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Sylvain Munaut 246tnt at gmail.comHi, > Its about far-near problem (05.05 p.5.1), i.e. blocking by near mobile with > high signal at only 600kHz offset. > Therefore, calculated that LO noise at 600kHz offset should be around > -140dBc/Hz to keep nominal Rx sencitivity for wanted far mobile. Mmm, interesting, I had never thought about this. Can you confirm my computation is the right one : Minimum Ec/No of 8 dB, thernal noise of GSM ~ -120 dBm, so the weakest mobile would be a -112 dBm. The interference I see specified in 05.05 is a -26 dBm sine, so with -140 dBc/Hz you'd get a -166 dBm 'leak' of the interference in the signal of interest at any given position, which you need to integrate over the entire useful bandwidth of the GSM signal ( 271 kHz -> 10 * log10(271e3) = 54 dB ), which would give a -112 dBm noise. Cheers, Sylvain