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IEE Proceedings I - Communications, Speech and Vision

Issue 6 • Date Dec. 1993

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Displaying Results 1 - 12 of 12
  • Flow control methodology for virtual-circuit networks

    Publication Year: 1993, Page(s):494 - 504
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (874 KB)

    An input rate flow control methodology for a virtual-circuit computer network is presented. Power is used as the performance measure of a virtual circuit and network power, which is the product of all of the virtual circuit powers, is used as the network performance measure. It is shown that the network power has a unique maximum point in the feasible region of the throughput space. A distributed ... View full abstract»

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  • Trans: a reliable broadcast protocol

    Publication Year: 1993, Page(s):481 - 493
    Cited by:  Papers (3)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1190 KB)

    Trans is a novel reliable broadcast protocol for the data-link layer of the ISO protocol hierarchy. The protocol exploits the broadcast nature of the physical communication media typically used in local-area networks. A combination of positive and negative acknowledgment strategies with transitivity of positive acknowledgments provides reliable operation without requiring a separate acknowledgment... View full abstract»

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  • Multiple-capture performance of DS-SS packet radio systems with common spreading code

    Publication Year: 1993, Page(s):471 - 480
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (717 KB)

    The author presents a multiple-capture model for the centralised spread-spectrum (SS) packet radio systems in which each user is assigned common direct-sequence (DS) spreading code for packet transmission. Basic equations for the multiple-capture probability and throughput performance are derived at the central receiver. At the link-level, two key design parameters in common spreading code systems... View full abstract»

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  • Modelling of radio transmissions into and within multistorey buildings at 900, 1800 and 2300 MHz

    Publication Year: 1993, Page(s):462 - 470
    Cited by:  Papers (11)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (735 KB)

    A multiple regression analysis method is used to predict the signal path loss encountered by radio transmissions into and within buildings at 900, 1800 and 2300 MHz. It has been found that in addition to the initial free space path loss, the floor mean signal level for radio transmissions into buildings is also dependent on the logarithm of the floor area and on the condition of transmission, whic... View full abstract»

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  • Packet reservation protocols for multichannel satellite networks

    Publication Year: 1993, Page(s):453 - 461
    Cited by:  Papers (3)  |  Patents (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (703 KB)

    Owing to system economics, many satellite data networks have star configurations, with low cost user terminals communicating with high performance hub earth stations over inbound multiaccess channels and outbound broadcast channels. The inbound channel data rate is often limited by the power budget, so that multiple satellite channels are required to accommodate the overall traffic in a large netw... View full abstract»

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  • Sample rejection and importance sampling in the simulation of multidimensional signalling systems

    Publication Year: 1993, Page(s):445 - 452
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (676 KB)

    Sample rejection has been proposed as a means for improving the efficiency of computer simulation used for error rate estimation. Previous work has not examined quantitatively the feasibility of sample rejection for improving the efficiency of simulation of multidimensional signalling schemes. The present work aims to determine the usefulness of sample rejection for the simulation of such systems.... View full abstract»

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  • Optimum memoryless bandpass nonlinearities

    Publication Year: 1993, Page(s):436 - 444
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (702 KB)

    Previous work on optimum memoryless bandpass nonlinearities (OMBPNLs) is extended here and applied to cases involving various types of interference, which may, for example, include a cochannel or adjacent-channel angle-modulated waveform as well as narrow-band Gaussian noise. At low input signal-to-interference ratios (SIRs) the nonlinearity that maximises the output signal-to-noise-plus-interfere... View full abstract»

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  • HiMA: a hierarchical and modular ATM switch with partially shared output buffer

    Publication Year: 1993, Page(s):429 - 435
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (553 KB)

    The authors propose a hierarchical and modular ATM switch for BISDN. To improve the queueing performance, they adopt the output queueing technique and allow several outputs to partially share the same output buffer space. The performance of the proposed switch is evaluated under uniform and nonuniform traffic patterns. Comparisons with the knockout switch, recursive switch, SCOQ, and Christmas-tre... View full abstract»

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  • Codeword synchronisation of CCMA scheme

    Publication Year: 1993, Page(s):425 - 428
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (303 KB)

    A kind of codeword synchronisation scheme in decoding adder channel collaborative coding multiple access (CCMA) sequence is presented. By making use of the correlation between adjacent added codewords and the shifting properties of the received sequence, the scheme can provide very good codeword synchronisation information about the received data stream. Simulated results in various noisy environm... View full abstract»

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  • Multilayer perceptron based decision feedback equalisers for channels with intersymbol interference

    Publication Year: 1993, Page(s):420 - 424
    Cited by:  Papers (18)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (343 KB)

    The paper describes the application of multilayer perceptrons to the problem of adaptive channel equalisation in digital communications systems. In particular, the use of decision feedback structures is investigated for time-invariant and time-variant bandlimited channels. Simulation results show that the equaliser based on the multilayer perceptron provides better bit error rate performance compa... View full abstract»

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  • New LSP encoding method based on two-dimensional linear prediction

    Publication Year: 1993, Page(s):415 - 419
    Cited by:  Papers (4)  |  Patents (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (339 KB)

    A new line spectrum pair (LSP) encoding method, two-dimensional differential LSP (2DdLSP) coding, is proposed. This 2DdLSP approach simultaneously takes advantage of strong interframe and intraframe correlation of LSP parameters. The parameters to be quantised are the prediction residuals which possess the property of smaller variance than LSP parameters. This is the key point for the success of t... View full abstract»

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  • Two-level decoding of (32, 16, 8) quadratic residue code

    Publication Year: 1993, Page(s):409 - 414
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (537 KB)

    The Pless (1986) construction of the (24, 12, 8) extended Golay code can be modified to construct the (32, 16, 8) extended QR code. Some structural similarities are discovered between the (32, 16, 8) QR code and the (24, 12, 8) Golay code. A simple decoder is developed based on the two-level structure of the (32, 16, 8) QR code. In addition to correcting all three or less bit errors, the proposed ... View full abstract»

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