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Träfflista för sökning "WAKA:kon ;pers:(Svensson Arne 1955)"

Sökning: WAKA:kon > Svensson Arne 1955

  • Resultat 1-10 av 165
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  • Ahlén, Anders, et al. (författare)
  • Wireless IP - a new PCC project
  • 1999
  • Ingår i: Proc. PCC Workshop, Lund, Sweden. ; , s. 100-101
  • Konferensbidrag (refereegranskat)
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3.
  • Alvarado, Alex, 1982, et al. (författare)
  • On the Capacity of BICM with QAM Constellations
  • 2009
  • Ingår i: Proceedings International Wireless Communications and Mobile Computing Conference, IWCMC'09, Leipzig, Germany [Invited]. - New York, NY, USA : ACM. - 9781605585697 ; , s. 573-579
  • Konferensbidrag (refereegranskat)abstract
    • In this tutorial paper we analyze the capacity of bit-interleaved coded modulation (BICM) with quadrature amplitude modulation (QAM) constellations, and we pay special attention to different bit-to-symbol labeling strategies. The relation between the BICM capacity and the capacity of other CM schemes such as trellis coded modulation (TCM) and multilevel codes (MLC) is analyzed. Motivated by the fact that for BICM with some particular labelings, the same Eb/No maps to more than one BICM capacity value, we study the relation between the capacity and Eb/No. In particular, we present some analytical results on this relation, and we also give an intuitive explanation for the somehow contradictory behavior of these curves.
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4.
  • Alvarado, Alex, 1982, et al. (författare)
  • On the Design of Interleavers for BICM Transmission
  • 2008
  • Ingår i: Proceedings European Wireless Conference 2008, EW2008, Prague, Czech Republic. - 9783800731022
  • Konferensbidrag (refereegranskat)abstract
    • In this paper we design interleavers for bit-interleaved coded modulation (BICM) based on popular convolutional codes and quadrature amplitude modulation with Gray mapping. We analyze the so-called modular interleavers where the outputs of the convolutional encoder are appropriately matched with the input bits of the modulator. To quantify the achievable improvements we develop bounds on the coded BER using themultidimensional weight distribution spectrum of a code together with an equivalent QAM channel model. Based on these bounds, we show that the assignment of the encoder's output to the bit positions in the symbol significantly affects the system performance. The analytical developments are contrasted with numerical simulations. The improvements obtained through the proposed approach do not change the receiver's complexity and, depending on the system's parameters (rate, modulation, code's memory), they may be up to 1.7 dB!
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5.
  • Alvarado, Alex, 1982, et al. (författare)
  • Unequal Error Protection in BICM with QAM Constellations: Interleaver and Code Design
  • 2009
  • Ingår i: IEEE International Conference on Communications. - 1550-3607. - 9781424434350
  • Konferensbidrag (refereegranskat)abstract
    • In this paper we present a general methodology for the interleaver and code design for QAM-based BICM transmissions. We develop analytical bounds on the bit error rate and we use them to predict the performance of BICM when unequal error protection (UEP) is introduced by the constellation labeling. Based on these bounds, the optimum design of interleaver and code is presented. The improvements obtained reached 2~dB for the analyzed cases, and are obtained without complexity increase. Although previous works noted the influence of the interleaver design and the UEP, to the best of our knowledge, this paper is the first to analyze formally this problem for BICM transmissions.
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  • Resultat 1-10 av 165
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Ottosson Gadd, Tony, ... (24)
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Ström, Erik, 1965 (17)
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Lindell, Göran (8)
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