Hi Zhenghao, Thank you for your valuable reply. I appreciate it. As per your supplied information, I will start looking for CSMA code in tunnel.py, though if you can send me your code, it will be quite helpful too. I hope that using tunnel.py code and help from you I will be able to get the carrier sense capability for my application.
Thanks -Sachin Zenny Zhang wrote: > > Sachin, > > I don't know if this is helpful, just sharing my experience. > > 1. You may want to check tunnel.py, in which there is a CSMA scheme -- > Eric told me this a couple of weeks ago. > 2. It is possible to do some carrier sensing by ourself. You can just > read the signal from the USRP and compare the signal strength level > with a threshold. Of course a filter is needed. I tried this last week > and it is working, although the threshold may need some tuning. If you > need I can send you the code written in python. > > Zhenghao > > On Wed, Oct 22, 2008 at 6:19 PM, Shirve <[EMAIL PROTECTED]> wrote: >> >> Hi, >> As per the current status of GNU Radio, I got to know that there is no >> MAC >> (CSMA) implementation. Therefore I am not sure if I can get the signal >> from >> signal processing blocks of GNU Radio about the carrier sensed by USRP >> receiver. >> >> Please help me in this regard. >> >> Till now I am able to locate the message queue mechanism to get the >> received >> packets from the other USRP transmitter, which is in gr_msg_que.cc in >> runtime library of GNUradio-core. But this mechanism just indicates the >> received packets (correct or corrupted), while the signal sensing (packet >> start) starts much earlier than the complete packet reception. >> >> Is it possible to get the information about the wireless carrier signal >> in >> the vicinity of USRP receiver from the current GNU Radio framework? I am >> using GNU Radio 3.1.1 version. >> >> Your help will greatly help me in my goal. Thanks in advance and >> expecting >> your kind reply. >> >> - Sachin >> -- >> View this message in context: >> http://www.nabble.com/how-to-get-wireless-carrier-signal-in-GNU-Radio-tp20120856p20120856.html >> Sent from the GnuRadio mailing list archive at Nabble.com. >> >> >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> Discuss-gnuradio@gnu.org >> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > -- View this message in context: http://www.nabble.com/how-to-get-wireless-carrier-signal-in-GNU-Radio-tp20120856p20139200.html Sent from the GnuRadio mailing list archive at Nabble.com. _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
