Re: [Discuss-gnuradio] how to get wireless carrier signal in GNU Radio

[Zenny Zhang]

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 <address@hidden> 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
> address@hidden
> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>