You are here: Manual / Simulation/ Probabillity Of Interference

---

Calculating probability of interference

After the simulation of events had been completed by the EGE, the Seamcat workspace will have obtained and stored the vectors of wanted (dRSS) and unwanted (iRSS) signals. The user then may proceed to use the facilities of the Interference Calculation Engine (ICE) in order to evaluate the probability of interference for the simulated scenario.

The probability of interference could be calculated by ICE with reference to the following choice of input parameters:

• Calculation mode: compatibility or translation
• Which type of interference signal is considered for calculation: unwanted, blocking, intermodulation or their combination
• Interference criterion: C/I, C/(N+I), (N+I)/N or I/N

When the Translation mode is chosen, the user may calculate and display as chart the probability of interference as function of one of the following input parameters:

• Output power of Interfering transmitter
• Blocking response level of Victim receiver
• Intermodulation response level of Victim receiver

The following information on the interference criteria can be found in details here (10 pages).

• METHODOLOGY ASSOCIATED TO THE (C/I) CRITERION
• PROBABILITY OF INTERFERENCE
  • Compatibility calculation mode
  • Translation calculation mode
• ICE Control Parameters
  • ICE Graphical User Interface
  • Interference Calculation Engine Control
  • Interference Calculation Engine
  • Interference criteria C/I, C/(N+I), (N+I)/N ,I/N relationship

The ICE interface may be found by pressing on the Interference Calculations tab, which will open the following dialog window:

The average of the graph depends of the number of points, but the higher the number is, the longer the calculations are.

ID	Description	Comments
1	Calculation mode/Compatibility: The result is a probability of interference.	Compatibility: Gives the probability of being interfered by the Blocking interference and/or by the Unwanted interference and/or by intermodulation interference.
2	Calculation mode/Translations: the result is a graph.	In this case all the following parameters should be independent from frequencies: Receiver blocking response mask, Receiver intermodulation rejection mask, power distribution of interfering transmitter, Unwanted emission floor mask. Calculation of the probability of interference as a function of the reference parameters (Power supplied by the It for the unwanted, Blocking response level of the Vr for the Blocking, And intermodulation rejection level for the Vr). These parameters are varying on user-defined definition domain defined by the number of points where the software has to calculate the probability.
3	Signal type	Choose the interference studied: Unwanted and/or Blocking and/or Intermodulation.
4	Algorithm	formerly known as “Complete 1”
5	Samples	It represents the number of events to calculate the probability from. The accuracy of the probability results derives from this parameters.
6	Interference criterion	Choose between C/I, C/(N+I), (N+I)/N, I/N)
7	Translation parameters: If translation was chosen	Number of points between the min and max, where the software will calculate the probability.
8	Calculation control	Delete a result, and see the last results
9	Result/Compatibility?	Probability of interference: 1 - always interfered, 0 - never interfered
10	Result/Translation?	Gives the graph, showing the resulting probability of interference vs. the selected values of translation parameter.