A novel iterative receiver for coded MIMO OFDM systems

We propose a novel iterative receiver for coded multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. Starting from the derivation of the optimal minimum mean squared error (MMSE) estimate of the transmitted data, we show that for BPSK and QPSK modulated signals, the soft estimate is a hyperbolic tangent function of the extrinsic information from the soft-input soft-output (SISO) decoder and the decision statistic from the detector. Compared with the conventional iterative receiver which computes the data estimate using only the decoder output, the proposed structure has significant performance gain, for example, it is 2.0 dB better for groupwise space time block coded (GSTBC) MIMO OFDM system at BER of 10/sup -6/, and 1.5 dB better for vertical Bell Lab layered space-time (VBLAST) OFDM system at BER of 10/sup -5/.

[1]  Mathini Sellathurai,et al.  Turbo-BLAST for wireless communications: theory and experiments , 2002, IEEE Trans. Signal Process..

[2]  Shu Lin,et al.  Error control coding : fundamentals and applications , 1983 .

[3]  Bruno O. Shubert,et al.  Random variables and stochastic processes , 1979 .

[4]  Sumei Sun,et al.  Training sequence assisted channel estimation for MIMO OFDM , 2003, 2003 IEEE Wireless Communications and Networking, 2003. WCNC 2003..

[5]  John G. Proakis,et al.  Digital Communications , 1983 .

[6]  A. Robert Calderbank,et al.  Space-Time Codes for High Data Rate Wireless Communications : Performance criterion and Code Construction , 1998, IEEE Trans. Inf. Theory.

[7]  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.

[8]  Y. Dai,et al.  Ordered maximum SNR array processing for space time coded systems , 2003 .

[9]  Il-Min Kim,et al.  Variable-rate space-time block codes in M-ary PSK systems , 2003, IEEE J. Sel. Areas Commun..

[10]  A. Robert Calderbank,et al.  Combined Array Processing and Space-Time Coding , 1999, IEEE Trans. Inf. Theory.

[11]  H. Vincent Poor,et al.  Iterative multiuser receivers for CDMA channels: an EM-based approach , 1996, IEEE Trans. Commun..

[12]  A. Robert Calderbank,et al.  Space-Time block codes from orthogonal designs , 1999, IEEE Trans. Inf. Theory.

[13]  James R. Zeidler,et al.  Coded error performance of MIMO systems in frequency selective Nakagami fading channels , 2002, 2002 IEEE International Conference on Communications. Conference Proceedings. ICC 2002 (Cat. No.02CH37333).

[14]  Reinaldo A. Valenzuela,et al.  Simplified processing for high spectral efficiency wireless communication employing multi-element arrays , 1999, IEEE J. Sel. Areas Commun..

[15]  Athanasios Papoulis,et al.  Probability, random variables, and stochastic processes , 2002 .

[16]  Siavash M. Alamouti,et al.  A simple transmit diversity technique for wireless communications , 1998, IEEE J. Sel. Areas Commun..

[17]  M. J. Gans,et al.  On Limits of Wireless Communications in a Fading Environment when Using Multiple Antennas , 1998, Wirel. Pers. Commun..

[18]  T. T. Tjhung,et al.  Soft decision-based iterative interference cancellation (IIC) in group-wise STBC (G-STBC) MIMO systems , 2003, The 57th IEEE Semiannual Vehicular Technology Conference, 2003. VTC 2003-Spring..

[19]  Xiaodong Wang,et al.  Iterative receivers for multiuser space-time coding systems , 2000, 2000 IEEE International Conference on Communications. ICC 2000. Global Convergence Through Communications. Conference Record.

[20]  Athanasios Papoulis,et al.  Probability, Random Variables and Stochastic Processes , 1965 .

[21]  Yiyan Wu,et al.  COFDM: an overview , 1995, IEEE Trans. Broadcast..