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Discussion Groups | Matlab DSP | can the output of QAM be given directly to IFFT ?

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

  

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can the output of QAM be given directly to IFFT ? - jahn...@yahoo.co.in - Dec 26 9:13:29 2006



   I am doing a project regarding OFDM.I used 64 QAM to modulate the data . The output of
QAM is complex.
      Can the complex output be given directly to perform IFFT ?


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Re: can the output of QAM be given directly to IFFT ? - Amit Pathania - Dec 27 8:18:24 2006

Yes.

j...@yahoo.co.in wrote:                                     I am doing a project regarding
OFDM.I used 64 QAM to modulate the data . The output of QAM is complex.
       Can the complex output be given directly to perform IFFT ?

Amit Pathania


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Re: can the output of QAM be given directly to IFFT ? - Jeff Brower - Dec 27 8:18:54 2006

Jahnavi-

>    I am doing a project regarding OFDM.I used 64 QAM to modulate the data .
> The output of QAM is complex.
>       Can the complex output be given directly to perform IFFT ?

If this is transmission side, then yes.  Be careful to choose iFFT size depending on
number of subchannels.  Here is a good description (sorry not MATLAB):

  http://zone.ni.com/devzone/cda/ph/p/id/150

-Jeff


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