R. Vallet

Publications (5)3.62 Total impact

• Article: Interleaver design for turbo codes from convergence analysis

  Jungpil Yu, M.-L. Boucheret, R. Vallet, A. Duverdier, G. Mesnager
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  ABSTRACT: In this letter, we present an analysis tool for the convergence of a turbo decoder using the min-sum algorithm. First of all, we classify cycles on a turbo code factor graph. We define and develop a quantity which characterizes the trellis convergence and a probability of a message round on a cycle. Our analysis is then applied to an interleaver design for a turbo decoder using the min-sum algorithm. Since the probability of a message round is closely related to the convergence property, the constructed interleaver optimizes the convergence property. The performance is compared with several referential interleavers.
  IEEE Transactions on Communications 05/2006; · 1.68 Impact Factor
• Article: Interleaver design for serial concatenated convolutional codes

  Jungpil Yu, M.-L. Boucheret, R. Vallet, A. Duverdier, G. Mesnager
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  ABSTRACT: In this paper, we present an interleaver design method for SCCC. Our design criterion is to minimize the message-round probability in the SCCC graph which is specially well suited for SCCC. The message-round probability characterizes the message flow in the SCCC graph. By minimizing it, we can get a large interleaving gain. The simulation results confirm our approach.
  IEEE Communications Letters 09/2004; · 0.98 Impact Factor
• Conference Proceeding: Fixed length analysis of turbo decoder

  J. Yu, M.-L. Boucheret, R. Vallet, G. Mesnager, A. Duverdier
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  ABSTRACT: We propose an approach based on a message circulation concept for the convergence analysis of the turbo decoder. We define an interleaver ensemble as a set of all possible interleavers and a k-segment cycle in a given interleaver. Then a message-round probability on a k-segment cycle is derived on an interleaver ensemble. The result is very suggestive and allows the quantitative explanation of the convergence rate.
  Signal Processing Advances in Wireless Communications, 2003. SPAWC 2003. 4th IEEE Workshop on; 07/2003
• Article: Interleaver parameter-selecting strategy for DVB-RCS turbo codes

  J. Yu, M.-L. Boucheret, R. Vallet, G. Mesnager
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  ABSTRACT: Turbo codes are at present standardised for digital video broadcasting (DVB-RCS) where interleavers are defined with four parameters. A new parameter-selecting strategy is introduced to improve DVB-RCS turbo codes. The performance of DVB-RCS standard codes is compared with that of turbo codes having the newly selected parameters. Computer simulations show the improvement of turbo codes with the new interleaver parameters
  Electronics Letters 08/2002; · 0.96 Impact Factor
• Conference Proceeding: Design of turbo codes interleaver by loop distributions

  Jungpil Yu, M.-L. Boucheret, R. Vallet
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  ABSTRACT: Interleavers play an essential role in turbo codes performance. In this paper, we present one of the interleaver construction algorithms which is based on the loop distribution of the interleaver.
  Information Theory, 2002. Proceedings. 2002 IEEE International Symposium on; 02/2002