An Efficient FFT Architecture for OFDM Communication Systems

Abstract

This paper presents a high level implementation of a high performance FFT for Modulator and Demodulator in OFDM. The design has been coded in VHDL and targeted into Xilinx Virtex-E XCV3200E FPGAs. The hardware requirement comparison shows that our implementation outperforms other implementations of FFT on the same series of FPGAs. Radix-22 algorithm has the same multiplicative complexity as the radix-4 algorithm, but retains the butterfly structure of radix-2 algorithm.