Secrecy capacity enhancement with distributed precoding in multirelay wiretap systems

Long, Hang and Xiang, Wei and Zhang, Yueying and Liu, Yuanan and Wang, Wenbo (2013) Secrecy capacity enhancement with distributed precoding in multirelay wiretap systems. IEEE Transactions on Information Forensics and Security, 8 (1). pp. 229-238. ISSN 1556-6013


The secrecy capacity of relay communications is investigated in this paper, where an eavesdropper is present. Distributed precoding through multiple relay nodes can be used to enhance the received signal power at the destination node and to mitigate the signal leakage to the eavesdropper, simultaneously. Due to individual power constraints at relay nodes, the distributed precoding scalar at each relay node is equivalent to a distributed precoding angle. An iterative algorithm is proposed to find the suboptimum distributed precoding angles at all the relay nodes, where the channel state information (CSI) sharing overhead among the relay nodes can also be substantially reduced. Each relay node receives the equivalent CSI from its preceding relay node, computes its distributed precoding angle, and updates the equivalent CSI for the next relay node. Compared with the simple decode-and-forward relaying protocol with random distributed precoding, the proposed iterative distributed precoding algorithm is able to further improve on the secrecy capacity of the multirelay wiretap system with an acceptable CSI sharing overhead

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2013 IEEE. Published version restricted in accordance with the copyright policy of the publisher.
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - No Department
Date Deposited: 07 Feb 2014 10:50
Last Modified: 19 Nov 2014 04:56
Uncontrolled Keywords: channel state information; cooperative communications; precoding; relay systems; security; algorithms; channel state information; cooperative communication; iterative methods; radio links
Fields of Research : 09 Engineering > 0906 Electrical and Electronic Engineering > 090609 Signal Processing
08 Information and Computing Sciences > 0803 Computer Software > 080303 Computer System Security
Socio-Economic Objective: B Economic Development > 89 Information and Communication Services > 8901 Communication Networks and Services > 890199 Communication Networks and Services not elsewhere classified
Identification Number or DOI: 10.1109/TIFS.2012.2229988

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