Robust channel estimation for the OFDM-based WLAN systems with imperfect synchronization

As an effective technique for combating multipath fading and for high data rate transmission over wireless channels, orthogonal frequ- ency division multiplexing (OFDM) is extensively used in wireless local area network (WLAN) systems to support high-performance bandwidth- efficient multimedia services. In this paper, a robust channel estimation scheme is proposed for the OFDM-based WLAN systems with imperfect synchronization. The frame structure information, the preamble information, the pilot information are efficiently utilized in the proposed channel estimation scheme. Simulation results are used to illustrate the performance of the proposed scheme.

[1]  S. Kay.  Fundamentals of statistical signal processing: estimation theory , 1993 .

[2]  Umberto Mengali,et al.  A comparison of pilot-aided channel estimation methods for OFDM systems , 2001, IEEE Trans. Signal Process..

[3]  Erik G. Larsson,et al.  Joint symbol timing and channel estimation for OFDM based WLANs , 2001, IEEE Communications Letters.

[4]  Zhixing Yang,et al.  Robust phase noise suppression scheme for TDS-OFDM-based digital television terrestrial broadcasting systems , 2004, IEEE Trans. Consumer Electron..

[5]  J.E. Mazo,et al.  Digital communications , 1985, Proceedings of the IEEE.

[6]  Donald C. Cox,et al.  Robust frequency and timing synchronization for OFDM , 1997, IEEE Trans. Commun..

[7]  Umberto Spagnolini,et al.  Pilot-based channel estimation for OFDM systems by tracking the delay-subspace , 2004, IEEE Transactions on Wireless Communications.

[8]  Zhixing Yang,et al.  Robust Time and Frequency Synchronization for OFDM-Based WLANs , 2005, IEICE Trans. Commun..

[9]  Heinrich Meyr,et al.  Optimum receiver design for OFDM-based broadband transmission .II. A case study , 2001, IEEE Trans. Commun..

[10]  Geoffrey Ye Li,et al.  Robust channel estimation for OFDM systems with rapid dispersive fading channels , 1998, IEEE Trans. Commun..

[11]  Andrzej Milewski,et al.  Periodic Sequences with Optimal Properties for Channel Estimation and Fast Start-Up Equalization , 1983, IBM J. Res. Dev..

[12]  Erchin Serpedin,et al.  A fine blind frequency offset estimator for OFDM/OQAM systems , 2004, IEEE Transactions on Signal Processing.

[13]  Heinrich Meyr,et al.  Optimum receiver design for wireless broad-band systems using OFDM. I , 1999, IEEE Trans. Commun..

[14]  Ramjee Prasad,et al.  OFDM for Wireless Multimedia Communications , 1999 .

[15]  Sinem Coleri Ergen,et al.  Channel estimation techniques based on pilot arrangement in OFDM systems , 2002, IEEE Trans. Broadcast..