# Spectrum sensing Simulation Only **URL:** \ **Category:** GNU Radio\ **Created:** [July 29, 2014, 9:58pm UTC](https://www.ruby-forum.com/t/spectrum-sensing-simulation-only/231242 "2014-07-29T21:58:43Z")\ **Posts on this page:** 4\ **Page:** 1
**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:** [July 29, 2014, 9:58pm UTC](https://www.ruby-forum.com/t/spectrum-sensing-simulation-only/231242/1 "2014-07-29T21:58:43Z")
Hello Everyone I am a new to gnuradio. I would like to do simulation of spectrum sensing (Simple energy detector with single band only). Normally I have seen “usrp\_spectrum\_sense.py”. However, that is written for USRP (and not easy to understand and modify it). Actually I have a difficulty in computing average and display it continuously in a graphical user interface. See also my grc and corresponding python code (The vector sinc block is not correct). Any help is appreciated. ## Thanks, Tadilo Endeshaw, PhD Postdoctoral Researcher Institut National de recherche Scientifique Centre Energie Matriaux Telecommunications Place Bonaventure, 800 de la Gauchetiere Ouest, Suite 6900 H5A 1K6 Montreal, QC Canada E-mail : removed\_email\_address@domain.invalid removed\_email\_address@domain.invalid (private) Personal home page: [https://sites.google.com/site/tadilomypage/](https://sites.google.com/site/tadilomypage/) ---
**Author:** ![BogaleS\_Tadilo\_Ende](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/85e7bf/32.png) [@BogaleS\_Tadilo\_Ende](https://www.ruby-forum.com/u/BogaleS_Tadilo_Ende)\ **Post date:** [July 30, 2014, 3:43pm UTC](https://www.ruby-forum.com/t/spectrum-sensing-simulation-only/231242/2 "2014-07-30T15:43:41Z")
On Tue, Jul 29, 2014 at 3:34 PM, Bogale, Tadilo Endeshaw \< [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)\> wrote: > See also my grc and corresponding python code (The vector sinc block is > not correct). > > Any help is appreciated. > > ## Thanks, > > Tadilo Endeshaw, PhD The easiest way to average is to use the single\_pole\_iir\_filter to smooth out the data stream. But note that you’re coming out of the FFT block as a vector. You can set the vector length of the single pole IIR, but I’d have to review exactly what that means mathematically. It probably smooths the entire vector as one as opposed to smoothing over index i in each vector. You might have to play around with that. Tom ---
**Author:** ![BogaleS\_Tadilo\_Ende](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/85e7bf/32.png) [@BogaleS\_Tadilo\_Ende](https://www.ruby-forum.com/u/BogaleS_Tadilo_Ende)\ **Post date:** [July 30, 2014, 4:03pm UTC](https://www.ruby-forum.com/t/spectrum-sensing-simulation-only/231242/3 "2014-07-30T16:03:54Z")
On 07/30/2014 03:37 PM, Tom R. wrote: > The easiest way to average is to use the single\_pole\_iir\_filter to > smooth out the data stream. But note that you’re coming out of the FFT > block as a vector. You can set the vector length of the single pole IIR, > but I’d have to review exactly what that means mathematically. It > probably smooths the entire vector as one as opposed to smoothing over > index i in each vector. You might have to play around with that. gr-specest might help you with that (pybombs install gr-specest, or [GitHub - kit-cel/gr-specest: A module adding spectral estimation routines to GNU Radio. · GitHub](https://github.com/kit-cel/gr-specest)). M ---
**Author:** ![BogaleS\_Tadilo\_Ende](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/85e7bf/32.png) [@BogaleS\_Tadilo\_Ende](https://www.ruby-forum.com/u/BogaleS_Tadilo_Ende)\ **Post date:** [July 31, 2014, 3:01pm UTC](https://www.ruby-forum.com/t/spectrum-sensing-simulation-only/231242/4 "2014-07-31T15:01:06Z")
Tadilo, please stick to the mailing list. On 07/30/2014 08:23 PM, Bogale, Tadilo Endeshaw wrote: > Hello Martin > > Thank you for the help. I try to run “specest\_noisy\_sinusoid\_mtm.py” (Python > script is also okey for me). However it does not run “it says no module specest”. Did you install gr-specest? > My goal is is to write a simple python or gnuradio code to perform the following > task That’s really simple. In gr-specest, the “Welch” blocks pretty much do that. Even without, you can easily click that together in GRC. M