# Any friend working on Hydra from UT austin? How about the performance

**URL:** <https://www.ruby-forum.com/t/any-friend-working-on-hydra-from-ut-austin-how-about-the-performance/219978>\
**Category:** GNU Radio\
**Created:** [May 23, 2012, 6:50pm UTC](https://www.ruby-forum.com/t/any-friend-working-on-hydra-from-ut-austin-how-about-the-performance/219978 "2012-05-23T18:50:22Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![dubstep](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/cdc98d/32.png) [@dubstep](https://www.ruby-forum.com/u/dubstep)\
**Post date:** [May 23, 2012, 6:50pm UTC](https://www.ruby-forum.com/t/any-friend-working-on-hydra-from-ut-austin-how-about-the-performance/219978/1 "2012-05-23T18:50:22Z")

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Hi,

Considering the GNURadio provided OFDM implementaiton is not so robust,  
and  
my test shows its limited performance (supporting bandwidth, packet loss  
rate, etc.), I would like to port the hydra to USRP2. Hydra claims that  
they support up to 5.4Mbps for SISO OFDM. But I am not sure anyone has  
verified it in your platform? I am concerned with the computing  
capability  
of the host-pc. Can it really support so high data rate running the  
hydra+GNURadio. My computer is i7 4Core @3.4GHz.

–

Alex,  
_Dreams can come true just believe._

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**Author:** ![akeem](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/54ee81/32.png) [@akeem](https://www.ruby-forum.com/u/akeem)\
**Post date:** [May 24, 2012, 12:30am UTC](https://www.ruby-forum.com/t/any-friend-working-on-hydra-from-ut-austin-how-about-the-performance/219978/2 "2012-05-24T00:30:39Z")

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I would assume GNUradio’s OFDM is mathematically identical to Hydra,  
have you tired finding what settings ( Channel spacing, FFT size,  
Number of sub-carriers, Sub-carrier modulation scheme, symbol length,  
guard interval, Sub-carrier spacing, and FEC ) hydra uses and setting  
GnuRadio to that. It should yield identical throughput.

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**Author:** ![akeem](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/54ee81/32.png) [@akeem](https://www.ruby-forum.com/u/akeem)\
**Post date:** [May 24, 2012, 2:56am UTC](https://www.ruby-forum.com/t/any-friend-working-on-hydra-from-ut-austin-how-about-the-performance/219978/3 "2012-05-24T02:56:04Z")

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I only have one USRP, and I believe only like 2% of people here have  
more than one for that kind of testing, so there’s not many here with  
answers in this case. I saw you last thread and felt bad no one knew  
the answer. Although I believe the answer could be derived from the  
available bandwidth and noise.

---

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**Author:** ![akeem](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/54ee81/32.png) [@akeem](https://www.ruby-forum.com/u/akeem)\
**Post date:** [May 24, 2012, 2:04am UTC](https://www.ruby-forum.com/t/any-friend-working-on-hydra-from-ut-austin-how-about-the-performance/219978/4 "2012-05-24T02:04:10Z")

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Thanks Andrew, i will try to manually adjust these parameters to find  
the  
optimized performance.  
But before that, I really want to know any existing benchmark on  
the performance over this GNURadio OFDM.  
For example, on what kind of host-pc, what kind data rate have you  
reached,  
with how much packet loss rate?

On Wed, May 23, 2012 at 5:29 PM, Andrew D.  
[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)wrote:

> > Considering the GNURadio provided OFDM implementaiton is not so robust,

–

Alex,  
_Dreams can come true just believe._