"Zeph80" <[email protected]> wrote in message
news:[email protected]..
> Cyclic prefix at the head of ea symbol, will prevent ISI, but what about
> the tail end of the symbol.Isn't that going to subjected to precursor ISI
> and be distorted too.How then does cyclic prefix combat precursor ISI

I thought the point of the cyclic prefix was to make the time waveform
circularly symmetric so that when the FFT is taken over the middle portion
all of the echos add constructively to the FFT result. It shouldn't matter
whether the echo is early or late so long as the ends meet on the portion
that falls in the FFT window.

-Clark