Mobile underwater acoustic communications with multicarrier modulation in very shallow waters

Abstract

Communications in shallow underwater acoustic channel is challenged by strongreverberations, fast time varying statistics and impulsive ambient noise. Using channelmeasurements and analysis studied previously, a complete communication scheme isdeveloped to allow for mobile communications. The receiver design combines differentmethods tested for signal detection, synchronization, mobility-induced Dopplercompensation and channel equalization using spatial diversity techniques. The finalsystem constructed implements linear frequency modulated signals for detection,synchronization and Doppler acquisition, linear interpolation for Doppler compensationand finally orthogonal frequency division multiplexing (OFDM) and differential phaseshift keying (DPSK) for signal and data modulation. The performance results are basedsolely upon simulated data.