Re: [Discuss-gnuradio] QAM Mod and QAM Demod block in GRC

[Ben Reynwar]

The python generic_demod.py block uses the constellation_receiver_cb
block to do both some fine-tuning of the phase and the mapping to
bits.  It can be found at:
gnuradio/gr-digital/lib/digital_constellation_receiver_cb.cc
This in turn will use the decision_maker method of the constellation
object to do the mapping which can be found in:
gnuradio/gr-digital/lib/digital_constellation.cc
What exactly are you trying to do?

On Thu, May 31, 2012 at 8:12 PM, jiajue ou <address@hidden> wrote:
> Hi Ben,
>
> What you mean is the qam blocks in gnuradio companion are implemented in
> Python only? If I want to get the complex symbols before they are demapped
> to bits, I should modify related python scripts?
> Thank you.
>
> Jia
>
> -----Original Message-----
> From: Ben Reynwar [mailto:address@hidden
> Sent: Friday, June 01, 2012 12:39 AM
> To: jiajue ou; discuss-gnuradio Discussion Group
> Subject: Re: [Discuss-gnuradio] QAM Mod and QAM Demod block in GRC
>
> These blocks are implemented in python.
> Have a look at the following two files to start off with:
>  gnuradio/gr-digital/python/qam.py
>  gnuradio/gr-digital/python/generic_mod_demod.py
>
> Ben
>
> On Wed, May 30, 2012 at 11:41 PM, jiajue ou <address@hidden>
> wrote:
>> Hi all,
>>
>>
>>
>> I'm working on an experiment which needs to modify qam modulation
>> block in gnuradio. But I cannot find the source C++ file the qam
>> blocks use. e.g., OFDM demod block uses digital_ofdm_frame_sink in
>> gnuradiobuild/gnuradio/gr-digital/lib. What about qam blocks?
>>
>> Thank you for your help!
>>
>>
>>
>> Best,
>>
>> jia
>>
>>
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>