An efficient pipelined FFT architecture

This paper presents an efficient VLSI architecture of the pipeline fast Fourier transform (FFT) processor based on radix-4 decimation-in-time algorithm with the use of digit-serial arithmetic units. By combining both the feedforward and feedback commutator schemes, the proposed architecture can not only achieve nearly 100% hardware utilization, but also require much less memory compared with the previous digit-serial FFT processors. Furthermore, in FFT processors, several modules of ROM are required for the storage of twiddle factors. By exploiting the redundancy of the factors, the overall ROM size can be effectively reduced by a factor of 2.