On Thu, Dec 13, 2007 at 04:35:51PM -0500, George Nychis wrote: > 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
I and Q are not on separate channels. They are interleaved, I0, Q0, I1, Q1... _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
