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Discussion Groups | Matlab DSP | IFFT in OFDM, real output requires conjugate symmetric

Technical discussion about Matlab and issues related to Digital Signal Processing.

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IFFT in OFDM, real output requires conjugate symmetric - vcteo - Apr 17 10:32:31 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?

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Re: IFFT in OFDM, real output requires conjugate symmetric - Bavithi - Apr 19 9:17:45 2006

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 <v...@yahoo.com> 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?

(You need to be a member of matlab -- send a blank email to matlab-subscribe@yahoogroups.com )