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IEE Proceedings - Communications

Issue 3 • Date June 2003

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Displaying Results 1 - 13 of 13
  • K-step pointer forwarding strategy for location tracking in distributed HLR environment

    Publication Year: 2003, Page(s):207 - 213
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (424 KB)

    Managing the location of mobile systems is crucial. The location of a mobile must be determined whenever a connection is established. Thus, mobile systems need to be able to cope with frequent location updates and queries. In addition to the HLR/VLR strategy in IS-41 and GSM, the feasibility of reducing the network load imposed by locating mobile users has attracted considerable attention. One use... View full abstract»

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  • Combined turbo equalisation and block turbo coded modulation

    Publication Year: 2003, Page(s):149 - 152
    Cited by:  Patents (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (344 KB)

    The combination of equalisation and turbo decoded M-QAM is studied. In a system of block turbo coding based on iterative decoding of a product code, equalisation is incorporated in the decoding iteration loop. Most research in this area has considered the trellis equaliser. When using a high throughput modulation trellis equalisation is impossible. The incorporation of a decision feedback equalise... View full abstract»

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  • Performance of a digital code tracking loop for DSSS systems in the presence of Doppler shift

    Publication Year: 2003, Page(s):202 - 206
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (332 KB)

    The authors present a low-complexity non-coherent tracking loop based on the gravity of energy window (GEW). Expressions for the proposed tracking loop in a multipath fading channel with Doppler shift environment are derived. The stationary probability density function (PDF) of the phase error and the root-mean-square (RMS) tracking error are obtained by computer simulation. Statistical simulation... View full abstract»

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  • Performance analysis of MC-CDMA in Rayleigh fading channels with correlated envelopes and phases

    Publication Year: 2003, Page(s):214 - 220
    Cited by:  Papers (19)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (497 KB)

    The performance analysis of a multicarrier code division multiple access (MC-CDMA) system in Rayleigh fading channels with correlated envelopes and phases is presented, and the effect of phase correlation on the bit error rate (BER) performance is demonstrated. An equivalence relation between independent phases and random spreading sequences for asynchronous MC-CDMA is established, which can expla... View full abstract»

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  • High-performance scheduler to achieve proportional delay differentiation

    Publication Year: 2003, Page(s):153 - 158
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (506 KB)

    The proportional delay differentiation model provides a consistent packet delay differentiation between various classes of service. The waiting time priority (WTP) scheduler is a priority scheduler in which the priority of a packet increases in proportion to its waiting time, and it is known to be the best scheduler to achieve the proportional delay differentiation model. The author proposes an ad... View full abstract»

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  • Waiting time distribution for the M/M/m queue

    Publication Year: 2003, Page(s):159 - 162
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (312 KB)

    A novel method is presented for the calculation of the waiting time distribution function for the M/M/m queue. It is shown that the conditional waiting time obeys an Erlang distribution with rate mμ, where μ is the service rate of a server. An explicit closed form solution is obtained by means of the probability density function of the Erlang distribution. The derivation of the result proved... View full abstract»

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  • Towards an adaptive RED algorithm for achieving delay-loss performance

    Publication Year: 2003, Page(s):163 - 168
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (437 KB)

    Random early detection (RED) proposed by Floyd and Jacobson (1993) is an active queue management strategy that has been deployed extensively in routers. However, its effectiveness has been limited owing to the difficulty in tuning its parameters under different network conditions. The authors define the notion of an operating point that an active queue management (AQM) policy should target. They s... View full abstract»

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  • Rate controller for high-speed networks

    Publication Year: 2003, Page(s):169 - 175
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (543 KB)

    In the paper, the statistical performance of a leaky bucket rate controller is analysed. A new operating mechanism is proposed for the leaky-bucket rate controller. The proposed mechanism has the major advantage of allowing a simple embedded Markov chain analysis for the rate controller, when the input traffic is modelled using a generally distributed interarrival process. Analysis is developed to... View full abstract»

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  • Signalling constellations for power-efficient bit-interleaved coded modulation schemes

    Publication Year: 2003, Page(s):141 - 148
    Cited by:  Papers (3)  |  Patents (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (601 KB)

    Bit-interleaved coded modulation (BICM) is a bandwidth-efficient coding technique consisting of serial concatenation of binary error-correcting coding, bit-by-bit interleaving, and high-order modulation. The author addresses the problem of finding the signal sets that are most suitable for designing power-efficient BICM schemes over an additive white Gaussian noise channel. To this end, the expres... View full abstract»

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  • Aggregation technique for networks with power law traffic and application to accelerated simulation

    Publication Year: 2003, Page(s):177 - 183
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (523 KB)

    The authors present an accelerated simulation technique for packetised networks, and examine the accuracy and speedup obtained when it is used in studies of power law traffic, including cases where the sojourn times have been truncated to imitate real network operation. The aggregation concept has also been applied to an end-to-end path, where both the number of end-to-end nodes and the number of ... View full abstract»

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  • ATM switch with dual transceiver ring architecture

    Publication Year: 2003, Page(s):184 - 188
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (378 KB)

    Different techniques exist for an asynchronous transfer mode (ATM) switch design. An ideal ATM switch has high throughput, low loss and low delay. A technique for designing an ATM switch is the use of a shared medium. In this technique a bus or ring may be used as the shared medium. A new switch that uses a dual ring as a shared medium is introduced. The dual ring topology has been proposed for lo... View full abstract»

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  • Queueing analysis of an ATM multimedia multiplexer with non-pre-emptive priority

    Publication Year: 2003, Page(s):189 - 196
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (511 KB)

    A queueing-theoretic analysis of an ATM multiplexer handling two-class multimedia traffic is described. Specifically, it assigns class-1 cells, constituting real-time traffic, high service priority, and class-2 cells, constituting non-real time traffic, low service priority. The priority discipline used is non-pre-emptive. For the purpose of the analysis, the multiplexer is modelled as a priority,... View full abstract»

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  • Traffic grooming on general topology WDM networks

    Publication Year: 2003, Page(s):197 - 201
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (407 KB)

    The authors consider the traffic grooming problem on general topology WDM networks. The problem is: given a set of t connections, their routes and the grooming factor g, find an optimal wavelength assignment and grooming such that the number of wavelengths required in the network is minimised. This problem is first formulated as an integer linear programming problem, and then a heuristic is propos... View full abstract»

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