New mobile cellular systems.
Item
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Title
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New mobile cellular systems.
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Identifier
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AAI9521276
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identifier
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9521276
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Creator
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Hadad, Zion.
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Contributor
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Adviser: Donald L. Schilling
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Date
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1995
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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 research two types of Spread Spectrum Code Division Multiple Access (CDMA) systems are proposed and considered. Direct Sequence Broadband Code Division Multiple Access (B-CDMA) in an Overlay application and a Frequency Hopping Code Division Multiple Access (FH-CDMA) technique are presented.;The Overlay B-CDMA (O-B-CDMA) signal can overlay the existing cellular telephone spectrum (825 to 894 MHz) thereby providing additional capacity to the network. This method allows high quality voice and high speed data services to coexist with the existing cellular services: Advanced Mobile Phone System (AMPS) and Time Division Multiple Access (TDMA). The low level of mutual interference experienced between the existing cellular telephone system and the B-CDMA overlay system is shown. This approach has been proven successful by actual field testing in Des Moines, Iowa. A minimal system was used for the field test. The B system consisted of a single base station, equipped with a receive notch filter, four remote units working simultaneously, each at a data rate of 64 Kbps, overlaying 40 AMPS users and surrounded by other AMPS cells. The tested system did not include any type of diversity (spatial, RAKE, or hand-off of any kind, etc.).;This research also includes an analysis of a FH-CDMA system that performs in either a clear band of frequencies or as an overlay. The proposed FH system includes a six sectored base station, maximal ratio diversity combining at the base, switching diversity at the base toward the remote is assumed, and a six ring topology for efficient area coverage. The system also uses Reed-Solomon Forward Error Correcting Code with erasure decoding.;This research also includes a new approach for the rejection of narrow band interference. This has been simulated, implemented, and successfully tested.
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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.
