# Re: QAM and Chunks\_to\_Symbol

**URL:** <https://www.ruby-forum.com/t/re-qam-and-chunks-to-symbol/242600>\
**Category:** GNU Radio\
**Created:** [July 6, 2015, 3:49pm UTC](https://www.ruby-forum.com/t/re-qam-and-chunks-to-symbol/242600 "2015-07-06T15:49:05Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Detlef\_R](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/58f4c7/32.png) [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\
**Post date:** [July 6, 2015, 3:49pm UTC](https://www.ruby-forum.com/t/re-qam-and-chunks-to-symbol/242600/1 "2015-07-06T15:49:05Z")

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Every memoryless modulation scheme can be described as M vectors in an  
N-dimensional space.  
So the chunck-to-symbols requires as dimensionality parameter the N and  
then it needs this array of numbers

s11, s12, … s1N,  
s21, s22, … s2N,  
…  
SM1, sM2, … sMN

So a 2-dim orthogonal scheme is

N=2

table =

1 ,0,  
0, 1

Achilleas