Re: [Discuss-gnuradio] Packet Loss Rate/Bit Error Rate

[Eric Blossom]

On Fri, Jul 25, 2008 at 09:45:55AM -0700, kaleem ahmad wrote:
> 
> I am using RFX2400 daughter boards,
> VERT2450 antenna which I received with my USRP from ettus,
> I have tried different bitrates from 40kbps - 100kbps but got same results,
> I am not observing any overrun or underrun,
> I am working in office environment where I dont have any interference
> (almost),
> Gain = 0, but I have tried other values [0-20].
> 
> Thanks


What version of GNU Radio are you using?

There is no FSK code in the trunk nor in the latest tarball.  I
removed it long ago because the code that was there didn't work and
there was no one maintaining it.

You can save yourself and the rest of us a lot of trouble by using the
latest code either from a tarball or the svn trunk.  Since you appear
to be somewhat of a beginner, I suggest you start with a tarball:

  http://gnuradio.org/trac/wiki/Download

Eric



> George Nychis wrote:
> > 
> > 
> > 
> > kaleem ahmad wrote:
> >> If someone has ever measured Quality of service of received data (using
> >> any
> >> modulation and daughter board but preferably RFX2400) in terms of packet
> >> loss rate/Bit Error Rate (or any other metric) with USRP & GNU Radio
> >> without
> >> any error correction (ARQ,FEC) mechanism (but no problem if you have with
> >> error correction mechnism) then please share your results here. 
> >> 
> >> Actually without and error correction mechanism, with FSK, I am getting
> >> almost half of my data lost. I was thinking that it may be improved by
> >> adding some error correction mechanism. Or this high data loss is because
> >> of
> >> some implementation errors...What do you say ??????????
> >> 
> > 
> > We have no idea what your actual setup is, so we have no clue whether or 
> > not error correction will truly help you.
> > 
> > It's like saying my computer crashed, and asking if a new hard drive 
> > will help.  Who knows, it all depends :)
> > 
> > Some questions that might help:
> >   - are you using coax?
> >   - are you using antennas?
> >   - what kind of gain are you using?
> >   - what kind of physical conditions?
> >   - what bitrate are you using?
> >   - are you seeing underruns at your receiver?
> > 
> > - George