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

[Brian Padalino]

On Dec 13, 2007 5:07 PM, George Nychis <address@hidden> wrote:
> Well, that definitely explains things and why my GMSK receiver can't
> decode a transmission ;)
>
> I just called Leo, he's on his way back to China for the break until
> mid-January.  This is something I don't want to wait on, so I'm going to
> try and tackle it myself.
>
> His suggestion was to make the megacell 32-bits wide, and on the RX
> strobe (what we're using to signal a write), write 16 bits from the
> first channel and then 16 bits from the second channel to it.

Looking at the flow, each channel has a fifo1kx16 each, which you are
presumably going to make a fifo512x32?

I have a feeling you're going to have to modify your packet_builder as
well.  The packet_builder looks at the channel FIFOs sequentially and
builds a packet based on that FIFO.  You need to add a state or some
extra logic in the FORWARD state that will FORWARD_I then FORWARD_Q
from the input chan_fifodata.

That seems to be the only place where it's used, so if you make your
interface 32 bits instead of 16, and make the change to the FSM, you
should be interleaving happily.

Good luck with your modification.

Brian