Title :
Chance-constrained robust beamforming for multi-cell coordinated downlink
Author :
Chao Shen ; Tsung-Hui Chang ; Kun-Yu Wang ; Zhengding Qiu ; Chong-Yung Chi
Author_Institution :
Inst. of Inf. Sci., Beijing Jiaotong Univ., Beijing, China
Abstract :
This paper considers robust multi-cell coordinated beamforming (MCBF) design for downlink wireless systems, in the presence of channel state information (CSI) errors. By assuming that the CSI errors are complex Gaussian distributed, we formulate a chance-constrained robust MCBF design problem which guarantees that the mobile stations can achieve the desired signal-to-interference-plus-noise ratio (SINR) requirements with a high probability. A convex approximation method, based on semidefinite relaxation and tractable probability approximation formulations, is proposed. The goal is to solve the convex approximation formulation in a distributed manner, with only a small amount of information exchange between base stations. To this end, we develop a distributed implementation by applying a convex optimization method, called weighted variable-penalty alternating direction method of multipliers (WVP-ADMM), which is numerically more stable and can converge faster than the standard ADMM method. Simulation results are presented to examine the chance-constrained robust MCBF design and the proposed distributed implementation algorithm.
Keywords :
Gaussian distribution; array signal processing; convex programming; radio links; radiofrequency interference; wireless channels; CSI error; Gaussian distribution; SINR; WVP-ADMM; base station; chance-constrained robust MCBF design problem; chance-constrained robust beamforming; channel state information; convex approximation method; convex optimization method; mobile station; multicell coordinated downlink; semidefinite relaxation; signal-to-interference-plus-noise ratio; tractable probability approximation formulation; weighted variable-penalty alternating direction method of multipliers; wireless system; Multicell coordinated beamforming; chance constraint; distributed beamforming; outage probability; robust beamforming;
Conference_Titel :
Global Communications Conference (GLOBECOM), 2012 IEEE
Conference_Location :
Anaheim, CA
Print_ISBN :
978-1-4673-0920-2
Electronic_ISBN :
1930-529X
DOI :
10.1109/GLOCOM.2012.6503905