# State of the art research

**URL:** <https://www.ruby-forum.com/t/state-of-the-art-research/240013>\
**Category:** GNU Radio\
**Created:** [March 24, 2014, 5:54pm UTC](https://www.ruby-forum.com/t/state-of-the-art-research/240013 "2014-03-24T17:54:54Z")\
**Posts on this page:** 2\
**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 24, 2014, 5:54pm UTC](https://www.ruby-forum.com/t/state-of-the-art-research/240013/1 "2014-03-24T17:54:54Z")

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Hello all

I have been trying to discover what is currently available in terms of  
open  
source, working out-of-the box, modules implemented in GNU Radio and the  
USRP, to use as a teaching aid with students.

I am interested in a few things, waveform generation, protocol stacks  
and  
signal analysis.

My questions:

1. Are there working examples for producing 3G, UMTS, LTE, WiMAX signals  
etc.? Are there implementations including MAC layer support?

2. Are there any implementations of a ‘test vector analyser’?

3. What is available in terms of complete protocol stacks? I understand  
there is openBTS, though I read somewhere it is not yet compatible with  
the  
current version of GNU Radio. Is this true? What about openLTE?

4. Is there a repository for such projects that are updated that I have  
not  
come across yet?

I have yet to find any real solid leads in my research for solutions.  
There  
are vague references to such projects, or papers and examples circa  
2009-11  
that I think are now depreciated in terms of GNUradio 3.7 compatibility.

Any info/pointers would be greatly appreciated.

Regards,  
Alexander Buckley

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**Author:** ![Alexander\_Buckley](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/e9a140/32.png) [@Alexander\_Buckley](https://www.ruby-forum.com/u/Alexander_Buckley)\
**Post date:** [March 25, 2014, 1:03am UTC](https://www.ruby-forum.com/t/state-of-the-art-research/240013/2 "2014-03-25T01:03:43Z")

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Hi Alexander,

I’ll try to give you some answers.

> 1. Are there working examples for producing 3G, UMTS, LTE, WiMAX  
> signals etc.? Are there implementations including MAC layer  
> support?  
> gr-lte might be interesting for you, if a PHY layer implementation of  
> LTE is of interest. At least it is designed to use GR blocks and be  
> easy to see which processing steps are to be done one after another.  
> Also it is completely ported to GR 3.7.  
> Also recently there was an announcement for gr-cdma. This might be  
> interesting in terms of 3G/UMTS.

> 1. What is available in terms of complete protocol stacks? I  
> understand there is openBTS, though I read somewhere it is not yet  
> compatible with the current version of GNU Radio. Is this true?  
> What about openLTE?  
> To the best of my knowledge, openBTS and GR have diverged since then.  
> openLTE is a very interesting LTE implementation which supports GR 3.7  
> if I interpret the commit messages correctly.

happy hacking/researching  
Johannes  
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