MIMO-OFDM with insufficient cyclic prefix

For orthogonal frequency division multiplexing (OFDM), cyclic prefix (CP) should be longer than the length of channel impulse response, resulting in a loss of bandwidth efficiency. In this letter, the CP reconstruction (CPR) technique is first applied to a multi-input multi-output (MIMO)-OFDM system with insufficient CP. The intercarrier interference (ICI) from multiple transmit antennas is so large for MIMO system that it can not be sufficiently suppressed with the conventional CPR procedure used in single-input single-output (SISO) system. A new minimum mean-square error (MMSE) equalization and ordering process is proposed for MIMO system to suppress the ICI during the CPR procedure. By applying the proposed CPR algorithm to MIMO-OFDM system, we can obtain both the benefits of multiplexing gain and spectral efficiency gain.

[1]  Marc Moonen,et al.  Per-tone equalization for MIMO OFDM systems , 2003, IEEE Trans. Signal Process..

[2]  Gi-Hong Im,et al.  Turbo Layered Space Frequency Coded OFDM for High Speed Wireless Communications , 2005, IEICE Trans. Commun..

[3]  Gi-Hong Im,et al.  Iterative cyclic prefix reconstruction and channel estimation for a STBC OFDM system , 2005, IEEE Communications Letters.

[4]  Gerard J. Foschini,et al.  Layered space-time architecture for wireless communication in a fading environment when using multi-element antennas , 1996, Bell Labs Technical Journal.

[5]  Tamer Kadous.  Ordered H-BLAST for MIMO/OFDM systems over multipath channels , 2003, Proceedings of the Eighth IEEE Symposium on Computers and Communications. ISCC 2003.

[6]  John M. Cioffi,et al.  A data-driven multitone echo canceller , 1994, IEEE Trans. Commun..

[7]  Gi-Hong Im,et al.  Efficient DMT/OFDM transmission with insufficient cyclic prefix , 2004, IEEE Commun. Lett..

[8]  John M. Cioffi,et al.  Precoder for DMT with insufficient cyclic prefix , 1998, ICC '98. 1998 IEEE International Conference on Communications. Conference Record. Affiliated with SUPERCOMM'98 (Cat. No.98CH36220).

[9]  Gi-Hong Im,et al.  Efficient cyclic prefix reconstruction for coded OFDM systems , 2004, IEEE Communications Letters.

[10]  Gordon L. Stüber,et al.  Residual ISI cancellation for OFDM with applications to HDTV broadcasting , 1998, IEEE J. Sel. Areas Commun..