Of course that is true. I just wanted to make sure my understanding of the whole signal flow in GNU Radio/USRP system was right. The IF, down coversion etc stages confused me a bit. I was only interested in what I am getting on the USB bus to work with so, I wanted to make sure my understanding of this system was right.
Thanks for the reply. On Sun, May 29, 2011 at 4:11 PM, Marcus D. Leech <[email protected]> wrote: > On 05/29/2011 04:50 PM, John Andrews wrote: > >> Hi All, >> I want to know what is the signal coming from the USRP onto the USB bus. I >> know that the received signal is a baseband signal and assuming complex >> sampling (I have RFX2400 daughterboards) each complex sample that enters the >> USB bus is the following, >> >> x[i] = (inphase_component) + j (quadrature_component), and >> x[i] = m(t)cos( 2*pi*FREQ_OFFSET*t + PHI ) + jm(t)sin( 2*pi*FREQ_OFFSET*t >> + PHI ), where m(t), is the actual message signal, FREQ_OFFSET is the >> frequency offset, and PHI is the phase. >> >> Is that correct? >> >> Thanks >> >> >> More or less, yes. > > There will be random noise components as well, since this is "real world", > rather than purely a Matlab simulation :-) > > > > -- > Marcus Leech > Principal Investigator > Shirleys Bay Radio Astronomy Consortium > http://www.sbrac.org > > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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