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In page Orthogonal frequency-division multiplexing:

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In a sense, improvements in FIR equalization using FFTs or partial FFTs leads mathematically closer to OFDM,[citation needed] but the OFDM technique is easier to understand and implement, and the sub-channels can be independently adapted in other ways than varying equalization coefficients, such as switching between different QAM constellation patterns and error-correction schemes to match individual sub-channel noise and interference characteristics.