Robust Multicell Downlink Beamforming Based on Second-Order Statistics of Channel State Information

In this paper, we design downlink (DL) beamforming vectors for a multiuser multicell network when only imperfect knowledge of the channel covariance is available at base stations. Specifically, we consider two different models for covariance errors: (a)deterministic error bounded in a spherical regi...

Full description

Saved in:
Bibliographic Details
Published in2011 IEEE Global Telecommunications Conference - GLOBECOM 2011 pp. 1 - 5
Main Authors Ponukumati, D., Feifei Gao, Bode, M.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.12.2011
Subjects
Array signal processing
Downlink
Interference
Optimization
Quality of service
Robustness
Signal to noise ratio
Online AccessGet full text
ISBN9781424492664
1424492661
ISSN1930-529X
DOI10.1109/GLOCOM.2011.6133644

Cover

More Information
Summary:In this paper, we design downlink (DL) beamforming vectors for a multiuser multicell network when only imperfect knowledge of the channel covariance is available at base stations. Specifically, we consider two different models for covariance errors: (a)deterministic error bounded in a spherical region and (b) stochastic error with known probability distribution. Our objective is to minimize the total DL transmit power subject to quality of service (QoS) constraint of every user. It is shown that for both uncertainty models, the optimization can be formulated as a convex semidefinite programming (SDP) problem using the standard rank relaxation approach. Interestingly, numerical results show that the obtained solutions fulfill the rank constraint and are therefore exact.
ISBN:9781424492664
1424492661
ISSN:1930-529X
DOI:10.1109/GLOCOM.2011.6133644