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

WINNER D5.4 v. 1.4
When adjusting the PL curves of the models to closely follow the measured over-all curve, the following
actions were needed:
1. Cost231-Hata: Subtract 15 dB and apply h BS = 50 m (instead of the 25 m). I.e. use an effective
BS antenna height h BS + 25 m.
2. Erceg: Apply h BS = 60 m. I.e. use an effective BS antenna height h BS + 35 m.
Both models could be used, after these modifications. The subtraction of 15 dB needed with the
COST231-Hata model is caused by the fact that the model is not originally planned for rural
environments, but for urban and suburban environments.
5.6.2 Power-delay profile
5.6.2.1 Scenario A1
The PDP at a corridor to corridor environment is modelled as a decaying exponential. The measured PDP
has a spike that can be identified coming due to a reflection from the end of the corridor, see Section
5.4.7.1. In our model we have neglected it, because the delay of the spike depends on the location of the
BS in the corridor. The constants of the decay have been determined in the same paragraph. It is relatively
easy to extend the model to include the spike, when the location of the BS is fixed. However, it is not
included in the current model. This is justified by the model simplicity and also the relative low level of
the measured spike. For the corridor to room environment the model fits quite well in the exponential
model.
5.6.2.2 Scenario B5a
The power-delay profile (of all paths except the direct) is set as exponential, based on the results in
[OBL+02] and [SCK05].
5.6.2.3 Scenario B5b
The power-delay profile (of all paths except the direct) is set as exponential, based on the results in
[SMI+00]. A per-path shadow fading of 3 dB is used to obtain some variation in the impulse responses.
5.6.3 Delay spread
5.6.3.1 Scenario B5a
The RMS-delay-spread is set to 40 ns, based on [PT00]. In order to have a valid model, it requires beamwidths
comparable to those employed in [PT00].
5.6.3.2 Scenario B5b
Based on the delay-spread formula in [MAS02] i.e.
s
[ ns] exp( β )
= (5.72)
we select the delay spread to be 30 ns when the path loss is less than 85 dB, 110 ns when the path loss is
between 85 dB and 110 dB, and finally 380 ns when the path loss is greater than 110 dB. With these
settings the delay-spread used here is a factor 40%-156% of the delay-spread formula of [MAS02] for
path losses up to 137 dB. We call these path-loss intervals range1, range2 and range3 and different
clustered-delay line models will be provided for the three cases.
5.6.3.3 Scenario C1
In the C1 LOS suburban scenario we model the PDP with a single exponential. It can be seen that another
exponential cluster could be included in the PDP. For the same reason as in the scenario A1 it was
decided to be neglected.
5.6.3.4 Scenario D1
In the D1 scenario the PDP is best modelled with two decaying exponentials in both LOS and NLOS
propagation conditions, i.e. with a dual-slope model. However, also now we model the PDP was decided
to be modelled with a single exponential in both cases. In the LOS conditions the first part is modelled
with one spike and the second part with an exponential.
In the NLOS conditions a single slope model is fitted to the measured PDP for simplicity. The fitting is
performed to preserve the modelled RMS-delay spread equal to the measured one.
PL dB
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