Title :
Robust SINR-constrained MISO downlink beamforming: When is semidefinite programming relaxation tight?
Author :
Song, Enbin ; Shi, Qingjiang ; Sanjabi, Maziar ; Sun, Ruoyu ; Luo, Zhi-Quan
Author_Institution :
Coll. of Math., Sichuan Univ., Chengdu, China
Abstract :
We consider the robust beamforming problem under imperfect channel state information (CSI) subject to SINR constraints in a downlink multiuser MISO system. One popular approach to solve this nonconvex optimization problem is via semidefinite relaxation (SDR). In this paper, we prove that the SDR method is tight when the channel uncertainty bound is small or when the base station is equipped with two antennas.
Keywords :
antennas; array signal processing; concave programming; multi-access systems; radio links; relaxation theory; wireless channels; SDR method; antenna; base station; channel state information; channel uncertainty bound; downlink multiuser MISO system; nonconvex optimization problem; robust SINR-constrained MISO downlink beamforming; robust beamforming problem; semidefinite programming relaxation; Array signal processing; Downlink; Interference; Quality of service; Robustness; Signal to noise ratio; Uncertainty; Robust beamforming; SDR; SINR; channel uncertainty;
Conference_Titel :
Acoustics, Speech and Signal Processing (ICASSP), 2011 IEEE International Conference on
Conference_Location :
Prague
Print_ISBN :
978-1-4577-0538-0
Electronic_ISBN :
1520-6149
DOI :
10.1109/ICASSP.2011.5946350
