Forum: GNU Radio USRP TX/RX - IQ vs Real Sampling

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dan s (Guest)
on 2008-12-15 23:15
(Received via mailing list)
Hi,
 
I'm using the USRP and LFRX and LFTX daughtercards for an underwater
acoustics project. 
 
I am confused on how the IQ (complex) and real sampling works with the
USRP (I read a couple of papers and im still lost).  If I wish to use
real sampling and I install two LFRX and two LFTX boards can I
effectively have 4 simultaneous transmitters and 4 simultaneous
receivers (I'm aware of the 16Mhz bandwidth limitation due to USB
transfer data rate)? 
 
I know the usrp_rx_cfile.py script saves data in complex form.  For this
particular python script and an LFRX board, would the RX-A input
correspond to the I portion, and RX-B input to the Q portion?
 
I'm still not sure what advantages there would be for using IQ sampling
for my particular application (I'm only interested in frequencies from
DC to 150 kHz). Does anyone know?
 
Thanks,
Dan
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