Performance evaluation and dejittering for the transport of multimedia traffic over ATM networks.
Item
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Title
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Performance evaluation and dejittering for the transport of multimedia traffic over ATM networks.
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Identifier
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AAI9924852
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identifier
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9924852
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Creator
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Shuaib, Khaled Ali.
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Contributor
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Adviser: Tarek N. Saadawi
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Date
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1999
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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 work we evaluate the performance of AAL5 in transporting MPEG-2 streams. In the case of AAL5, the consequences of using the CRC and Length fields of the CPCS PDU Trailer for error detection on the perceptually received video quality are observed. A new cell loss padding technique is proposed, which takes advantage of the Length field in the case of AAL5 to conceal the impact of cell losses. The proposed technique is based on passing the incomplete PDUs and the Length field to the decoder TS layer or to an AAL-SSCS where parsing and padding is performed based on the available information and the kind of incomplete TS packet. The sensitivity of MPEG-2 Transport Stream packet types to communication network impairments specifically bit errors and data loss, is observed and evaluated. Through an intensive experimental study, the characteristics of CDV and CTD in an ATM network transporting CBR traffic under diverse operating conditions are evaluated. We examine the effect of changing network parameters, such as the number of nodes and background load conditions, on the performance parameters of both CDV and CTD. Our results revealed the distributions of CTD and CDV could not be fit into any of the standard distributions (such as normal, gamma,...etc.). The results also present the auto-correlation behavior of CTD as a function of both load and number of traveled hops. Also presented a verification study of the Square Root Law (SRL) the ATM FORUM proposed to estimate the standard deviation of the CTD for a multi node network. In addition, this work includes a de-jittering scheme, which can be used in the transport of MPEG-4, and MPEG-2 video to absorb any introduced network jitter is proposed. The essence of the de-jittering scheme is based on the statistical approximation of delay variation in the arrival times of video packets carrying encoded clock reference values and a filtering and re-stamping mechanism.
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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.
