Document Detail

Elimination of corner-turning in FFT-based sonar array beamforming.
MedLine Citation:
PMID:  18532769     Owner:  NLM     Status:  In-Data-Review    
The expected availability, in the near future, of an ultralow power version of the revolutionary IBM CELL multicore processor opens unprecedented opportunities for implementing sophisticated signal processing algorithms faster and within a much lower energy budget. The concept of "corner turning" has been, for many decades, at the heart of array beamforming via Fourier transforms. As widely reported in the open literature (both for sonars and radars), the computational sequence involving corner turning operations, i.e., the sequence: temporal Fourier transforms --> data cube corner turning --> spatial Fourier transforms, constitutes one of the primary obstacles to achieving high-performance and lower power dissipation (by reducing the number of times memory is accessed). Even with the emergence of novel multicore processors, leading providers (e.g., Mercury Computers) still include explicit corner turning stages in their computational flow architectures for multidimensional array processing. The primary innovation reported in this paper addresses the development of a computational scheme that avoids altogether the corner turning stage. We discuss its implementation on currently available CELL technology (65 nm SOI) and demonstrate close to an order of magnitude speed-up compared to the scheme with corner turning implemented on the same processor.
Jacob Barhen; Travis Humble; Michael Traweek
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of the Acoustical Society of America     Volume:  123     ISSN:  1520-8524     ISO Abbreviation:  J. Acoust. Soc. Am.     Publication Date:  2008 May 
Date Detail:
Created Date:  2008-06-05     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7503051     Medline TA:  J Acoust Soc Am     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3950     Citation Subset:  IM    
Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, TN 37831-6015, USA,
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