Hello!
As to introduct me, im very new to GnuRadio and the general topic of
SDR.
However, i have a project in which i should implement a very basic way
of
sending packets. This given packet format has a constant preamble and a
constant length of appended databits. For detecting those out of a
stream
etc. ive already written a working matlab script, now im stuck at the
GnuRadio side.
As a simple Presentation it would be enough to save a captured bitstream
from GnuRadio to harddrive which i later load in Matlab and send it
through
my script.
So my question is, how can setup the most easily a one way tx/rx
connection
between 2 SDR’s, without any packet format or, which simply gives me the
received bits? My basic idea is like that:
TX: http://gnuradio.4.n7.nabble.com/file/n38924/tx.png
RX: http://gnuradio.4.n7.nabble.com/file/n38924/rx.png
I simply cant get it working at all. It would be too kind if somebody
could
give me some kind of introduction how to handle that.
You have a few options. You can build a digital tx/rx in GRC, run an
example like tunnel.py, etc. I’ve also created a set of examples with a
libraby called pre-cog, which you can see here:
Thank you for the advising! That looks like something what i could use.
I just came up with another question:
I simply tried to simulate a DPBSK Path with noise, loaded from a file
and
sinked to a file. Between Demod and Sink i placed a “Pack K Bits” with
K=8. http://gnuradio.4.n7.nabble.com/file/n38935/08.png
But my received data just contains 0’s! It has the right length, but
just
zeros… Any ideas anyone?
I have a random source hooked to a Modulator and then to USRP. From
the
same device i listen at the same Frequency. But since the antennas are
just
a few cm’s away, the constellation graph is completely diffuse and the
points are anywhere, there arent any fixed points noticeable. Do I have
to
change something at the gain or add something? http://gnuradio.4.n7.nabble.com/file/n38994/const.png
How can i differentiate if there is a signal receiving or just some
background noise. I mean if i put the Demodulator directly after the
USRP
and stream it to file, then of course ill mostly get just random
amplified
noise…
