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Design and Implementation of a Power-aware FFT Core for OFDM-based DSA-enabled Cognitive Radios

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Original languageEnglish
Pages (from-to)257-265
Number of pages9
JournalJournal of Signal Processing Systems
Issue number3
Early online date1 Jan 2014
Publication statusPublished - 2015
Publication typeA1 Journal article-refereed


This research work presents the design and the physical implementation of a power aware FFT core for OFDM-based, dynamic spectrum access (DSA) enabled cognitive radios. The FFT core is equipped with a pruning engine that allows the run-time removal of dummy operations (e.g. multiplications by a zero term) related to the pruning of sub-carriers of the communication systems. The pruning algorithm introduced by this research work utilizes a reduced size configuration matrix, which limits the memory requirements' overhead. Finally, the physical implementation of the FFT on a 45 nm technology node showed that, for a 8 % area overhead, the total power saving settles around 10 % when in the presence of a medium to high pruning level, justifying the silicon area overhead introduced by the pruning unit.


  • Cognitive radios, Dynamic spectrum access, OFDM, FFT pruning, Low power design, WIRELESS ACCESS, ALGORITHM, TECHNOLOGY, SYSTEMS

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