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Re: [Discuss-gnuradio] I&Q on same or separate channels?

From: Eric Blossom
Subject: Re: [Discuss-gnuradio] I&Q on same or separate channels?
Date: Fri, 14 Dec 2007 10:19:15 -0800
User-agent: Mutt/1.5.17 (2007-11-01)

On Fri, Dec 14, 2007 at 02:17:19AM -0500, George Nychis wrote:
>> 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

Sorry George, I misunderstood which definition of "channel" you were
using.  Yes, in the legacy code they come from separate channels, but
those channels are paired and interleaved to define a "channel" as
seen by the host code.


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