Final report on link level and system level channel models - Winner

WINNER D5.4 v. 1.4
Cumulative Distribution Functions of the RMS-delay spread are given in the Figure 5.24 a and b below
for the 5.25 GHz centre-frequency and c-c LOS and r-c NLOS propagation conditions. Best fit is
achieved with the log-normal distribution.
a
Figure 5.24: a) CDF of the A1 indoor (corridor – corridor) LOS environment, fitting to normal,
Gumbel and logistic distributions shown. b) CDF of the A1 indoor (room – corridor) NLOS
environment, fitting to normal distribution shown.
b
5.4.3.2 Scenario B1
The mean RMS delay spread for LOS and NLOS cases has been calculated for large number of channel
segments. The mean value of each channel segment has been calculated for data collected of every 10λ,
where about five channel impulse responses has been measured per wavelength. Fitting the log of the
measured RMS delay spread with different distributions is shown in Figure 5.25. For NLOS case, the
lognormal distribution is not very close to measurement data as well as the log-logistic distributions. For
LOS case, the Gumbel distribution follows most of the points of the measurement CDF. The closest
distribution is the Gumbel distribution, which is a special case of the Fisher-Tippett Distribution. It is
particularly convenient for extreme values data. It may be used as an alternative to the normal distribution
in the case of skewed empirical data.
(a) LOS
Figure 5.25: RMS delay spread in Scenario B1.
(b) NLOS
Figure 5.26 shows the maximum excess delay for both LOS and NLOS propagation conditions. Table 5.9
presents mean and standard deviations of both RMS delay spread and the ZDSC excess delays for both
LOS and NLOS cases.
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