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Implementation of radix 2 and radix 22 FFT algorithms on Spartan6 FPGA

The Fast Fourier Transform (FFT) and its inverse (IFFT) are very important algorithms in digital signal processing and communication systems. Radix-2 FFT algorithm is the simplest and most common form of the Cooley-Tukey algorithm. Radix-22 FFT algorithm is an attractive algorithm having same multiplicative complexity as radix-4 algorithm, but retains the simple butterfly structure of radix-2 algorithm. These algorithms have been developed using Verilog hardware description language and implemented on Spartan6 FPGA.