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4.7.1
4.7.1
The number of active transmitters that will be uniformly located within the simulation radius is given by:

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body{{n}_{active}}=den{{s}_{transmitter}}.pro{{b}_{transmission}}.\pi \ {{\left( R_{simulation}^{{}} \right)}^{2}}
              (Eq. 28)


Figure

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120 presents the GUI with the input value.

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Settings in the System tab

Settings in the Scenario tab

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F120
F120
Figure 120: Setting up the simulation radius in SEAMCAT

(Note that the results of the simulation radius is displayed only after running simulation)


The simulation radius is calculated by using the following formula:


                                          

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body$R_{simu}^{{}}=\sqrt[{}]{\frac{{{n}_{active}}\ }{\pi \ dens_{it}^{active}.pro{{b}_{transmission}}}}$
         (Eq. 29)         



In the example of Figure

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120, this gives:

                                    

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Figure 125

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bodyR_{simu}^{{}}=\sqrt[{}]{\frac{1}{\pi \ \times 10\times 1}}$= 0.178 km


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F121
F121
Figure 121: iRSS using the simulation radius for 1 active transmitter (R=0.178)


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F122
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Figure 126122: Calculated simulation radius with 1 active transmitter

Then for a single interefering link transmitter located at the edge of the simulation radius (R = 0.178 km), the iRSSunwanted may be calculated:

                  

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bodyiRSSunwanted = 33 (dBm) + 11 + 9 - (32.5 + 10 log(0.178^2) + 20 log(1000)) = -24.5dBm

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When increasing the number of active transmitters to 10 (see Figure 127123), the simulation radius becomes:

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bodyR_{simu}^{{}}=\sqrt[{}]{\frac{10}{\pi \ \times 10\times 1}}$= 0.564 km

Then, for a single interefering link transmitter located at the edge of that simulation radius (R = 0.564 km), the iRSSunwanted resulting from this terminal may be calculated as:iRSSunwanted

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bodyiRSSunwanted = 33 (dBm) + 11 + 9 - (32.5 + 10 log(0.564^2) + 20 log(1000)) = -34.

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5dBm
      

If 10 active terminals are located at the edge of the simulation radius, the iRSSunwanted may be calculated in the following way:

                                          

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body iRSSunwanted = -34.6 (dBm) + 10 log(10) = -24.5 dBm

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Then the iRSSunwanted should be above -24.5 dBm as shown on Figure 128124.


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F123
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Figure 127123: Setting up the simulation radius in SEAMCAT with a different
number of active transmitters


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F124
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Figure 128124: iRSS using the simulation radius calculated for 10 active interferers (R=0.564 km)


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F125
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Figure 129125: Calculated simulation radius with 10 active transmitters

 

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