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Influence of noise on a novel RMS delay spread estimation method

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2 Author(s)
Witrisal, K. ; Centre for Wireless Peronal Commun., Delft Univ. of Technol., Netherlands ; Bohdanowicz, A.

This paper describes the influence of noise on a previously proposed measurement method for wide-band, Rayleigh- and Ricean-fading radio channels. As the original procedure exploits the proportionality between the level crossing rate in the frequency domain (LCRf) and the RMS delay spread of the channel, the influence of noise on the LCRf is investigated and evaluated here. A compact solution is given for the noise-influenced case, which requires only one parameter, additional to those from the original procedure. However, we observe that the continuous-time (and -frequency) model used to obtain this solution yields a bias of the theoretical result against the ones obtained from the measurements, since they are discrete in frequency. Therefore, for the Rayleigh fading case, the discrete-time LCR is derived to identify the source of this bias. It is seen that the analytical result is not very suitable for being applied to a measurement procedure. It can be used however, to quantify the influence of noise in a particular situation and to assess noise-reduction techniques that might be required

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Personal, Indoor and Mobile Radio Communications, 2000. PIMRC 2000. The 11th IEEE International Symposium on  (Volume:1 )

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