# Re: Multipath Fading

**URL:** <https://www.ruby-forum.com/t/re-multipath-fading/241872>\
**Category:** GNU Radio\
**Created:** [May 7, 2015, 10:43am UTC](https://www.ruby-forum.com/t/re-multipath-fading/241872 "2015-05-07T10:43:58Z")\
**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:** [May 7, 2015, 10:43am UTC](https://www.ruby-forum.com/t/re-multipath-fading/241872/1 "2015-05-07T10:43:58Z")

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---------- Forwarded message ----------  
From: Ritvik P. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
Date: Fri, May 1, 2015 at 9:59 AM  
Subject: Re: [Discuss-gnuradio] Multipath Fading  
To: Mostafa A. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)

Hey,  
I tried applying multipath fading in Gnu radio.  
But as a result there is increment in the signal power which is excatly  
the  
opposite of the theory.  
kindly find the attachments for the images.

On Sat, Apr 25, 2015 at 10:28 PM, Ritvik P.  
[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)

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**Author:** ![Ritvik\_P](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/df705f/32.png) [@Ritvik\_P](https://www.ruby-forum.com/u/Ritvik_P)\
**Post date:** [May 7, 2015, 11:42am UTC](https://www.ruby-forum.com/t/re-multipath-fading/241872/2 "2015-05-07T11:42:59Z")

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Hello Ritvik,

I have a few questions, could you find a quick answer to each of them,  
so that I understand the situation better?

I’m very confused, because you have a screenshot of a Flowgraph that has  
multiple QT GUI sinks, but is set to WX. And then you have a screenshot  
of QT Gui visualizations and also one of WX GUI visualizations.

Would you mind explaining these graphs a bit better? In which file do  
you show what?

Why are you using real-world measured signal from a USRP source to test  
the fading simulator in GNU Radio? Why not simply use a noise source?

> But as a result there is increment in the signal power which is excatly  
> the opposite of the theory.  
> What is it that you were expecting?

Thanks,  
Marcus