ON SOME ISSUES OF CODE DIVISION MULTIPLE ACCESS COMMUNICATION.
Item
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Title
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ON SOME ISSUES OF CODE DIVISION MULTIPLE ACCESS COMMUNICATION.
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Identifier
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AAI8629694
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identifier
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8629694
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Creator
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GELMAN, ALEXANDER DAVID.
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Contributor
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Donald L. Schilling
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Date
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1986
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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 solution to Asynchronous Multiple User Real Time Communications is proposed. That is to employ Spread Spectrum Signaling technique and Code Division Multiplexing of multiple user signals into a Fiber Optic medium.;Direct Sequence, Time-Hopped, Color-Hopped and Hybrid (Time/Color-Hopped) signaling schemes are analyzed and the probability of error is determined as a function of employed codes' parameters and the channel traffic.;The assumptions for channel models are Poisson arrivals of multiple user signals and hard limiting of the composite channel signal.;It is shown that Probability of Error of 10('-5) can be achieved at 22% channel load for systems with Passive Pause signaling and at 10% for systems with Active Pause Signaling.;As the number of active users increases the channels demonstrate graceful performance degradation in terms of the probability of error.;A presence of optimal code sizes has been demonstrated for all signaling schemes and it has been shown that this optimum is a function of the channel load.;It has been determined that in a hybrid, Time/Color-Hopped system Trade off is possible of the Electronic Bandwidth expansion for Optical and vice-versa. Synchronization Algorithms for Time-Hopped Code Division Multiple Access Systems are proposed and expressions for False Acquisition Probability and Average False Tracking Time are derived.;Two typical applications of the proposed signaling techniques to Rate-Invariant Signals Multiplexing and to Local Area Networking are described.
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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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Engineering
