External Site (Prediction Result)

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.