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Cyclic Prefix and Zero Padding.

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afolz

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Hello All,
I recently started studying OFDM systems. However, I'm kindof hazy about the differences, similarities or relationship(s) between cyclic prefix and zero padding.


THankx
 

Zero padding is usually done to complete a packet/block size so that operations which happen on some specific size of blocks can be performed.

However Cyclic prefix is a way to eleminate ISI. This is done after performing IFFT and when the OFDM symbols are ready to be transmitted.
 

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    afolz

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Zero Padding is actually done for i) complete a packet block size but more importantly ii) it is used to 'zero' out the information of band-edge carriers.

If this is not done then the information on those carriers would be severely attenuation by the filters in the transmitter even before it goes through the channel. The problem is due to the need of using window functions in the FFT
 

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