A group-blind multiuser receiver for MC-CDMA systems

In this paper, a group-blind multiuser receiver is investigated for multicarrier code division multiple access (MC-CDMA) systems. In uplink transmissions, the receiver has the knowledge of the spreading sequences of the users within the cell, while the spreading sequences of the users from other cells are unknown. By imposing linear vector constraints on the multiuser detector, group-blind detection can efficiently suppress the known interferers, while mitigating the unknown interferers based on the minimum mean square error (MMSE) principle. A subspace-based channel estimation algorithm is proposed to blindly estimate the channel information. An adaptive implementation of the group-blind multiuser detection is also developed by using signal and noise subspace tracking algorithms. Numerical results show that the performance of the group-blind detector is much better than the subspace-based linear MMSE detector.

[1]  Peter Strobach,et al.  Bi-iteration SVD subspace tracking algorithms , 1997, IEEE Trans. Signal Process..

[2]  James S. Lehnert,et al.  Subspace MMSE receiver for multicarrier CDMA , 1999, WCNC. 1999 IEEE Wireless Communications and Networking Conference (Cat. No.99TH8466).

[3]  H. Vincent Poor,et al.  Blind Multiuser Detection: A Subspace Approach , 1998, IEEE Trans. Inf. Theory.

[4]  Wei Sun,et al.  Blind channel identification for multicarrier CDMA systems with transmit diversity , 2002, 2002 IEEE International Conference on Communications. Conference Proceedings. ICC 2002 (Cat. No.02CH37333).

[5]  Lóránt Farkas,et al.  Peer-to-peer content sharing in wireless networks , 2004, 2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754).

[6]  Bin Yang,et al.  Projection approximation subspace tracking , 1995, IEEE Trans. Signal Process..

[7]  Peter Strobach.  Square-root QR inverse iteration for tracking the minor subspace , 2000, IEEE Trans. Signal Process..

[8]  Jean-Paul M. G. Linnartz,et al.  Multi-Carrier Cdma In Indoor Wireless Radio Networks , 1994 .

[9]  Ramjee Prasad,et al.  Overview of multicarrier CDMA , 1997, IEEE Commun. Mag..

[10]  G. Golub,et al.  Tracking a few extreme singular values and vectors in signal processing , 1990, Proc. IEEE.

[11]  Xiaodong Wang,et al.  Group-blind multiuser detection for uplink CDMA , 1999, 1999 IEEE 49th Vehicular Technology Conference (Cat. No.99CH36363).