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
<address@hidden> 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
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
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