# OFDM benchmarking with UHD

**URL:** <https://www.ruby-forum.com/t/ofdm-benchmarking-with-uhd/240629>\
**Category:** GNU Radio\
**Created:** [April 23, 2014, 9:02pm UTC](https://www.ruby-forum.com/t/ofdm-benchmarking-with-uhd/240629 "2014-04-23T21:02:32Z")\
**Posts on this page:** 2\
**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:** [April 23, 2014, 9:02pm UTC](https://www.ruby-forum.com/t/ofdm-benchmarking-with-uhd/240629/1 "2014-04-23T21:02:32Z")

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Hi all,

(Ubuntu 1304 gnuradio 3.7)

I want to test OFDM in gr\_digital using tx\_ofdm.grc and rx\_ofdm.grc.  
(simultaneously using usrp n200 devices)  
Where are UHD source and sink in that flow g.?

Since I do not want to add them myself, I want to see how the original  
system works.  
Do you know where I can find such a thing?

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**Author:** ![nesazeri](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/e19adc/32.png) [@nesazeri](https://www.ruby-forum.com/u/nesazeri)\
**Post date:** [April 23, 2014, 9:23pm UTC](https://www.ruby-forum.com/t/ofdm-benchmarking-with-uhd/240629/2 "2014-04-23T21:23:11Z")

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Hi Nasi,

these Flow Graphs are simulation graphs; there is no hardware  
sinks/source in there, obviously.  
But you can easily make these flow graphs real hardware transmission  
flow graphs.  
You see the channel model/throttle block? That’s where reality would  
happen. Replace that and everything before with a USRP source (in the  
rx flowgraph). In the tx flowgraph, remove the throttle and following  
blocks and place a USRP sink there.

Greetings,  
Marcus

On 23.04.2014 21:01, Nasi wrote:

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