Hamming Distance Optimized Underwater Acoustic OTFS-IM Systems

The orthogonal time frequency space (OTFS) modulation technique can provide reliable communication in time-varying channels. Due to the dispersive characteristics of underwater acoustic channels, this paper proposes an OTFS-IM system based on Hamming distance optimization reduce impact dispersion communication. Firstly, is introduced, which introduces index into Delay–Doppler (DD) domain make OTFS have stronger anti-Delay–Doppler capability. In contrast, since there sequence redundancy a specific combination, model used eliminate redundant combination and further improve bit error rate performance system. addition, optimized verified by simulation analysis. results show that proposed achieve more performance.