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

WINNER D5.4 v. 1.4
the behaviour is very similar at 2.45 and 5.25 GHz centre-frequencies. The maximum excess delays were
found to be roughly two to three times higher than the RMS-delay spreads.
Table 5.13: Percentiles of the RMS-delay spread in a rural environment.
Rms delay spread (ns) LOS NLOS
10% 2.5 4.3
Percentile
50% 15.4 37.1
90% 84.4 89.5
mean 36.8 42.1
5.4.3.5.2 Exceptionally long delays
The RMS delay spread as fuction of distance along the measurement route was discussed in [5.3]. One
example is shown in Figure 5.29. It can be seen that near 740 m from the start of the measurement route
there is an abrupt rise of the RMS delay spread. The delay spread jumps there from some tens of
nanoseconds up to 800 ns for a short interval, about 25 m. The reason is obviously a reflection from a
nearby radio mast.
900
800
700
Dealay spread (ns)
600
500
400
300
200
100
0
0 100 200 300 400 500 600 700 800 900
Distance (m )
Figure 5.29: RMS delay spread as a function of distance.
It should be noted that this kind of reflectors, e.g. radio masts and supporting pillars of power lines, are
quite common in our rural environments. However, the probability of reflections was not possible to be
estimated in our current campaign.
This kind of exceptionally delayed paths can not be modelled with the primary model with exponentially
distributed delay spreads. They have to be modelled as far clusters [SCM]. However, at the current model
this kind of exceptional phenomenon has been neglected.
5.4.4 Azimuth AS at BS and MS
Azimuth angle-spread is calculated like described in [3GPP SCM] from DoA and path power values. It is
known as circular angle-spread. Here it is calculated at both BS and MS link end.
5.4.4.1 Scenario A1
The cumulative distribution functions of the azimuth spreads at 5.25 GHz are shown in Figure 5.30 for
LOS and NLOS propagation conditions. The percentiles for the CDF functions for the angle-spreads are
shown in the table Table 5.14 below.
Table 5.14: Percentiles of the RMS azimuth spread.
Combined Corri.-Corri. LOS Corri.-Room NLOS
Tietotalo & Main building Azim. Elev. Azim. Elev.
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