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IEE Proceedings - Communications

Issue 1 • Date Feb 2002

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Displaying Results 1 - 10 of 10
  • Transmitter buffer behaviour of stop-and-wait ARQ schemes with repeated transmissions

    Publication Year: 2002, Page(s):13 - 17
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (524 KB)

    The statistical analysis of a number of previously proposed ARQ protocols of the stop-and-wait type is performed. Specifically, a method is described to find the tail distribution (i.e. the probability of exceeding a certain threshold) for the delay time of the transmitted data blocks and the queue or buffer occupancy at the transmitter side. A performance comparison of the schemes is given, based... View full abstract»

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  • Destination-initiating path restoration protocol for wavelength-routed WDM networks

    Publication Year: 2002, Page(s):18 - 22
    Cited by:  Papers (2)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (548 KB)

    Network survivability has been a crucial concern in wavelength-routed WDM networks. Due to the huge transmission capacity, a single network failure may cause a large amount of data loss, which would greatly degrade and even disrupt network services. In the paper, a destination initiating path restoration protocol is proposed for surviving single-link failures in wavelength routed WDM networks. Unl... View full abstract»

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  • Performance analysis of threshold based bandwidth allocation scheme for IP traffic on ATM networks

    Publication Year: 2002, Page(s):29 - 35
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (597 KB)

    The authors analyse a discrete-time based finite queueing model with deterministic service times and a Markov modulated batch Bernoulli process (MMBBP) as a bursty input traffic model in order to investigate the performance of a double threshold based dynamic bandwidth allocation scheme for IP traffic on ATM networks. It is assumed that the segmentation processing time devoted to each cell require... View full abstract»

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  • Interleaving and termination in unpunctured symmetric turbo codes

    Publication Year: 2002, Page(s):6 - 12
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1162 KB)

    The turbo code interleaver design problem is considered for large block sizes, where the effect of trellis termination is less marked. The performance is compared for various interleavers with a similar block size, including an implementation of the uniform interleaver. An optimised interleaver design technique based on simulated annealing is proposed. The results obtained show that the error perf... View full abstract»

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  • Capacity-coverage analysis of TDD and FDD mode in UMTS at 1920 MHz

    Publication Year: 2002, Page(s):51 - 57
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (759 KB)

    In the Universal Mobile Telephony System (UMTS) the frequency division duplex (FDD) and time division duplex (TDD) modes have adjacent carriers at 1920 MHz. This creates adjacent channel interference (ACI) between the two different air interfaces. Since different duplexing modes are used, the implications for each system are different, with respect to capacity and coverage: these implications are ... View full abstract»

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  • Analysis of dynamic service separation with trunk reservation policy

    Publication Year: 2002, Page(s):23 - 28
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (717 KB)

    The paper is concerned with the analysis of dynamic service separation under the trunk reservation policy. In the framework of dynamic service separation, statistical multiplexing of cell streams from each service can be well captured by an equivalent capacity that may take a nonlinear form. The conventional trunk reservation policy is extended to consider the nonlinear equivalent capacity. Variou... View full abstract»

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  • Decoding of generalised low-density parity-check codes using weighted bit-flip voting

    Publication Year: 2002, Page(s):1 - 5
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (670 KB)

    A generalised low-density parity-check code (GLDPC) is a low-density parity-check code in which the constraint nodes of the code's graph are replaced with component or subcodes other than single parity checks. Gallager's (1963) bit-flipping algorithm for LDPCs is generalised to the class of GLDPCs with Hamming subcodes. The proposed weighted bit-flip voting (WBFV) method is iterative and uses only... View full abstract»

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  • Coherent frequency/phase modulation scheme

    Publication Year: 2002, Page(s):36 - 44
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (819 KB)

    An L-phase-levelled coherent frequency/phase modulation (LCFPM) scheme is investigated. It is analysed for both spectral characteristics and bit error characteristics on the additive white Gaussian noise channel. Comparison with conventional joint frequency and phase modulations is conducted in terms of power and bandwidth efficiencies. Both uncoded and trellis coded modulation formats are conside... View full abstract»

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  • Carrier-frequency estimation for space-diversity reception over selective channels

    Publication Year: 2002, Page(s):58 - 64
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (711 KB)

    Carrier-frequency estimation for space-diversity reception over frequency-selective channels is discussed. Three estimation schemes based on training sequences are proposed. The first scheme employs arbitrary sequences and provides joint maximum likelihood (ML) estimates of the carrier frequency and the channel response. Its implementation is complex, but its accuracy achieves the Cramer-Rao bound... View full abstract»

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  • Blind equalisation technique based on an improved constant modulus adaptive algorithm

    Publication Year: 2002, Page(s):45 - 50
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (646 KB)

    A blind equalisation technique based on an improved constant modulus adaptive (CMA) algorithm is proposed. This technique can accomplish blind equalisation and carrier phase recovery simultaneously as well as easily switch between blind and decision-directed modes. It also takes advantage of the principle of minimum disturbance to avoid the gradient noise amplification problem and achieve improved... View full abstract»

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