[Discuss-gnuradio] OFDM Example, 'Noisy' final symbol

[David Halls]

Hi Martin, All,

Has anyone noticed that the final symbol of any burst (no matter how many packets in a transmission) appears slightly 'noisy' in the OFDM example code? Is it something to do with my set-up?

I attach a picture of the eq'd FD constellation when I send two packet: a) the first packet, b) the second packet (excluding the final (16th) symbol), and c) second packet (with all symbols)

Is it to do with sample alignment/timing error? I have tried sliding the samples passed to the FFT at the receiver, moving the window backwards and forwards and can't get a better result...

DH

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bpsk_FD_eq_const.tar.gz
Description: bpsk_FD_eq_const.tar.gz