Channel Estimation and ISI/ICI Cancellation for MIMO-OFDM Systems with Insufficient Cyclic Prefix

In multi-input multi-output orthogonal frequency division multiplexing (MIMO-OFDM) systems, the multipath components whose delays exceed cyclic prefix (CP) cause inter-symbol interference (ISI) and inter-carrier interference (ICI), which may degrade system performance severely. In this paper, we propose a joint channel estimation and ISI/ICI cancellation scheme in which a limited CP is used in a trade-off against high-rate performance in MIMO-OFDM systems. A channel estimation scheme based on the criterion of Expectation-Maximization (EM) algorithm can be proposed through the use of a training symbol. The EM algorithm uses an iterative procedure to estimate channel parameters and can estimate channel impulse response (CIR) accurately enough to mitigate ISI/ICI influences. Through the accurate CIR estimation, an efficient method has been developed to counteract ISI/ICI influences in signal detection in the case where the inserted CP length is less than the CIR length. Simulation results show that the proposed method can significantly enhance the overall MIMO-OFDM system performance after only a few iterations.

[1]  Marc Moonen,et al.  Per-tone equalization for MIMO-OFDM systems , 2003, IEEE International Conference on Communications, 2003. ICC '03..

[2]  Zhigang Mao,et al.  Tentative Decision Based Low Complexity Equalization for OFDM Systems with Insufficient Cyclic Prefix , 2005, 2005 5th International Conference on Information Communications & Signal Processing.

[3]  Jiang Yue,et al.  Channel estimation and data detection for MIMO-OFDM systems , 2003, GLOBECOM '03. IEEE Global Telecommunications Conference (IEEE Cat. No.03CH37489).

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

[5]  G. Giannakis,et al.  Wireless Multicarrier Communications where Fourier Meets , 2022 .

[6]  Helmut Bölcskei,et al.  An overview of MIMO communications - a key to gigabit wireless , 2004, Proceedings of the IEEE.

[7]  Shaoping Chen,et al.  ICI and ISI analysis and mitigation for OFDM systems with insufficient cyclic prefix in time-varying channels , 2004, IEEE Trans. Consumer Electron..

[8]  Geoffrey Ye Li,et al.  Broadband MIMO-OFDM wireless communications , 2004, Proceedings of the IEEE.

[9]  Georgios B. Giannakis,et al.  Wireless multicarrier communications , 2000, IEEE Signal Process. Mag..

[10]  Sync TGn.  TGn Sync Proposal Technical Specification , 2004 .

[11]  Werner Henkel,et al.  Maximizing the channel capacity of multicarrier transmission by suitable adaptation of the time-domain equalizer , 2000, IEEE Trans. Commun..

[12]  Reinaldo A. Valenzuela,et al.  V-BLAST: an architecture for realizing very high data rates over the rich-scattering wireless channel , 1998, 1998 URSI International Symposium on Signals, Systems, and Electronics. Conference Proceedings (Cat. No.98EX167).

[13]  Naofal Al-Dhahir,et al.  FIR channel-shortening equalizers for MIMO ISI channels , 2001, IEEE Trans. Commun..