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Figure 382384: Illustration of the non-ideal receiver filter with respect to an ideal Anchor F382F384F382 F384
interfering link transmitter
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- User-defined:the values of the blocking mask are expressed directly as a Blocking response (filter selectivity) in relative positive values (dB) (see Figure 12);
- Protection ratio:
the values of the blocking mask are expressed in relative positive values (dB);
SEAMCAT considers the underlying protection criterion applied by the measurement procedure of used in typical standards when calculating the resulting blocking response - Sensitivity:
the values of the blocking mask are expressed in absolute power levels (dBm);
SEAMCAT considers the underlying protection criterion applied by the measurement procedure used in typical standards when calculating the resulting blocking response
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For cellular systems, if blocking is spsecified as ACS (Adjacent Channel Selectivity), then it is effectively the same as the User-defined mode for generic systems.
In all cases SEAMCAT perceives receiver blocking as a mask, which is a function of frequency separation between interfering and desired signals Δf=(fILT-fVLR), however you may also specify a constant value of blocking across the whole frequency range.
Figure 383385: BlockingAnchor F383F385F383 F385
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When calculating the value iRSSblocking, SEAMCAT applies the obtained receiver attenuation value aVLR to the full power of the interfering signal and will consider the resulting power (interfering signal at receiver input less blocking attenuation) as in-channel noise floor increase of the VLR.
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