Implement CCA (Clear Channel Assessment) function with USRP2


I’m developing some 802.11-a MAC functionalities and now I’m facing with
CCA logical function. I’ll begin with the easiest CCA method:
Energy detection bases the CCA decision only on whether energy was
detected over a detection bases threshold.
I’m trying to find out the way to detect the amount energy detected on
the antenna at 2.4GHz or 5 GHz with the USRP2+XCVR2450 daughterboard,
but I don’t know how to deal with this.

Do you know what blocks should I use to create the flow graphs?

I’d like to do something like the python script from
gnuradio source. I mean, if I have the measurement of the detected
energy at any frequency, I’ll manage the information in MAC layer to
make the proper decision.

Thank you for your time and your help,

Juan Ramon Gutierrez A. [email protected]