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IEE Proceedings - Communications

Issue 1 • Date Feb 2000

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Displaying Results 1 - 10 of 10
  • Performance analysis method for optical codes in coherent optical CDMA networks

    Publication Year: 2000, Page(s):41 - 46
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (236 KB)

    In the past, the selection of the address codes for coherent optical CDMA networks was carried out with the assumption that synchronisation at both sequence bit and data bit frame levels had been achieved throughout the networks at all times (totally synchronous (TS) systems). Establishing and maintaining global synchronisation requires costly and complex hardware. One way to alleviate this proble... View full abstract»

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  • DBG MANs and their routing performance

    Publication Year: 2000, Page(s):32 - 40
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (396 KB)

    The authors propose the de Bruijn graph (dBG) as a topology for multi-hop lightwave networks and their hierarchical structures. Three routing algorithms that would progressively improve on the mean path length and network throughput-delay performance are studied under various topological variations and locality factors. The study shows that the performance of the bidirectional dBG networks and the... View full abstract»

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  • Proportionally fair pricing: dynamics, stability and pathology

    Publication Year: 2000, Page(s):23 - 31
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (368 KB)

    A potential key to the future control on the Internet of high quality-of-service traffic is dynamic pricing of bandwidth allocations, with `proportional fairness' as one attractive possibility. For the first time to the authors' knowledge, `small-changes' and complex frequency-domain techniques (as used in classical control theory) are used to study dynamics of the relationships between bid-prices... View full abstract»

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  • Design of optimum M-PSK codes for Rayleigh fading channel

    Publication Year: 2000, Page(s):13 - 17
    Cited by:  Papers (2)  |  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (216 KB)

    A methodology for the design of M-PSK codes for the Rayleigh fading channel optimised for a specific target BER is proposed, using the framework of multilevel coded modulation. The principle is to equalise the BER at each stage of a multistage decoder. An 8-PSK code is designed which exceeds the performance of the code of Seshadri and Sundberg (1992) by 2.4 dB at BER=10-3 as well as 16-... View full abstract»

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  • Step-by-step decoding algorithm for Reed-Solomon codes

    Publication Year: 2000, Page(s):8 - 12
    Cited by:  Papers (7)  |  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (216 KB)

    A new step-by-step decoding algorithm for decoding Reed-Solomon codes over GF(2m) is presented. Based on several properties of the syndrome matrices, the new step-by-step decoding algorithm can directly determine whether every received symbol is an error locator. The detection of error location is based only on the determinant of a v×v syndrome matrix, where v is the number of err... View full abstract»

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  • ATM-level performance analysis on a DS-CDMA satellite link using DTX

    Publication Year: 2000, Page(s):47 - 56
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (452 KB)

    The authors present analysis and numerical results for ATM cell transmission over a DS-CDMA satellite link. An increase in capacity is achieved by using discontinuous transmission detection (DTX) for all on-off sources, thus exploiting the burstiness of ATM traffic. Three scenarios are analysed. System performance is expressed in terms of link efficiency, capacity and their relative increases. It ... View full abstract»

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  • Optimum delay and mean square error using a mixed crosscorrelation and constant modulus algorithm

    Publication Year: 2000, Page(s):18 - 22
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (252 KB)

    The performance of the constant modulus algorithm can suffer because of the existence of local minima with large mean squared error (MSE). The paper presents a new method to obtain the optimum MSE over all delays using a second equaliser with a mixed constant modulus and cross-correlation algorithm (CM-CCA). Proof of convergence is obtained for the noiseless case for a general symbol constellation... View full abstract»

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  • Annealed neural network based multiuser detector in code division multiple access communications

    Publication Year: 2000, Page(s):57 - 62
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (264 KB)

    An annealed neural network based multiuser detector in code division multiple access (CDMA) communications is presented. This detector combines features of the Hopfield neural network and simulated annealing. Unlike existing neural network based detectors, this detector does not need good initial estimates or optimal selection of network parameters. The BER performance of the proposed detector is ... View full abstract»

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  • Intelligent location tracking strategy in PCS

    Publication Year: 2000, Page(s):63 - 68
    Cited by:  Papers (9)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (280 KB)

    An alternative strategy (AS) for reducing location update signalling load has been proposed to improve the classical strategy (CS) used in the Global System for Mobile Communications (GSM). However, the AS is suitable only for long-term events and fixed movement tracks. Location tracking (paging) costs more when the mobile host (MH) changes movement habits or encounters short-term events. A novel ... View full abstract»

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  • Design of trellis decoders for block-coded modulation schemes

    Publication Year: 2000, Page(s):1 - 7
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (332 KB)

    Block-coded modulation (BCM) combines bandwidth-efficient modulation techniques with error-correction capabilities to allow efficient data transmission over mobile communication channels. The main shortcoming of BCM is the complex decoding process for which, until today, mainly suboptimum decoding methods are used, because existing approaches for trellis decoders are limited to a small subset of p... View full abstract»

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