Efficient use of space-time clustering for underwater acoustic communications

Jianghui Li, Yuriy Zakharov

Research output: Contribution to journalArticlepeer-review


Underwater acoustic (UWA) communication channels are characterized by the spreading of received signals in space (direction of arrival) and in time (delay). The spread is often limited to a small number of space-time clusters. In this paper, the spacetime clustering is exploited in a proposed receiver designed for guard-free orthogonal frequency-division multiplexing (OFDM) with superimposed data and pilot signals. For separation of space clusters, the receiver utilizes a vertical linear array (VLA) of hydrophones, whereas for combining delay-spread signals within a space cluster, a time-domain equalizer is used. We compare a number of space-time processing techniques, including a proposed reduced-complexity spatial filter, and show that techniques exploiting the space-time clustering demonstrate an improved detection performance. The comparison is done using signals transmitted by a moving transducer, and recorded on a 14-element non-uniform VLA in sea trials at distances of 46 km and 105 km.
Original languageEnglish
Pages (from-to)173-183
Number of pages11
JournalIEEE Journal of Oceanic Engineering
Publication statusPublished - Jan 2018

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  • OFDM
  • spatial filter
  • underwater acoustic communications
  • vertical linear array

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