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Cost-efficient Mapping of 3- and 5-point DFTs to General Baseband Processors
Linköpings universitet, Institutionen för systemteknik, Datorteknik. Linköpings universitet, Tekniska fakulteten.
Linköpings universitet, Institutionen för systemteknik, Datorteknik. Linköpings universitet, Tekniska fakulteten.
Linköpings universitet, Institutionen för systemteknik, Datorteknik. Linköpings universitet, Tekniska fakulteten.
2015 (engelsk)Inngår i: International Conference on Digital Signal Processing (DSP), Singapore, 21-24 July, 2015, Institute of Electrical and Electronics Engineers (IEEE), 2015, s. 780-784Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

Discrete Fourier transforms of 3 and 5 points are essential building blocks in FFT implementations for standards such as 3GPP-LTE. In addition to being more complex than 2 and 4 point DFTs, these DFTs also cause problems with data access in SDR-DSPs, since the data access width, in general, is a power of 2. This work derives mappings of these DFTs to a 4-way SIMD datapath that has been designed with 2 and 4-point DFT in mind. Our instruction set proposals, based on modified Winograd DFT, achieves single cycle execution of 3-point DFTs and 2.25 cycle average execution of 5-point DFTs in a cost-effective manner by reutilizing the already available arithmetic units. This represents an approximate speed-up of 3 times compared to an SDR-DSP with only MAC-support. In contrast to our more general design, we also demonstrate that a typical single-purpose FFT-specialized 5-way architecture only delivers 9% to 25% extra performance on average, while requiring 85% more arithmetic units and a more expensive memory subsystem.

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Institute of Electrical and Electronics Engineers (IEEE), 2015. s. 780-784
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Identifikatorer
URN: urn:nbn:se:liu:diva-120397DOI: 10.1109/ICDSP.2015.7251982ISI: 000380506600164ISBN: 978-1-4799-8058-1 (tryckt)OAI: oai:DiVA.org:liu-120397DiVA, id: diva2:844270
Konferanse
IEEE International Conference on Digital Signal Processing (DSP)
Prosjekter
HiPECTilgjengelig fra: 2015-08-04 Laget: 2015-08-04 Sist oppdatert: 2018-01-11

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Karlsson, AndreasSohl, JoarLiu, Dake

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