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Communications, IEE Proceedings-

Issue 5 • Date Oct 1997

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Displaying Results 1 - 12 of 12
  • New multiuser detector for asynchronous CDMA

    Publication Year: 1997 , Page(s): 336 - 340
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (432 KB)  

    A novel multiuser detector for asynchronous code division multiple access (CDMA) system is presented. Using a new type of spreading sequences and shortened correlators with linear combining, an unbiased one-shot suboptimum detection is achieved without increasing the receiver complexity. Two decorrelating algorithms, the direct and the recursive methods, are given for the proposed detector configu... View full abstract»

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  • Analysis and design of survivable telecommunications networks

    Publication Year: 1997 , Page(s): 322 - 330
    Cited by:  Papers (5)  |  Patents (5)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (948 KB)  

    The analysis and design of mesh restorable and self-healing ring networks is considered. A general class of traffic-based survivability measures to analyse telecommunications networks is proposed. These measures calculate the average traffic-carrying capability of a network over all possible failure states. Traffic-based survivability measures are proposed to analyse mesh networks with and without... View full abstract»

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  • Performance analysis of delay-loss priority mechanism using Markov modulated arrival stream

    Publication Year: 1997 , Page(s): 311 - 315
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (524 KB)  

    The authors propose a new mechanism to handle the delay and loss requirements of ATM traffic simultaneously. It is designed to satisfy the different levels of cell-loss performance for two classes of heterogeneous nonreal-time ATM traffic as well as the delay and loss requirements of real-time traffic simultaneously. The cell arrivals of the input streams are modelled by the MMPP. Both a real-time... View full abstract»

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  • Markov analysis of multichannel star-connected network with channel sensing and collision detection

    Publication Year: 1997 , Page(s): 331 - 335
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (392 KB)  

    When many stations need to communicate with a central server, the simplest way to allow them to transmit messages to the server is to use a non-centralised contention access protocol. One of the most efficient of these protocols is channel sense multiple access with collision detection (CSMA/CD). Exact analyses of single-channel CSMA/CD networks have been done, but, so far, all the analyses of mul... View full abstract»

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  • Cycle-slipping probability of first-order phase-locked loop using transient analysis

    Publication Year: 1997 , Page(s): 357 - 360
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (376 KB)  

    The first-order phase-locked loop is a standard feedback device commonly used to provide both carrier and clock synchronisation in digital transmission systems. At low signal-to-noise ratios increased jitter on the timing estimates results in a raised probability of symbol error and an increased likelihood of synchroniser symbol slips; in the latter case, symbols are either deleted from or inserte... View full abstract»

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  • Distortion effects of multicarrier envelope limiting

    Publication Year: 1997 , Page(s): 349 - 356
    Cited by:  Papers (3)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (708 KB)  

    The feasibility of reducing the peak power rating of a multichannel amplifier by limiting the peak-to-mean ratio of its input signal is examined in terms of the resulting intermodulation distortion levels. A number of current modulation schemes are examined and the effects of limiting are highlighted in each case, In addition, both ideal and practical limiter characteristics are assessed and the d... View full abstract»

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  • Modelling multimedia traffic over ATM using MMBP

    Publication Year: 1997 , Page(s): 307 - 310
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (312 KB)  

    The Markov-modulated Bernoulli process (MMBP) is widely used in modelling traffic sources. The authors propose a so-called high-low (H/L) model, a two-state Markov chain, to characterise multimedia traffic on ATM-based broadband networks. The H/L model has two nonzero-valued states corresponding to the high-activity and the low-activity level of multimedia traffic. The queue-length distribution of... View full abstract»

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  • Access flow control scheme for ATM networks using neural-network-based traffic prediction

    Publication Year: 1997 , Page(s): 295 - 300
    Cited by:  Papers (5)  |  Patents (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (572 KB)  

    The authors propose a new approach to the problem of congestion control arising at the user network interface (UNI) of ATM-based broadband networks. The access flow control mechanism operates on the principle of feedback control. It uses a finite impulse response (FIR) neural network to accurately predict the traffic arrival patterns. The predicted output in conjunction with the current queue info... View full abstract»

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  • Computer model for analysing digital magnetic recording systems

    Publication Year: 1997 , Page(s): 289 - 294
    Cited by:  Patents (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (544 KB)  

    A simple model is developed for the recording performance of a complete digital magnetic recording system using peak detection and an instrumentation tape recorder operating in the low/mid speed range of its capabilities. Results obtained using this model are compared with a wide variety of experimental data. Studies are made of channel and equaliser output pulses and also probability of error as ... View full abstract»

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  • Loss periods in ATM output multiplexer

    Publication Year: 1997 , Page(s): 301 - 306
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (504 KB)  

    The authors present a new approach to evaluating the loss periods in the output multiplexer of an ATM switch. First, they present a model for the output multiplexer using a discrete time finite capacity queueing system model with a threshold in the queue and priority in the bursty incoming cells. In modelling the loss period, they divide the queue space into a nonloss region, a half-loss region an... View full abstract»

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  • Engineering of a CDMA radio uplink for a mobile radio demonstration system

    Publication Year: 1997 , Page(s): 341 - 348
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (996 KB)  

    A CDMA mobile radio demonstration system has been created by a joint industry/university project in the UK. The paper describes the engineering of the reverse link (from mobile to base station). The link hardware is described. The main features of interest are the power mechanism and the all-digital RAKE receiver. Results presented illustrate the BER performance over a multipath channel simulator ... View full abstract»

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  • Performance improvement of fibre-optic code-division multiple-access systems by using error-correction codes

    Publication Year: 1997 , Page(s): 316 - 321
    Cited by:  Papers (5)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (560 KB)  

    In code-division multiple-access (CDMA) systems using all-optical signal processing, the optical multiple-access interference (OMAI) degrades the system performance and can ultimately limit the number of active users. To reduce the effect of OMAI, error-correction codes are used in both asynchronous and synchronous fibre-optic CDMA systems. It is shown that the use of asymmetric error-correction b... View full abstract»

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