Masked Beamforming for Multiuser MIMO Wiretap Channels with Imperfect CSI

Author

Pei, Minyan ; Wei, Jibo ; Wong, Kai-Kit ; Wang, Xin

Author_Institution

Sch. of Electron. Sci. & Eng., Nat. Univ. of Defense Technol., Changsha, China

Volume

11

Issue

2

fYear

2012

fDate

2/1/2012 12:00:00 AM

Firstpage

544

Lastpage

549

Abstract

This letter investigates masked beamforming schemes for multiuser multiple-input multiple-output (MIMO) downlink systems in the presence of an eavesdropper. With noisy and outdated channel state information (CSI) at the base station (BS), we aim to maximize the transmit power of an artificial noise, which is broadcast to jam any potential eavesdropper, while meeting individual minimum mean square error (MMSE) constraints of the desired user links. To this end, we adopt a Bayesian approach and derive an average MSE uplink-downlink duality with imperfect CSI. Using the duality, a robust beamforming algorithm is proposed. Simulation results show the effectiveness of the proposed scheme.

Keywords

MIMO communication; array signal processing; mean square error methods; multiuser channels; MSE uplink-downlink duality; artificial noise; base station; eavesdropper; imperfect channel state information; masked beamforming; minimum mean square error constraints; multiuser MIMO wiretap channels; user links; Array signal processing; Channel estimation; Downlink; MIMO; Noise; Robustness; Vectors; Artificial noise; MIMO broadcast channels; MSE duality; Security; imperfect CSI;

fLanguage

English

Journal_Title

Wireless Communications, IEEE Transactions on

Publisher

ieee

ISSN

1536-1276

Type

jour

DOI

10.1109/TWC.2011.120511.110567

Filename

6101597