An Efficient FFT For OFDM Based Cognitive Radio On A Reconfigurable Architecture
- 1 June 2007
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- No. 15503607,p. 6522-6526
- https://doi.org/10.1109/icc.2007.1079
Abstract
Cognitive radio is a promising technology to utilize non-used parts of the spectrum that actually are assigned to licensed services. An adaptive OFDM based cognitive radio system has the capacity to nullify individual carriers to avoid interference to the licensed user. Therefore, there could be a considerably large number of zero-valued inputs/outputs for the IFFT/FFT in the OFDM transceiver. Due to the wasted operations on zero values, the standard FFT is no longer efficient. Based on this observation, we propose to use a computationally efficient IFFT/FFT as an option for OFDM based cognitive radio. Mapping this algorithm onto a reconfigurable architecture is discussed.Keywords
This publication has 8 references indexed in Scilit:
- A Reconfigurable Radio Architecture for Cognitive Radio in Emergency NetworksPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2006
- Cognitive radio: brain-empowered wireless communicationsIEEE Journal on Selected Areas in Communications, 2005
- Implementing Non Power-of-Two FFTs on Coarse-Grain Reconfigurable ArchitecturesPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2005
- Spectrum pooling: an innovative strategy for the enhancement of spectrum efficiencyIEEE Communications Magazine, 2004
- Efficient computation of the DFT with only a subset of input or output pointsIEEE Transactions on Signal Processing, 1993
- FFT algorithm for both input and output pruningIEEE Transactions on Acoustics, Speech, and Signal Processing, 1979
- Pruning the decimation in-time FFT algorithmIEEE Transactions on Acoustics, Speech, and Signal Processing, 1976
- FFT pruningIEEE Transactions on Audio and Electroacoustics, 1971