An Efficient Scheme to Achieve Differential Unitary Space-Time Modulation on MIMO-OFDM Systems

Differential unitary space-time modulation (DUSTM) has emerged as a promising technique to obtain spatial diversity without intractable channel estimation. This paper presents a study of the application of DUSTM on multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) systems with frequency-selective fading channels. From the view of a correlation analysis between subcarriers of OFDM, we obtain the maximum achievable diversity of DUSTM on MIMO-OFDM systems. Moreover, an efficient implementation strategy based on subcarrier reconstruction is proposed, which transmits all the signals of one signal matrix in one OFDM transmission and performs differential processing between two adjacent OFDM blocks. The proposed method is capable of obtaining both spatial and multipath diversity while reducing the effect of time variation of channels to a minimum. The performance improvement is confirmed by simulation results.

[1]  Thomas L. Marzetta,et al.  Unitary space-time modulation for multiple-antenna communications in Rayleigh flat fading , 2000, IEEE Trans. Inf. Theory.

[2]  W. C. Jakes,et al.  Microwave Mobile Communications , 1974 .

[3]  Yahong Rosa Zheng,et al.  Improved models for the generation of multiple uncorrelated Rayleigh fading waveforms , 2002, IEEE Communications Letters.

[4]  Ran Gozali,et al.  Space-Time Codes for High Data Rate Wireless Communications , 2002 .

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

[6]  Xiaodong Wang,et al.  Space-time code design in OFDM systems , 2000, Globecom '00 - IEEE. Global Telecommunications Conference. Conference Record (Cat. No.00CH37137).

[7]  Hongbin Li Differential space-time-frequency modulation over frequency-selective fading channels , 2003, IEEE Communications Letters.

[8]  Bertrand M. Hochwald,et al.  Differential unitary space-time modulation , 2000, IEEE Trans. Commun..

[9]  Helmut Bölcskei,et al.  Space-frequency coded broadband OFDM systems , 2000, 2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540).

[10]  Kenneth L. Clarkson,et al.  Fast multiple-antenna differential decoding , 2001, IEEE Trans. Commun..

[11]  Thomas L. Marzetta,et al.  Systematic design of unitary space-time constellations , 2000, IEEE Trans. Inf. Theory.

[12]  Qian Ma,et al.  Differential space-time-frequency coded OFDM with maximum multipath diversity , 2005, IEEE Transactions on Wireless Communications.

[13]  Kung Yao,et al.  Differential unitary space-time-frequency coding for MIMO OFDM systems , 2002, Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002..

[14]  Vahid Tarokh,et al.  Space-time coded OFDM for high data-rate wireless communication over wideband channels , 1998, VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151).

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

[16]  Brian L. Hughes,et al.  Differential space-time modulation , 1999, WCNC. 1999 IEEE Wireless Communications and Networking Conference (Cat. No.99TH8466).