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4.2.2 4.2.2

In this calculation mode the function block_{Max Interf Signal} (Df) that you entered represents the absolute power level (in dBm) of maximum interfering signal (maximum acceptable interfering power), which might be tolerated by the receiver at a given frequency separation (see Figure 12see A8.7).

In this case SEAMCAT calculates the receiver attenuation, Attenuation (Df), to be applied to the interfering signal by using the following expression:

                    

Unit
body Attenuation(

...

Df) =

...

blockMax Interf Signal (

...

Df) (dBm) -

...

sensVLR (dBm) + C/(N+I) (dB) – I/N (dB)

...

  (Eq. 23)

where:

• Df = (f_ILT - f_VLR) is the frequency separation;
• sens_VLR is the sensitivity of the VLR (dBm) as defined in the simulation scenario.

 

To achieve a realistic value, you may define the sensitivity (sens_VLR) as (see the figure below):

...

Sensitivity = -110 dBm + 16 = -94 dBm

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Figure 107 Image Added

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F103 F103

 Figure 103: Setting up the sensitivity in SEAMCAT

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iRSS_blocking = Interfering Signal Level (f it )= -54.5 - 150 = -204.5 dBm        

 

This can be checked by running a simulation and displaying the iRSS_blocking in case of Sensitivity mode calculated by SEAMCAT see Figure 108104.

  

Figure 108

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F108 F108

Figure 104: Mean iRSS_blocking in case of Sensitivity mode