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

From: Eric Blossom
Subject: Re: [Discuss-gnuradio] Using benchmark_ofdm.py & gr_plot_ofdm.py
Date: Thu, 5 Feb 2009 07:24:12 -0800
User-agent: Mutt/1.5.18 (2008-05-17)

On Wed, Feb 04, 2009 at 07:26:33PM +0100, Jérémy Skelton wrote:
> Hi,
> I would like to have some comments about the resulting plot I had :
> http://www.skelton.eu.org/Image%201.png
> 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.

That would be the case something like QAM, but with OFDM, there's a
constellation point for each bin of the FFT.  The symbols are quite long.

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

Not sure.  Have you looked at the code to see what it's actually plotting?


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