Return to search

Direct-sequence spread-spectrum acoustic communications with CRV Decomposition

Approved for public release; distribution is unlimited. / Direct-Sequence Spread-Spectrum (DS-SS) is among the preferred modulation techniques for military applications. DS-SS offers three greatly desired characteristics. It allows for the development of Low Probability of Detection (LPD) and Low Probability of Intercept (LPI) systems and has a very good performance in fading channels. This thesis investigates the performance of the "Cross-Product RV (CRV) decomposition" as the basis of blind-equalization algorithms. The CRV is a rank-revealing decomposition alternative to the Eigenvalue Decomposition (EVD) that can provide a recursively updated estimate of the signal and noise subspace at a reduced computational cost. The CRV updating algorithm is implemented in MATLAB and evaluated in a previously proposed communication scheme intended for use in an underwater acoustic network called Seaweb. The underwater channel is modeled with the Monterey-Miami Parabolic Equation Model (MMPE) for various multipath perturbations. The receiver performance is examined using Monte Carlo simulation. Bit-error rates versus signal-to-noise ratio are presented for various, noise assumptions, and receiver synchronization assumptions. / Lieutenant, Hellenic Navy

Identiferoai:union.ndltd.org:nps.edu/oai:calhoun.nps.edu:10945/1613
Date06 1900
CreatorsAngelopoulos, Pavlos.
ContributorsCristi, Roberto, Smith, Kevin B., Naval Postgraduate School (U.S.)., Electrical and Computer Engineering
PublisherMonterey, California. Naval Postgraduate School
Source SetsNaval Postgraduate School
Detected LanguageEnglish
TypeThesis
Formatxviii, 95 p. : ill. (some col.) ;, application/pdf
RightsCopyright is reserved by the copyright owner.

Page generated in 0.0016 seconds