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In this paper, the authors focus on the OFDM Kernel which refers to the inverse fast Fourier transform and cyclic prefix insertion blocks in the downlink flow and the FFT and cyclic prefix removal blocks in the uplink flow. To support Orthogonal Frequency-Division Multiple Access (OFDMA) an extension to the OFDM kernel is required that allows each user to be allocated with a portion of the available carriers. This process is referred to as sub channelization. The WiMAX building blocks include bit-level, OFDMA symbol-level, and digital intermediate frequency processing blocks.
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