On 12/5/06, Dheeraj S. Aralumallige <[EMAIL PROTECTED]> wrote:
Hi !! Thank you very much for the help!!! But still I have one question. (See the highlighted part) Is there any example program to just detect the presence of wi-fi or Bluetooth.
I think Tom answered this question really well. No, it is currently not possible to detect bluetooth because the bandwidth of the USRP is not high enough to cover the whole 2.4 GHz ISM band (~80 MHz) at once. For Wi-Fi, it is possible as long as you are only interested in one channel. Nevertheless, there is a spectrum sweep example (gnuradio-example/usrp/usrp_spectrum_sense.py). This application can sense a large bandwidth, but not in real time! It can do a sweep over a very large frequency range, but it will very likely not be able to detect bluetooth (since it is frequency hopping) nor 802.11b/g since this will most likely just look like noise. Anyway, it is difficult to just detect wi-fi without trying to decode it, since it is not a continuous signal, i.e., packet oriented. Therefore, you won't have a nice peak in your fft, compared to a radio broadcast channel. I suggest you look at the wi-spy (http://www.metageek.net/) if you just want to detect bluetooth or wi-fi. That might be a cheaper and simpler solution to your problem. Hope that helps. Cheers, Thomas _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
