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IEEE Communications Letters

Issue 2 • Feb. 1998

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Displaying Results 1 - 9 of 9
  • Fast-acquisition algorithm for joint maximum-likelihood data and bit synchronization epoch estimation in burst direct-sequence spread-spectrum transmission

    Publication Year: 1998, Page(s):33 - 35
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (91 KB)

    We develop a fast-acquisition simplified joint maximum-likelihood (ML) estimation algorithm of the bit synchronization epoch and data bit values for a short-burst direct-sequence spread-spectrum (DSSS) transmission, in a white Gaussian noise environment. With respect to the optimal algorithm, the simplified procedure reduces the computational cost by more than one order of magnitude at no accuracy... View full abstract»

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  • Impulse radio: how it works

    Publication Year: 1998, Page(s):36 - 38
    Cited by:  Papers (1509)  |  Patents (88)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (97 KB)

    Impulse radio, a form of ultra-wide bandwidth (UWB) spread-spectrum signaling, has properties that make it a viable candidate for short-range communications in dense multipath environments. This paper describes the characteristics of impulse radio using a modulation format that can be supported by currently available impulse signal technology and gives analytical estimates of its multiple-access c... View full abstract»

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  • A new twist on the Marcum Q-function and its application

    Publication Year: 1998, Page(s):39 - 41
    Cited by:  Papers (71)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (140 KB)

    A new form of the Marcum (1950) Q-function is presented that has both computational and analytical advantages. The new form is particularly useful in simplifying and rendering more accurate the analysis of the error probability performance of uncoded and coded partially coherent, differentially coherent, and noncoherent communication systems in the presence of fading. It also enables simple upper ... View full abstract»

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  • Differential detection of turbo codes for Rayleigh fast-fading channels

    Publication Year: 1998, Page(s):42 - 44
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (68 KB)

    The performance of turbo codes using differentially detected quadrature phase-shift keying (QPSK) signals transmitted over Rayleigh fast-fading channels is investigated. So far in the open technical literature dealing with turbo codes only slow fading has been considered. Our research has shown that the use of a simple differential detector in conjunction with turbo codes can generally outperform ... View full abstract»

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  • On movement-based mobility tracking strategy-an enhanced version

    Publication Year: 1998, Page(s):45 - 47
    Cited by:  Papers (29)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (130 KB)

    An enhanced version of the movement-based location update with selective paging strategy proposed by Akyildiz, Ho and Lin (see IEEE/ACM Trans. Networking, vol.4, p.629-38, 1996) is presented. Although the terminal paging cost is slightly increased, a significant reduction in the location update cost is achieved. The net effect is, for low call-to-mobility ratio, a saving of around 10%-15% in the t... View full abstract»

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  • Excess bandwidth is necessary for ISI-free double-filter receivers

    Publication Year: 1998, Page(s):48 - 50
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (106 KB)

    Previous work has indicated that highly effective double-filter receivers can be implemented for phase-shift keying (PSK) transmissions over linearly time-selective fading channels provided that the transmitter and receiver filters have root-raised-cosine transfer functions with unity rolloff factor. Revisiting the detection problem within the frame of maximum-likelihood (ML) sequence estimation w... View full abstract»

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  • On the robustness of ultra-wide bandwidth signals in dense multipath environments

    Publication Year: 1998, Page(s):51 - 53
    Cited by:  Papers (364)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (92 KB)

    The results of an ultra-wide bandwidth (UWB) signal propagation experiment, using bandwidth in excess of 1 GHz, performed in a typical modern office building are presented. The robustness of the UWB signal in multipath is quantified through cumulative distribution functions of the signal quality in various locations of the building. The results show that an UWB signal does not suffer multipath fad... View full abstract»

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  • Phase jitter/spl equiv/timing jitter?

    Publication Year: 1998, Page(s):54 - 56
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (77 KB)

    In digital communication systems, the periodicity of timing signals is often disturbed. While timing jitter has been adopted by the International Telecommunication Union (ITU) as the standardized measurement for such disturbances, phase jitter is often used instead in much of the current relevant literature. The fundamental concepts of timing jitter and phase jitter are examined and definitions ar... View full abstract»

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  • Bias terms in the optimal quadratic receiver

    Publication Year: 1998, Page(s):57 - 58
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (70 KB)

    The bias terms in the likelihood functions of the optimal quadratic receiver are compared. In a Rician-fading frequency-nonselective channel with additive white Gaussian noise (AWGN) the terms are identical, and can be neglected if the transmitted signals have identical envelopes. In diversity systems including the RAKE the channels may have correlation and different average powers but no crosstal... 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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Editor-in-Chief
Octavia Dobre
Memorial University, Canada