Li Yuan-jie, Yang Lu-xi, He Zhen-ya. A First-Order Statistical Clustering Method for Long-Code MIMO CDMA Blind Channel Estimation[J]. Journal of Electronics & Information Technology, 2007, 29(4): 946-949. doi: 10.3724/SP.J.1146.2005.00712
Citation:
Li Yuan-jie, Yang Lu-xi, He Zhen-ya. A First-Order Statistical Clustering Method for Long-Code MIMO CDMA Blind Channel Estimation[J]. Journal of Electronics & Information Technology, 2007, 29(4): 946-949. doi: 10.3724/SP.J.1146.2005.00712
Li Yuan-jie, Yang Lu-xi, He Zhen-ya. A First-Order Statistical Clustering Method for Long-Code MIMO CDMA Blind Channel Estimation[J]. Journal of Electronics & Information Technology, 2007, 29(4): 946-949. doi: 10.3724/SP.J.1146.2005.00712
Citation:
Li Yuan-jie, Yang Lu-xi, He Zhen-ya. A First-Order Statistical Clustering Method for Long-Code MIMO CDMA Blind Channel Estimation[J]. Journal of Electronics & Information Technology, 2007, 29(4): 946-949. doi: 10.3724/SP.J.1146.2005.00712
A blind channel estimation method is presented for the Multiple-Input-Multiple-Output (MIMO) CDMA system employing long spreading codes. To estimate channel parameters, a decorrelating matched filter is applied as front-end at the receiver. The matched filter outputs consist of the signal space spanned by the users channel vector and the centers of the sets are extracted by clustering procedure. Then the channel parameters are estimated via the first-order statistics of the filter outputs. The K-mean clustering algorithm is improved in class centers initialization for fast convergence. The proposed method has low computational complexity. Simulation results illustrate the effectiveness of the proposed method and the robustness to channel order overestimation.
[1] Ling F. Optimal reception, performance bound, and cutoff rate analysis of reference-assisted coherent CDMA communications with applications [J]. IEEE Trans. on Communications, 1999, COM-47 (10): 1583-1592. [2] Ding Z and Qiu L. Blind MIMO channel identification from second order statistics using rank deficient channel convolution matrix [J].IEEE Trans. on Signal Processing.2003, 51(2):535-544 [3] Zhu J, Cao X, and Liu R. A blind fractionally spaced equalizer using higher order statistics [J].IEEE Trans. on Circuits Syst. II.1999, 46(6):755-764 [4] Hua Y, An S, and Xiang Y. Blind identification of FIR MIMO channels by decorrelating subchannels [J].IEEE Trans. on Signal Processing.2003, 51(5):1143-1155 [5] Xu Z and Tsatsanis M K. Blind channel estimation for long code multiuser CDMA systems [J]. IEEE Trans. on Signal Processing, 2002, SP-48 (4): 988-1001. [6] Tong L, Veen A van der, and Dewilde P, et al.. Blind decorrelating rake receivers for long code WCDMA [J].IEEE Trans. on Signal Processing.2003, 51(6):1642-1655 [7] Liu P and Xu Z. Linear multiuser detection for uplink long-code CDMA systems [C][J].in Proc. IEEE ICASSP03, Hong Kong, Apr.2003, vol. 4:117-120 [8] Akaike H. A new look at the statistical model identification [J]. IEEE Trans. on Automat. Contr., 1974, AC-19(6): 716-723. [9] Rissanen J. Modeling by shortest data description [J].Automatica.1978, vol.14:465-471 [10] Viberg M. Subspace fitting concepts in sensor array processing[D]. Linkoping, Sweden, Linkoping Univ., Oct. 1989. [11] Li Y and Huang X. The generation of independent Rayleigh faders. Proc. IEEE ICC 2000[C]. New Orleans, 2000: 41-45.