Propagation modeling and measurements of a direct sequence spread spectrum signal at 1.956 GHz for mobile communications.
Item
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Title
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Propagation modeling and measurements of a direct sequence spread spectrum signal at 1.956 GHz for mobile communications.
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Identifier
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AAI9304656
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identifier
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9304656
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Creator
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Erceg, Vinko.
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Contributor
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Adviser: Donald L. Schilling
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Date
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1992
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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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The demand for increasing capacity in personal communication systems requires the use of smaller cells (microcells). The emitted power when using microcells will be of the order of milliwatts and the size of the microcells will be about 200 m. Therefore, accurate signal strength predictions become crucial when hand-off, power control, and cell planning are considered to minimize intercell interference. An accurate service-area prediction is necessary to design urban area base station layouts for microcells, and such design should be based on an understanding of the radio propagation characteristics. In this thesis the line-of-sight (LOS) and the out-of-sight propagation models based on theory and experiments were proposed. The measurements were performed for the line-of-sight and out-of-sight conditions in rural, suburban, and urban environments. In the LOS case, propagation path loss can be characterized by two slopes and a single breakpoint. The path loss along the out-of-sight streets was found to have two distinct characteristics: The first is a sudden power level drop (corner attenuation) and the second is a difference slope (attenuation vs. distance) which follows the sudden corner attenuation.
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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.
