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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。
JTIDS attracts a lot of attention because of its strong anti-interference, good confidentiality, large communication range and flexible deployment. Based on the study of JTIDS signal transmission model, this paper proposes a rate-enhanced waveform scheme based on low-density parity-check codes (LDPC). The program will be optimized MSK soft demodulation method combined with the LDPC code, resulting in good transmission performance. Computer simulation shows that the proposed scheme not only improves the transmission rate by one order of magnitude compared with the original JTIDS signal, but also does not significantly reduce the demodulation threshold and communication distance. Compared with several current rate enhancement schemes, this scheme has a certain lead and can meet the requirements of JTIDS terminals for high-speed data transmission.