Browse > Article

Viterbi Decoder-Aided Equalization and Sampling Clock Recovery for OFDM WLAN  

Kim Hyungwoo (Kyungpook National University)
Lim Chaehyun (Kyungpook National University)
Han Dongseog (Kyungpook National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.42, no.5, 2005 , pp. 13-22 More about this Journal
Abstract
IEEE 802.11a is a standard for the high-speed wireless local area network (WLAN), supporting from 6 up to 54 Mbps in a 5 GHz band. We propose a channel equalization algerian and a sampling clock recovery algorithm by utilizing the Viterbi decoder output of the IEEE 802.11a WLAN standard. The proposed channel equalizer adaptively compensates channel variations. The proposed system uses re-encoded Viterbi decoder outputs as reference symbols for the adaptation of the channel equalizer. It also extracts sampling phase information with the Viterbi decoder outputs for fine adjustment of the sampling clock. The proposed sampling clock recovery and equalizer are more robust to noise and frequency selective fading environments than conventional systems using only four pilot samples.
Keywords
OFDM; WLAN; Equalization; Sampling clock recovery;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Y. J. Ryu and D. S. Han, 'Timing Phase Estimator Overcoming Rayleigh Fading Channel for OFDM Systems,' IEEE Trans. on Consumer Electronics, vol.47, pp. 370-377, Aug. 2001   DOI   ScienceOn
2 ETSI EP BRAN, Channel Models for HIPERLAN/2 in Different Indoor Scenarios, Mar. 1998
3 J. J. van de Beek, P. O. Borjesson, M. L. Boucheret, D. Landstrom, J. M. Arenas, P.Odling, C. Ostberg, M. Wahlqvist and S. K. Wilson, 'A Time and Frequency Synchronization Scheme for Multiuser OFDM,' IEEE J. Select Areas Commun, vol. 17, pp.1900-1914, Nov. 1999   DOI   ScienceOn
4 J. Hagenauer, E. Offer and L. Papke, 'Iterative Decoding of Binary Block and Convolutional Codes,' in Proc. GLOBECOM'92, vol.3, pp.1779-1784, Dec. 1992
5 M. Tuchler, R. Otnes and A. Schmidbauer, 'Performance of Soft Iterative Channel Estimation in Turbo Equalization,' in Proc. ICCS2002, vol.1, pp.72-76, Nov. 2002   DOI
6 Y. J. Ryu and D. S. Han, 'Timing Phase Estimator Overcoming Rayleigh Fading Channel for OFDM Systems,' IEEE Trans. on Consumer Electronics, vol.47, pp. 370-377, Aug. 2001   DOI   ScienceOn
7 D. K. Kim, S. H. Do, H.B. Cho, H.J. Choi and K.B. Kim, 'A New Joint Algorithm of Symbol Timing Recovery and Sampling Clock Adjustment for OFDM Systems,' IEEE Trans.on Consumer Electronics, vol.44, pp.1142-1149, Aug.1998   DOI   ScienceOn
8 F. M. Gardner, Phaselock Techniques, John Wiley & Sons, New York, 2ed, 1979
9 M. Sprth, S. Fechtel, G. Fock and H. Meyr, 'Optimum Receiver design for OFDM-Based Broadband Transmission-Part II: A Case Study,' IEEE Trans. on Commum. vol. 49, pp.571-578, Apr. 2001   DOI   ScienceOn
10 S. A. Fechtel, 'OFDM Carrier and Sampling Frequency Synchronization and its Performance on Stationary and Mobile Channels,' IEEE Trans. on Consumer Electronics, vol. 46, pp.438-441, Aug.2000   DOI   ScienceOn
11 W. Y. Zou and Y. Wu, 'COFDM: an Overview,' IEEE Trans. on Broadcasting, vol.41, pp.1-8 Mar.1995   DOI   ScienceOn
12 A. J. Viterbi, 'Error Bounds for Convolutional codes and an Asymptotically Optimum Decoding Algorithm,' IEEE Trans. on Information Theory, vol.13, pp.260-269, Apr.1967   DOI   ScienceOn
13 J. Terry and J. Heiskala, OFDM Wirelese LANs: A Theoretical and Practical Guide, Sams, Indianapolis, 2002
14 IEEE standard 802.11a, Supplement to IEEE Standard for Information Technology between Systems - Local and Metropolitan Area Networks-Specific Requirements Part II: Wireless LAN Medium Access control(MAC) and physical Layer (PHY), Sep.1999
15 J. A. C.Bingham, 'Multicarrier Modulation for Data Trasmision: An Idea Whose Time Has Come,' IEEE Comm. Mag., vol. 28, pp. 5-15, May 1990   DOI   ScienceOn