# Eb/N0 Ofdm

**URL:** <https://www.ruby-forum.com/t/eb-n0-ofdm/242843>\
**Category:** GNU Radio\
**Created:** [August 1, 2015, 8:19pm UTC](https://www.ruby-forum.com/t/eb-n0-ofdm/242843 "2015-08-01T20:19:49Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Sadaf\_N](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/858c86/32.png) [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\
**Post date:** [August 1, 2015, 8:19pm UTC](https://www.ruby-forum.com/t/eb-n0-ofdm/242843/1 "2015-08-01T20:19:49Z")

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Hello

I’m simulating an OFDM scheme with channel coding and digital modulation  
(16  
QAM).  
I would like to calculate BER values with an “Error Rate” block while I  
vary  
the amplitude of the noise voltage, using for this, a slider to vary the  
Eb/N0.

My question is: What expression (or equation) should I use on the noise  
voltage so it depends on the Eb/N0?

Than you.  
Marbellys

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