# Regarding OFDM demodulation

**URL:** <https://www.ruby-forum.com/t/regarding-ofdm-demodulation/234523>\
**Category:** GNU Radio\
**Created:** [March 11, 2015, 7:37am UTC](https://www.ruby-forum.com/t/regarding-ofdm-demodulation/234523 "2015-03-11T07:37:23Z")\
**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 11, 2015, 7:37am UTC](https://www.ruby-forum.com/t/regarding-ofdm-demodulation/234523/1 "2015-03-11T07:37:23Z")

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Hello sir,  
I connect OFDM simple block diagram as shown below.I got OFDM  
Modulated  
output but unable to get OFDM Demodulated output.Will you please suggest  
me  
any solution for this.  
Thank you Sir.

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**Author:** ![casper\_the\_ghost](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/58956e/32.png) [@casper\_the\_ghost](https://www.ruby-forum.com/u/casper_the_ghost)\
**Post date:** [March 11, 2015, 8:41am UTC](https://www.ruby-forum.com/t/regarding-ofdm-demodulation/234523/2 "2015-03-11T08:41:45Z")

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Dear Gaddam,

I think your symbol generation is a bit weird.  
I think you want to send binary data, but you convert that to float  
before passing it to OFDM mod. I’m pretty sure that’s not what you  
really want to do – just set the input type in the OFDM mod block to  
byte, short or int, and generate random numbers between 0 and 2^8, 2^16  
or 2^32, respectively, using the corresponding output type of your  
random source.

Anyway, you’re not giving nearly enough information to help you – “not  
getting demodulated output” doesn’t really indicate what goes wrong. Try  
the recommendations in [1], to give us a more meaningful description of  
the problem.

Best regards,  
Marcus M?ller

[1] [http://gnuradio.org/redmine/projects/gnuradio/wiki/ReportingErrors](http://gnuradio.org/redmine/projects/gnuradio/wiki/ReportingErrors)

PS:

> Hello sir,

There’s not only “sirs” on this list, but also “ladies”, and maybe a few  
artificial intelligences, so maybe just say hello 😉