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- W2096691772 abstract "Underwater acoustic communication link performance is investigated under strong time-frequency variation. A state of the art split-step parabolic equation program was used to generate channel responses under a moving rough sea surface. A shallow water environment with 47.5m depth at 1km range was considered, with the sea surface characterized as a mature sea under a 10m/s (at 10m height) wind. OFDM signal structure with a reasonable trade-off between symbol duration and subcarrier bin width is found to address only partially the severely overspread channel. It is found that beamforming at the transmitter and at the receiver significantly improves both coherence time and frequency, allowing doubling of the effective throughput. Further improvement of the rate is achieved through differential modulation which avoids training overhead. A link with 4 transmitters and 10 receivers was found to support 1.8 bps/Hz effective rate at 1km using differential modulation on each OFDM subcarrier, more than 4 times the corresponding rate of a 1×1 link using pilot-based estimation and non-differential modulation on each OFDM subcarrier." @default.
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- W2096691772 date "2010-05-01" @default.
- W2096691772 modified "2023-09-27" @default.
- W2096691772 title "Coherent and differential acoustic communication in shallow water using transmitter and receiver arrays" @default.
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- W2096691772 doi "https://doi.org/10.1109/oceanssyd.2010.5603913" @default.
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