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  • 1
    Electronic Resource
    Electronic Resource
    Active sonar detection in multipath: A New bispectral analysis approach (1994)
    Springer
    Circuits, systems and signal processing 13 (1994), S. 455-466 
    Details
    ISSN: 1531-5878
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Detecting active sonar returns in multipath media is a central underwater signal processing problem. This paper studies a new approach to active sonar detection using bispectral analysis of sonar data. Its sensitivity to non-stationarities is used to develop a threshold detector that can be applied to broad classes of signals and noise. Precise statistical descriptions of the underwater medium and noise are not required. Theoretical analyses predicting its performance as a function of signal-to-noise ratio and time-bandwidth product are presented. Computer simulation experiments verify the results and show that its performance compares favorably to that of conventional detectors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01183741
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    High speed implementation of certain adaptive filters: A novel Toeplitz matrix decomposition approach (1993)
    Springer
    Circuits, systems and signal processing 12 (1993), S. 495-502 
    Details
    ISSN: 1531-5878
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract We study implementation problems involved with certain adaptive filters requiring high speed matrix-vector multiplies of the formTw, whereT isn×n Toeplitz andw is ann×1 vector. We solve the problem using a novel and simple matrix decomposition of the formT=C+S, whereC is circulant and5 is “factor” circulant.C andS support fast Fourier transform implementations of all basic matrix computations. The decomposition can also be used to implement the productT 1 T 2 with fast Fourier transform algorithms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01188091
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Estimator-correlator array processing: Theoretical underpinnings and adaptive implementation (1991)
    Springer
    Multidimensional systems and signal processing 2 (1991), S. 55-68 
    Details
    ISSN: 1573-0824
    Keywords: estimator-correlator array processor ; canonical ; singular decomposition ; Karhunen-Loève ; expansion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract We develop a generalized singular value decomposition methodology for implementing the estimator-correlator array processor. The usefulness of this structure stems from two key properties examined in this paper. First, the structure is canonical, in that it applies to a broad class of underwater signal processing problems. Second, it is robust, not critically dependent on a precise characterization of the medium in question. Numerical simulation experiments justifying this claim are presented. Specific examples demonstrate the general implementation procedure. Although the results are computationally demanding, they can in large part be realized with parallel architectures. Hence, their implementation by dedicated processors is possible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01940472
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Expectations of useful complex Wishart forms (1994)
    Springer
    Multidimensional systems and signal processing 5 (1994), S. 263-279 
    Details
    ISSN: 1573-0824
    Keywords: Complex Wishart distributions ; complex Wishart forms ; complex multivariate statistics ; array processing ; adaptive beamforming
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Complex Wishart matrices are a key part of many multidimensional signal processing algorithms, and expectations of expressions containing them are needed to quantify their performance. In this paper we derive concise formulas forE{WAW},E{W −1 AW −1}, and other useful expressions, whereW follows the complex Wishart distribution andA is a deterministic matrix.A need not be symmetric. We show how the results can be used to quantify the performance of adaptive array processing algorithms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00980709
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    Paper (German National Licenses)
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  • 5
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    Seismic transient deconvolution with model‐based signal processing (1997)
    Society of Exploration Geophysicists
    Details
    Publication Date: 1997-07-01
    Print ISSN: 0016-8033
    Electronic ISSN: 1942-2156
    Topics: Geosciences , Physics
    Published by Society of Exploration Geophysicists
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    PAPER CURRENT
  • 6
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    Precision waveform shaping and precompensation for high data rate space coomunications systems (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper studies a memory-based pulse shaping and traveling wave tube precompensation technique applied to high data rate satellite communications. Baseband I and Q waveforms are synthesized from data stored in a distributed arithmetic architecture. The waveforms are adjusted to minimize intersymbol interference spectral bandwidth and traveling wave tube distortion. We evaluate its performance in a simulated bi-phase shift keying (BPSK) link. The results show that memory-based precompensation has great potential to improve link performance.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: International Journal of Satellite Communications (ISSN 0737-2884); 12; 2; p. 157-166
    Format: text
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    NASA TECHNICAL REPORTS
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