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Träfflista för sökning "WFRF:(Kristensen Anders) ;pers:(Nilsson Peter)"

Sökning: WFRF:(Kristensen Anders) > Nilsson Peter

  • Resultat 1-5 av 5
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1.
  • Kristensen, Fredrik, et al. (författare)
  • A Flexible FFT Processor
  • 2002
  • Konferensbidrag (refereegranskat)abstract
    • In this paper a flexible FFT processor for OFDM systems is presented. In future wireless systems using OFDM each terminal should be able to handle a wide range of different applications, from pure voice communication to high-speed data transfers, with as little overhead in power consumption and protocol procedure as possible. As the terminals will be battery powered and should be cheap to manufacture an ASIC solution is required. To be able to adapt to different communication schemes and various communication channels the FFT processor must be configurable. To minimize power consumption no more precision than necessary should be used. A pipelined radix22 FFT processor, with the possibility of run time switching between 32-1024 points, have been designed in a standard CMOS 0.35 µm technology. Clock gating and low power memories have been used to reduce power consumption.
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2.
  • Kristensen, Fredrik, et al. (författare)
  • A Generic Transmitter for Wireless OFDM Systems
  • 2003
  • Ingår i: 14th IEEE Proceedings on Personal, Indoor and Mobile Radio Communications, 2003. PIMRC 2003.. - 0780378229 ; 3, s. 2234-2238
  • Konferensbidrag (refereegranskat)
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4.
  • Kristensen, Fredrik, et al. (författare)
  • Flexible baseband transmitter for OFDM
  • 2003
  • Ingår i: Proceedings of the IASTED International Conference on Circuits, Signals, and Systems. - 0889863512 ; , s. 356-361
  • Konferensbidrag (refereegranskat)abstract
    • To fully utilize the available spectrum for a wireless communication system it is feasible to adapt to different situations on the channel. In this paper a flexible OFDM transmitter is presented together with basic theory behind OFDM transmission. It is shown that high flexibility can be obtained with a reasonable amount of additional hardware. Part of the design, the FFT-processor, has already been fabricated and measurement results are presented.
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5.
  • Kristensen, Fredrik, et al. (författare)
  • Reduced transceiver-delay for OFDM systems
  • 2004
  • Ingår i: 2004 IEEE 59th Vehicular Technology Conference. VTC 2004-Spring. - 0780382552 ; , s. 1242-1245
  • Konferensbidrag (refereegranskat)abstract
    • 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
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  • Resultat 1-5 av 5
Typ av publikation
konferensbidrag (5)
Typ av innehåll
refereegranskat (4)
övrigt vetenskapligt/konstnärligt (1)
Författare/redaktör
Olsson, Anders (5)
Kristensen, Fredrik (5)
Lärosäte
Lunds universitet (5)
Språk
Engelska (5)
Forskningsämne (UKÄ/SCB)
Teknik (5)

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