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Pilot-Tone Based ZP-OFDM Demodulation for an Underwater Acoustic Channel

Overview Existing coherent underwater acoustic communication systems rely on single carrier transmission and adaptive decision feedback equalization to deal with time-varying and highly dispersive UnderWater Acoustic (UWA) channels. Equalization complexity prevents any substantial rate improvement with the existing single-carrier approach, as the channel frequency selectivity increases considerably when the symbol rate increases. Multicarrier modulation in the form of Orthogonal Frequency Division Multiplexing (OFDM), on the other hand, converts a frequency selective channel into a set of parallel frequency-flat subchannels, thus greatly simplifying receiver equalization. Motivated by the success of OFDM in radio channels, the paper investigates its use for underwater acoustic channels. This paper develops a pilot-tone based receiver design for zero-padded OFDM transmissions, and test it in a real underwater acoustic channel.

Further White Paper Details
Publisher	University of Connecticut	File Format	PDF
Date Published	July 2006
Format	White Papers
Topics	Wireless LAN, Parallel Processing, Mobile - Wireless Communications

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