Blind channel estimation in MIMO OFDM systems with multiuser interference

This paper proposes a blind channel estimation method in the context of a multiuser orthogonal-frequency-domain-multiplexing (OFDM) system, where each user transmits utilizing all available subcarriers. A linear nonredundant block precoding scheme is applied at the input of the OFDM system. The precoding spreads the symbols of each user over all subcarriers, thus increasing multipath diversity. At the same time, it introduces a structure to the transmitted symbols, which is exploited at the receiver to estimate the channel in a blind fashion. The proposed channel estimation approach employs computationally simple cross-correlation operations and yields the channel up to a diagonal ambiguity. It does not require channel length information and is not sensitive to additive stationary noise. The precoding does not increase transmission power and maintains even distribution of power between OFDM blocks. A general description of precoding matrices is provided as well as analytical expressions of symbol error probability and signal-to-interference ratio, which could be used to obtain optimum precoding schemes.

[1]  Athina P. Petropulu,et al.  Linear block precoding for blind channel estimation in OFDM systems , 2003, Seventh International Symposium on Signal Processing and Its Applications, 2003. Proceedings..

[2]  Khaled Ben Letaief,et al.  Multiuser OFDM with adaptive subcarrier, bit, and power allocation , 1999, IEEE J. Sel. Areas Commun..

[3]  Shozo Komaki,et al.  Co-channel interference cancellation based on MIMO OFDM systems , 2002, IEEE Wirel. Commun..

[4]  Mohamed-Slim Alouini,et al.  Digital Communication Over Fading Channels: A Unified Approach to Performance Analysis , 2000 .

[5]  See-May Phoong,et al.  BER minimized OFDM systems with channel independent precoders , 2003, IEEE Trans. Signal Process..

[6]  Georgios B. Giannakis,et al.  Space-time diversity systems based on linear constellation precoding , 2003, IEEE Trans. Wirel. Commun..

[7]  Christopher Rose,et al.  Interference avoidance and multiuser MIMO systems , 2003, Int. J. Satell. Commun. Netw..

[8]  Robert W. Heath,et al.  Blind channel identification and equalization in OFDM-based multiantenna systems , 2002, IEEE Trans. Signal Process..

[9]  Athina P. Petropulu,et al.  Linear precoding assisted blind channel estimation for OFDM systems , 2005, IEEE Transactions on Vehicular Technology.

[10]  Xiang-Gen Xia.  Precoded and vector OFDM robust to channel spectral nulls and with reduced cyclic prefix length in single transmit antenna systems , 2001, IEEE Trans. Commun..

[11]  Anna Scaglione,et al.  Transmit antennae space-time block coding for generalized OFDM in the presence of unknown multipath , 2001, IEEE J. Sel. Areas Commun..

[12]  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.

[13]  Robert W. Heath,et al.  Exploiting input cyclostationarity for blind channel identification in OFDM systems , 1999, IEEE Trans. Signal Process..

[14]  Philippe Loubaton,et al.  MMSE analysis of certain large isometric random precoded systems , 2003, IEEE Trans. Inf. Theory.

[15]  Pierre Duhamel,et al.  Subspace-based blind and semi-blind channel estimation for OFDM systems , 2002, IEEE Trans. Signal Process..

[16]  Athina P. Petropulu,et al.  Blind OFDM channel estimation through simple linear precoding , 2004, IEEE Transactions on Wireless Communications.

[17]  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).

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

[19]  Shidong Zhou,et al.  Blind channel estimation algorithm for MIMO-OFDM systems , 2003 .

[20]  Yonghong Zeng,et al.  A semi-blind channel estimation method for multiuser multiantenna OFDM systems , 2004, IEEE Transactions on Signal Processing.

[21]  Athina P. Petropulu,et al.  Frequency domain blind MIMO system identification based on second and higher order statistics , 2001, IEEE Trans. Signal Process..

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

[23]  A.P. Petropulu,et al.  Blind channel equalization in a multiuser OFDM communications system , 2002, Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002..

[24]  Georgios B. Giannakis,et al.  Finite-alphabet based channel estimation for OFDM and related multicarrier systems , 2001, IEEE Trans. Commun..

[25]  K. Abed-Meraim,et al.  Blind source separation using second-order cyclostationary statistics , 2001, 1999 Information, Decision and Control. Data and Information Fusion Symposium, Signal Processing and Communications Symposium and Decision and Control Symposium. Proceedings (Cat. No.99EX251).

[26]  Eric Moulines,et al.  A blind source separation technique using second-order statistics , 1997, IEEE Trans. Signal Process..

[27]  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.

[28]  Ali N. Akansu,et al.  Orthogonal transmultiplexers in communication: a review , 1998, IEEE Trans. Signal Process..

[29]  Youjian Liu,et al.  On the design of space-time and space-frequency codes for MIMO frequency-selective fading channels , 2003, IEEE Trans. Inf. Theory.

[30]  Gregory E. Bottomley,et al.  Jakes fading model revisited , 1993 .

[31]  Georgios B. Giannakis,et al.  Subspace-based (semi-) blind channel estimation for block precoded space-time OFDM , 2002, IEEE Trans. Signal Process..