DIFFERENTIAL 16-ARY PHASE-AMPLITUDE MODULATION SCHEMES FOR DATA TRANSMISSION ON FADING CHANNELS (HF, SIMULATION).
Item
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Title
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DIFFERENTIAL 16-ARY PHASE-AMPLITUDE MODULATION SCHEMES FOR DATA TRANSMISSION ON FADING CHANNELS (HF, SIMULATION).
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Identifier
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AAI8409412
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identifier
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8409412
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Creator
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PAUW, CHRISTOFF KARL.
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Contributor
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D. 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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Three digital modulation formats for transmitting 4 bits per symbol on a fading channel are compared to one another and to binary DPSK. The results are applicable to Rayleigh fading channels in general, but parameters typical of the HF (ionosperic) radio channel were used when evaluting equations. The three schemes are normal 16-ary DPSK, differential phase-amplitude shift keying (DPASK) with 8 phases and 2 amplitudes, and DPASK with 8 phases, 2 amplitudes and an additional 22.5(DEGREES) phase shift between the two amplitude levels. Exact expressions for the probability of bit error were derived for the first two schemes, on both the AWGN and the slowly Rayleigh fading channels. The probability of bit error was also found by simulation for conditions of slow fading, fast fading, multipath time spread and additive Gaussian noise. Differential phase-amplitude shift keying was found to outperform 16-DPSK under most circumstances.;It is shown (by simulation only) that an optimum signaling rate (baud rate) exists for a given combination of fading rate and multipath time spread, and that the HF channel should be treated as a fast-fading channel for the three schemes involved here.;A simplified analysis leading to a special case of a previously published equation for the probability of bit error for binary DPSK on the fast-fading channel is presented and is used to validate the simulation of the fast-fading 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
