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

[Rafik ZITOUNI]

Dear Cinaed, 

The costas loop works only with BPSK, QPSK and 8PSK. 

Is it possible to change the actual costas loop and add the 16 QAM. 

Best regards, 

2017-07-14 0:46 GMT+02:00 Cinaed Simson <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@hiddencom>>:
>
>     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@hiddencom>
>     > <mailto:address@hiddencom <mailto:address@hiddencom>>>:
>     >
>     >     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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--

Rafik