Re: [Discuss-gnuradio] Spectrum Sensing

[Johannes Demel]

Hi Nikita,

In order to answer your question we need more information on what you want to do exactly. gr-fosphor takes all unprocessed samples and does everything on the GPU. Calculating spectrum, graphical output etc. As far as I know there isn't a way to get the samples back from the GPU.

Cheers

Johannes

On Mon, Dec 16, 2013 at 8:12 PM, Nikita Sharakhov <address@hidden> wrote:

Hi Johannes,

 

Thanks for the answer!  I am building my own web-based GUI, so I just need a script that just writes the spectrum data to a text file or to standard command-line output.  Is that possible with gr-fosphor?  Is there any other software that I should look at?

 

Best regards,

 

Nikita

 

From: Johannes Demel [mailto:address@hidden]
Sent: Monday, December 16, 2013 10:58 PM
To: Nikita Sharakhov
Subject: Re: [Discuss-gnuradio] Spectrum Sensing

 

Hi Nikita,

'uhd_fft' is only a graphical frontend for your flowgraph. It contains a WX FFT Sink and some information about your setup. The WX FFT Sink itself seems to be so fast because it only calculates about 10 FFTs per second. All the other input samples are simply dropped. If you want to have a real real-time GUI take a look at gr-fosphor.

If a few snapshots of the spectrum per second are sufficient for you, think about a keeping only a tiny fraction of your input samples. This will speed things up. On the other hand, if you want to calculate a FFT for all samples, look at the FFT block. BTW: the output of the FFT block would be the 'raw samples' you were asking for.

Happy hacking

Johannes

 

On Mon, Dec 16, 2013 at 8:03 AM, Nikita Sharakhov <address@hidden> wrote:

I would like to do spectrum sensing with GNU radio. Is there a good way to get the raw output from uhd_fft.py (the value for each frequency)? I would like to do this programatically (with code), rather than through a GUI.

I have tried doing spectrum sensing with usrp_spectrum_sense.py, and this script has questionable accuracy and seems to be much slower than uhd_fft.py.

Thanks!

 

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