# (no subject)

**URL:** <https://www.ruby-forum.com/t/no-subject/234603>\
**Category:** GNU Radio\
**Created:** [March 17, 2015, 8:24am UTC](https://www.ruby-forum.com/t/no-subject/234603 "2015-03-17T08:24:07Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![addis\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/c4cdca/32.png) [@addis\_a](https://www.ruby-forum.com/u/addis_a)\
**Post date:** [March 17, 2015, 8:24am UTC](https://www.ruby-forum.com/t/no-subject/234603/1 "2015-03-17T08:24:07Z")

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Hi all,  
I’m trying to get the constellation of 16QAM. How to use constellation  
receiver block for 16QAM? thanks in advance

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**Author:** ![Vishwanatha\_H\_G](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/v/f19dbf/32.png) [@Vishwanatha\_H\_G](https://www.ruby-forum.com/u/Vishwanatha_H_G)\
**Post date:** [March 17, 2015, 3:23pm UTC](https://www.ruby-forum.com/t/no-subject/234603/2 "2015-03-17T15:23:41Z")

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Dear Vishwanatha,

have a look at the constellation\_soft\_receiver.grc example, which  
usually get’s installed somewhere like  
/usr/[local/]/share/gnuradio/examples/digital .  
You’d add a constellation object, and use that in the constellation  
receiver block. Have you had a look at the documentation [1]?  
Also, an introduction into rather comprehensive digital transmission  
system is done in our guided tutorials[2], which I really recommend  
reading from first to last.

By the way: You forgot to add a subject; since it’s hard to keep track  
of emails if you don’t, I added one. For future list mails, I’d like to  
ask you to have quick look at the principles in [3]. In this case, it  
especially be interesting to know where you’ve already looked and what  
you’ve already tried, as we constantly try to improve usability as well  
as to encourage users to constructively take part in discussion and  
development: There should not necessarily be a gap between “core  
developers” that know everything and “beginner users” that can’t solve  
problems without asking.

Best regards, and happy hacking,  
Marcus

[1] [GNU Radio Manual and C++ API Reference: Main Page](http://gnuradio.org/doc/doxygen/) , search for constellation\_receiver  
[2] [https://gnuradio.org/redmine/projects/gnuradio/wiki/Guided\_Tutorials](https://gnuradio.org/redmine/projects/gnuradio/wiki/Guided_Tutorials)  
[3] [http://gnuradio.org/redmine/projects/gnuradio/wiki/ReportingErrors](http://gnuradio.org/redmine/projects/gnuradio/wiki/ReportingErrors)