Doppler-Resilient Orthogonal Signal-Division Multiplexing for Underwater Acoustic Communication

Doppler-Resilient Orthogonal Signal-Division Multiplexing for Underwater Acoustic Communication

Ebihara, T. (University of Tsukuba)
Leus, G.J.T. (TU Delft Signal Processing Systems)

2015-10-16

Underwater acoustic (UWA) channels are characterized by a severe spread in time and frequency, and are usually labeled as “doubly spread channels.” In this paper, we propose Doppler-resilient orthogonal signal-division multiplexing (D-OSDM), to provide a highly reliable communication environment in doubly spread channels for UWA communication. D-OSDM multiplexes several data vectors in addition to a pilot vector, and preserves orthogonality among them even after propagation through doubly spread channels, under the assumption that the channel can be modeled by a basis expansion model (BEM). We describe the signal processing steps at the transmitter and the receiver for D-OSDM, and evaluate its performance by both simulations and experiments. To generate a doubly spread channel, a test tank with a wave generator is employed. The obtained results suggest that D-OSDM can provide low-power and high-quality UWA communications in channels with large delay and Doppler spreads; for example, D-OSDM succeeds to achieve a block error rate (BLER) of 10 -3 while BEM-based orthogonal frequency-division multiplexing (OFDM) has a BLER floor of 10 -2 in the experiments. Equivalently, D-OSDM can reduce the signal power required for communications to achieve the same BER significantly. Overall, it was found that D-OSDM can become a powerful communication tool for underwater operations.

underwater acoustic (UWA)
communication
Doppler
multipath channels

http://resolver.tudelft.nl/uuid:b8acf843-a613-41c7-9634-7268fade0ce3

https://doi.org/10.1109/JOE.2015.2454411

0364-9059

IEEE Journal of Oceanic Engineering, 41 (2), 408-427

Institutional Repository

journal article

© 2015 T. Ebihara, G.J.T. Leus