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

From: Jérémy Skelton
Subject: [Discuss-gnuradio] Using benchmark_ofdm.py & gr_plot_ofdm.py
Date: Wed, 4 Feb 2009 19:26:33 +0100


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 :

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 ?


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