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IEEE Communications Letters

Issue 2 • March 1997

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Displaying Results 1 - 7 of 7
  • A traffic model for non-real-time data users in a wireless radio network

    Publication Year: 1997, Page(s):37 - 39
    Cited by:  Papers (40)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (36 KB)

    Based on an analysis of Internet protocols for data communication, we propose a simple model for future data traffic in wireless radio networks. Model parameters are selected so as to resemble traffic from the Worldwide Web (WWW) access and from distributed file systems. By changing a single parameter, the model can be switched between resembling up- or down-link traffic. The model is intended for... View full abstract»

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  • Effects of directional antennas at the base station on the Doppler spectrum

    Publication Year: 1997, Page(s):40 - 42
    Cited by:  Papers (36)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (97 KB)

    We analyze the effect of directional antennas at the base station on the Doppler spectrum. It is well known that the Doppler spectrum is dependent on the probability density function (pdf) of the angle-of-arrival (AOA) of the multipath components at the mobile unit and the direction of the motion of the mobile. The Doppler spectrum is U-shaped, when the pdf of the AOA of the multipath components a... View full abstract»

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  • Capacity losses in sector and microcell cellular systems

    Publication Year: 1997, Page(s):43 - 45
    Cited by:  Papers (3)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (50 KB)

    Cellular system capacity calculations are based on the assumption that traffic is uniformly distributed. A simple analysis of hourly cellular cell site usage statistics is performed to assess the validity of this assertion. The data shows that call traffic is not uniform across geography or time of day. For the particular data set used there is a 9% capacity penalty incurred by reducing the geogra... View full abstract»

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  • OFDM burst frequency synchronization by single carrier training data

    Publication Year: 1997, Page(s):46 - 48
    Cited by:  Papers (31)  |  Patents (46)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (92 KB)

    We propose a burst frequency synchronization procedure which is based on the usage of single-carrier training data and orthogonal frequency division multiplexing (OFDM) payload modulation. The payload modulation format is similar to the one that is used in the DAB standard, whereas training data are chosen as simple CAZAC sequences. It is shown that the resulting modulation and transmission scheme... View full abstract»

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  • A novel ARQ technique using the turbo coding principle

    Publication Year: 1997, Page(s):49 - 51
    Cited by:  Papers (117)  |  Patents (61)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (59 KB)

    A novel automatic repeat request (ARQ) technique based on the turbo coding principle is presented. The technique uses the log-likelihood ratios generated by the decoder during a previous transmission as a priori information when decoding retransmissions. Simulation results show a significant decrease in frame error rate, especially at low-to-moderate E/sub b//N/sub 0/. View full abstract»

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  • A structured channel estimator for maximum-likelihood sequence detection

    Publication Year: 1997, Page(s):52 - 55
    Cited by:  Papers (31)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (141 KB)

    This letter describes a channel estimator using known prior information about the transmit and receive filters. It is shown that the composite channel lies in the subspace of the transmit and receive filter impulse responses. A structured linear channel model is then developed that is linearly parametrized by an unknown vector. To illustrate the potential usefulness of such an approach, the estima... View full abstract»

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  • Bifurcated queueing for throughput enhancement in input-queued switches

    Publication Year: 1997, Page(s):56 - 57
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (59 KB)

    We propose a bifurcated queueing approach to breaking the well-known 0.586 barrier for the throughput of input queued switches with head-of-line blocking. Each input line maintains a small number k of parallel queues, one for each of a set of k mutually exclusive subsets of the set of output-port addresses. We generalize the analysis of Karol et al. (1987) and show that the upper bound on throughp... View full abstract»

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IEEE Communications Letters publishes letters on the frontiers of research within the field of interest of the IEEE Communications Society in a timely manner.

 

 

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Octavia Dobre
Memorial University, Canada