By Topic

IEE Proceedings - Communications

Issue 4 • Aug 1998

Filter Results

Displaying Results 1 - 11 of 11
  • Look-ahead reservation-based scheduling for input-output buffered ATM switch

    Publication Year: 1998, Page(s):234 - 240
    Cited by:  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (632 KB)

    The authors present a decentralised scheduling approach for an input-output buffered ATM switch based on look-ahead reservation that minimises head-of-line blocking. Cells in an input port are queued separately according to their destined output port. To schedule the transmission time of cells in the input buffer, the input port may send requests to output ports to reserve bandwidth and buffer spa... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Neurocontroller for buffer overload control in a packet switch

    Publication Year: 1998, Page(s):227 - 233
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (592 KB)

    The authors describe a buffer overload control scheme, which adaptively matches the buffer input rate to prevailing conditions in the queueing system, for efficient utilisation of the system resources. They propose an adaptive feedback control algorithm which uses neural network modelling of the system dynamics and a gradient-based control optimisation technique for buffer overload control. Using ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Practical 8-PSK block-coded modulation with convolutional codes and soft decision block codes for packet networks

    Publication Year: 1998, Page(s):218 - 226
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (948 KB)

    The design and performance of a class of practical rate 2/3, 8-PSK block-coded modulation (BCM) (also referred to as multilevel modulation codes) schemes are presented. These BCM schemes utilise both convolutional codes and block codes, and have block lengths that are matched with relatively short packet lengths to satisfy requirements in packet-wireless networks. Decoding issues such as optimum s... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Analysis of dynamic priority cell discarding

    Publication Year: 1998, Page(s):249 - 258
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (800 KB)

    A cell discarding mechanism with dynamic priority assignment is proposed and analysed. Cell streams of each connection are monitored periodically. The priority of each connection is adjusted dynamically according to its past behaviour. When congestion occurs, cells from low-priority connections shall be rejected. The rejection is done through a gating device for each connection. Using this approac... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Shaping the boundary of a multi-dimensional signal constellation with a non-flat power spectrum

    Publication Year: 1998, Page(s):213 - 217
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (416 KB)

    The author considers the selection of the boundary (shaping region) of a multi-dimensional signal constellation with the objective of minimising the constellation energy for a given rate and subject to some constraints on the resulting power spectrum. This shaping region is selected such that the efficient addressing technique of `shell mapping' is applicable. Numerical results are presented for t... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Analysis and performance comparison of the trellis coded and convolutional coded DS/SSMA systems in impulsive noise environment

    Publication Year: 1998, Page(s):283 - 287
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (416 KB)

    The authors investigate the performance of two types of direct-sequence spread-spectrum multiple-access (DS/SSMA) systems in an impulsive noise, Rician fading environment. It is observed that it is possible to get some coding gain over uncoded systems except at low SNR and that additional coding gain can be obtained by using optimum asymmetric TCM. It is also shown that the performance of the DS/S... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Fault diagnosis of a distributed knockout switch

    Publication Year: 1998, Page(s):241 - 248
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (668 KB)

    The distributed knockout switch has multiple paths between any input and output pair and thus is inherently robust to faults without the need of adding any additional switch elements. However, to achieve fault tolerance, one has to first detect and locate the faults. The authors present an efficient fault diagnosis procedure to detect, locate, and identify the fault type of single switch element f... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • New system for the interconnection of ATM networks via wireless links

    Publication Year: 1998, Page(s):259 - 264
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (592 KB)

    The authors analyse the introduction of a wireless link between two nodes in an ATM network for the transmission of data and multimedia services. The ATM cell structure and length are modified in the wireless link in order to operate in a satisfactory way. The adoption of error control techniques is also analysed. The performance of the proposed scheme has been evaluated for wireless channels with... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Performance analysis of optical orthogonal codes in CDMA LANs

    Publication Year: 1998, Page(s):265 - 271
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (540 KB)

    The adoption of optical signal processing in CDMA LANs requires the design of new families of spreading codes called optical orthogonal codes (OOCs), due to the absence of negative elements in the system. Previously, performance analysis used in electrical signal-processing systems has been applied in optical systems without taking into account the differences between the two systems. The probabil... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Diversity reception of fading signals in spherically invariant noise

    Publication Year: 1998, Page(s):272 - 276
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (508 KB)

    The problem of noncoherent diversity reception of one out of M equally likely signals is addressed. The signal on each diversity channel is affected by slow and nonselective fading with an arbitrary distribution law, and is subject to additive correlated non-Gaussian noise modelled as a spherically invariant random process. An asymptotically (i.e. for large sample size) optimum receiver is synthes... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Practical RAKE receiver architecture for the downlink communications in a DS-CDMA mobile system

    Publication Year: 1998, Page(s):277 - 282
    Cited by:  Papers (3)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (468 KB)

    The authors deal with a practical architecture for a RAKE receiver suitable for the downlink communication in a direct-sequence code division multiple access (DS-CDMA) mobile system. The proposed RAKE receiver makes use of a pilot signal broadcast by the base station to obtain channel parameter estimation and synchronisation. Computer simulations have been carried out in deriving the performance i... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.