# QAM modulation

**URL:** <https://www.ruby-forum.com/t/qam-modulation/238391>\
**Category:** GNU Radio\
**Created:** [January 8, 2014, 8:11am UTC](https://www.ruby-forum.com/t/qam-modulation/238391 "2014-01-08T08:11:57Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![musicdenotation](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ea666f/32.png) [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\
**Post date:** [January 8, 2014, 8:11am UTC](https://www.ruby-forum.com/t/qam-modulation/238391/1 "2014-01-08T08:11:57Z")

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Hello all,  
is it possible to design our own block of QAM from small blocks like  
filters, synchronizers, adders etc.  
regards,  
Irfan Ulllah

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**Author:** ![Irfan\_U](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/i/57b2e6/32.png) [@Irfan\_U](https://www.ruby-forum.com/u/Irfan_U)\
**Post date:** [January 8, 2014, 12:52pm UTC](https://www.ruby-forum.com/t/qam-modulation/238391/2 "2014-01-08T12:52:22Z")

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Yes, that could be possible… But why would you do that? For “simple”  
QAMs there are decoders available, and for unavailable QAMs you’d  
simply implement your own constellation class.  
Please refer to the GNU Radio API reference for further information on  
constellation mappers.

Greetings,  
Marcus

On 08.01.2014 08:10, Irfan U. wrote:

> Hello all, is it possible to design our own block of QAM from small  
> blocks like filters, synchronizers, adders etc. regards, Irfan  
> Ulllah
> 
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**Author:** ![Irfan\_U](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/i/57b2e6/32.png) [@Irfan\_U](https://www.ruby-forum.com/u/Irfan_U)\
**Post date:** [January 8, 2014, 3:29pm UTC](https://www.ruby-forum.com/t/qam-modulation/238391/3 "2014-01-08T15:29:33Z")

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On Wed, Jan 8, 2014 at 6:44 AM, Marcus M. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> Marcus  
> Indeed. This is a good place to start:

> **[GNU Radio Manual and C++ API Reference: Digital Modulation](https://www.gnuradio.org/doc/doxygen/page_digital.html)**

Tom