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In this paper we report results from the Calibration and Communications Sea Trial 2010. We explain in detail the used cyclic-prefix orthogonal frequency division multiplexing (OFDM) signal design and adopted receiver processing, based on sparse channel estimation and intercarrier interference (ICI) equalization. We then focus on two phenomena that are not commonly treated in wireless communications...
Estimation of time-varying and sparse channels is a topic that has attracted considerable interest lately, especially for underwater acoustic communication. In the context of multicarrier transmission, several important questions remain unanswered: i) should pilots be placed in clusters as for time-varying, non-sparse channels, or randomly dispersed between the data as common in the Compressive Sensing...
Underwater acoustic (UWA) channels pose a significant challenge to multicarrier communication systems. Doppler effects necessitate short block lengths, so that the channel can be approximated as time-invariant, while large delay spreads require long guard intervals to prevent inter-symbol interference. Channel shortening can be used to alleviate this double bind by compressing the received channel...
While the frequency-selectivity of underwater acoustic channels motivates the use of orthogonal frequency division multiplexing (OFDM), the time-selectivity leads to large pilot overhead for channel estimation and Doppler effects that cause intercarrier interference (ICI). ICI can be estimated and mitigated using an appropriate channel model, but in turn leads to even further increased demand on pilot...
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