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  • 1
    Electronic Resource
    Electronic Resource
    PN-spread spectrum system behavior in a highly impulsive noise environment (1987)
    Springer
    Electrical engineering 70 (1987), S. 383-387 
    Details
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Übersicht In der vorliegenden Arbeit wird das Verhalten des Pseudorauschens (PN)-ausgebreiteten Spektrumsystems bei Vorhandensein eines hoch impulsiven plus Gausschen Rauschkanals behandelt. Sowohl bei experimentellen als auch unter realen Bedingungen wurde bei Untersuchungen einesPN=ausgebreiteten Spektrumsystems festgestellt, daß das Rauschen, wenn es sich um den lokalenPN-Code des Empfängers vervielfacht, sich die spektrale Rauschdichte entsprechend vermindert. Das führt zu einer bedutenden Verbesserung des Signal-Rausch-Verhältnisses des Systems für einen gegebenenBER-Wert. Auf diese Weise wird gezeigt, daß die Technik ausgebreiteten Spektrums dazu beitragen kann, die Zuverlässigkeit der Nachrichtenübertragung selbst bei komplexen impulsiv verrauschten Kanälen zu verbessern.
    Notes: Contents In the present work the behavior of a Pseudo Noise (PN)-Spread Spectrum system in the presence of a highly impulsive plus Gaussian noise environment is studied. In apraising the acquisition or tracking performance of aPN-spread spectrum system, it was noticed that the noise process when multiplied by the receiver's localPN-code is spectrally spread with a resultant decrease in the noise spectral density. This leads to a significant improvement of the system signal to noise ratio for a given Bit Error Rate (BER), demonstrating so that spread spectrum techniques can provide reliable communications even in such complex impulsive noise environments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01574006
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Solar-cycle variation of the daily foF2 and M(3000)F2 (1998)
    Springer
    Annales geophysicae 16 (1998), S. 1039-1042 
    Details
    ISSN: 0992-7689
    Keywords: Electromagnetics (Guided waves) ; Ionosphere (Ionospheric disturbances) ; Radio Science (Radio wave propagation)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Daily values of the ionospheric characteristics foF2 and M(3000)F2 for a given hour and month are correlated with the corresponding daily values of sunspot number using measured data collected at seven European locations. The significance of applying different-order polynomials is considered and the times are confirmed when the higher-order terms are important. Mean correlation coefficients for combined data sets over all hours, months and stations are determined, together with the standard errors of estimates. Comparisons are made with corresponding figures for monthly median values derived from the same data sets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-998-1039-0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The Effect of Metric Modification on the Performance of TCM and Concatenated Systems Over Rayleigh Fading Channels (2000)
    Springer
    International journal of wireless information networks 7 (2000), S. 167-175 
    Details
    ISSN: 1572-8129
    Keywords: Fading channels, Trellis coded modulation, concatenated coding, differential phase shift keying, interleaved coding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The performance improvement of conventional TCM schemes over frequency nonselective slow Rayleigh fading channels, caused by a slight modification on the metric calculation of the Viterbi decoder, is investigated in this paper. A statistical analysis of the Euclidean distances at the input of the Viterbi decoder is carried out to explain this improvement. Furthermore, the performance improvement of two concatenated coding systems incorporating the above modification, under the same conditions, is studied. The performance of the TCM and the concatenated systems is evaluated by Monte Carlo simulation. The results show that the examined systems, using the proposed modification on the metric calculation, achieve BER performances comparable to other codes and systems, especially designed for fading channels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009593612908
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    Paper (German National Licenses)
    Fulltext
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