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In this work we review Filtered Multitone modulation (FMT) for underwater communications. This multicarrier modulation splits the transmission across several sub-bands with high spectral containment, and may be thought of as a hybrid between the widely popular single-carrier and OFDM schemes. As in OFDM the receiver architecture is conceptually based on a bank of filters, but in our envisaged scenarios...
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...
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