Re: [Discuss-gnuradio] how to Sense the spectrum bycomparing calculated energy with threshold

[Jincheng Zhang]

Now I have a strange problem. When I add the parameter "log" to the function "self.connect", the FFT bin values I got are all zero. But if I just use self.connect(self.u, s2v, fft, c2mag, stats), some FFT bin values will be very large, even bigger than 5000 sometimes. Should I add the parameter "log"? Do you know how to solve this problem? Thanks. 

On Tue, Apr 9, 2013 at 3:58 PM, Nemanja Savic <address@hidden> wrote:

I was designing something similar. It's a block that calculates square value of the signal and there are two "thresholds", first is power threshold and the second is time threshold, which means that in order to be detected, burst must have appropriate power and duration. This explains nothing, but maybe you will get some ideas.

Best

On Mon, Apr 8, 2013 at 5:16 PM, Jincheng Zhang <address@hidden> wrote:

Hi, Omer,

 

That’s exactly what I want to do. But I use the usrp_spectrum_sense.py to get each channel’s power and then compare with the threshold. Maybe you should try the usrp_spectrum_sense.py.

 

_______________________________________________
Discuss-gnuradio mailing list
address@hidden
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio

--
Nemanja Savić

--

Best regards,

Jincheng Zhang
Department of Information Engineering

The Chinese University of Hong Kong

http://personal.ie.cuhk.edu.hk/~zj012/