Title :
Relay beamforming strategies for physical-layer security
Author :
Zhang, Junwei ; Gursoy, Mustafa Cenk
Author_Institution :
Dept. of Electr. Eng., Univ. of Nebraska-Lincoln, Lincoln, NE, USA
Abstract :
In this paper, collaborative use of relays to form a beamforming system and provide physical-layer security is investigated. In particular, amplify-and-forward (AF) relay beamforming designs under total and individual relay power constraints are studied with the goal of maximizing the secrecy rates when perfect channel state information (CSI) is available. In the AF scheme, not having analytical solutions for the optimal beamforming design under both total and individual power constraints, an iterative algorithm is proposed to numerically obtain the optimal beamforming structure and maximize the secrecy rates. Robust beamforming designs in the presence of imperfect CSI are investigated for decode-and-forward (DF) based relay beamforming, and optimization frameworks are provided.
Keywords :
Gaussian channels; array signal processing; decoding; iterative methods; optimisation; telecommunication security; Gaussian channel; amplify-and-forward relay beamforming designs; channel state information; decode-and-forward based relay beamforming; iterative algorithm; optimal beamforming design; optimization frameworks; physical-layer security; secrecy rates; Algorithm design and analysis; Array signal processing; Channel state information; Collaboration; Information security; Iterative algorithms; Power system relaying; Power system security; Relays; Robustness; amplify-and-forward relaying; decode-and-forward relaying; physical-layer security; relay beamforming; robust beamforming;
Conference_Titel :
Information Sciences and Systems (CISS), 2010 44th Annual Conference on
Conference_Location :
Princeton, NJ
Print_ISBN :
978-1-4244-7416-5
Electronic_ISBN :
978-1-4244-7417-2
DOI :
10.1109/CISS.2010.5464970
