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International Zurich Seminar on Digital Communications, Electronic Circuits and Systems for Communications.

5-8 March 1990

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Displaying Results 1 - 25 of 37
  • Advanced VLSI technology and design techniques for future telecom systems

    Publication Year: 1990, Page(s):3 - 26
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (517 KB)

    The impact of the introduction of telecommunication products, such as next-generation switching systems, optical transmission, and digital cellular radio, on VLSI technology and design methodology is discussed. It is shown how design concepts, supported by appropriate CAD (computer-aided design) tools, can make designs of complexities of up to 700000 transistors with operating frequencies of up to... View full abstract»

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  • An all-digital audioconference system

    Publication Year: 1990, Page(s):163 - 172
    Cited by:  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (393 KB)

    An all-digital audioconference bridge based on a four-wire network connection has been implemented. The audioconference bridge is implemented as a wire-wrap plug-in board to a digital exchange on a 2.048 Mb/s 32-channel PCM (pulse code modulation) link. The digital system is superior to the existing analog audioconference systems both in terms of setup time and quality of transmission. A general b... View full abstract»

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  • 1990 International Zurich Seminar on Digital Communications. Electronic Circuits and Systems for Communications. Proceedings (Cat. No.90TH0305-3)

    Publication Year: 1990
    Request permission for commercial reuse | PDF file iconPDF (15 KB)
    Freely Available from IEEE
  • Cell alignment in ATM systems via header error check: performance evaluation and hardware considerations

    Publication Year: 1990, Page(s):115 - 130
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    Cell synchronization for an asynchronous transfer mode (ATM) system via header error check is discussed, and a possible hardware implementation is given. For a performance evaluation the essential parameters are average cell loss and mean block length of the consecutively lost cells. For these parameters, formulae, or at least lower and upper bounds in closed form, are derived. The derivation is b... View full abstract»

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  • A novel memory controller for an ATM switch

    Publication Year: 1990, Page(s):103 - 114
    Cited by:  Papers (6)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    The authors discuss some general approaches to ATM (asynchronous transfer mode) switching architectures, namely, common memory switches, Banyan networks, switch matrices, and bus-based time switches from a traffic behavior and implementation viewpoint. They focus on a novel controller hardware for the common memory type, which implements FIFO (first-in first-out) mechanisms as linked lists in hard... View full abstract»

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  • M-ary continuous phase frequency shift keying transmissions through nonlinear channels in additive Gaussian noise and cochannel interferences

    Publication Year: 1990, Page(s):495 - 511
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    The problem of evaluating the performance of M-ary continuous-phase frequency shift keying (CPFSK) signals transmitted through an arbitrary bandpass nonlinearity (BPNL) in the presence of additive Gaussian noise (AGN) and cochannel interference (CCI) is considered. The proposed nonlinear channels are two-link satellite channels. The satellite system consists of a ground transmitter, a sat... View full abstract»

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  • Architecture and technology for a flexible ATM switch element and network

    Publication Year: 1990, Page(s):87 - 102
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    The principle of an asynchronous transfer mode (ATM) switch characterized by a high degree of flexibility is described. The flexibility is given with respect to cell length and traffic. In the case of a very long or an infinite length of cells, quasi-permanent connections with constant capacity can be switched. The principle is based on splitting of cells into a sequence of fractions of cells whic... View full abstract»

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  • On MMSE timing recovery using oversampling

    Publication Year: 1990, Page(s):474 - 494
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    The realization of stochastic gradient MMSE (minimum mean square error) time recovery algorithms for digital receivers is analyzed and discussed in the framework of the hypothesis of oversampling the received signal with respect to synchronous sampling. It is shown that very simple and effective algorithms, especially suitable for digital implementation, are possible. A convergence analysis based ... View full abstract»

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  • All-digital synchronizers for DPSK demodulators

    Publication Year: 1990, Page(s):268 - 283
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    Maximum a posteriori (MAP) and data transition tracking loop (DTTL) synchronizers are developed for the differential phase shift keying (DPSK) scheme. In their original form, these synchronizers require substantial hardware for their realization. By some simplifications, hardware complexity can be considerably reduced. Simplified all-digital MAP and DTTL synchronizers are suggested. The hardware n... View full abstract»

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  • Realization of broadband data services in ATM-networks

    Publication Year: 1990, Page(s):73 - 86
    Cited by:  Papers (1)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (548 KB)

    It is pointed out that broadband data services are expected to play an important role in the future B-ISDN (broadband integrated services digital network) which will be based on the ATM (asynchronous transfer mode) transmission technique. The authors first describe some significant broadband data applications. They then focus on the realization of broadband LAN (local area network) interconnection... View full abstract»

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  • On the interaction between DSP-algorithms and VLSI-architecture

    Publication Year: 1990, Page(s):219 - 230
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    The interaction between DSP (digital signal processing) algorithms and VLSI architecture is addressed, and it is shown at which levels architecture analysis has to be undertaken and at which levels new possibilities can be exploited. It is noted that the new possibilities of implementing algorithms and even complex systems on dedicated chips lead to the necessity of undertaking a careful analysis ... View full abstract»

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  • All-digital pseudo-coherent (PC) FSK modems

    Publication Year: 1990, Page(s):463 - 473
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    A detailed study of the PC (pseudocoherent) and DID (double-integrate-and-dump) FSK (frequency shift keying) demodulators by computer simulation is presented. In addition, the hardware realization of the demodulators is described. It is shown that both demodulators perform nearly as well as the coherent schemes. They are also both basically suitable for realizing a VLSI for FSK modems. Typical sil... View full abstract»

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  • Chip-size and power consumption of ASICs and digital signal processors for low-power signal-processing

    Publication Year: 1990, Page(s):256 - 267
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (452 KB)

    Signal-processing in battery-powered telecommunication equipment such as cordless telephone or radiotelephone can be done using a standard DSP (digital signal processor), a hardwired digital ASIC (application-specific integrated circuit) or an SC-circuit. Whether one of these alternatives is useful and advantageous for a particular application is determined by its cost and power consumption. A sim... View full abstract»

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  • The concept of virtual paths and virtual channels in ATM-networks

    Publication Year: 1990, Page(s):63 - 72
    Cited by:  Patents (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    Problems which relate to the realization of an asynchronous transfer mode (ATM) network are described with particular emphasis on the subscriber access to the network, ATM connections, and switching of the ATM cells. A connection can be established either on the basis of a virtual channel or of a virtual path. To do the routing, translation of the virtual channel identifier (VCI) and the virtual p... View full abstract»

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  • VLSI techniques for the communication market

    Publication Year: 1990, Page(s):211 - 216
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    Specific problems related to large-scale integration in the communication market are discussed. It is pointed out that the influence of integrated-circuit technology in the past few years has been pervasive, in areas from consumer products to business management to manufacturing control. It is noted that, in order to survive, it is necessary to have an optimal cost efficiency for the products. Thi... View full abstract»

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  • Exploitation of redundancy for throughput increase in a high speed LAN

    Publication Year: 1990, Page(s):433 - 462
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (636 KB)

    Different techniques for improving the exploitation of resources in a high-speed local area network (LAN) are assessed. The techniques analyzed are all based on the exploitation of the redundant resources often introduced in the transmission system to increase the network's fault tolerance. The different strategies are defined for a 100-Mb/s token ring LAN. In order to assess the different strateg... View full abstract»

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  • Quadrature mixer imbalances in digital TDMA mobile radio receivers

    Publication Year: 1990, Page(s):147 - 162
    Cited by:  Papers (27)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (532 KB)

    The impact of imbalances in nonperfect quadrature mixing stages on the performance of a TDMA (time-division multiple-access) mobile radio receiver with adaptive Viterbi-MLSE (maximum-likelihood sequence estimation) equalization is studied. Amplitude and phase imbalances in quadrature mixers give rise to nonlinear signal distortions which can be described using a simple mirror signal model. The mir... View full abstract»

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  • Towards a special multitasking microprocessor for public-network telecom applications

    Publication Year: 1990, Page(s):243 - 255
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (796 KB)

    The multitasking support of some of the most advanced of today's microprocessors is investigated in order to derive design directives for a special microprocessor architecture devoted to applications in public network telecom systems. The brands selected are the INMOS transputer, the VL86C020 Acorn RISC (reduced instruction set computer) Machine (ARM) manufactured by VLSI Technology, and Intel's i... View full abstract»

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  • A multichannel optical network

    Publication Year: 1990, Page(s):306 - 320
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    The performance of a network based on an optical star is discussed. Destination nodes are addressed by directly sending the information on the channel reserved to that node. Simulation of the network shows that the throughput-delay characteristic is dramatically affected by the output capabilities of the network nodes, i.e., by the number of packets they can simultaneously send. In particular, nod... View full abstract»

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  • Scalable architecture for large scale switching network

    Publication Year: 1990, Page(s):352 - 362
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (612 KB)

    An alternative approach to constructing a scalable broadband communication switch, based on a three-dimensional mesh topology, is described. It is motivated by the recognition that large-scale switching structures are wire limited; the complexity of what can be physically implemented is limited by its total wiring complexity. By analyzing the communication requirements of a switching network, the ... View full abstract»

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  • Subscriber loop components for the Basel communication system B-ISDN field trial

    Publication Year: 1990, Page(s):47 - 60
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    The authors outline the Basle-based field trial BASKOM and give a system description showing the structure and functions of the broadband integrated services digital network (B-ISDN) switching and transmission system. Besides full ISDN capability, the network supports broadband (140 Mb/s) dialogue and retrieval services. Comprehensive terminal equipment for optimal accommodation of user requiremen... View full abstract»

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  • A Bi-CMOS ATM switching LSIC

    Publication Year: 1990, Page(s):195 - 210
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    An IC designed for a high-speed broadband ISDN switching system is described. The IC was fabricated using a BiCMOS RAM and logic gate array. The IC has functions for cell buffering, switching, and VCI conversion. It features a pipeline configuration and a high-speed ECL (emitter coupled logic) interface for a throughput of 1.2 Gbit/s. Tests confirmed accurate switching. Using this IC, an ATM (asyn... View full abstract»

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  • Design of an enhanced FDDI-II system

    Publication Year: 1990, Page(s):418 - 432
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (580 KB)

    It is pointed out that the growing demand for more bandwidth and integrated telecommunication services in the customer premises area can be satisfied with the hybrid high-speed local area network FDDI-II (fiber distributed data interface). A hardware design based on existing highly integrated components for the FDDI protocol is presented. The design contains all features according to the proposed ... View full abstract»

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  • The policing function in an ATM network

    Publication Year: 1990, Page(s):131 - 144
    Cited by:  Papers (16)  |  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    The gabarit policing function, based on the mean and the standard deviation of a source's Gaussian envelope, is developed to optimally exploit the statistical multiplexing gain for VBR (variable bit rate) sources by guaranteeing not only the negotiated mean cell rate but also the negotiated variance for the policed connection. The parameters of the gabarit policing function can directly be used by... View full abstract»

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  • Procedure to align octets in broadband applications using chips in homogeneous technology

    Publication Year: 1990, Page(s):284 - 291
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    A method for synchronization of broadband bit streams is described. It provides: alignment of octets in one step, avoiding shift operations in the serial-parallel conversion; cell delineation; shortest resynchronization time; and easy board layout by avoiding timing constraints. The method provides the best synchronization performance for ATM (asynchronous transfer mode) applications View full abstract»

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