A 640 MHz 32 megachannel real-time polyphase-FFT spectrum analyzer
- 9 December 2002
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
Abstract
A 2 25 (33,554,432) channel, 640 MHz wide polyphase-fast Fourier transform (FFT) spectrum analyzer is being designed at the Jet Propulsion Laboratory for the Search for Extraterrestrial Intelligence (SETI) Sky Survey. By replacing the time-domain multiplicative window preprocessing with polyphase filter processing, much of the processing loss of windowed FFTs can be eliminated. Polyphase coefficient memory costs are minimized by effective use of run-length compression. Finite word length effects are analyzed, producing a balanced system with 8 bit inputs, 16 bit fixed-point polyphase arithmetic and 24 bit fixed-point FFT arithmetic. Fixed-point renormalization midway through the computation is seen to be naturally accommodated by the matrix FFT algorithm proposed Author(s) Zimmerman, G.A. Jet Propulsion Lab., California Inst. of Technol., Pasadena, CA, USA Garyantes, M.F. ; Grimm, M.J.Keywords
This publication has 2 references indexed in Scilit:
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