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
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.
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