Conceptually, OFDM is a specialized frequency-division multiplexing (FDM) method , with the additional constraint that all subcarrier signals within a communication channel are orthogonal to one another.
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Unsourced material may be challenged and removed. Orthogonal frequency-division multiple access (OFDMA) is a multi-user version of the popular orthogonal frequency-division multiplexing (OFDM) digital modulation scheme . Multiple access is achieved in OFDMA by assigning subsets of subcarriers to individual users.
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