OFDM Interference Mitigation Algorithms for Doubly-Selective Channels

Frequency division multiplexing (OFDM) system may suffer from significant Inter-carrier Interference (ICI) and Inter-block Interference (IBI) under a time- and frequency- selective (or doubly-selective) channel. We propose a novel hybrid architecture where a time-domain FIR filter mitigates IBI by shortening the channel to the cyclic prefix length. This is followed by ICI cancellation in the frequency-domain using few FIR taps per subchannel combined with successive cancellation. We also propose an iterative joint data and channel estimation scheme to improve the channel estimation performance.

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

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

[3]  G.L. Stuber,et al.  Interchannel interference analysis of OFDM in a mobile environment , 1995, 1995 IEEE 45th Vehicular Technology Conference. Countdown to the Wireless Twenty-First Century.

[4]  Charles E. Rohrs,et al.  Impulse response shortening for discrete multitone transceivers , 1996, IEEE Trans. Commun..

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

[6]  Tianren Yao,et al.  Intercarrier interference suppression and channel estimation for OFDM systems in time-varying frequency-selective fading channels , 2004, IEEE Trans. Consumer Electron..

[7]  Gregory J. Pottie,et al.  Robust OFDM in fast fading channels , 2003, GLOBECOM '03. IEEE Global Telecommunications Conference (IEEE Cat. No.03CH37489).

[8]  Georgios B. Giannakis,et al.  Bounding performance and suppressing intercarrier interference in wireless mobile OFDM , 2003, IEEE Trans. Commun..

[9]  Yang-Seok Choi,et al.  On channel estimation and detection for multicarrier signals in fast and selective Rayleigh fading channels , 2001, IEEE Trans. Commun..