Re: [Discuss-gnuradio] Help - Tutorial: PSK Symbol Recovery

[Marcus Müller]

Hi Jose,

so, the flow graphs in the tutorial do timing and frequency
synchronization, but what they don't do is any kind of framing: you just
won't know if the first bit you decoded is a the first bit of a byte, or
from somewhere in the middle; that's what you're seeing here, probably!

Best regards,

Marcus

On 28.05.2016 19:42, Jose Perez wrote:
> Hi all,
>
> I am studying the tutorial 7: PSK Symbol Recovery. For it, I am using the
> mpsk_stage6.grc example flowgraph.
> But I am trying to simulate a transmition of a txt file. I can see the
> decoded signal on the scope perfectly but I would like to save this received
> file.
> According the tutorial, after diferential decoder it have a Map block that
> maps the original symbols from 0-3, so unpack those 2 bits per symbol into
> bits using the unpack bits block... and then  we have the original bit
> stream of data. 
> To save the received txt file, I am using the repack bits block after the
> unpack bits block, i.e., after the Unpack 2 bits I use the Pack 8 bits and
> File Sink block... but the outputed file shows wrong  character.
>
> I don't know why it is wrong.... it should works fine
> Someone could help me with it? It looks be a simple thing to do but I can
> not see what to do.
>
> Thanks
>
>
>
> --
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