# Full-duplex

**URL:** <https://www.ruby-forum.com/t/full-duplex/239980>\
**Category:** GNU Radio\
**Created:** [March 22, 2014, 8:26pm UTC](https://www.ruby-forum.com/t/full-duplex/239980 "2014-03-22T20:26:16Z")\
**Posts on this page:** 5\
**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:** [March 22, 2014, 8:26pm UTC](https://www.ruby-forum.com/t/full-duplex/239980/1 "2014-03-22T20:26:16Z")

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I want to use 2 Laptops with GNU Radio installed & 2 USRPs , but I want  
a  
full duplex OFDM link so each USRP will work as a TX & RX .  
How to do a Full-duplex traffic ?  
will I need to make a new block on GNU Radio to be used as a  
transceiver ?  
Thanks 🙂

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**Author:** ![Sara\_ChSSrif](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/7ba0ec/32.png) [@Sara\_ChSSrif](https://www.ruby-forum.com/u/Sara_ChSSrif)\
**Post date:** [March 22, 2014, 9:03pm UTC](https://www.ruby-forum.com/t/full-duplex/239980/2 "2014-03-22T21:03:03Z")

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Hi sara,  
which USRPS do you have?

–  
View this message in context:  
[http://gnuradio.4.n7.nabble.com/Full-duplex-tp47137p47138.html](http://gnuradio.4.n7.nabble.com/Full-duplex-tp47137p47138.html)  
Sent from the GnuRadio mailing list archive at [Nabble.com](http://Nabble.com).

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**Author:** ![Sara\_ChSSrif](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/7ba0ec/32.png) [@Sara\_ChSSrif](https://www.ruby-forum.com/u/Sara_ChSSrif)\
**Post date:** [March 22, 2014, 9:17pm UTC](https://www.ruby-forum.com/t/full-duplex/239980/3 "2014-03-22T21:17:39Z")

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I have one USRP B100 & the other USRP is B200

2014-03-22 22:01 GMT+02:00 zielalaoui [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):

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**Author:** ![Sara\_ChSSrif](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/7ba0ec/32.png) [@Sara\_ChSSrif](https://www.ruby-forum.com/u/Sara_ChSSrif)\
**Post date:** [March 22, 2014, 9:25pm UTC](https://www.ruby-forum.com/t/full-duplex/239980/4 "2014-03-22T21:25:50Z")

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The used USRPs don’t actually matter much; you can have UHD source &  
sink in the same flow graph, so to combine the OFDM Rx&Tx.

A word of advise, though: Start off with having a working OFDM one-way  
communication, that is, for starters in GNU Radio, a milestone by  
itself. Then combine the two functionalities in one flow graph.

Examples of OFDM Tx and Rx flow graphs are in the GNU Radio source  
tree under gnuradio/gr-digital/examples/ofdm .

Greetings,  
Marcus

On 22.03.2014 21:16, Sara C. wrote:

> > [http://gnuradio.4.n7.nabble.com/Full-duplex-tp47137p47138.html](http://gnuradio.4.n7.nabble.com/Full-duplex-tp47137p47138.html)  
> > mailing list [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
> > [Discuss-gnuradio Info Page](https://lists.gnu.org/mailman/listinfo/discuss-gnuradio)

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**Author:** ![Sara\_ChSSrif](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/7ba0ec/32.png) [@Sara\_ChSSrif](https://www.ruby-forum.com/u/Sara_ChSSrif)\
**Post date:** [March 23, 2014, 6:47pm UTC](https://www.ruby-forum.com/t/full-duplex/239980/5 "2014-03-23T18:47:51Z")

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On 03/22/2014 09:16 PM, Sara C. wrote:

> I have one USRP B100 & the other USRP is B200

True full-duplex (i.e. tx & rx at the same time) will not work w/ these,  
half-duplex will work.

Martin