Based on the definition and measurement procedure of blocking, it is possible to obtain the receiver attenuation parameter a_VLR(Df) from the following fundamental relationships between wanted and unwanted signals, receiver sensitivity and noise, as observed when blocking event is triggered:

Figure 397: Relationship between signal levels when blocking occurs (Protection Ratio and Sensitivity modes)

Note: the coloured arrows show the relationship of the input parameters used for the calculation of the resulting blocking response (a_VLR(∆f)) and described in the sections above.

Examples:

VLR noise floor: -114 dBm

sensitivity: -98 dBm

C/(N+I): 16 dB

I/N: -6 dB

(N+I)/N 1 dB

a) blocking mode "Sensitivity"
limit: -45 dBm

b) blocking mode "Protection ratio"

limit: 52 dB

75 dB

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