[Discuss-gnuradio] Using benchmark_ofdm.py & gr_plot_ofdm.py

[Jérémy Skelton]

Hi,

I was taking a look at the ofdm files by using first the benchmark  
with log enabled and then the plot.

First I copied ofdm_frame_sink_c.dat to ofdm_frame_acq_c.dat because  
this last file was missing.

I would like to have some comments about the resulting plot I had :
http://www.skelton.eu.org/Image%201.png

What I mainly don't understand is why the red and the blue parts are  
not the same. According to the python file, it should be the same as  
acq_data and derot_data seem to be processed in parallel with the same  
set of functions and are actually from the same data file.

Secondly, I would like to know exactly what is the meaning of the  
Symbol number on top of the picture. In my mind, a symbol should be  
one element from the constellation.

Then, why is the time scale going to at least 200s as I only ran the  
simulation for a few secondes ?

Finally, how can I generate correctly the ofdm_frame_acq_c.dat file ?


Thanks,
Jérémy