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LDPC-based space-time coded OFDM systems: Turbo-EM receiver design with channel state information guessing algorithms

Systèmes OFDM Utilisant des Codes LDPC: Récepteur Turbo-EM et Algorithmes D’Apprentissage du Canal de Propagation

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Abstract

In this paper we study some turbo receiver architectures employing low-density parity check (Ldpc) codes together with orthogonal frequency division multiplexing (Ofdm) for high data rate wireless transmissions. Different demodulation schemes based on expectation-maximization (Em) algorithm are studied along with the channel impulse response (Em) algorithms. We studied differentCir guessing algorithms including the EM-based algorithms such as a space-alternating generalized expectation-maximization algorithm (Sage). It is shown that the proposed turbo-Em receiver employing a soft maximum a posteriori (Map)Em demodulator and a belief propagationLdpc decoder can perform within 1 dB from the ergodic capacity of the studiedMimo ofdm channels. Besides, we find that a suboptimum structure based on a soft interference cancellationMmse filtering demodulator exhibits negligible loss in non-correlated fadingMimo channels but suffer extra performance loss in highly correlatedMimo channels.

Résumé

Dans cet article, nous étudions les performances de récepteurs de type turbo utilisant des codesLdpc dans le contexte de transmissions hauts débits enOfdm. Différents types de démodulateurs utilisant l’algorithmeEm sont présentés ainsi que divers algorithmes d’apprentissage du canal de propagation toujours basés sur I’Em. En particulier nous proposons une variante de l’algorithmeEm baptiséeSage Space-Alternating Generalized Expectation-Maximization algorithm. Nous montrons alors que le récepteur turboMap-em combiné avec un codeurLdpc permet de travailler à 1 dB de la capacité ergodique du canal lorsque le canal est parfaitement estimé. De plus, nous montrons qu ’une structure sous-optimale utilisant un annuleur d’interférences avec un filtrage des moindres carrés présente des pertes négligeables dans le cas de canaux indépendants mais est plus sensible que la structureMap-em à la présence de canaux fortement corrélés.

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References

  1. Foschini (J. G.), “Layered space-time architecture for wireless communication in a fading environment when using multi element antennas”,Bell Labs Tech. J.,2, pp. 41–59, Autumn 96.

  2. Golden (G. D.),Foschini (J. G.),Valenzuela (R. A.),Wolniansky (P. W.), “Detection algorithm and initial laboratory results using v-blast space-time communication architecture”,Electron. Lett.,35, pp. 14–15, Jan. 99.

  3. Hassibi (B.), “An efficient square-root algorithm forBlast”, in Proc.Ieee Int. Conf. Acoust., Speech, Signal Process., Istanbul, Turkey, June 5–9, 2000, pp. 737–740.

  4. Choi (W. J.),Negi (R.),Cioffi (J. M.), “CombinedMl andDfe decoding for theV-blast system”, in Proc.Ieee Int. Conf. Commun., June 18–22, 2000, pp. 1243–1248.

  5. Li (X.),Huang (H.),Foschini (G. J.),Valenzuela (R. A.), “Effects of iterative detection and decoding on the performance ofBlast”, in Proc.Ieee Globecom, San Francisco, CA, 2000, pp. 1061–1066.

  6. Sellathurai (M.), Haykin (S.), “Turbo-blast for Wireless Communications: Theory and Experiments”,Ieee Trans. on Sig. Process,50, no 10, pp. 2538–2546, Oct. 2002.

    Article  Google Scholar 

  7. Bender (P.), Black (P.), Grob (M.), Padovani (R.), Sindhushyana (N.), Viterbi (S.), “Cdma/hdr: A bandwidth efficient high speed wireless data service for nomadic users”,Ieee Commun. Mag.,38, pp. 70–77, July 2000.

    Article  Google Scholar 

  8. Mackay (D. J. C),Neal (R. M.), “Near Shannon limit performance of low density parity check codes”,Electron. Lett., 33, pp. 457–458, Mar. 97.

  9. Lu (B.), Wang (X.), Narayanan (K. R.), “Ldpc-based space-time codedOfdm systems over correlated fading channels”,Ieee Trans. on Comm.,50, no 1, pp. 74–88, Jan. 2002.

    Article  Google Scholar 

  10. Telatar (I. E.), “Capacity of multi-antenna Gaussian channels”,Eur. Trans. Telecommun., 10, pp. 585–595, Nov-Dec 99.

  11. Foschini (G. J.),Gans (M. J.), “On limits of wireless communications in a fading environment when using multiple antennas”,Wireless Pers, Commun., 6, pp. 311–315, Mar. 98.

  12. Wang (X.),Poor (H. V.), “Iterative (Turbo) soft interference cancelation and decoding for codedCdma”,IEEE Trans. on Comm.,47, no 7, pp. 1046–1061, July 99.

  13. Georghiades (C. N.),Han (J. C), “Sequence estimation in the presence of random parameters via the EM algorithm”,IEEE Trans. on Comm.,45, no 3, pp. 300–308, March 97.

  14. Li (Y.),Seshadri (N.),Ariyavisitakul (L.), “Channel estimation forOfdm systems with transmitter diversity in mobile wqireless channel”,Ieee J. Select. Areas Commun.,17, pp. 461–471, Mar. 99.

  15. Li (Y.), “Optimum training sequences forOfdm systems with multiple transmit antennas”, in Proc.Ieee Globecom, San Francisco, CA, 2000, pp. 147872-1482.

  16. Fessler (J. A.),Hero (A. O.), “Space-alternating generalized expectation maximization algorithm”,Ieee Trans. on Sig. Process,42, no 10, pp. 2664–2677, Oct. 94.

  17. Bolcskei (H.), Gesbert (D.), Paulraj (A. J.), “On the capacity ofOfdm-based spatial multiplexing systems”,Ieee Trans. on Comm.,50, no 2, pp. 225–234, Feb. 2002.

    Article  Google Scholar 

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Authors and Affiliations

  1. Groupe d’Étude des Systèmes de Télécommunications de I’ensil (UMOP/GESTE CNRS FRE 2701), Université de Limoges — École Nationale Supérieure d’Ingénieurs de Limoges (ENSIL), 16, Rue Atlantis, Parc ester, BP 6804, 87068, Limoges cedex, France

    Guillaume Ferré, Mohamad Jamalullil Syed, Jean-Pierre Cances, Vahid Meghdadi & Jean-Michel Dumas

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  1. Guillaume Ferré
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  2. Mohamad Jamalullil Syed
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  3. Jean-Pierre Cances
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  4. Vahid Meghdadi
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  5. Jean-Michel Dumas
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Additional information

Guillaume Ferré is graduated in electrical engineering fromEnsil in 2003, he is now working towards the PhD at the University of Limoges.

Mohamad Jamalullil Syed is graduated in electrical engineering from ensil in 2001. He is now working towards the Ph.D at the University of Limoges. His current research activity includes multiuserMimo ofdm system withLdpc channel coding. His research activities are sponsored by Telekom Malaysia Berhad.

Jean-Pierre Cances is graduated in electrical engineering fromEnst Bretagne in 1990. He received his Ph.D degree from Télécom Paris in satellite communication engineering in 1993. He is now an assistant professor at the Ecole Nationale Supérieure d’Ingénieurs de Limoges (Ensil). His current research interests include satellite communication systems, multicarrier detection and synchronization algorithms,Mimo communication systems.

Vahid Meghdadi received hisBsc andMsc. degrees in communication engineering from Sharif University of Technology, Tehran, Iran, respectively in 1989 and 1992. He worked as a lecturer in Mashhad University in 1993. Since 1994, he has been a Ph.D. student inEcole nationale Supérieure d’Ingenieurs de Limoges (Ensil) where he is now an assistant professor. His current research interests include satellite communication systems, multiuserdetection and synchronization algorithms,Mimo communication systems.

Jean-Michel Dumas received his Diplôme d’Ingénieur from the Institut National des Sciences Appliquées of Toulouse, in 1973 and the Doctorat ès-Sciences Physiques degree from the University of Limoges in 1985. He was a member of the technical staff of France Télécom/Centre National d’Etudes des Télécommunications (Cnet) in Lannion till 1994. Then, he joined the Ecole Nationale Supérieure d’Ingénieurs de Limoges (Ensil), University of Limoges, as Professor of Electronics and Telecommunications. At ensil, he leads a research group involved in the characterization of optoelectronic devices and the simulation of digital communication systems.

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Ferré, G., Syed, M.J., Cances, JP. et al. LDPC-based space-time coded OFDM systems: Turbo-EM receiver design with channel state information guessing algorithms. Ann. Télécommun. 60, 770–796 (2005). https://doi.org/10.1007/BF03219946

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  • DOI: https://doi.org/10.1007/BF03219946

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