On Mon, Jul 7, 2014 at 4:08 PM, Manu T S <[email protected]> wrote:
> Dear All,
>
> I am constructing the flow graph(screen capture, grc) attached.
>
> I am expecting the data at the output of packed-to-unpacked block to be
> the same as the data at the output of differential decoder, except for some
> stray bits in the beginning. When I search for patterns in the transmit
> chain, in the receive chain, I don't get any match. This it the code(also
> attached) that I use to compare data in the transmit chain and the receive
> chain.
> ======================
> import scipy
>
> template_len = 20
>
> temp = scipy.fromfile(open("/tmp/diff-encode-out.bin"),
> dtype=scipy.uint8, count=1000)
> template = temp[100:template_len+100]
> print len(template)
> match = False
> rec = scipy.fromfile(open("/tmp/rec-map-out.bin"), dtype=scipy.uint8,
> count=100000)
> for i in range(9950):
> if (template == rec[i:template_len+i]).all():
> print i
> break
> ===========================
>
> The program works for BPSK, but fails to find pattern in QPSK, DQPSK etc.
> Would anyone know what is going wrong in my flow-graph?
>
> Thank you in advance.
> --
> Manu T S
>
Hi Manu,
This generally looks correct, but you'll want to see about that map block
(or the constellation pre-diff coding) to translate the symbols->bits
correctly. And if you think you've done it right, try again :)
Tom
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