NDLI: Joint transmit beamforming and artificial noise design for QoS discrimination inwireless downlink

Content Provider	IEEE Xplore Digital Library
Author	Wei-Cheng Liao Tsung-Hui Chang Wing-Kin Ma Chong-Yung Chi
Copyright Year	2010
Description	Author affiliation: Dept. of Electronic Eng., The Chinese University of Hong Kong, Shatin, N.T., Hong Kong (Wing-Kin Ma) \|\| Institute of Commun. Eng. & Dept. of Elec. Eng., National Tsing Hua University, Hsinchu, Taiwan 30013 (Wei-Cheng Liao; Tsung-Hui Chang; Chong-Yung Chi)
Abstract	This paper considers a downlink wireless system where a multiple-antenna transmitter (Alice) aims to discriminate the reception performances between a legitimate receiver (Bob) and a set of unauthorized receivers (Eves). To this end, there has been great interest in the use of artificial noise (AN) together with transmit beamforming in order to effectively interfere Eves' reception. However, most of the existing works do not optimize the AN but simply allocate it in the left null space of the Alice-to-Bob channel. In the paper, we propose to jointly optimize the beamforming vector and the AN covariance matrix by minimizing the total transmit power subject to a target signal-to-interference-plus-noise ratio (SINR) constraint on Bob and limited SINR constraints on all Eves. While the considered beamforming problem is not convex and may be difficult to solve in general, it can be effectively handled by a convex approximation method called semidefinite program (SDP) relaxation. In addition to showing how SDP relaxation can be applied to this problem, we prove using the KKT optimality that SDP relaxation provides a global optimum solution of the proposed beamforming problem when Alice has perfect information of the channel from Alice to Bob. Simulation results are presented to demonstrate the effectiveness of the proposed beamforming method.
Starting Page	2562
Ending Page	2565
File Size	327283
Page Count	4
File Format	PDF
ISBN	9781424442959
ISSN	15206149
DOI	10.1109/ICASSP.2010.5496291
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-03-14
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Array signal processing Downlink Quality of service Signal to noise ratio Covariance matrix Transmitters Null space Communication system security Councils Relaxation methods secure communications Transmit beamforming QoS discrimination artificial noise SDP relaxation
Content Type	Text
Resource Type	Article

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