基于LDPC码的速率增强JTIDS波形设计

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清华大学辅仁网/2017-07-07

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 Jian^1,2

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

摘要:

输出: BibTeX | EndNote (RIS)

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。

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 words：joint 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.cnE-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

图表:

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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