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IEE Proceedings - Communications

Issue 4 • Date Aug 1999

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Displaying Results 1 - 8 of 8
  • Trellis-based power control for direct sequence CDMA in a Rayleigh fading environment

    Publication Year: 1999, Page(s):258 - 264
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (652 KB)

    A mobile user's signal strength fluctuates significantly and rapidly due to Rayleigh fading. Unless the time gap in adjusting the transmitting power to an ideal level is eliminated, either the signal-to-interference ratio is too low to meet the minimum requirement, or excessive interference to other users occurs. In the paper, the time gap is reduced by devising a trellis-based prediction method t... View full abstract»

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  • Performance of turbo trellis-coded modulation (T-TCM) on frequency-selective Rayleigh fading channels

    Publication Year: 1999, Page(s):251 - 257
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (552 KB)

    Turbo trellis-coded modulation (T-TCM) is one of several techniques for combining turbo codes with multilevel modulation schemes to save the bandwidths of the transmission systems. T-TCM has been shown to perform very well on AWGN channels, but its performance on frequency-selective fading channels is still unknown. A system model to investigate the performance of various T-TCM schemes on frequenc... View full abstract»

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  • Reducing ATM CAC overhead by utilising aggregated traffic statistics

    Publication Year: 1999, Page(s):209 - 212
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (404 KB)

    The quality-of-service (QoS) in ATM networks is largely determined by call admission control (CAC) and switch scheduling algorithms. A CAC algorithm determines if a requested connection can be accepted without violating QoS bounds for the new connection and for existing connections. To support QoS in ATM switches, earliest deadline first (EDF) scheduling can be implemented to ensure that the cells... View full abstract»

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  • Performance analysis for cellular mobile network with mixed services and platform types

    Publication Year: 1999, Page(s):246 - 250
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (428 KB)

    A fixed-point approximation for estimating various performance measures in cellular mobile networks with mixed services and platform types is considered. To maintain handoff priority and access regulation, it is assumed that the system operates under a trunk-reservation policy. The correlations among cells due to handoff traffic are expressed by rate equations and the distribution of the number of... View full abstract»

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  • Fast robust quasi-Newton algorithm for adaptive arrays

    Publication Year: 1999, Page(s):231 - 239
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (776 KB)

    A stable, fast (order-of-N) quasi-Newton (QN) algorithm (FRQN) applicable to arbitrary array signals is presented. Its complexity is only twice that of the normalised least mean squares (NLMS) algorithm, yet its convergence is faster and smoother, proceeding along the optimal QN path as that of the order N2 recursive least squares (RLS) algorithm, albeit more slowly. The development of ... View full abstract»

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  • Realistic modelling of blocked packets for accurate performance evaluation of ATM switches

    Publication Year: 1999, Page(s):213 - 221
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (712 KB)

    Multistage switches have been used as ATM switching fabrics in broadband ISDN networks, and also to connect processors to memories in massively parallel multiprocessor systems. Previous performance models for multistage switches have been neither accurate enough nor based on realistic assumptions regarding modelling the correlation of the blocked packets in successive stages of the switch. Two new... View full abstract»

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  • Adaptive channel identification and equalisation algorithms using forward-backward optimisation

    Publication Year: 1999, Page(s):240 - 245
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (504 KB)

    An adaptive semi-blind approach for space-time channel identification and equalisation is proposed which exploits the inherent structural constraints and relationships of the channel output vectors and data sequence by means of a forward-backward optimisation procedure. Two adaptive semi-blind algorithms based on this approach are presented and analysed using computer simulations. In addition to b... View full abstract»

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  • Non-congestion packet loss detection for TCP error recovery using wireless links

    Publication Year: 1999, Page(s):222 - 230
    Cited by:  Papers (46)  |  Patents (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (784 KB)

    Most commonly used data transfer protocols assume that every packet loss is an indication of network congestion. This interaction between the error recovery and the congestion control procedures results in a low utilisation of the link when there is an appreciable rate of losses due to link errors. This issue is significant for wireless links, particularly those with a long propagation delay. A so... View full abstract»

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