Hi all,
I have some doubt in understanding working principle of usrp. I just
want
to confirm my understanding:

I have AM modulated singnal x(t)cos(2pifc*t) and i am receiving
that
signal in antenna. 
In Daughter board, this signal is multiplied by cos(2pifct) and
sin(2pifct) in two separate branches (assuming Direct conversion –
Baseband conversion) 
Branch 1: x(t)cos(2pifct) * cos(2pifct) > LPF > x(t) >
FPGA 
Branch 2: x(t)cos(2pifct) * sin(2pifct) > LPF > 0 (since
cos
and sin are orthogonal) > FPGA 
Since Daughter board is doing direct conversion, no mixing in FPGA
(i.e)
in DDC. 
In PC, I will have I component as x(t) and Q component as 0 for AM
modulated signal.
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
correct?
Thanks
Senthil