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Global Telecommunications Conference, 1990, and Exhibition. 'Communications: Connecting the Future', GLOBECOM '90., IEEE

Date 2-5 Dec. 1990

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Displaying Results 1 - 25 of 376
  • GLOBECOM '90: IEEE Global Telecommunications Conference and Exhibition. 'Communications: Connecting the Future' (Cat. No.90CH2827-4)

    Publication Year: 1990
    Request permission for commercial reuse | PDF file iconPDF (1478 KB)
    Freely Available from IEEE
  • Scalability study of self-routing packet switch fabrics for very large scale broadband ISDN central offices

    Publication Year: 1990, Page(s):1609 - 1614 vol.3
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (604 KB)

    The authors examine the issues concerning the scalability of Batcher/banyan networks to architectures suitable for large broadband central offices. Their intent is to provide a first-round objective comparison of alternative switch architectures based on Batcher/banyan technologies which can provide 1 Tb/s of raw bandwidth. Scaling issues associated with large central office switching fabrics are ... View full abstract»

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  • A telepointing tool for distributed meeting systems

    Publication Year: 1990, Page(s):76 - 80 vol.1
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    In distributed real-time meeting systems that use personal computers, telepointing tools are used for showing a position in a shared space to remote machines. Telepointing tools are discussed from the network management perspective. A telepointing tool called the loosely coupled shared pointer is proposed. In a shared pointer approach, problems are (i) conflict between local operation and telepoin... View full abstract»

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  • Digital mobile radio switching system

    Publication Year: 1990, Page(s):485 - 489 vol.1
    Cited by:  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    A digital mobile communications system developed by NTT is described. This system offers various user services corresponding to ISDN services involving effective nonvoice services. It includes a nonvoice service adapter which converts modem output to baseband signals for transmission over narrowband digital radio links, and a hitless handover scheme which offers high-quality data communication ser... View full abstract»

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  • A multi-Rician fading model for radio communication systems

    Publication Year: 1990, Page(s):1227 - 1232 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    A multi-Rician fading model for radio communication systems in which the received signal consists of a finite number of specular components in addition to a diffuse component is presented. The probability density function of the envelope of the received signal is obtained from basic principles, and it is shown that, in some cases, the multi-Rician distribution gives fading which is deeper than Ray... View full abstract»

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  • A multi-purpose memory switch LSI for ATM-based systems

    Publication Year: 1990, Page(s):1602 - 1608 vol.3
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    The authors propose a switch for asynchronous transfer mode (ATM)-based systems and describe its LSI design and fabrication. The proposed switch, which is a memory switch with dynamic link speed control, can dynamically change link speeds according to traffic flow, thereby achieving high performance in any unbalanced traffic condition. The switch element also functions as a multiplexer/demultiplex... View full abstract»

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  • The FLEXCOM/linc system: a customer network reconfiguration system

    Publication Year: 1990, Page(s):72 - 75 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    A Bellcore software system that provides customer control of private network reconfigurations for networks consisting of digital cross-connect systems (DCSs) is discussed. The system, the FLEXCOM/linc system, and selected architecture objectives are reviewed. Two objectives are discussed: planning for independence from network element vendors and an integrated building block architecture approach ... View full abstract»

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  • Efficient design of trellis coded CPFSK

    Publication Year: 1990, Page(s):1999 - 2003 vol.3
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    A concept called matched encoding is applied to find the best combinations of rate-1/2 convolutional codes and continuous-phase frequency-shift keying (CPFSK). Binary CPFSK with a modulation index of 1/4 and quaternary CPFSK with modulation indices of 1/2 and 1/4 are considered. Combinations are optimized in the Euclidean distance sense for a given total number of states in the overall maximum lik... View full abstract»

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  • An optimized digital modem architecture for VLSI implementation

    Publication Year: 1990, Page(s):1691 - 1695 vol.3
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    Investigation into recently published research has uncovered a number of digital signal processing algorithms which have excellent performance characteristics and are well suited for VLSI implementation. The result of this investigative effort is an optimized modem signal processing architecture that is applicable to a variety of digital phase modulation schemes and that utilizes a combination of ... View full abstract»

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  • Data services in a TDMA digital portable radio system

    Publication Year: 1990, Page(s):480 - 484 vol.1
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (484 KB)

    Two kinds of data service are proposed: (1) a nonprotected data mode is provided for terminals which use an intelligent data link layer protocol and higher level protocols, where the radio link serves as a digital pipe similar to the physical layer in the OSI model; and (2) a protected data mode is provided for terminals which use simple start/stop flow control, where a radio link automatic repeat... View full abstract»

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  • A technique for minimum/nonminimum phase identification during multipath fading

    Publication Year: 1990, Page(s):1203 - 1208 vol.2
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    The use of an adaptive transversal equalizer at the receiver end of a digital radio receiver as a tool for identifying the phase of dispersive fading events is discussed. The identification is based on the online comparison of the equalizer precursor and postcursor taps and can be used without service disruption. It is shown that this method can be applied to dispersive fades with in-band notches ... View full abstract»

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  • A distributed modular tera-bit/sec ATM switch

    Publication Year: 1990, Page(s):1594 - 1601 vol.3
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    A simple distributed modular architecture for a very large scale ATM (asynchronous transfer mode) switch is proposed. By extending the concept of the original knockout switch, the cell filtering and contention resolution functions are distributed over many small switch elements, which are arranged in a cross-bar structure. The output ports of a switch fabric are partitioned into a number of groups... View full abstract»

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  • Queueing network modeling of signaling system No.7

    Publication Year: 1990, Page(s):552 - 558 vol.1
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    A queuing network model for the common channel signaling network signaling system No.7 (SS7) is formulated. The model is described by a number of generic descriptive parameters that are mapped into queuing network constructs, and takes into account the signaling connection control part (SCCP) and the various levels of the message transfer part (MTP). The various parameters take into account the ph... View full abstract»

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  • Coded partial response signalling with peak detection

    Publication Year: 1990, Page(s):1782 - 1786 vol.3
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    A form of coding which enables the combination of partial response equalization and peak detection is described. The equalization involves equalizing the magnetic recording channel to an extended class-IV partial response (EPR4) channel. The scheme increases the code rate at the expense of having to discriminate between two different types of peaks. The two types of peaks have different amplitudes... View full abstract»

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  • Migration of fault tolerant networks

    Publication Year: 1990, Page(s):65 - 71 vol.1
    Cited by:  Papers (4)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (500 KB)

    The migration from today's network to the restorable network of the future is discussed. Three categories of topologies are discussed in detail: dedicated (unidirectional, hybrid, or counter rotating) rings or route diversity; shared (bidirectional or reverse protection) rings; and mesh. Dedicated transport solutions are contrasted against general-purpose cross-connects with an emphasis on restora... View full abstract»

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  • Shaping gains using non-equiprobable signaling

    Publication Year: 1990, Page(s):1994 - 1998 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    The method presented by A.R. Calderbank and L.H. Ozarow (IEEE Trans. Inform. Theory, vol.36, p.726-40, July 1990) is extended to provide shape gains without resorting to high-dimensional constellations. The extended method accomplishes this by dividing the constellation into unequal sized constellations and then selecting these constellations on an equiprobable basis. This approach yields higher s... View full abstract»

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  • A multirate signal processing approach to block decision feedback equalization

    Publication Year: 1990, Page(s):1685 - 1690 vol.3
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    The author presents a method of implementing decision feedback equalization (or precoding) over a channel with intersymbol interference (ISI) when the input is a multiplexed version of several parallel input signals. The resultant scheme is a combination of prefiltering and postfiltering and scalar decision feedback equalization of a few of the input signals. As an interesting consequence of this ... View full abstract»

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  • Virtual sub-container multiplexing method for optical subscriber system

    Publication Year: 1990, Page(s):115 - 119 vol.1
    Cited by:  Papers (2)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    The path multiplexing architecture for optical subscriber systems that are constructed with synchronous transfer mode (STM) techniques is discussed. A novel concept, the virtual sub-container (VSC), is proposed to realize multiple network access. The VSC multiplexing method will make it possible to offer various services flexibly and inexpensively. Configuration of the digital service unit (DSU) b... View full abstract»

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  • Intelligent networking for digital cellular systems and the wireless world

    Publication Year: 1990, Page(s):475 - 479 vol.1
    Cited by:  Papers (3)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    Current trends in wireless and networking technologies are reviewed, and the benefits and potentials that can result from intelligent networks and services incorporating both technology trends are addressed. The transition from analog to digital cellular transmission in public systems to support increased subscriber densities and provide enhanced services, the low-powered microcellular systems whi... View full abstract»

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  • Computation of spectrally efficient pulse shapes in satellite communication

    Publication Year: 1990, Page(s):2056 - 2060 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    A numerical procedure for computing spectrally efficient pulse shapes is proposed. The time-bandwidth product of the spectrally efficient pulse that yields a nearly constant envelope in offset quadrature signaling is determined. The results are generalized to the case of energy efficiency in both the frequency and time domains, so that adjacent-channel interference can be traded against intersymbo... View full abstract»

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  • Physical design issues for very large ATM switching systems

    Publication Year: 1990, Page(s):1590 - 1593 vol.3
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    The authors examine several issues associated with the physical design of the very-high-throughput (terabit per second) packet switching systems that will be needed to provide ubiquitous broadband services. It is shown that conventional physical design alternatives do not scale well to the high data rates and complex connectivity needed to implement these systems. In particular, conventional inter... View full abstract»

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  • Intelligent transport network survivability: study of distributed and centralized control techniques using DCS and ADMs

    Publication Year: 1990, Page(s):1264 - 1268 vol.2
    Cited by:  Papers (3)  |  Patents (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    Evolving network topologies, their impact on network survivability, and a comparison of distributed and centralized control algorithms are discussed. It is shown that the concept of the new intelligent transport network is migrating towards the support of the SONET standards and the deployment of high-capacity optical fibers. LTEs, ADMs, and DCSs, and that the DCSs and add-drop multiplexers (ADMs)... View full abstract»

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  • A model for evaluation of switch architectures

    Publication Year: 1990, Page(s):547 - 551 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    Modeling tools are widely used in the design of communication switching fabrics, but are seldom used in the evaluation of these systems at a high level. A model called SAM (switching architecture model), which provides both architectural comparisons and traffic engineering at this level, is reported. The primary features of SAM are: it models multifabric switches that are capable of handling multi... View full abstract»

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  • Toward the intelligent integrated network management

    Publication Year: 1990, Page(s):1498 - 1502 vol.3
    Cited by:  Papers (1)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (532 KB)

    A general architecture for IINM (intelligent integrated network management) systems is proposed. In this architecture, an expert system is integrated into a management system to handle particularly difficult problems. The management system and expert system work interactively. The protocols and standards that have been adopted for the IINM system are also presented. It is concluded that an IINM sy... View full abstract»

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  • An energy- and bandwidth-efficient data transmission system for time-selective fading channels

    Publication Year: 1990, Page(s):1968 - 1972 vol.3
    Cited by:  Papers (3)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    The author investigates the use of smearing/desmearing filters in combination with linear modulation to achieve time diversity without bandwidth expansion in digital mobile radio systems. A low-complexity receiver structure for smeared data transmission in time-selective fading is described. The receiver is analyzed for perfect and noisy channel estimation and perfect interleaving. Results on the ... View full abstract»

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