Title :
A subspace multiuser beamforming algorithm for downlink in mobile communication systems
Author :
Wang, N.Y. ; Agathoklis, P. ; Antoniou, A.
Author_Institution :
Dept. of Electr. & Comput. Eng., Victoria Univ., BC, Canada
Abstract :
A new technique for downlink multiuser beamforming in mobile communications is described. The optimization problem is reformulated by modifying the constraints so that weight vectors of different mobile stations are optimized in a reduced feasible region that is a subset of the one of the multiuser beamforming problem. Simulation results show that the modified optimization problem leads to solutions that satisfy the signal-to-noise-plus-interference ratio specification at each mobile station and the total power transmitted from the base station is very close to the optimal one. The solution of the modified optimization problem requires significantly less computation than the optimal multiuser beamforming algorithms.
Keywords :
array signal processing; interference (signal); mobile communication; multi-access systems; optimisation; base station; beamforming algorithm; constraint modification; downlink multiuser beamforming; mobile communication system; mobile stations; multiuser beamforming problem; optimal multiuser beamforming; optimization problem reformulation; reduced feasible region; signal-to-noise-plus-interference ratio; subspace multiuser beamforming; transmitted power; weight vectors optimization; Array signal processing; Base stations; Computational complexity; Computational modeling; Constraint optimization; Downlink; Interference; Mobile communication; Power control; Signal to noise ratio;
Conference_Titel :
Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on
Print_ISBN :
0-7803-8251-X
DOI :
10.1109/ISCAS.2004.1328763
