FPGA implementation of a re-configurable FFT for multi-standard systems in software radio context

This study is focused on the Field Programmable Gate Array (FPGA) implementation of a reconfigurable Fast Fourier Transform (FFT) operator able to provide Fourier transforms both over infinite complex field C and Galois finite Field GF. This reconfigurable FFT exploits to a great advantage the possibility to share hardware resources when considering multi-standard scenario for software radio systems. A reconfigurable FFT of length N=256 has been implemented on FPGA/STRATIX II. It achieves a performance-to-cost ratio gain from 24% to 9.4% compared to the basic duplicated solution for which no reconfiguration is considered.