# Received Signal Power

**URL:** <https://www.ruby-forum.com/t/received-signal-power/231543>\
**Category:** GNU Radio\
**Created:** [August 14, 2014, 8:45pm UTC](https://www.ruby-forum.com/t/received-signal-power/231543 "2014-08-14T20:45:16Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![addis\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/c4cdca/32.png) [@addis\_a](https://www.ruby-forum.com/u/addis_a)\
**Post date:** [August 14, 2014, 8:45pm UTC](https://www.ruby-forum.com/t/received-signal-power/231543/1 "2014-08-14T20:45:16Z")

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Hello,

I have transmitted and received signal using USRP board. I can see the  
received power spectral density by using WX GUI FFT Sink. How can I find  
the received power of a signal? I mean I don’t require power spectral  
density but I need the received signal power.

I highly appreciate your reply.

Regards  
Nashid Anjum

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**Author:** ![MdSAnjum](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/f07891/32.png) [@MdSAnjum](https://www.ruby-forum.com/u/MdSAnjum)\
**Post date:** [August 14, 2014, 8:48pm UTC](https://www.ruby-forum.com/t/received-signal-power/231543/2 "2014-08-14T20:48:51Z")

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The power of a signal over its bandwidth is computed as:

AVG(I_I+Q_Q)

Average/Decimate/SQRT to taste.

On 2014-08-14 14:44, Md. Anjum wrote:

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Links:

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**Author:** ![MdSAnjum](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/f07891/32.png) [@MdSAnjum](https://www.ruby-forum.com/u/MdSAnjum)\
**Post date:** [August 14, 2014, 10:18pm UTC](https://www.ruby-forum.com/t/received-signal-power/231543/3 "2014-08-14T22:18:14Z")

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Use complex\_to\_maq\_squared, integrate with decimate, then 10\*log() + K,  
and  
into a time sink or signal probe. K is a calibration factor in dB that  
you  
obtain by feeding your hardware with a known power level, typically a  
signal  
generator.

Lou  
KD4HSO

Md. Anjum wrote

> Nashid Anjum
> 
> * * *
> 
> Discuss-gnuradio mailing list

> Discuss-gnuradio@

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