Re: [Discuss-gnuradio] gr_plot_ofdm

[trondeau]

Quoting matteo zunino <address@hidden>:

>
> Hi,
>
> i've done the simulation, but i've a question. In the graphs the program did,
> the are, in the constellation rappresentation, blue and red points. What do
> they rappresent?
>
> thanks a lot
>
> matteo

Yeah, that's a bit confusing and a good question.

We use a decision directed equalizer inside of the receiver to track the
residual frequency error from the synchronization methods. The blue points
represent the pre-equalized values and the red the post-. You'll notice that
the blue points will slowly spin as the symbols progress while the red dots
stay locked to their constellation points.

Tom