Differential Multiple Single Carrier Modulation Schemes for Underwater Acoustic Communications and These Experimental and Field Evaluation Results

Abstract

This paper discusses experimental and field evaluation results of differential multiple single carrier (MSC) modulation schemes for underwater acoustic communications (UWACs). UWACs suffer from severe doubly-selective channels and inter-carrier interference due to non-uniform frequency offset. In addition, assuming image data communications, UWACs have to improve frequency efficiency. In order to solve these issues, this paper proposes a wireless transmission scheme, which employ differential MSC modulation schemes. Next, this paper investigates parameters for 8kbps-UWACs and 64kbps-UWACs aiming at wireless control of autonomous underwater vehicle and image data communications, respectively. Finally, two experimental and field evaluation results in acoustic experimental pool and shallow-sea environment confirm that the UWAC MODEMs have excellent performance on severe doubly-selective channels.