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

WINNER D5.4 v. 1.4
G ( ϕ
,m
) is the antenna gain of receiver (MS) for the mth ray within the nth ZDSC.
r
d s
d u
k
n
is the distance between antenna elements of the linear array at transmitter.
is the distance between antenna elements of the linear array at receiver.
is the wave number.
Φ
n,m is the phase of the mth ray within the nth ZDSC.
v
is the speed of the MS.
θ
v
is the angle of the MS velocity vector.
If cross-polarisation is considered, additional cross polarized rays per each ZDSC are generated with
same angle and delay information as those of the co-polarized rays described earlier but different random
xy ,
phases ( Φ ) from uniform distribution U(0°,360°). The complex field pattern at transmitter and
mn ,
receiver for vertical polarisation
receiver
h
F
t
,
h
r
v
F
t
,
v
F
r
respectively, and for horizontal polarisation for transmitter and
vh
F , respectively. The cross-polarized amplitude from vertical to horizontal ( κ
mn , ) or
hv
horizontal to vertical κ
mn , for each ray within each ZDSC are calculated from their corresponding XPR
values given by lognormal distribution of parameters given in Table 3.6 for different scenarios. The κ is
selected for every ray with each cluster from indpenent lognormal distribution with parameters given in
Table 3.3. It is assumed that the XPR random variables of different rays are independent from angles and
delays. The channel coefficient with polarization can be calculated as given in [3GPP SCM] as
h () t = Pσ
usn , ,
n SF
M
∑
m = 1
( φ )
( φ )
( ϕ )
( ϕ )
T
⎛ v
v
⎡
vv vh vh
F ⎤
t m, n ⎡exp( j
mn ,
) κ
m, n
exp( j
,
) ⎤ ⎡F
⎤ ⎞
⎜
Φ
Φ
mn r m,
n
⎢ ⎥ ⎢
⎥ ⎢ ⎥⋅⎟
⎜ h
hv hv hh
h
⎢Ft mn ,
⎥ ⎢κ
mn ,
exp( jΦ m, n) exp( jΦ mn ,
) ⎥ ⎢Fr mn ,
⎥ ⎟
⎜⎣ ⎦ ⎣
⎦ ⎣ ⎦ ⎟
⎜
⎟
⎜
⎟
jkds sin( φmn , ) jkdu sin( ϕm, n ) jk v cos( ϕm,
n−θv
) t
⎜
e e ⋅ e
⎟
⎜
⎟
⎜
⎟
⎝
⎠
(3.28)
For LOS ray (not cluster), the off-diagonal elements of the polarization matrix are zero by definition, i.e.,
the XPR (given by the two κ) is infinity for the LOS ray.
3.2 Reduced variability “clustered delay line” model
This channel model is somehow different from the conventional tapped delay line models in a sense that
fading within each tap is generated by a sum of sinusoids i.e., the rays within the cluster of that tap.
However, it is based on similar principles of the ZDSC channel modelling approach. Clustered delay line
(CDL) model is composed of a number of separate delayed clusters. Each cluster has a number of
multipath components (rays) that have the same known delay values but differ in known angle of
departure and known angle of arrival. The cluster’s angle-spread may be different from that of BS to that
of the MS. The offset angles of the rays depend on the angles spread at BS or MS and are calculated as
shown in Table 3.10. The offset angles represent the Laplacian PAS of each ZDSC. The average power,
mean AoA, mean AoD of clusters, angle-spread at BS and angle-spread at MS of each cluster in the CDL
are extracted or estimated from measurement results at 5 GHz and chip frequency (f c ) of 100 MHz for
Scenarios A1, C2 and D1, and f c =60 MHz for scenario B1 or obtained from literature as in Scenario B5.
In the CDL model each ZDSC is composed of 10 rays with fixed offset angles and identical power. In the
case of ZDSC where a ray of dominant power exists, the ZDSC has 10+1 rays. This dominant ray has a
zero angle offset. The departure and arrival rays are coupled randomly. The CDL table of all scenarios of
interest are give below, where the ZDSC power and the power of each ray are tabulated. The CDL models
offer well-defined radio channels with fixed parameters to obtain comparable simulation results with
relatively non-complicated channel models.
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