UFMC-Based Underwater Voice Transmission Scheme with LDPC Codes

An underwater universal filtered multicarrier (UFMC)-based voice transmission scheme is proposed using a 512-point inverse discrete Fourier transform, utilizing 10 sub-bands, and that each had 20 subcarriers. In this UFMC method, the adaptive modulation technologies with 4 quadrature amplitude (QAM), 16-QAM, low-density parity-check (LDPC) channel coding were integrated. Additionally, bit error rate (BER), power weighting, ratios of power-saving, performance perfect estimation (PCE), 5% 10% errors (CEEs) investigated. The BER quality service 10−3. Simulation results showed PCE outperformed CEEs, under 4-QAM, gains 0.5 0.9 dB, respectively, 4×10−4. 2.4 8.5×10−4. can be applied to below 10−3 system superior capability contend additive white Gaussian noise, multipath fading, CEEs.