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Technical Program

Paper Detail

Paper:	DISPS-P3.5
Session:	Design and Mapping Techniques for DSP Systems
Time:	Friday, May 19, 16:30 - 18:30
Presentation:	Poster
Topic:	Design and Implementation of Signal Processing Systems: Design of Programmable Signal Processors
Title:	DESIGN OF APPLICATION SPECIFIC PROCESSORS FOR THE CACHED FFT ALGORITHM
Authors:	Oguzhan Atak, Abdullah Atalar, Erdal Arikan, Bilkent University, Turkey; Harold Ishebabi, David Kammler, Gerd Ascheid, Heinrich Meyr, University of Technology Aachen (RWTH), Germany; Mario Nicola, Guido Masera, Politecnico di Torino, Italy
Abstract:	FFT and inverse FFT (IFFT) are kernel processing blocks in an OFDM system. OFDM systems are required to be flexible to accommodate different standards and operation modes, in addition to being energy-efficient. A trade-off between these two conflicting requirements can be achieved by employing Application-Specific Instruction-Set Processors (ASIPs). In this paper, two ASIP design concepts for the Cached FFT algorithm (CFFT) are presented. A reduction in energy dissipation of up to 25% is achieved compared to an ASIP for the Cooley-Tukey FFT algorithm. Further, a modified CFFT algorithm which enables a better cache utilization is presented. This modification reduces the energy dissipation by up to 10% compared to the original CFFT implementation.