Re: [Discuss-gnuradio] Getting really confused by PSK mod/demod blocks

[Pierre]

Hello again,

I've tried comparing the unpacked bitstream, and it's utter nonsense :
the first half of it is only zeroes while I know none of the bytes
transfered to be null.

My guess is that there's some parameter for either the modulator,
demodulator, or both, that I haven't set correctly, but I can't seem to
find which or how to set it so that everything works properly.

Best regards,
Pierre

Le mardi 02 mai 2017 à 17:42 +0200, Marcus Müller a écrit :
> Hi Pierre, 
> 
> really odd looking data – what's that? have you tried comparing your
> unpacked bit streams? it's possible you're just missing the first few
> bits at the beginning, but if you then reassemble the bits to octets,
> you'd get wrong data.
> Best regards,
> Marcus
> 
> 
> On 05/02/2017 05:28 PM, Pierre AVITAL wrote:
> 
> > Hello,
> > 
> > I've been trying to use the PSK mod/demod, as well as DPSK
> > mod/demod, blocks to try to listen to signals using DQPSK
> > modulation.
> > But I'm completely stumped by their behavior : as can be seen in
> > the attachement here, I've tried to simulate my demodulation by
> > having a byte-stream sent through either DPSK or GFSK modulation,
> > then demodulating it and repacking it before sending it to a block
> > I coded that just prints what's on input and signals whether or not
> > it could spot a sync word.
> > 
> > This works fine with GFSK, where the output of my "Test Block" is
> > the same as what the file contains.
> > But with DPSK, I get really odd looking data. Is there something
> > I'm missing here ? I've been trying various repackings both before
> > and after mod/demoding the signal, and have yet to figure out how
> > to get my data demodulated (or even modulated) properly with the
> > PSK blocks. 
> > 
> > Thanks in advance for any help you could provide.
> > 
> > 
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