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Reduced transceiver-delay for OFDM systems

På svenska

Author

  • Fredrik Kristensen
  • Peter Nilsson
  • Anders Olsson

Summary, in English

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

Publishing year

2004

Language

English

Pages

1242-1245

Publication/Series

2004 IEEE 59th Vehicular Technology Conference. VTC 2004-Spring

Document type

Conference paper

Publisher

IEEE - Institute of Electrical and Electronics Engineers Inc.

Topic

  • Electrical Engineering, Electronic Engineering, Information Engineering

Keywords

  • 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

Conference name

IEEE Vehicular Technology Conference, VTC Spring, 2004

Conference date

2004-05-17 - 2004-05-19

Conference place

Milan, Italy

Status

Published

Research group

  • Elektronikkonstruktion

ISBN/ISSN/Other

  • ISBN: 0-7803-8255-2