Section 1.4 presented the concept of interference criteria (C/I, C/(N+I), (N+I)/N, I/N) when the victimis a generic system. The consistency between these values is under your responsibility and that only one at a time is used in the interference calculation.
It is important to remember that these parameters are also used in the evaluation of the two blocking modes (Protection ratio and Sensitivity) as presented in See section 1.4.5.
SEAMCAT performs a consistency checking between the interference criteria as explained in ANNEX 3:.
Table 13: Interference criteria panel GUI
Description | Symbol | Type | Unit | Comments |
Interference criteria | C/I C/(N+I) (N+I)/N I/N | S | dB | You can define at least one of these criteria. ( C/I, C/(N+I), (N+I)/N, I/N). Then, you will choose one of these criteria for each interference probability calculation. |
Calculate interference criteria | - | calculator | - | This feature allows you to evaluate the consistency between the entered interference criteria and proposes alternative solution that you can select. |
The “calculate interference criteria” is a user friendly calculator for the interference criteria. It avoids conspicuous calculations, to increase the transparency and to avoid consistency check warnings because of the use of inconsistent sets of interference criteria values.
The calculation and selection of a consistent set of interference criteria is implemented. The calculator opens with the existing values in the interference criteria fields of the workspace. A checkbox (default: ON) allows to force the consistency of the C/(N+I) value with the workspace, i.e. the values ‘Noise floor’ and ‘Sensitivity’. The relation between the values is given in the formula C/(N+I) [dB] = Sensitivity [dBm] – Noise floor [dBm]
The Interference Criteria Calculator displays all possible sets of consistent interference criteria rounded to one decimal. The same set is displayed only once. As a consequence of rounding, the displayed sets are differ at least 0.1 dB in one of the four values.
When you select the column of values you want and click ok, the values are copy/pasted to the “Interference criteria” panel.
Figure 149: : Interference criteria calculator GUI