Fast Hybrid DFT/DCT Architecture for OFDM in Cognitive Radio System
- 1 January 2007
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- Vol. 1 (21531447) , 301-306
- https://doi.org/10.1109/fgcn.2007.124
Abstract
In this paper, the sparse matrix decompositions for DFT matrix and DCT matrix are proposed. Based on these propositions, we develop a fast hybrid DFT and DCT architecture for OFDM. In addition, we address the OFDM based on DFT or DCT in Cognitive Radio system. An adaptive OFDM based on DFT or DCT in Cognitive Radio system has the capacity to nullify individual carriers to avoid interference to the licensed users. Therefore, there could be a considerably large number of zero-valued inputs/outputs for the IDFT/DFT or IDCT/DCT on the OFDM transceiver. Hence, the standard methods of DFT and DCT are no longer efficient due to the wasted operations on zero. Based on this observation, we present a transform decomposition on two dimensional (2-D) systolic array for IDFT/DFT and IDCT/DCT, this algorithm can achieve an efficient computation for OFDM in Cognitive Radio system.Keywords
This publication has 8 references indexed in Scilit:
- An Efficient FFT For OFDM Based Cognitive Radio On A Reconfigurable ArchitecturePublished by Institute of Electrical and Electronics Engineers (IEEE) ,2007
- Discontiguous OFDM considerations for dynamic spectrum access in idle TV channelsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2005
- Dynamic spectrum sensing by multiband OFDM radio for interference mitigationPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2005
- On the discrete cosine transform and OFDM systemsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2004
- Efficient computation of the DFT with only a subset of input or output pointsIEEE Transactions on Signal Processing, 1993
- High speed multidimensional systolic arrays for discrete Fourier transformIEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing, 1992
- On computing 2-D systolic algorithm for discrete cosine transformIEEE Transactions on Circuits and Systems, 1990
- Real-valued fast Fourier transform algorithmsIEEE Transactions on Acoustics, Speech, and Signal Processing, 1987