Hi all,
For the in-band code, I'm noticing that it seems like the FPGA is
packing two I's or two Q's, and not an I and a Q. If you take a look at
the following plot of a 10MHz sine wave, you will see what I mean. The
left plot is using the legacy receiver, the right side is using an
in-band receiver:
http://www.andrew.cmu.edu/user/gnychis/sines.png
This boils down to the following code:
http://gnuradio.org/trac/browser/gnuradio/branches/features/inband-usb/usrp/fpga/inband_lib/rx_buffer_inband.v
I'm guessing that Thibaud's original assumption was that I and Q are
packed in a single channel to be read from. With a single data channel,
the code will only read from channel 0. Is this incorrect? If so, this
explains the behavior we're seeing.
If I and Q are on separate channels, are they synchronized?
- George
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