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IFFT in OFDM, real output requires conjugate symmetric

Started by vcteo April 17, 2006
Hi, i've forgotten where i read about this but i know for OFDM, if i
want the output of my IFFT to be real, i can only use half of the
subcarriers with the other half the complex conjugate mirror of the 1st
half. It apparantly got to do with the properties of Fourier transform
or something like that.

I'm currently writing my report on OFDM. Can someone direct me to
references or literature with statements above so that i can add to my
reference?
That is real baseband OFDM signal. I remember reading about this in one of
the thesis by Brian Scott Krongold. I am sure you can find references if you
look that up. The thesis is availble online.

On 4/14/06, vcteo wrote:
>
> Hi, i've forgotten where i read about this but i know for OFDM, if i
> want the output of my IFFT to be real, i can only use half of the
> subcarriers with the other half the complex conjugate mirror of the 1st
> half. It apparantly got to do with the properties of Fourier transform
> or something like that.
>
> I'm currently writing my report on OFDM. Can someone direct me to
> references or literature with statements above so that i can add to my
> reference?