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Performance of acoustic spread-spectrum signaling in simulated ocean channels

Approved for public release, distribution is unlimited / Direct-Sequence Spread Spectrum (DSSS) modulation is being advanced as the physical-layer basis for Seaweb undersea acoustic networking. DSSS meets the need for channel tolerance, transmission security, and multi-user access. This thesis investigates the performance of subspace-decomposition blind-equalization algorithms as alternatives to RAKE processing of DSSS signals. This approach is tailored for superior performance in time-dispersive and frequency-dispersive channels characteristic of ocean acoustic propagation. Transmitter and receiver structures are implemented in Matlab and evaluated with a statistics-based model of a doubly spread channel with additive noise. Receiver performance is examined using Monte Carlo simulation. Biterror rates versus signal-to-noise ratio are presented for various multipath assumptions, noise assumptions, and receiver synchronization assumptions. / Lieutenant, Hellenic Navy

Identiferoai:union.ndltd.org:nps.edu/oai:calhoun.nps.edu:10945/934
Date06 1900
CreatorsPelekanos, Georgios N.
ContributorsCristi, Roberto, Rice, Joseph, Naval Postgraduate School (U.S.), Department of Electrical and Computer Engineering, Engineering Acoustics Academic Committee
PublisherMonterey, California. Naval Postgraduate School
Source SetsNaval Postgraduate School
Detected LanguageEnglish
TypeThesis
Formatxiv, 109 p. : ill. (some col.), application/pdf
RightsCopyright is reserved by copyright owner

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