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

[Shirve]

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 <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
>> --
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>> Sent from the GnuRadio mailing list archive at Nabble.com.
>>
>>
>>
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> 
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