Experimental Study on Doppler Shift Compensation for Underwater Acoustic Communication Using Orthogonal Signal Division Multiplexing

Limited bandwidth, multipath-induced signal fading, and motion-induced Doppler effect makes underwater acoustic (UWA) communication still an ongoing challenge. Among numerous interesting researches on UWA communication, the application of orthogonal signal division multiplexing (OSDM) has been proposed by authors. In our previous work, it was found that the UWA communication with OSDM achieves high-quality data transmission in heavy multipath channels compared to the exiting UWA communication with DFE. However, it was also found that the UWA communication with OSDM is more sensitive to the Doppler shift compared to the existing UWA communication . To achieve communication under Doppler shift environment, Doppler shift compensation, proposed by Sandell, was considered and evaluated in simulation . The obtained results suggest that OSDM can achieve communication under Doppler shift environment by applying the compensation . In this paper, we experimentally evaluated the UWA communication with OSDM applying Doppler shift compensation to confirm the simulation results.