|
|
Multi-Layer Fieldstrength Prediction
|
|
For each pixel (receiving point) in the scenario the
field strength (and apth loss) is predicted.
WinProp is able to simultaneously predict on several prediction
heights. The user is able to navigate through the predicted layers in
order to determine the best
installation height for the subscriber antennas of the fixed WiMAX user
equipments.
Figure 1: Field strength
prediction above roof top level.
Figure 1
shows a small part of a large city, where two sites for a WiMAX network
were installed. The carriers are both in the 3.5
GHz frequency band.
The sites are installed at a distance of approx. 500
meters. Both sites consist of three 60 degree sector
WiMAX
antennas (Sira 3.5 WLL 17-60).
One site is mounted 20 meters above
the ground, the other one is mounted 30 meters
above the ground.
The antennas have no downtilt, the
transmit
power was 43 dBm.
In order to determine the best installation
height of the subscriber antennas, three prediction heights were
computed. Figure 1 shows the field strength prediction results for the
different height levels in the simulation area for one sector of one
site.
|
|
Detailed Result View
|
|
|
|
|
|
Figure 2a:
Field strength prediction on height level one, 15 meters above the
ground.
|
Figure 2b:
Field strength prediction on height level two, 25 meters above the
ground. |
Figure 2c:
Field strength prediction on height level three, 35 meters above the
ground. |
|
|
|
The red circles denotes
a
specific user location, where a fixed WiMAX subscriber antenna should
be installed.
WinProp offers a convenient way for the determination of the best
height for
installing
the antenna.
Figure
2 shows the field
strength prediction of the simulated heights, which are 15, 25 and 35
meters
above the ground.
Due to shadowing effects of the buildings located between the base
station and the subscriber antenna, the
received
field strength 15 meters above the ground (figure 2a)
is significantly lower. According to figure 2c,
the field strength 35 meters above the ground would
be more than 20 dB higher compared to the 15 meters installation.
|
|
|
|
|
|
|
|
Download
a
presentation about WiMAX Network Planning
|
|
