Study on LDPC Coded SFH System with Multi-Tone Interference

Low-Density Parity-Check code, for its admiring performance which is close to the Shannon limit, has attracted large attention in anti-jamming systems. In this paper, we studied the LDPC coded slow frequency-hopping (SFH) system and analyzed its performance with Multi-tone Interference (MTI). Three modulation schemes (BPSK, QPSK and 8PSK) are adopted in the system. Especially for 8PSK, we compared the performance of two different soft-decision demodulation schemes over additive white Gaussian noise (AWGN) channel. Also, the influences of code rate, code length, modulation scheme and jamming mode are analyzed and examined, respectively. Finally, some valuable guidelines for designing LDPC coded SFH system are proposed. Simulation results demonstrate that a desirable performance can be achieved with the appropriately designed LDPC in SFH system.