DOUBLE THRESHOLD ACQUISITION SCHEME IN FREQUENCY HOPPING SPREAD SPECTRUM.
Item
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Title
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DOUBLE THRESHOLD ACQUISITION SCHEME IN FREQUENCY HOPPING SPREAD SPECTRUM.
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Identifier
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AAI8409401
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identifier
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8409401
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Creator
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JIANG, QIANYI.
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Contributor
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Donald L. Schilling
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Date
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1984
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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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In this dissertation a double threshold acquisition scheme in frequency hopping spread spectrum is proposed and has been studied to minimize the mean acquisition time. The dissertation consists of two parts, in part one the acquisition scheme is applied to the nonfading channel, in part two the acquisition scheme is applied to the fading channel.;For the nonfading channel the equations to calculate the two thresholds are derived. The probability of false acquisition and dismissal are analyzed mathematically. The theoretical mean value of acquisition time is calculated. A computer simulation program of the communication system is used to determine the mean and the variance of acquisition time. The experiments are repeated more than 50 times to get the statistical value. The results of the experiments are coincident with the theory. The comparison among the single threshold scheme and the different double threshold schemes is made analytically and experimentally.;In the second part the double threshold acquisition scheme working in the fading channel has been studied. The signal in the fading channel has been analyzed by theoretical calculation and also been investigated by the experiments of simulation. The variance of the signal and the probability density function of the signal envelope in the fading channel are presented. The equations of the two thresholds are derived. The computer simulation is also done to determine the mean and the variance of acquisition time for the optimum P(,FA) and P(,D) and also for the different hopping rates. The results are compared with the nonfading channel.
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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.
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Program
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Electrical Engineering
