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Reduced transceiver-delay for OFDM systems
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- Kristensen, Fredrik (author)
- Lund University,Lunds universitet,Institutionen för elektro- och informationsteknik,Institutioner vid LTH,Lunds Tekniska Högskola,Department of Electrical and Information Technology,Departments at LTH,Faculty of Engineering, LTH
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- Nilsson, Peter (author)
- Lund University,Lunds universitet,Institutionen för elektro- och informationsteknik,Institutioner vid LTH,Lunds Tekniska Högskola,Department of Electrical and Information Technology,Departments at LTH,Faculty of Engineering, LTH
- Olsson, Anders (author)
- (creator_code:org_t)
- 2004
- 2004
- English.
- In: 2004 IEEE 59th Vehicular Technology Conference. VTC 2004-Spring. - 0780382552 ; , s. 1242-1245
- Conference paper (peer-reviewed)
Abstract
Subject headings
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- In this paper, it is shown that more than half of the data flow buffer, due to a bit reversed FFT output and cyclic prefix in an OFDM transceiver, can be removed. To achieve this, a new pipelined FFT processor is proposed and a cyclic suffix is used instead of the more commonly used cyclic prefix. The FFT processor is used either with a forward or backward data flow, i.e. performing either a decimation in time or a decimation in frequency FFT. However, this approach precludes wordlength optimization in the processor and therefore a semi floating-point arithmetic is used to achieve high signal-to-noise ratio. Total delay through the transceiver is reduced by 25% and for larger transceivers silicon area is reduced by as much as 25%. In addition, the proposed scheme reduces the required amount of memory accesses to insert a cyclic extension, and has the basic properties of a simple interleaver
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)
Keyword
- silicon area reduction
- memory accesses reduction
- cyclic extension insertion
- semi floating-point arithmetic
- frequency decimation
- time decimation
- backward data flow
- forward data flow
- cyclic suffix
- pipelined FFT processor
- bit reversed FFT output
- cyclic prefix
- interleaver
- data flow buffer
- high signal-to-noise ratio
- transceiver delay reduction
- OFDM transceiver
Publication and Content Type
- kon (subject category)
- ref (subject category)
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