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If the TETRA cell is a traffic limited network and the density of terminals is equal to 5 terminals per km², then the coverage radius is given by the following formula (see ERC Report 68 or User Documentation):

Image Removed     (Eq. 252

Mathinline
body$R_{max}^{wt}=\sqrt[{}]{\frac{{{n}_{channels}}\ {{n}_{userperchannel}}}{\pi \ den{{s}_{max}}cluste{{r}_{frequency}}}}$
  (Eq. 261)

The radius of the cell of the interfering system is given by

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Figure 534 describes a TETRA network based on the above assumptions.


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F0542
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F0542
Figure 534542: TETRA network based on these assumptions

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   = radius of the area where interferers are uniformly spread

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Mathinline
body${{R}_{simu}}=\sqrt{\frac{{{n}^{active}}}{\pi \ \ dens_{it}^{active}}}$
   (Eq. 253262)

We have to consider 9 active interferers with a density of 5 terminals/km². Then the radius of simulation area results in:

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  • The wanted signal within the defined bandwidth corresponding to a frequency offset of ± 50 % of the emission bandwidth ItBW;
  • The out-of-band emission caused by the modulation within, e.g. ± 50...250 % of ItBW;
  • The spurious emission outside these ranges.

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This means the mask to be defined has to cover this whole range. This allows co-channel consideration as well.

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