High Robust Broadcasting over DTMB-A with Low-rate LDPC Codes  

作　　者：Chao Zhang Kewu Peng Zhitong He Yonglin Xue Hui Yang 

机构地区：[1]Department of Electronic Engineering,Tsinghua University,Beijing 100084,China [2]Beijing National Research Center for Information Science and Technology(BNRist),Beijing 100084,China [3]Peng Cheng Laboratory,Shenzhen 518055,China [4]Key Laboratory of Digital TV System of Guangdong Province and Shenzhen City,Shenzhen 518057,China

出　　处：《China Communications》2022年第3期192-201,共10页中国通信（英文版）

基　　金：supported in part by the National Natural Science Foundation of China(NSFC)under Grant 61931015;the Peng Cheng Laboratory under Grant PCL2021A10;the Science,Technology and Innovation Commission of Shenzhen Municipality(No.JSGG20201103095805015);sponsored by Tsinghua University-Yunnan Mobile Digital TV Company Ltd.,Joint Research Center(JCICBN)。

摘　　要：As the 2nd generation digital terrestrial television broadcasting(DTTB)standard,digital terrestrial/television multimedia broadcasting-advanced(DTMB-A)can provide higher spectrum efficiency and transmission reliability by adopting flexible frame structure and advanced forward error correction coding compared with the 1 st generation DTTB systems.In order to increase the flexibility and robustness of the DTTB network,the frequency reuse scheme of factor one(reuse-1)is proposed,where the same RF channel is used by different stations covering the adjacent service areas.However,it demands a very low carrier-tonoise ratio(C/N)threshold below 0 dB at the DTTB physical layer.In this paper,a robust broadcasting technique is proposed based on DTMB-A with newly designed low-rate low density parity check(LDPC)codes.By adopting quasi-cyclic(QC)Raptor-like structure and progressive lifting method,the high performance low-rate LDPC codes are designed supporting multiple code lengths.Both density-evolution analyses and laboratory measurements demonstrate that DTMB-A with low-rate coding can complete the demodulation reliably with the C/N threshold below0 d B,which is one important necessary condition to support frequency reuse-1 scheme.

关 键 词：digital terrestrial/television multimedia broadcasting-advanced(DTMB-A) digital terrestrial television broadcasting(DTTB) low-rate low density parity check(LDPC)code 

分 类 号：TN934.3[电子电信—信号与信息处理] TN911.22[电子电信—信息与通信工程]