Aiming at the characteristics of variable length subcarriers in WIMAX system, a pipeline ping-pong structure is adopted to realize high-speed configurable FFT/IFFT with mixed radix of radix 2 and radix 4. The FFT rotation factors of different points are stored uniformly, and the RAM unit is optimized to save storage space; in addition, the radix 4 butterfly unit is optimized to reduce the addition and multiplication operation units.
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