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1.4.6
1.4.6
The level of interference due to receiver blocking , i.e. the power captured from the transmissions of the interferer due to selectivity imperfections of the victim’s receiver (Figure 12), is determined using the interferer’s transmit power, the victim link receiver’s blocking performance, the determined by the interferer’s transmit power, the antenna gains and propagation loss, is further decreased due to the receiver blocking performance for a given interferer/victim frequency separation, antenna gains and propagation loss. Details on the iRSSblocking calculation are given in ANNEX 5:.

Note that with from SEAMCAT 5.0.1 onwards, the blocking attenuation is computed at the ILT frequency and that the ILT bandwidth is nowconsidered (see ANNEX 8:). There are 3 ways to calculate the blocking response which are described in more detail in ANNEX 8::

User Defined (dB):           AttBlocking = BlockUD (dB)                                                                                                                                   (Eq. 13)

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Sensitivity Mode (dBm): AttBlocking = BlockSens (dBm) – SensitivityVLR (dBm) + C/(N+I) (dB) – I/N (dB)                                 (Eq. 15)


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F012
F012
Figure 12: Illustration of the blocking of the victim link receiver (i.e. total emission power of ILT reduced by the blocking attenuation (selectivity) function of the VLR

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