Re: [Discuss-gnuradio] OFDM channel tap questions

[Jeff Long]

Ah, normalization was the secret. The phase offset is there because the 
subcarriers frequencies each look like a phasor that keeps moving (at a 
rate relative to its offset). You want to predict what the phase will be 
at the next symbol.

On 01/12/2018 01:59 PM, edwin wrote:
> Hi Jeff,
>
> I just found out that if I normalize these taps by the FFT number(64 in 
> this case), they have magnitude of 1! Now my questions are:
>
> Why are there phase offset? The phase offset for each subchannel seems 
> different. Is it because of imperfect synchronization?
>
>
> Regards,
>
> Edwin