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In this paper, the authors present a novel 128/64 point Fast Fourier Transform (FFT)/ Inverse FFT (IFFT) processor for the applications in a multiple-input multiple-output orthogonal frequency-division multiplexing based IEEE 802.11n wireless local area network baseband processor. The unfolding mixed-radix multipath delay feedback FFT architecture is proposed to efficiently deal with multiple data sequences. The proposed processor not only supports the operation of FFT/IFFT in 128 points and 64 points but can also provide different throughput rates for 1 - 4 simultaneous data sequences to meet IEEE 802.11n requirements.
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