Communications – electrical: acoustic wave systems and devices – Underwater system – Telemetering
Reexamination Certificate
2008-06-18
2010-12-28
Lobo, Ian J (Department: 3662)
Communications, electrical: acoustic wave systems and devices
Underwater system
Telemetering
Reexamination Certificate
active
07859944
ABSTRACT:
Advantageous OFDM-based underwater acoustic (UWA) apparatus, systems and methods are provided according to the present disclosure. In general, OFDM transmissions over UWA channels encounter frequency-dependent Doppler drifts that destroy the orthogonality among OFDM subcarriers. The disclosed apparatus, systems, and methods use a two-step approach to mitigate frequency-dependent Doppler drifts for zero-padded OFDM transmissions over fast-varying channels: (1) non-uniform Doppler compensation via resampling to convert a “wideband” problem into a “narrowband” problem; and (2) high-resolution uniform compensation on the residual Doppler. The disclosed apparatus, systems and methods are based on block-by-block processing and do not rely on channel dependence across OFDM blocks. Thus, the disclosed apparatus, systems and methods are advantageously applicable for fast-varying UWA channels.
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J. Kleider, et al.,
Freitag Lee
Li Baosheng
Stojanovic Milica
Willett Peter
Zhou Shengli
Lobo Ian J
Massachusetts Institute of Technology
McCarter & English LLP
University of Connecticut
Woods Hole Oceanographic Institution
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