A novel approach to space-time-frequency coded MIMO-OFDM over frequency selective fading channels

This paper proposes a space-time-frequency coding scheme for MIMO-OFDM that achieves full rate for an arbitrary number of antennas with complex-valued information symbols. In addition, the proposed scheme provides a very high level of diversity with relatively low complexity. In the new scheme, the spatial and frequency spreading is followed by a temporal spreading that facilitates simple separation of the respective signals sent by the various transmit antennas. This temporal spreading enables perfect separation of the superimposed transmit signals at the receiver prior to channel estimation. The Local Maximum Likelihood (LML) method of Rugini et al is employed to further reduce complexity. Simulations are presented demonstrating the efficacy of the new scheme. For example, for cases where an Orthogonal Space-Time Block (OSTBC) code exists, the new scheme is shown to provide the same full-diversity as the OSTBC. Again, though, the new scheme is applicable for an arbitrary number of transmit antennas and complex-symbol constellations.

[1]  Georgios B. Giannakis,et al.  MMSE-based local ML detection of linearly precoded OFDM signals , 2004, 2004 IEEE International Conference on Communications (IEEE Cat. No.04CH37577).

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

[3]  H. Bölcskei,et al.  MIMO-OFDM wireless systems: basics, perspectives, and challenges , 2006, IEEE Wireless Communications.

[4]  Emanuele Viterbo,et al.  Signal Space Diversity: A Power- and Bandwidth-Efficient Diversity Technique for the Rayleigh Fading Channel , 1998, IEEE Trans. Inf. Theory.

[5]  K. R. Rao,et al.  Orthogonal Transforms for Digital Signal Processing , 1979, IEEE Transactions on Systems, Man and Cybernetics.

[6]  Georgios B. Giannakis,et al.  Linear constellation-precoding for OFDM with maximum multipath diversity and coding gains , 2001, Conference Record of Thirty-Fifth Asilomar Conference on Signals, Systems and Computers (Cat.No.01CH37256).

[7]  Michael D. Zoltowski,et al.  Performance evaluation of Code-Spread OFDM using Vandermonde spreading , 2009, 2009 IEEE Radio and Wireless Symposium.

[8]  D. D. Feder,et al.  Perspectives and Challenges , 1961 .

[9]  Georgios B. Giannakis,et al.  Space-time-frequency coded OFDM over frequency-selective fading channels , 2002, IEEE Trans. Signal Process..