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Orthogonal Frequency Division Multiplexing (OFDM) is a popular technique used to combat frequency selective fading in multipath channels. When spectral nulls are present in the channel, they can severely degrade or cancel out OFDM tones, resulting in an irreducible error rate. To combat this, standards typically employ Forward Error Correction (FEC) techniques. Code-Spread OFDM (CS-OFDM) combines the characteristics of OFDM and Code Division Multiple Access (CDMA) to create a more robust modulation scheme which provides substantial performance improvements relative to standard OFDM. In CS-OFDM, each sine-wave carries a weighted sum of all the information symbols being transmitted in an OFDM block interval.
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