Re: [Discuss-gnuradio] Chunks to symbols with 16 QAM modulation

[Cinaed Simson]

On 07/17/2017 01:29 AM, Rafik ZITOUNI wrote:
> Dear Cinaed, 
> 
> The costas loop works only with BPSK, QPSK and 8PSK. 

I forgot about that.

You can certainly see the constellation by tapping the output of the
polyphase clock. If it looks messy try reducing the output sps of
polyphase clock to 1.
> 
> Is it possible to change the actual costas loop and add the 16 QAM. 

It might be easier to use 16PSK.

-- Cinaed

> 
> Best regards, 
> 
> 
> 
> 2017-07-14 0:46 GMT+02:00 Cinaed Simson <address@hidden
> <mailto:address@hidden>>:
> 
>     On 07/13/2017 06:16 AM, Rafik ZITOUNI wrote:
>     > Dear Cinaed,
>     >
>     > But how to see the constellations of my received symbols since
>     > constellation receiver and constellation decoder have a byte as an 
> output.
>     >
>     > Is it possible to have a costas loop for QAM 16?
> 
>     I use the Polyphase Clock Sync.
> 
>     In the tutorial 7, they use a channel model
> 
>      Const. Demod -> Channel Model-> Polyphase Clock -> CMA Equalizer ->
>     Costa Loop -> Demodulator
> 
>     and put the Constellation Sink on the output of the Costa Loop.
> 
>     -- Cinaed
> 
>     >
>     > Thanks,
>     >
>     > 2017-07-13 1:30 GMT+02:00 Cinaed Simson <address@hidden 
> <mailto:address@hidden>
>     > <mailto:address@hidden <mailto:address@hidden>>>:
>     >
>     >     On 07/12/2017 09:55 AM, Rafik ZITOUNI wrote:
>     >     > Dear Cinaed,
>     >     >
>     >     > Thanks for your answer.
>     >     >
>     >     > I tried with my Tx and it works fine with a constellation, but 
> with my
>     >     > receiver symbols or  constellation_decoder, digital.qam_16()[1] 
> gives me
>     >     > an error.
>     >
>     >     I'm using the Constellation Modulator/Constellation Decoder pair 
> and the
>     >     Constellation Object with Type=Variable Constellation.
>     >
>     >     The same object is used for both the Constellation Modulator and the
>     >     Constellation Decoder.
>     >
>     >     When I look inside the Constellation Decoder there's nothing to
>     >     configure.
>     >
>     >     Maybe you're doing things differently.
>     >
>     >     -- Cinaed
>     >
>     >     >
>     >     > line 164, in __init__
>     >     >     self.digital_constellation_decoder_cb_0_0 =
>     >     > digital.constellation_decoder_cb(digital.qam_16()[1])
>     >     >
>     >     > Best,
>     >     >
>     >     >
>     >     >
>     >     >
>     >     > 2017-07-12 2:26 GMT+02:00 Cinaed Simson <address@hidden 
> <mailto:address@hidden>
>     <mailto:address@hidden <mailto:address@hidden>>
>     >     > <mailto:address@hidden
>     <mailto:address@hidden> <mailto:address@hidden
>     <mailto:address@hidden>>>>:
>     >     >
>     >     >     On 07/11/2017 05:13 AM, Rafik ZITOUNI wrote:
>     >     >     > Dear gnuradio users,
>     >     >     >
>     >     >     > I am trying to use digital_chunks_to_symbols to reconstruct 
> block by
>     >     >     > block my QAM modulator.
>     >     >     >
>     >     >     > Please could you give me an idea how to set the 
> constellation points in
>     >     >     > Symbol Table field?  I can do it with BPSK, QPSK and 8PSK 
> using
>     >     >     > constellation[0].points, constellation[1].points and
>     >     >     > constellation[2].points, but how can I do it with 16 QAM ?
>     >     >
>     >     >     Try
>     >     >
>     >     >      Symbols:        digital.qam_16()[1]
>     >     >      Constellations: digital.qam_16()[0]
>     >     >
>     >     >     -- Cinaed
>     >     >
>     >     >
>     >     >     >
>     >     >     > For my 16 QAM receiver, could you please tell me if it's 
> possible to
>     >     >     > have a constellation points view?
>     >     >     >
>     >     >     > Best,
>     >     >     >
>     >     >     > --
>     >     >     > **<http://www.ece.fr/>Rafik
>     >     >     >
>     >     >     >
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>     >     > --
>     >     > **<http://www.ece.fr/>Rafik
>     >     >
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> 
> 
> -- 
> **<http://www.ece.fr/>Rafik
>