Iterative Turbo Channel Estimation for OFDM System over Rapid Dispersive Fading Channel

Coherent OFDM detection requires accurate channel state information (CSI). Mobile radio channels are both time and frequency dispersive, especially at high vehicular speeds, which makes channel estimation a challenging problem in system design. Conventional preamble-based and pilot-aided channel estimation require numerous reference signals, which significantly compromises the system throughput. This paper proposes a novel low complexity iterative turbo channel estimation technique which makes use of preamble, pilots and soft decoded data information in an iterative fashion to improve the system performance over the time and frequency selective fading channel while maintaining the system throughput. The numerical and analytical results show that the proposed technique can approach the performance of systems with perfect CSI with much fewer preamble and pilots symbols compared to existing channel estimation methods.

[1]  Jean-Paul M. G. Linnartz,et al.  Iterative interference cancellation and channel estimation for mobile OFDM , 2005, IEEE Transactions on Wireless Communications.

[2]  Jaekyun Moon,et al.  Channel estimation for MIMO-OFDM systems employing spatial multiplexing , 2004, IEEE 60th Vehicular Technology Conference, 2004. VTC2004-Fall. 2004.

[3]  Lin Gui,et al.  Iterative joint channel estimation and signal detection in MIMO OFDM systems , 2005, Proceedings. 2005 International Conference on Wireless Communications, Networking and Mobile Computing, 2005..

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

[5]  Geoffrey Ye Li,et al.  Simplified channel estimation for OFDM systems with multiple transmit antennas , 2002, IEEE Trans. Wirel. Commun..

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

[7]  Yong Soo Cho,et al.  An equalization technique for orthogonal frequency-division multiplexing systems in time-variant multipath channels , 1999, IEEE Trans. Commun..

[8]  Alberto Morello,et al.  CD3-OFDM: a novel demodulation scheme for fixed and mobile receivers , 1996, IEEE Trans. Commun..

[9]  Zixiang Xiong,et al.  EM-based iterative receiver design with carrier-frequency offset estimation for MIMO OFDM systems , 2005, IEEE Trans. Commun..

[10]  Marco Conti,et al.  Metropolitan Area Networks , 1997 .

[11]  Hui Liu,et al.  OFDM-Based Broadband Wireless Networks – Design and Optimization , 2005 .

[12]  Andrew R. Nix,et al.  Data-derived iterative channel estimation with channel tracking for a mobile fourth generation wide area OFDM system , 2003, GLOBECOM '03. IEEE Global Telecommunications Conference (IEEE Cat. No.03CH37489).

[13]  Per Ola Börjesson,et al.  OFDM channel estimation by singular value decomposition , 1996, Proceedings of Vehicular Technology Conference - VTC.

[14]  Geoffrey Ye Li,et al.  MIMO-OFDM for wireless communications: signal detection with enhanced channel estimation , 2002, IEEE Trans. Commun..

[15]  S.K. Wilson,et al.  On channel estimation in OFDM systems , 1995, 1995 IEEE 45th Vehicular Technology Conference. Countdown to the Wireless Twenty-First Century.

[16]  Sirikiat Lek Ariyavisitakul,et al.  Channel estimation for OFDM systems with transmitter diversity in mobile wireless channels , 1999, IEEE J. Sel. Areas Commun..

[17]  Philip Schniter.  Low-complexity estimation of doubly-selective channels , 2003, 2003 4th IEEE Workshop on Signal Processing Advances in Wireless Communications - SPAWC 2003 (IEEE Cat. No.03EX689).

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

[19]  Mark C. Reed,et al.  Iterative Turbo Channel Estimation for OFDM System over Rapid Dispersive Fading Channel , 2007, 2007 IEEE International Conference on Communications.

[20]  Joachim Hagenauer,et al.  The turbo principle-tutorial introduction and state of the art , 1997 .

[21]  Suhas N. Diggavi,et al.  Intercarrier interference in MIMO OFDM , 2002, IEEE Trans. Signal Process..

[22]  Seung Young Park,et al.  Iterative receiver for joint detection and channel estimation in OFDM systems under mobile radio channels , 2004, IEEE Transactions on Vehicular Technology.

[23]  Xiaodong Wang,et al.  Iterative receivers for space-time block-coded OFDM systems in dispersive fading channels , 2002, IEEE Trans. Wirel. Commun..

[24]  W. C. Jakes,et al.  Microwave Mobile Communications , 1974 .

[25]  R. Negi,et al.  Pilot Tone Selection For Channel Estimation In A Mobile Ofdm System * , 1998, International 1998 Conference on Consumer Electronics.