World Academy of Science, Engineering and Technology
Published June 28, 2010 | Version 14664
Journal article Open

Code-Aided Turbo Channel Estimation for OFDM Systems with NB-LDPC Codes

Description

In this paper channel estimation techniques are considered as the support methods for OFDM transmission systems based on Non Binary LDPC (Low Density Parity Check) codes. Standard frequency domain pilot aided LS (Least Squares) and LMMSE (Linear Minimum Mean Square Error) estimators are investigated. Furthermore, an iterative algorithm is proposed as a solution exploiting the NB-LDPC channel decoder to improve the performance of the LMMSE estimator. Simulation results of signals transmitted through fading mobile channels are presented to compare the performance of the proposed channel estimators.

Files

14664.pdf

Files (338.7 kB)

Name Size
md5:c669dd6e4d9f2366cb25498cb708b162
338.7 kB Preview Download

Additional details

References

  • LTE Document, "3GPP; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation (Release 8)", 3GPP TS 36.211 V8.5.0 (2008-12).
  • M. Davey and D. MacKay, "Low density parity check codes over GF(q)," IEEE Commun. Lett., vol. 2, no. 6, pp. 165-167, June 1998.
  • C. Douillard, M. Jézéquel, C. Berrou, A. Picart, P. Didier, A. Glavieux, "Iterative correction of intersymbol interference: Turbo-equalization," Eur. Trans. Commun., vol. 6, no. 5, pp. 507-511, Sept.-Oct. 1995.
  • M. Valenti and B. Woerner, "Iterative channel estimation and decoding of pilot symbol assisted turbo codes over flat-fading channels," IEEE Select. Areas Commun., vol. 19, no. 9, pp. 1697-1705, Sept. 2001.
  • M. Flanagan and A. Fagan, "Iterative channel estimation, equalization, and decoding for pilot-symbol assisted modulation over frequency selective fast fading channels," IEEE Trans. Veh. Technol., vol. 56, no. 4, pp. 1661-1670, July 2007.
  • X. Nguyen and J. Choi, "Iterative channel estimation and turbo decoding in OFDM systems," in Proc. IEEE Veh. Technol. Conf.-Fall, Dallas, TX, pp. 166-170, Sept. 2005.
  • Y.-N. Lee, A. Ashikhmin, and J.-T. Chen, "Impact of soft channel construction on iterative channel estimation and data decoding for multicarrier systems," IEEE Trans. Wireless Commun., vol. 7, no. 7, pp. 2762-2760, July 2008.
  • R. Otnes and M. T├╝chler, "Iterative channel estimation for turbo equalization of time-varying frequency-selective channels," IEEE Trans. Wireless Commun., vol. 3, no. 6, pp. 1918-1923, Nov. 2004.
  • A. Voicila, D. Declercq, F. Verdier, M. Fossorier, P. Urard, "Lowcomplexity, low-memory EMS algorithm for non-binary LDPC codes," in Proc. IEEE Int. Conf. Commun. (ICC), Glasgow, UK, June 2007, pp. 671-676. [10] M. S. Akram, "Pilot-based Channel Estimation in OFDM Systems," Master Thesis, Nokia Mobile Phones, 2007. [11] W. Zhou, W. H. Lam, "A Fast LMMSE Channel Estimation Method for OFDM Systems," Department of Electrical and Electronics Engineering, The University of Hong Kong, Hong Kong, 2009. [12] Henryk Gierszal, Witold Ho┼éubowicz, Łukasz Kiedrowski, Adam Flizikowski, "Non-Binary LDPC Coding for IMT-Advanced System," 4th International Conference on Broadband Communication, Information Technology & Biomedical Applications, BroadBandCom'09, 15-18 July 2009, Wroc┼éaw, ID 197 [13] "IEEE 802.16m Evaluation Methodology Document (EMD)," 2008-07- 03.