Title :
A semi-blind multiuser projection receiver based on conjugate gradient and subspace tracking
Author :
Wu, Qiang ; Li, Chengshu
Author_Institution :
Modern Commun. Res. Inst., Northern Jiaotong Univ., Beijing, China
Abstract :
A semi-blind multiuser projection receiver is proposed. Using interference cancellation of the known users´ signal and subspace tracking for the unknown users´ signal subspace, the orthogonal projection matrix of the unknown users´ signal subspace is obtained. Then, using this matrix, we transform the detection problem of known users´ data into a minimization problem of a quadratic convex function in K variables and solve it using a conjugate gradient (CG) algorithm. The initial estimation of the known users´ data also serves as the initial value of the CG to speed convergence
Keywords :
conjugate gradient methods; convergence of numerical methods; interference suppression; matrix algebra; minimisation; mobile radio; multiuser channels; parameter estimation; radio receivers; signal detection; tracking; base station; conjugate gradient; convergence; known users; minimization; mobile station; multiuser detection; orthogonal projection matrix; quadratic convex function; semi-blind multiuser projection receiver; subspace tracking; unknown users; AWGN; Base stations; Character generation; Convergence; Detectors; Interference cancellation; Minimization methods; Multipath channels; Multiuser detection; Singular value decomposition;
Conference_Titel :
Vehicular Technology Conference, 2001. VTC 2001 Spring. IEEE VTS 53rd
Conference_Location :
Rhodes
Print_ISBN :
0-7803-6728-6
DOI :
10.1109/VETECS.2001.944992
