Performance of turbo coded FH/MFSK in shallow water acoustic channel

This paper is concerned with the performance of turbo coded FH/MFSK system in adverse shallow water acoustic channel. A soft decision statistic extraction algorithm suitable for noncoherent orthogonal M-ary FSK demodulation is presented. Then the system's bit error probability performance with SOVA and Log-MAP decoding algorithm is carefully investigated through computer simulations and lake trials. Both simulations and analyses of lake trials demonstrate the excellent performance of this integrated approach to reliable acoustic communications.