Description: basic concept of OFDM is quite simple [4]–[7]. Data is transmitted in parallel on a number of different frequencies, and
as a result the symbol period is much longer than for a serial
system with the same total data rate. Because the symbol period
is longer, ISI affects at most one symbol, and equalization is
simplified. In most OFDM implementations any residual ISI is
removed by using a form of guard interval called a cyclic prefix.
When frequency division multiplexing (FDM) is used in conventional wireless systems, or wavelength division multiplexing
(WDM) is used in optical systems, information is also transmitted on a number of different frequencies simultaneously.
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Optimum_OFDM_Receiver_1.pdf
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