Hopfield neural networks proposed for demodulating quadrature phase-shift-keyed (QPSK) signals carrying digital information. Networks solve nonlinear integral equations prior demodulation circuits cannot solve. Consists of set of N operational amplifiers connected in parallel, with weighted feedback from output terminal of each amplifier to input terminals of other amplifiers. Used to solve signal processing problems. Implemented as analog very-large-scale integrated circuit that achieves rapid convergence. Alternatively, implemented as digital simulation of such circuit. Also used to improve phase estimation performance over that of phase-locked loop.


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    Title :

    Neural Networks For Demodulation Of Phase-Modulated Signals


    Contributors:

    Published in:

    Publication date :

    1995-12-01



    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English







    Linearization of Phase-Modulated Analog Optical Links Employing Interferometric Demodulation

    McKinney, J.D. / Colladay, K. / Williams, K.J. | British Library Online Contents | 2009


    Linearization of Phase-Modulated Analog Optical Links Employing Interferometric Demodulation

    McKinney, J.D. / Colladay, K. / Williams, K.J. | British Library Online Contents | 2009