Hi all,
I am recently doing a project on gnu radio and usrp2. My goal is to implement DSA: let Tx sense some bands, choose available one by energy detection, then tune the usrp2 to this frequency and transmit a signal.
This might sound quite simple and basic for you, but I find it very hard to get started. I have tried some ways:
1. To write blocks for GRC:
I have written a energy detection block find no way to realize the band switching function. Also, my energy detection block can only sense the signal USRP2 received from a fixed frequency (i.e. from usrp2_source block). How could I change the frequency during the detection? I cannot think of a way to make the one-way flow of GRC to do some feedback functions.
2. To extend/modify usrp_spectrum_sense.py:
I cannot figure out what is going on in gr_bin_statistic block (even with the detailed explanation from Firas): dose it just copy data from FFT and window block and save them in a .dat file? If it can generate the raw file, what is happening in the main_loop and m.data? Is m.data a file too?
Sorry for so much words but I feel I am totally lost in scripts. I am still new to this and I cannot find a place to dive into and get work done. I believe there should be some quite simple and straightforward way to realize DSA. Would anyone point a way for me to go?
Any help would be appreciated. Thank you.