Reconfigurable FFT using CORDIC based architecture for MIMO-OFDM receivers

Fast Fourier Transform (FFT) is one of the most important algorithm in signal processing and communications and is used in orthogonal frequency division multiplexing (OFDM) systems. FFT are the crucial computational blocks to perform the baseband multicarrier demodulation in a MIMO OFDM system and the hardware complexity will be very high. This paper proposes a CORDIC based reconfigurable 64 point Fast Fourier Transform which is used for various IEEE standard based WLAN receivers. The CORDIC based FFT block minimizes the hardware complexity because of the elimination of multiplier units and twiddle factors. This design has the minimal hardware and computational complexity to meet the IEEE standard. In this paper, a reconfigurable FFT has been realized based on CORDIC architecture. The coding for reconfigurable 64 point FFT has been done using VHDL under Xilinx platform. The results are verified and are found to be compatible with Virtex xc6vcx240t-2ff704.