IEEE Communications Letters

Issue 6 • June 1999

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Displaying Results 1 - 11 of 11
  • DECT coverage of indoor-outdoor environments

    Publication Year: 1999, Page(s):161 - 163
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (63 KB)

    A joint street microcell/office picocell model is used to evaluate a digitally enhanced cordless telecommunications (DECT) system providing outdoor as well as indoor radio coverage from indoor radio ports. The indoor DECT network is able to provide seamless communication within the city area with no capacity loss, provided that the majority of calls are originated from indoors. View full abstract»

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  • A generalized Doppler power spectrum for wireless environments

    Publication Year: 1999, Page(s):164 - 165
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (37 KB)

    We provide a direct derivation of a generalized Doppler power spectrum of the signal received by a mobile station traveling at a constant velocity. The derivation uses the three-dimensional (3-D) incident radiation intensity and the receiving antenna pattern to obtain an expression for the generalized power spectrum which is useful in environments where the 3-D propagation characteristics of wirel... View full abstract»

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  • Performance improvement of a discriminator receiver through the implementation of a nonlinear decision

    Publication Year: 1999, Page(s):166 - 168
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (80 KB)

    The possibility to use a double filter balanced discriminator to demodulate (Gaussian) frequency-shift keying signals with small modulation index and small bandwidth-product is proposed. Therefore, a novel nonlinear decision algorithm is introduced that determines the transmitted bit depending on the discriminator output. It is shown that the performance can be considerably increased when the algo... View full abstract»

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  • Gain reductions due to scatter on wireless paths with directional antennas

    Publication Year: 1999, Page(s):169 - 171
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (48 KB)

    The use of a directional terminal antenna on a wireless link can enhance the received power by as much as the antenna gain. In local scattering, however, the enhancement will be smaller. We call this decrement the gain reduction factor, /spl Delta/. We present a statistical model of /spl Delta/ for fixed suburban paths at 1.9 GHz, based on angle-of-arrival measurements in New Jersey. Our results a... View full abstract»

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  • Generation of correlated Rayleigh fading envelopes

    Publication Year: 1999, Page(s):172 - 174
    Cited by:  Papers (38)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (49 KB)

    A previous technique for generating correlated Rayleigh envelopes is generalized and physically interpreted to model specified propagation delay spread and frequency separation. Two accurate closed-form expressions that give explicitly the squared magnitude of the complex Gaussian cross-correlation coefficient in terms of the real envelope cross-correlation coefficient are derived to improve the e... View full abstract»

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  • Moment-method estimation of the Ricean K-factor

    Publication Year: 1999, Page(s):175 - 176
    Cited by:  Papers (233)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (30 KB)

    In many radio propagation environments, the time-varying envelope of the received signal can be statistically described by a Ricean distribution. Traditional methods for estimating the Ricean K-factor from measured power versus time are relatively cumbersome and time consuming. We describe a simple and rapid approach wherein the K-factor is an exact function of moments estimated from time-series d... View full abstract»

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  • A novel spread spectrum-based synchronization and location determination method for wireless system

    Publication Year: 1999, Page(s):177 - 179
    Cited by:  Papers (10)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (50 KB)

    A new spread-spcetrum-based synchronization and geolocation method is presented. The synchronization method is based on determining the round-trip time between nodes. By using a spread-spectrum technique, delays of processing handshaking messages and switching transceivers from receiving mode to sending mode do not incur any inaccuracy. The geolocation method integrates our synchronization techniq... View full abstract»

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  • Memory truncation and crosstalk cancellation in transmultiplexers

    Publication Year: 1999, Page(s):180 - 182
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (62 KB)

    This article addresses the design of linear networks that reduce intersymbol interference and crosstalk in transmultiplexers. The proposed filter design method is based on the maximization of the signal-to-noise ratio at the detector input, defined for channel memories being truncated to arbitrarily short lengths. Thus, low-complexity Viterbi (1986) detectors working independently for all data cha... View full abstract»

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  • Integrated cell and frame switching in ATM networks

    Publication Year: 1999, Page(s):183 - 184
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (20 KB)

    Based on the per-VC queueing architecture, we propose a new technology to integrate cell and frame switching in asynchronous transfer mode (ATM) networks. We demonstrate that we can switch both fixed-length cells and variable-length frames inside the same switch at the same time. The insight is to recognize that we can store not only fixed-length cells, but also variable-length frames in each VC q... View full abstract»

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  • Dynamically reducing retransmission control for slow-frequency-hopped communication systems

    Publication Year: 1999, Page(s):185 - 187
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (97 KB)

    A dynamically reducing retransmission control scheme is proposed for slow-frequency-hopped communication systems. In the proposed scheme a transmitter defers transmission of a new packet until all the other transmitters receive positive acknowledgments, so that the number of active transmitters are dynamically reduced. The performance of the proposed scheme is compared with the conventional scheme... View full abstract»

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  • Decentralized optimal flow control with constrained source rates

    Publication Year: 1999, Page(s):188 - 190
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (87 KB)

    We study optimal flow control in multiservice networks, in which users (controllers) optimize their performance objectives in a decentralized manner. We adopt a model that differs from previously considered ones in that a user's strategy (viz., flow or average rate) is constrained between two numbers: those are specified by the user's quality of service (QoS) requirements or by the user's technolo... 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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Meet Our Editors

Editor-in-Chief
Octavia Dobre
Memorial University, Canada