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

T. Ebihara, G. Leus

Research output: Contribution to journalArticleScientificpeer-review

39 Citations (Scopus)
31 Downloads (Pure)

Abstract

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.
Original languageEnglish
Pages (from-to)408-427
Number of pages20
JournalIEEE Journal of Oceanic Engineering
Volume41
Issue number2
DOIs
Publication statusPublished - 16 Oct 2015

Keywords

  • underwater acoustic (UWA)
  • communication
  • Doppler
  • multipath channels

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