Hi, I'm currently working on USRP sensitivity and noise. Noise power depends on receiver bandwidth ( https://en.wikipedia.org/wiki/Johnson%E2%80%93Nyquist_noise#Noise_power_in_decibels). But what if : - I sample a signal at 4MHz with USRP + GNURadio (Thermal noise power = -174 + 10*log(4MHz) ) - I add a decimation by 10 in GNURadio What is the new thermal noise power ? The same, or -174 + 10*log(400kHz) ? I've made some tests with USRP + GNURadio, and the noise seems to be lower after decimation, but not of 20 dB (more of 10 dB).
Thanks for your help,
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