WINNER II pdf - Final Report - Cept

WINNER II D1.1.2 V1.2
In the LOS case substitute (4.12) by (4.13) to enforce the first cluster to the LOS direction ϕ LOS
X ' + Y − X + Y − . (4.11)
ϕ
( ϕ ) ( ϕ ϕ )
n
= '
n n n n 1 1
Finally add the offset angles α m from Table 4-1 to cluster angles
ϕ
n
= ϕ + c α
LOS
, m n AoA m
, (4.12)
where c AoA is the cluster-wise rms azimuth spread of arrival angles (cluster ASA) in the Table 4-5.
Table 4-1 Ray offset angles within a cluster, given for 1° rms angle spread.
For departure angles φ n the procedure is analogous.
Ray number m Basis vector of offset angles α m
1,2 ± 0.0447
3,4 ± 0.1413
5,6 ± 0.2492
7,8 ± 0.3715
9,10 ± 0.5129
11,12 ± 0.6797
13,14 ± 0.8844
15,16 ± 1.1481
17,18 ± 1.5195
19,20 ± 2.1551
Step 7b If the elevation angles are supported: Generate elevation arrival angles ψ and elevation
departure angles γ.
Draw elevation angles with the same procedure as azimuth angles on Step 7. Azimuth rms angle
spread values and cluster-wise azimuth spread values are replaced by corresponding elevation
parameters from Table 4-6.
Step 8: Random coupling of rays within clusters.
Couple randomly the departure ray angles φ n,m to the arrival ray angles ϕ n,m within a cluster n, or
within a sub-cluster in the case of two strongest clusters (see step 11 and Table 4-2).
If the elevation angles are supported they are coupled with the same procedure.
Step 9: Generate the cross polarisation power ratios (XPR) κ for each ray m of each cluster n.
XPR is log-Normal distributed. Draw XPR values as
10
κ , (4.13)
,
10 X
m n
=
where ray index m = 1,…,M, X ~ N(σ,µ) is Gaussian distributed with σ and µ from Table 4-5 for
XPR.
Coefficient generation:
vv vh hv hh
Step 10: Draw the random initial phase { Φ , Φ Φ }
Φ for each ray m of each cluster n and
n, m, n,
m n,
m,
n,
m
for four different polarisation combinations (vv,vh,hv,hh). Distribution for the initial phases is uniform,
Uni(-π,π).
vv hh
In the LOS case draw also random initial phases { Φ }
Φ for both VV and HH polarisations.
LOS
,
LOS
Step 11: Generate the channel coefficients for each cluster n and each receiver and transmitter element
pair u,s.
For the N – 2 weakest clusters, say n = 3,4,…,N, and uniform linear arrays (ULA), the channel
coefficient are given by:
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