# MIMO Error on USRP2 2X

**URL:** <https://www.ruby-forum.com/t/mimo-error-on-usrp2-2x/222433>\
**Category:** GNU Radio\
**Created:** [August 28, 2012, 4:04pm UTC](https://www.ruby-forum.com/t/mimo-error-on-usrp2-2x/222433 "2012-08-28T16:04:26Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![aris](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/258eb7/32.png) [@aris](https://www.ruby-forum.com/u/aris)\
**Post date:** [August 28, 2012, 4:04pm UTC](https://www.ruby-forum.com/t/mimo-error-on-usrp2-2x/222433/1 "2012-08-28T16:04:26Z")

</div>

i want to make MIMO on 2X USRP2 GRC is attached, i got this error…

linux; GNU C++ version 4.6.3; Boost\_104601; UHD\_003.004.002-34-stable

– Opening a USRP2/N-Series device…  
– Current recv frame size: 1472 bytes  
– Current send frame size: 1472 bytes  
Using Volk machine: sse4\_2\_32  
Floating point exception (core dumped)

Regards  
Muhammad Junaid  
removed\_email\_address@domain.invalid

> **[Muhammad Junaid](https://junaidmuhammad.webs.com/)**
>
> http://www.linkedin.com/profile/edit?trk=hb\_tab\_pro\_top
> https://www.facebook.com/jnuaid124
> https://sites.google.com/site/juneid124/
> m\_junaid0124@yahoo.com

---

<div class="post-metadata">

**Author:** ![Muhammad\_JUNAID](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/8dc957/32.png) [@Muhammad\_JUNAID](https://www.ruby-forum.com/u/Muhammad_JUNAID)\
**Post date:** [August 28, 2012, 7:20pm UTC](https://www.ruby-forum.com/t/mimo-error-on-usrp2-2x/222433/2 "2012-08-28T19:20:56Z")

</div>

On 08/28/2012 07:02 AM, Muhammad JUNAID wrote:

> i want to make MIMO on 2X USRP2 GRC is attached, i got this error…
> 
> linux; GNU C++ version 4.6.3; Boost\_104601; UHD\_003.004.002-34-stable
> 
> – Opening a USRP2/N-Series device…  
> – Current recv frame size: 1472 bytes  
> – Current send frame size: 1472 bytes  
> Using Volk machine: sse4\_2\_32  
> Floating point exception (core dumped)

I am unsure, but I have 2 suggestions.

1. You dont need the throttle block. The USRP sink throttles the stream.

2. You should individually address the USRPs to avoid confusion over  
which “block” is which device:  
[http://files.ettus.com/uhd\_docs/manual/html/identification.html](http://files.ettus.com/uhd_docs/manual/html/identification.html)

Try making those fixes. If there error is still present, I recommend  
sending a gdb traceback so we can know where the issue occurred.

-josh