Gr_plot_ofdm

GNU Radio
1

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

2

Quoting matteo zunino [email protected]:

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