CORDIC-BASED FFT AND IFFT APPARATUS AND METHOD

摘要

Disclosed is an apparatus for performing a 2-point FFT, comprising two CORDIC processors (C1 and C2), each including: two input ports (p1 and P2) that respectively represent real input port and imaginary input port; and two output ports (P1 and P2) that respectively represent real output port and imaginary output port for outputting rotated data; wherein real part of a first input signal (s1) is applied to the imaginary input port (p2) of the first CORDIC processor(C1); imaginary part of a first input signal (s1) is applied to the imaginary input port (p2) of the second CORDIC processor(C2); real part of a second input signal (s2) is applied to the real input port (p1) of the first CORDIC processor (C1); imaginary part of the second input signal (s2) is applied to the real input port (p1) of the second CORDIC processor (C2); the first and second CORDIC processors rotate the respective input signals applied thereto by 45 degrees in the clockwise direction; data from the real output port (P1) of said first CORDIC processor (C1), and data from the real output port (P2) of the second CORDIC processor (C2), constitute respectively real part and imaginary part of a first output signal (S1); and data from the imaginary output port (P2) of said first CORDIC processor (C1), and data from the imaginary output port (P2) of said second CORDIC processor constitute respectively real part and imaginary part of a second output signal (S2).