基于LDPC码的速率增强JTIDS波形设计
Rate-enhanced JTIDS waveform based on LDPC

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。
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.