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Träfflista för sökning "WFRF:(Landström Daniel) srt2:(1996)"

Sökning: WFRF:(Landström Daniel) > (1996)

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1.
  • Bengtsson, Daniel, et al. (författare)
  • Trellis coding in a discrete multitone modulation system
  • 1996
  • Ingår i: Proceedings of the 1996 SNRV and NUTEK Conference on Radio Sciences and Telecommunications in Luleå and Kiruna June 3-6, 1996. - Luleå : Luleå tekniska universitet. - 9163044552 ; , s. 668-672
  • Konferensbidrag (refereegranskat)abstract
    • Discrete Multitone (DMT) modulation is a multicarrier technique which makes efficient use of the channel, maximizing the throughput by sending different numbers of bits on different subchannels. The number of bits on each subchannel depends on the Signal-to-Noise Ratio of the subchannel. The performance of a DMT system can be further increased by using powerful coding techniques. This paper investigates an implementation of trellis coded modulation in a DMT system intended for transmission over short copper cables, less than 1000m. We suggested trellis code is Wei's 4-dimensional 16-state coder combined with trellis shaping. A single encoder is used which codes across the tones of each DMT-symbol. At a bit error probability of 10-7, the suggested code gains 4-5 dB over uncoded transmission.
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2.
  • van de Beek, Jaap, et al. (författare)
  • A conceptual study of OFDM-based multiple access schemes : Part 4: Tracking of time and frequency offset
  • 1996
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • This paper is part of a conceptual study of a multiuser OFDM system. In previous reports we have examined requirements for the air interface and presented uncoded performance (in terms of bit error rate) for the uplink of such systems. In this report we adopt the user allocation structure from the previous parts of the study and examine the role of channel coding. We present performance simulations that illustrate the effects of a convolutional code exploiting channel diversity, and channel estimator performance exploiting the channel correlation.
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