Application of differential amplitude and phase-shift keying in underwater acoustic communication based on orthogonal frequency division multiplexing

Abstract

With the increase of of marine resource and underwater users, developing a high-bit-rate underwater acoustic communication has become a hot topic. APSK (Amplitude and Phase-shift Keying) is a modulation technique having high efficiency in spectrum utilization, it attracts more and more attention in high-bit-rate underwater acoustic communication. Differential APSK (DAPSK) is modulated using differential amplitude and phase code in time domain, and it has higher bandwidth efficiency and be easier to realize the system than APSK. A transmission system based on DAPSK modulation and OFDM is presented to solve the problems of effectiveness and reliability in high-bit-rate underwater acoustic communication. Simulation results show that the system using DAPSK modulation has a better performance than those using APSK and QAM modulation. © 2013 Acoustical Society of America.