I have some doubt in understanding working principle of usrp. I just
to confirm my understanding:
I have AM modulated singnal x(t)cos(2pifc*t) and i am receiving
signal in antenna.
In Daughter board, this signal is multiplied by cos(2pifct) and
sin(2pifct) in two separate branches (assuming Direct conversion –
Branch 1: x(t)cos(2pifct) * cos(2pifct) --> LPF --> x(t) -->
Branch 2: x(t)cos(2pifct) * sin(2pifct) --> LPF --> 0 (since
and sin are orthogonal) --> FPGA
Since Daughter board is doing direct conversion, no mixing in FPGA
In PC, I will have I component as x(t) and Q component as 0 for AM
Is my understanding correct?
Similarly if I take OFDM modulated signal – xr(t)cos(2pifct) -
xi(t)sin(2pifct) – output at Daughter board will be xr(t) at I
component and xi(t) at Q component. This will be send to PC. Is it