Optimum processing of multilevel narrow-band digital FM utilizing noncoherent FM demodulation.
Item
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Title
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Optimum processing of multilevel narrow-band digital FM utilizing noncoherent FM demodulation.
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Identifier
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AAI9218224
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identifier
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9218224
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Creator
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Bolourchi, Nader.
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Contributor
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Adviser: Donald L. Schilling
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Date
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1992
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Language
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English
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Publisher
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City University of New York.
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Subject
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Engineering, Electronics and Electrical
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Abstract
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A new technique for the detection of narrow-band multilevel continuous phase frequency shift keyed (CPMFSK) signals is described to attain spectral efficiencies in excess of 2 bits/s/Hz. This method is a noncoherent demodulation which utilizes a limiter-discriminator-integrator (LDI) followed by a nonlinear postprocessor to combat the intersymbol interference caused by the predemodulation IF filter. The approach taken is to obtain an expression for the frequency output of the demodulator and then to determine the required thresholds as specified by the past history of the signal. This problem has not been addressed in the literature.;The error rate performance is computed for this receiver, both with and without postprocessor as a function of various system parameters, to support the superiority of this algorithm. Quantitative results are presented for the case of additive Gaussian noise. Computer simulation results show significant improvement in the bit error probability (BER) at high SNR as well as at low SNR.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
