Iterative Joint Channel Estimation and Signal Detection for OFDM System in Double Selective Channels

Abstract Intercarrier interference caused by fast time-varying multipath fading channels degrades the system performance of high-mobility orthogonal frequency division multiplexing systems. This study considers the challenging problem of joint channel estimation and signal detection in high mobility environments. The estimation method is based on a pilot-aided linear approximation channel modeling and iterative process. After each iteration, the channel estimates are refined with the fed-back detection signal. The channel is re-estimated iteratively, detected increasingly reliable signals. The proposed method is independent of the Doppler-spectrum, delay-profile shape and the number of paths. Numerical simulation results indicate that the proposed method is highly robust to fast time-varying multipath fading channels.

[1]  Donald C. Cox,et al.  ICI mitigation for pilot-aided OFDM mobile systems , 2005, IEEE Transactions on Wireless Communications.

[2]  Yih-Haw Jan Efficient Window-Based Channel Estimation for OFDM System in Multi-Path Fast Time-Varying Channels , 2015, IEICE Trans. Commun..

[3]  Yih-Haw Jan Reduced-Overhead Channel Estimation for OFDM Systems in Multipath Fast Time-Varying Channels , 2015 .

[4]  J. Zhang,et al.  Decision-directed channel estimation based on iterative linear minimum mean square error for orthogonal frequency division multiplexing systems , 2009, IET Commun..

[5]  Daesik Hong,et al.  New OFDM Channel Estimation with Dual-ICI Cancellation in Highly Mobile Channel , 2010, IEEE Transactions on Wireless Communications.

[6]  T. Zemen,et al.  Time-variant channel estimation using discrete prolate spheroidal sequences , 2005, IEEE Transactions on Signal Processing.

[7]  Yih-Haw Jan Transmission Efficient Channel Estimation for OFDM System Under Multi-path Fast Fading Channel , 2015, Wirel. Pers. Commun..

[8]  M Failli Cost 207: Digital Land Mobile Radio Communications , 1989 .

[9]  Philip Schniter,et al.  Low-complexity equalization of OFDM in doubly selective channels , 2004, IEEE Transactions on Signal Processing.

[10]  Laurent Ros,et al.  Polynomial Estimation of Time-Varying Multipath Gains With Intercarrier Interference Mitigation in OFDM Systems , 2009, IEEE Transactions on Vehicular Technology.

[11]  Ye Li,et al.  Bounds on the interchannel interference of OFDM in time-varying impairments , 2001, IEEE Trans. Commun..

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

[13]  L. Ros,et al.  Polynomial estimation of time-varying multipath gains with ICI mitigation in OFDM systems , 2008, 2008 3rd International Symposium on Communications, Control and Signal Processing.