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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
computer science
Recursive sliding discrete Fourier transform with oversampled data
Digital Signal Processing: A Review Journal, Volume 25, No. 1, Year 2014
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Description
The Discrete Fourier Transform (DFT) has played a fundamental role for signal analysis. A common application is, for example, an FFT to compute a spectral decomposition, in a block by block fashion. However, using a recursive, discrete, Fourier transform technique enables sample-by-sample updating, which, in turn, allows for the computation of a fine time-frequency resolution. An existing spectral output is updated in a sample-by-sample fashion using a combination of the Fourier time shift property and the difference between the most recent input sample and outgoing sample when using a window of finite length. To maintain sampling-to-processing synchronisation, a sampling constraint is enforced on the front-end hardware, as the processing latency per input sample will determine the maximum sampling rate. This work takes the recursive approach one step further, and enables the processing of multiple samples acquired through oversampling, to update the spectral output. This work shows that it is possible to compute a fine-grained spectral decomposition while increasing usable signal bandwidths through higher sampling rates. Results show that processing overhead increases sub-linearly, with signal bandwidth improvement factors of up to 6.7× when processing 8 samples per iteration. © 2013 Elsevier Inc.
Authors & Co-Authors
Van Der Byl, Andrew
South Africa, Cape Town
University of Cape Town
Inggs, Michael R.
South Africa, Cape Town
University of Cape Town
Statistics
Citations: 9
Authors: 2
Affiliations: 1
Identifiers
Doi:
10.1016/j.dsp.2013.10.008
ISSN:
10512004