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1.2.8 1.2.8

Desensitisation (D) of the receiver in the presence of an interfering signal, given in dB, corresponds to the ‘noise rise’ or ‘noise augmentation’ due to the interfering signal and is derived by the following equation in dB:

 

...

                                         

Unit
body D = 10.

...

log10[(i + n)/n]

...

                                                                         (Eq. 8)

and is equivalent in the linear domain to:

                                          

Unit
body D = 10.

...

log10[(10(N/10) + 10 (I/10))] – N

...

                                                       (Eq. 9)

 

To ensure proper operation, the receiver is designed to include a margin equal or lower than D which allows it to tolerate a certain level of interference (I) in the listened channel. This can be caused by co-channel and/or non-co-channel interference sources.

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noting that in linear domain it is equivalent to: 

                                           i / n = [(i + n) / n] - 1 = 10^D/10 – 1                                                          (Eq. 11)