| 一种应用于数字电视地面广播的信道编码调制方法 |
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| 引用本文： | 韩猛,门爱东,潘长勇,杨知行. 一种应用于数字电视地面广播的信道编码调制方法[J]. 北京邮电大学学报, 2004, 27(2): 72-76 |
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| 作者姓名： | 韩猛 门爱东 潘长勇 杨知行 |
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| 作者单位： | 清华大学,电子工程系,北京,100084;北京邮电大学,电信工程学院,北京,100876 |
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| 基金项目： | 高等学校优秀青年教师教学科研奖励计划 |
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| 摘 要： | 提出了一种应用于数字电视地面广播(DTTB)的新的编码调制方案.首次以多级分组乘积码代替传统的串行级联编码结构,提高了频谱效率;同时采用一种多分辨率64QAM星座图,可在一个DTTB信道中提供3种级别的服务.在接收端采用基于MAX-LOG-MAP准则的迭代Turbo译码算法以获得可靠接收.仿真结果表明,在视觉门限BER=3×10-6处,高优先级码流的比特信噪比约为7dB,适用于高可靠性的服务.中优先级和低优先级码流可支持室外固定接收.
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| 关 键 词： | 数字电视地面广播 地面数字多媒体/电视广播协议 分组乘积码 分级调制 |
| 文章编号： | 1007-5321(2004)02-0072-05 |
| 修稿时间： | 2002-12-10 |
A Novel Channel Coding and Modulation Scheme Adopted in the Digital Television Terrestrial Broadcasting |
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| HAN Meng,MEN Ai-dong,PAN Chang-yong,YANG Zhi-xing. A Novel Channel Coding and Modulation Scheme Adopted in the Digital Television Terrestrial Broadcasting[J]. Journal of Beijing University of Posts and Telecommunications, 2004, 27(2): 72-76 |
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| Authors: | HAN Meng MEN Ai-dong PAN Chang-yong YANG Zhi-xing |
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| Affiliation: | HAN Meng~1,MEN Ai-dong~2,PAN Chang-yong~1,YANG Zhi-xing~1 |
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| Abstract: | A new channel coding and modulation scheme adopted in Digital Television Terrestrial Broadcasting (DTTB) is presented, in which multilevel Block Product Code (BPC) is for the first time introduced to replace the serially concatenated coding architectures to improve spectrum efficiency and a multi-resolution 64QAM constellation is used for hierarchical modulation to offer three tiers of services within one DTTB channel. In the receiver, an iterative turbo decoding algorithm based on MAX-LOG-MAP criterion is adopted to achieve robust reception. Simulation shows that the bit SNR of High Priority stream is about 7 dB at the Threshold of Visibility, which is competent for services requiring high reliability. The Medium and Low Priority streams can support fixed outdoor reception. |
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| Keywords: | DTTB DMB-T BPC(block product code) hierarchical modulation |
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