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IEE Proceedings - Communications

Issue 6 • Date Dec 1995

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Displaying Results 1 - 10 of 10
  • Grobner basis view of Welch-Berlekamp algorithm for Reed-Solomon codes

    Publication Year: 1995, Page(s):349 - 351
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (280 KB)

    Grobner bases of modules have been used to provide a unifying theoretical approach to the various algorithms for solving the key equation Ω(x)≡S(x)Λ(x) (mod X2f) in decoding Reed-Solomon codes. The Welch-Berlekamp algorithm solves a different key equation based on rational interpolation. When the solution is viewed as a canonical element in a module M, the algorithm i... View full abstract»

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  • Coding for both protection and synchronisation

    Publication Year: 1995, Page(s):352 - 356
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (520 KB)

    The majority of the classical methods for synchronisation for digital communications systems require a hardware overhead and additional data added to the information stream to provide effective synchronisation. The paper discusses recent advances which offer alternatives to these existing methods. A novel synchronisation technique which utilises auxiliary information obtained from the soft maximum... View full abstract»

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  • Decoding double-error-correcting Reed-Solomon codes

    Publication Year: 1995, Page(s):345 - 348
    Cited by:  Papers (1)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (424 KB)

    The decoding of double-error-correcting (DEC) Reed-Solomon (RS) codes is considered. It is shown that by modifying a well known decoding algorithm for DEC RS codes and solving the error-locator polynomial by Berlekamp's method for solving quadratic equations, efficient hardware architectures can be derived. Furthermore, these architectures are particularly suited to implementation over the dual ba... View full abstract»

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  • Diversity for noncoherent DPSK direct-sequence CDMA over a shadowed Rician-fading satellite channel

    Publication Year: 1995, Page(s):386 - 392
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (512 KB)

    Spatial-diversity schemes with distributed detection combining are analysed and compared with selection and maximal-ratio for noncoherent DPSK direct-sequence CDMA (DS-CDMA) in a shadowed Rician-fading land-mobile satellite channel. To evaluate the performance of the distributed-detection combining scheme, the Chernoff upper bound on its bit error probability is employed. In the distributed-detect... View full abstract»

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  • Some new families of optical orthogonal codes for code-division multiple-access fibre-optic networks

    Publication Year: 1995, Page(s):363 - 368
    Cited by:  Papers (16)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (492 KB)

    An optical orthogonal code (OOC) is a collection of binary sequences with good auto- and cross-correlation properties; they were defined by Chung and others as a means of obtaining code division multiple access on optical networks. In the paper three new families of OOCs are constructed from the balanced incompleted block design techniques. The first family of the codes is with ideal auto- and cro... View full abstract»

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  • Decoding of multilevel block modulation codes

    Publication Year: 1995, Page(s):341 - 344
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (276 KB)

    The main problem in basic block coded modulation (BCM) is the large path multiplicity, and therefore maximum likelihood decoding is not possible. Sayegh (1986) proposed a sub-optimal decoding method which decodes well only at high signal/noise ratios. The author proposes a two-stage decoding method which will improve error performance without too much circuit complexity View full abstract»

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  • Extended analysis of word synchronisation using sequence correlation techniques

    Publication Year: 1995, Page(s):357 - 362
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (568 KB)

    The acquisition of word synchronisation by sequence identification is examined. A model for the simple correlator is developed which can be used to test candidate sequences when searching for the optimum design; the theoretical performance agrees with results obtained from representative simulation trials. Search techniques have been used to identify selected sequences with good word-synchronisati... View full abstract»

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  • Cell-rate modelling for accelerated simulation of ATM at the burst level

    Publication Year: 1995, Page(s):379 - 385
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (760 KB)

    The paper presents a new method for the accelerated simulation of ATM networks. The method uses queue and traffic models that manipulate cell-rate information rather than the arrival times of cells. The cell-rate queueing model described in the paper has been validated by comparison with fluid-flow analysis and discrete time queueing analysis with batch geometric arrivals. Results show that the me... View full abstract»

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  • Narrowband interference rejection in direct-sequence spread-spectrum system using time-frequency decomposition

    Publication Year: 1995, Page(s):393 - 400
    Cited by:  Papers (9)  |  Patents (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (672 KB)

    The paper presents a novel method of enhancing the interference rejection capability of a direct-sequence spread-spectrum system. The method is based on performing a frequency analysis of the received signal using a simple filter bank structure in such a way that the temporal information in the input signal is retained. A thresholding algorithm is used to suppress the interference by detecting its... View full abstract»

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  • Two-connected multiple-token multiple-ring network

    Publication Year: 1995, Page(s):369 - 378
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (848 KB)

    The authors study the performance of a two-connected multiple-token multiple-ring network in which each node has only two transceivers and two medium access control entities. They show that such a network is suitable for an environment in which the traffic patterns are clustered. An approximate analysis of the average transfer delay performance for the network is presented, the results of which ar... View full abstract»

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