[Discuss-gnuradio] fft monitoring of more than one channel

[Sebastian Döring]

Hello list,

I modified the usrp_spectrum_sense.py to work as an energy 
detector based on the Neyman-Pearson Theorem. So basically 
the algorithm is supposed to tell me if a certain part of 
the spectrum is occupied or not.

I simply wrote the output into a text file to see I it is 
working at all, but right now I am trying to find a way to 
somehow monitor the it in a large plot, that dynamically 
changes with the current detection results.
That means that if I am sensing the spectrum for example 
between 2.4 and 2.5GHz in steps of 20MHz, I want the the 
whole bandwidth to be graphically displayed in some kind 
of plot (x-Axis = frequency, y-Axis = "0"/"1"), which is 
divided into parts of 20MHz.
The channel states are supposed to get updated every time 
the channel is sensed again, just like the output is 
already doing.

I first thought that gtgui_sink_x might be the right 
thing, but since I am peridically changing the frequency 
and the sink is designed to look at a single center 
frequency, I don know how to append several frequency 
windows to a large one.
I dont know if what I am planning to do is even possible 
using gnu radio only.

I higly appreciate any suggestions.
Thanks in advance.

-Sebastian