Signal Constellation Plots from Benchmark RX


I am currently running the USRP1 with benchmark tx/rx with dbpsk
modulation to plot the received signal constellation plots from the
data logged files that are already coded in

The problem I am encountering is getting successful received plots of
two distinct point clouds around -1 and 1 like you do when plotting
tx_chunks2symbols.dat using Octave from the transmitter side. I have
tried plotting the receiver side files rx_received.dat and
rx_diffdec.dat but I get alot of junk plots in
between the two points which make the plot look like a big blob.
I have tried using the direct link cable between the two USRP devices
with little to no improvement on the plot.

I also did notice that these two receiver files still log data even
when you do not send any packet data
from benchmark_tx which can be plotted to look like the junk I see in
the plots with received packet data.

If some one could point me in the right direction much appreciated.



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