For network planning projects, interference from external sites can be included in
the considerations for cell assignment and transmission modes.
On the Transmitter Type dialog, select External Site
(Prediction Result) and click OK to display the
External Interference dialog (see Figure 1).Figure 1. The External interference dialog.
As shown in Figure 1, two pairs
of options exist, Strength of Signal and Type of
Signal.
Strength of Signal
Constant signal power
When this options is selected, you are asked to provide a power
level in dBm. For instance, a transmitter outside the prediction
area may produce a power level in the prediction area of
-70 dBm. As an approximation, for example, because the
transmitter is far outside the prediction area, the power level
is assumed to be independent of location within the prediction
area.
Signal power defined in result file
An actual propagation simulation result was obtained in another
WinProp project. You can point
to the .fpp file in which that result is
stored. The prediction areas do not need to be identical. This
can be useful in co-existence studies, for example, when a
Bluetooth network interferes with a Wi-Fi network. Each network
has its ProMan project (one air
interface per project), but interference between networks can be
included with this option.
Type of Signal
In-band Interference
The drop-down list is a list of carrier
frequencies in the network of interest. When the interfering
transmitter operates at one of those carrier frequencies, it
will affect the transmitters in the network of interest that
also operate at that specific carrier frequency.
Out-of-band Interference
An interfering signal that is not at any of the carrier
frequencies used by the network of interest, is considered out
of band. That means that its interfering power, whether constant
or from a .fpp file, can be suppressed with
a band-pass filter. When this option is selected, you are asked
to specify the additional attenuation produces by the filter,
for example, 30 dB.