Re: [Discuss-gnuradio] How to get constellation after demodulation

[Ben Reynwar]

Take a look at gr-digital/python/generic_mod_demod.py for an example
of the kind of signal-processing blocks that you'll need.

On Fri, Mar 22, 2013 at 10:30 AM, Azza Ben Mosbah
<address@hidden> wrote:
> In fact, this is the receiver I make. But, I can't find the right
> constellation. That's why I think I have a problem in blocks I have already
> implemented.
>
>
>
> On Fri, Mar 22, 2013 at 5:37 PM, Ben Reynwar <address@hidden> wrote:
>>
>> I'm assuming you want to visualize the symbols after synchronization
>> but before decision making.  At the moment this is a pain, because the
>> fine phase adjustment and the decision making are performed in the
>> same block (constellation_receiver).  What you want is the fourth
>> optional output of the constellation_receiver block.  Unfortunately
>> this output is not available in any of the hierarchical demodulation
>> blocks (because hierarchical blocks can't have optional outputs yet).
>> This means that if you want to do it in grc you won't be able to use
>> one of the straightforward demodulation blocks, rather you'll have to
>> put all the synchronization blocks in there independently.
>>
>> When I want to do this, I do it in python, and hackishly connect
>> directly to the 'constellation_receiver' block that is inside the
>> demodulation block.
>>
>> i.e. tb.connect( (my_demodulation_block.receiver, 4),
>> my_visualization_block)
>>
>> Ben
>>
>> On Fri, Mar 22, 2013 at 2:53 AM, Azza Ben Mosbah
>> <address@hidden> wrote:
>> > Hello,
>> >
>> > I receive data from USRP and demodulate them, then I can have the
>> > constellation. But, I can't find a way to join blocks, so they can show
>> > a
>> > result. I need some help concerning the scheme I have to implement to
>> > get my
>> > constellation.
>> > Thanks in advance.
>> >
>> > Best Regards,
>> > Azza.
>> >
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>> >
>
>