Study of Doppler Shift Correction for Underwater Acoustic Communication Using Orthogonal Signal Division Multiplexing

Abstract

In this study, we apply Doppler shift correction schemes for underwater acoustic (UWA) communication with orthogonal signal division multiplexing (OSDM) to achieve stable communication in underwater acoustic channels. Three Doppler correction schemes, which exploit the guard interval, are applied to UWA communication with OSDM and evaluated in simulations. Through a simulation in which only the Doppler effect is considered, we confirmed that by adapting schemes to UWA communication with OSDM, we can correct large Doppler shifts, which addresses the usual speed of vehicles and ships. Moreover, by considering both the Doppler effect and channel reverberation, we propose the best possible combination of Doppler correction schemes for UWA communication with OSDM. The results suggest that UWA communication with OSDM may lead to high-quality communication by considering channel reverberation and large Doppler shifts.

Experimental Study of Doppler Effect for Underwater Acoustic Communication Using Orthogonal Signal Division Multiplexing

“…To conduct the UWA communication with OSDM in the channel with the Doppler effect, Doppler shift correction for OFDM, 27) which exploits a guard interval, has been applied. 28) The obtained results suggest that under the assumptions that all paths have similar Doppler shift and the UWA channel is coherent during signal transmission, the applied Doppler shift correction worked well enough to enable reliable communication. However, verification of the Doppler shift correction in experiments taking Doppler spread into consideration has not been achieved yet.…”

“…To correct the Doppler shift, three schemes, namely, schemes (i), (i 0 ), and (ii), have been considered as the Doppler shift correction schemes for UWA communication using OSDM in ref. 28. Scheme (i) is a Doppler shift correction scheme for OFDM, proposed by Sandell et al 27) It corrects the Doppler shift, which can be expressed as the phase rotation in the received sequence, by exploiting the guard interval.…”

Experiment of Underwater Acoustic Communication with an Orthogonal Signal Division Multiplexing Scheme in a Harbor

“…As an alternative, we have focused on another scheme for UWA communication: orthogonal signal division multiplexing (OSDM) [20][21][22][23] . The use of OSDM for UWA communication has been considered from several aspects, such as performance evaluation for heavy ISI 24) , for Doppler shift 25,26) , and power efficiency 27) . We have also proposed multichannel OSDM, and compared its performance with single-carrier DFE and OFDM in a test tank with and without surface waves 28) .…”

Improvement of Power Efficiency for Underwater Acoustic Communication Using Orthogonal Signal Division Multiplexing over Multiple Transducers

“…18,19) As an alternative, the application of orthogonal signal division multiplexing (OSDM) has been proposed by the author. [20][21][22][23] OSDM has been proposed for use in mobile wireless communication to achieve reliable channel sensing. [24][25][26] OSDM multiplexes several data vectors -a pilot signal as well as messages -into a single data stream.…”