A cost-effective memory-based real-valued FFT and hermitian symmetric IFFT processor for DMT-based wire-line transmission systems

Abstract

This paper presents an efficient computation scheme for the memory-based FFT/IFFT processor used in DMT (discrete multi-tone) systems. Only half-size FFT/IFFT is required to transform real-valued data and Hermitain symmetric data. That is, the cost in processing elements and memory can be reduced by two. Finally, a variable-size radix-4 memory-based FFT/IFFT processor with block scaling scheme is designed for DMT systems.