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IEEE Global Telecommunications Conference and Exhibition. Communications for the Information Age

Nov. 28 1988-Dec. 1 1988

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Displaying Results 1 - 25 of 331
  • GLOBECOM '88. IEEE Global Telecommunications Conference and Exhibition - Communications for the Information Age. Conference Record (IEEE Cat. No.88CH2535-3)

    Publication Year: 1988
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    Freely Available from IEEE
  • Virtual-circuit load control in fast packet-switched broadband networks

    Publication Year: 1988, Page(s):214 - 220 vol.1
    Cited by:  Papers (27)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (478 KB)

    The authors consider the bandwidth management issues in a congestion control framework proposed for fast packet-switched broadband networks. Specifically, they study a simple threshold-based strategy where the threshold parameters are determined so as to minimize a weighted sum of call blocking probabilities while providing a required GOS (grade of service) in terms of blocking performance to each... View full abstract»

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  • First application of the generic network-element memory-administration interface for digital crossconnect systems

    Publication Year: 1988, Page(s):347 - 352 vol.1
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    The authors present the key aspects of the first application of the generic network element memory administration (NEMA) interface for digital crossconnect systems (DCs). They focus on those portions of the memories embedded in an NE that can be accessed and controlled through the operations interface (i.e. the NE database). DSO crossconnects, conference establishment, and conference crossconnects... View full abstract»

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  • A compatible fixed-frame ISDN gateway for broadband metropolitan area networks

    Publication Year: 1988, Page(s):1260 - 1265 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (459 KB)

    A novel method (referred to as I-SWIFT) is presented for integrating the flow of synchronous voice streams into existing broadband cable systems using CATV (community antenna television) technology. The interface between the integrated voice subnetwork and the cable system is realized by a metropolitan area gateway (MAG) which is implemented at the broadband cable head-end. An intelligent scheduli... View full abstract»

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  • An approach to user requirements-oriented flow control

    Publication Year: 1988, Page(s):1663 - 1667 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    A flow control algorithm for virtual circuits is proposed which takes into account the fact that in a packet switched network, different users can have different requirements for throughput and average delay. The algorithm is based on a new definition of power based on multiple objective optimization theory. Problems of approximation and convergence are discussed, and a numerical example is given.... View full abstract»

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  • Vector excitation coding with dynamic bit allocation

    Publication Year: 1988, Page(s):290 - 294 vol.1
    Cited by:  Papers (7)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    Vector excitation coding (VXC) has shown promise for digital transmission of fairly high communications quality speech at low bit rates, but current versions of the algorithm still suffer from audible degradations, particularly at 4.8 kb/s. The authors examine the technique of dynamic bit allocation (DBA) to improve the performance of VXC for a given bit rate. The approach is based on the observat... View full abstract»

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  • LPC excitation based on zinc function decomposition

    Publication Year: 1988, Page(s):285 - 289 vol.1
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    The quality of low-bit-rate speech using linear prediction is largely dependent on the model used for the excitation signal. The authors propose a linear predictive coding (LPC) excitation model composed of a set of orthogonal functions called zinc functions, which are well-suited for modeling the LPC residual signal. The zinc basis functions are used in a low-bit-rate, multiphase LPC speech-codin... View full abstract»

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  • A simplified method for RPE coding with improved performance

    Publication Year: 1988, Page(s):280 - 284 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    The regular-pulse-excitation (RPE) technique for speech coding gives good speech quality, but requires a heavy computational effort. A method for the excitation sequence search is proposed in which the pulse amplitudes are computed one at a time, rather than simultaneously in block, by solving a linear system of reduced dimension. The algorithm also provides an appreciable improvement in the perfo... View full abstract»

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  • Towards flexible operations communications for switched multi-megabit data service

    Publication Year: 1988, Page(s):179 - 183 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    The authors discuss operations systems (OS) to network element (NE) communications to support switched multimegabit data service (SMDS), a proposed connectionless service concept that will permit a telephone company to meet emerging customer demand for high-speed data communications within a metropolitan area. SMDS will initially be supported by NEs based on metropolitan area network (MAN) technol... View full abstract»

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  • A vector ADPCM analysis-by-synthesis configuration for 16 kbit/s speech coding

    Publication Year: 1988, Page(s):275 - 279 vol.1
    Cited by:  Papers (11)  |  Patents (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    A speech-coding algorithm based on the introduction of a vector quantizer into an ADPCM (adaptive differential pulse code modulation) configuration is presented. This vector ADPCM (VADPCM) algorithm is directed toward low-complexity, low-delay (0-5 ms), 16-kb/s applications. An analysis-by-synthesis configuration is used to allow the vector quantizer to operate with the usual scalar linear predict... View full abstract»

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  • Simulation tools for computer communication networks

    Publication Year: 1988, Page(s):1702 - 1706 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    The authors consider the issues related to the development of computer-aided analysis and design (CAAD) tools for computer communication networks. They describe a step-by-step procedure to develop a simulation tool and present a checklist of parameters that a computer network CAAD tool should have as a part of its output. Various methods of obtaining confidence intervals and their pros and cons ar... View full abstract»

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  • Software requirements for very high bandwidth communications

    Publication Year: 1988
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (88 KB)

    Discusses the impact of very high bandwidth communications on the researchers and developers of the related communications software and protocols. He notes that future technology will make it possible to transmit information at rates in excess of 1.7 Gb/s, at bit error rates ranging from 10-14 to 10-28, with the utilization of very large real storage (in excess of hundreds of... View full abstract»

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  • Some pragmatic issues about TMNs: X.25 based DCNs and gateway functions towards external computer networks

    Publication Year: 1988, Page(s):174 - 178 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    A proposal is outlined for the implementation of TMN DCNs (telecommunication management network data communications networks) based on X.25 packet switched data networks. The authors analyze the requirements and nature of gateway functions to be placed on TMNs to allow them to communicate with external computers such as those used by the telecommunication operating companies for their subscribers ... View full abstract»

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  • Voiceband data compression at 16 kb/s

    Publication Year: 1988, Page(s):270 - 274 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    The effects of waveform coding on voiceband data are explored. In particular, voiceband data compression at 16 kb/s is considered, and the performance and attributes of several 16 kb/s compression algorithms (APC, ATC, CELPC, PCM, SBC, and VQ) are discussed. Three mechanisms for improving performance are noted: decreasing the error variance, increasing the correlation between signal and error, and... View full abstract»

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  • PLANNER, the network services planning tool

    Publication Year: 1988, Page(s):1697 - 1701 vol.3
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    PLANNER, a network services planning tool, is a prototype expert system that assists in network performance analysis by determining call setup signalling under various conditions specified by the user. The authors provide an overview of PLANNER; describe the project objectives, the knowledge-based methodology and design used, and the implementation of planner; and discuss future applications. Give... View full abstract»

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  • Telecommunications software development: today and tomorrow

    Publication Year: 1988, Page(s):730 - 734 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    Discusses the evolution of telecommunication networks and environmental changes in telecommunications software development. Present and future telecommunications software technologies are then overviewed with a focus on software reuse, automated development environments, and quality control. Finally, a three-level intelligent software network is proposed. It is concluded that cooperation between t... View full abstract»

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  • Communications protocols for operations administration and maintenance

    Publication Year: 1988, Page(s):168 - 173 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    Ways to meet the requirements of public carriers for communications protocols to support operations, administration and maintenance (OA&M) are investigated. General carrier requirements to achieve effective integration of equipment control and monitoring in a multivendor environment are identified. These requirements are examined in terms of their impact on the design, specification, and appli... View full abstract»

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  • Comparative study of modulation techniques for microwave digital radios

    Publication Year: 1988, Page(s):265 - 269 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    A comparative study is presented showing the relative merits of four modulation techniques for use in line-of-sight digital radio systems operating at 45 Mb/s in a bandwidth of 10 MHz. The candidate modulations are conventional 64-QAM (quadrature amplitude modulation), reduced-bandwidth 16-QAM, reduced-bandwidth 49-QPRS (quadrature partial-response signaling), and conventional 81-QPRS. Comparisons... View full abstract»

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  • CAPSIM: a graphical simulation tool for communication systems

    Publication Year: 1988, Page(s):1692 - 1696 vol.3
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    The authors describe the design, operation, and capabilities of CAPSIM (capture and simulate), a complete interactive simulation environment for design and analysis of communication systems. The integrated environment includes the capability to design models, subsystems, and systems in a hierarchical fashion using block diagrams (icons), configure and execute a simulation; review the results of th... View full abstract»

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  • Next generation software techniques

    Publication Year: 1988, Page(s):726 - 729 vol.2
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    Describes three technologies that have improved the productivity of large software development teams in a significant way. The first is a powerful product administration system (SABLE) that permits changes throughout the product life cycle to be controlled and the pieces of the system to be put together efficiently and effectively. The second technology is an architecture which serves as the basis... View full abstract»

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  • A comparison of synchronous and fractional-spaced DFEs in a multipath fading environment

    Publication Year: 1988, Page(s):1452 - 1456 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    The ability of a 6-tap decision feedback equalizer (3 forward, 3 backward) to combat multipath fading in a digital microwave environment is compared with that of an 8-tap (5 forward, 3 backward) fractionally spaced DFE. The tap spacings of the forward part are at T/2. The lengths are chosen to span the same time interval. The ability of the equalizers to combat multipath fading is estimat... View full abstract»

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  • Generic building blocks for the telecommunications management network

    Publication Year: 1988, Page(s):163 - 167 vol.1
    Cited by:  Papers (1)  |  Patents (28)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    The TMN (telecommunications management network) is envisioned as an approach for interconnecting the network elements with the operations systems. The generic TMN is planned to be built with embedded operations channels now made available by the data links within ESF and SONET, SS7 signaling links, and dedicated channels. The concept of mediation is briefly reviewed. Three levels of mediation are ... View full abstract»

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  • The Bellcore Reliability Prediction Procedure (RPP); 1988 edition

    Publication Year: 1988, Page(s):70 - 76 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    The authors describe the 1988 edition of the Bellcore Reliability Prediction Procedure for electronic equipment (RPP), with particular emphasis on additions and improvements incorporated in the last four year. They also describe a software system developed by Bellcore to mechanize generation of RPP predictions. The RPP and its automated version, the ARPP, include formulas for both steady-state and... View full abstract»

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  • An analytical model to describe the performance of digital radio links

    Publication Year: 1988, Page(s):260 - 264 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    The author describes an analytical tool capable of predicting the average bit error rate (BER), the percent error-free seconds (PEFS), and the availability for an end-to-end digital connection. Availability is defined with respect to the hypothetical reference link (HRX). A connection is considered to be in an unavailable state if the BER is worse than 10-3 10 consecutive 1-s intervals ... View full abstract»

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  • COEDS: a CAAD tool for shipboard communication system engineering

    Publication Year: 1988, Page(s):1685 - 1691 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (452 KB)

    The authors describe COEDS (communication engineering design system), a new CAAD (computer-aided analysis and design) tool developed for shipboard communication systems. COEDS aids in EMI (electromagnetic interference) analysis, system degradation prediction, and interference mitigation. COEDS tools are used to build block diagrams of communication systems, calculate power and frequency of cosite ... View full abstract»

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