Well, the cylic prefix exists to combat ISI and the contents itself(tail o
the symbol) lends itself to making the channel look like a circula
convolution.So it really has a dual purpose, and my question is not th
contents of the cylic prefix, but how its existence will remove ISI


>"Zeph80" <[email protected]> wrote in message
>news:[email protected]..
>> Cyclic prefix at the head of ea symbol, will prevent ISI, but wha
about
>> the tail end of the symbol.Isn't that going to subjected to precurso
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 middl
portion
>all of the echos add constructively to the FFT result. It shouldn'
matter
>whether the echo is early or late so long as the ends meet on th
portion
>that falls in the FFT window.
>
>-Clark
>
>
>