An analysis of ARQ and hybrid FEC-ARQ transmission over a meteor burst channel.
Item
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Title
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An analysis of ARQ and hybrid FEC-ARQ transmission over a meteor burst channel.
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Identifier
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AAI9000686
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identifier
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9000686
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Creator
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Djuknic, Goran M.
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Contributor
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Adviser: Donald L. Schilling
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Date
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1989
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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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Meteor burst channel is an intermittent channel, the time of its appearance and its duration are random variables. It is described in terms of stochastic parameters: meteor trail arrivals, electron line densities of underdense and overdense trails, and underdense power decay constant.;Two ARQ strategies, for point-to-point data transmission, were considered: "stop-and-wait", where one data packet is transmitted per burst, and "selective-repeat", where the entire burst duration is used for information transmission. In addition, ARQ is combined with forward error-correction, leading to a hybrid FEC-ARQ scheme. Using the probabilistic parameters, expressions were derived for ARQ system performance characteristics: throughput rate, message waiting time, and the probability of successful message delivery within some specified time. Performance measures are functions of communication system parameters, transmission protocol, packet size and transmission data rate. It is shown that in a stop-and-wait protocol there always exists an optimum packet size that maximizes the throughput, when data rate is kept fixed, and an optimum data rate that minimizes the message waiting time, when packet size is fixed. It is also shown that in both protocols coded transmission yields higher throughput, lower message waiting time, and increased probability of correct message reception, as compared to uncoded transmission, but only when code rate approaches to l. The coding employed was rate-l/n and k/n convolutional, with BPSK modulation.;We also estimated the channel duty cycle and channel capacity, the latter when meteor burst channel is regarded as a Gaussian channel and a binary-symmetric channel. They are functions of random channel parameters and communication system characteristics, and independent of the transmission protocol.
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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.
