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清华大学学报(自然科学版)  2015, Vol. 55 Issue (5): 520-525    
  电子工程 本期目录 | 过刊浏览 | 高级检索 |
基于LDPC码的速率增强JTIDS波形设计
吴钊1, 张彧1, 宋健1,2
1. 清华大学 电子工程系, 清华信息科学与技术国家实验室, 北京 100084;
2. 数字电视国家工程实验室(北京), 北京 100091
Rate-enhanced JTIDS waveform based on LDPC
WU Zhao1, ZHANG Yu1, SONG Jian1,2
1. Tsinghua National Laboratory for Information Science and Technology, Department of Electronic Engineering, Tsinghua University, Beijing 100084, China;
2. National Engineering Laboratory for DTV (Beijing), Beijing 100091, China
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摘要 联合战术信息分发系统(JTIDS)因其抗干扰性强、 保密好、 通信范围大和部署灵活等特点吸引了众多关注。该文在研究JTIDS信号传输模型的基础上, 提出了一种基于低密度奇偶校验码(LDPC)的速率增强波形方案。该方案将优化的MSK软解调方式与LDPC码结合, 从而获得了良好的传输性能。计算机仿真表明: 该方案不仅传输速率比原JTIDS信号的提高了一个数量级, 而且解调门限和通信距离并未大幅下降。与当前几种速率增强方案相比, 该方案具有一定的领先性, 能满足JTIDS终端对于高速数据传输的需求。
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关键词 联合战术信息分发系统低密度奇偶校验码高速传输软解调    
Abstract:Joint tactical information distribution systems (JTIDS) have attracted much attention due to their anti-interference capabilities, security, long communication range, flexible deployment, etc. This paper describes a rate-enhanced JTIDS waveform based on the low density parity check code (LDPC). The optimized MSK soft demodulation method is combined with the LDPC code in the waveform to give significantly improved performance. Simulations demonstrate that the transmission rate of this waveform is an order of magnitude higher than the original JTIDS signal with only a slight decrease in the demodulation threshold and communication range. This scheme is better than several conventional rate-enhanced schemes and can be used in high data rate JTIDS terminals.
Key wordsjoint tactical information distribution system (JTIDS)    low density parity check code (LDPC)    high-data-rate transmission    soft demodulation
收稿日期: 2015-04-28      出版日期: 2015-08-04
ZTFLH:  TN914.4  
通讯作者: 张彧,副教授,E-mail:zhang-yu@tsinghua.edu.cn     E-mail: zhang-yu@tsinghua.edu.cn
引用本文:   
吴钊, 张彧, 宋健. 基于LDPC码的速率增强JTIDS波形设计[J]. 清华大学学报(自然科学版), 2015, 55(5): 520-525.
WU Zhao, ZHANG Yu, SONG Jian. Rate-enhanced JTIDS waveform based on LDPC. Journal of Tsinghua University(Science and Technology), 2015, 55(5): 520-525.
链接本文:  
http://jst.tsinghuajournals.com/CN/  或          http://jst.tsinghuajournals.com/CN/Y2015/V55/I5/520
  图1 JTIDS信号的几种数据包结构
  图2 原JTIDS波形方案传输模型简图
  图3 本文所提LDPCGJTIDS波形方案传输模型简图
  图4 AWGN 信道中不同MSK 解调的性能曲线
  图5 LDPCGJTIDS波形1.1Mb/s模式的性能曲线
  图6 多径信道中LDPCGJTIDS波形的性能曲线
  表1 JTIDS及各种改进波形性能比较
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