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From: | George Nychis |
Subject: | Re: [Discuss-gnuradio] I&Q on same or separate channels? |
Date: | Fri, 14 Dec 2007 02:17:19 -0500 |
User-agent: | Thunderbird 2.0.0.6 (X11/20071022) |
I and Q are not on separate channels. They are interleaved, I0, Q0, I1, Q1...
Are we sure of this? Based on Brian's pointer to here: http://gnuradio.org/trac/browser/gnuradio/branches/features/inband-usb/usrp/fpga/toplevel/usrp_inband_usb/usrp_inband_usb.v#L235... it seems as though they are wired to separate channels. We then use them as inputs to rx_buffer_input here:
http://gnuradio.org/trac/browser/gnuradio/branches/features/inband-usb/usrp/fpga/toplevel/usrp_inband_usb/usrp_inband_usb.v#L260 ... but only ever read from channel 0 (I). Is there a module we are missing that interleaves them? - George
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