Secrecy capacity enhancement with distributed precoding in multirelay wiretap systems

Long, Hang, Xiang, Wei, Zhang, Yueying, 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.

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Abstract

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.

Item ID: 43313
Item Type: Article (Research - C1)
ISSN: 1556-6021
Keywords: channel state information, cooperative communications, precoding, relay systems, security
Funders: National Basic Research Program of China (NBRP), National Key Technology R&D Program of China (NKTP), China Natural Science Funding (NSF)
Projects and Grants: NBRP grant no. 2012CB316005, NKTP grant no. 2012ZX0300400, NSF grant no. 61271183
Date Deposited: 24 Feb 2016 07:47
FoR Codes: 09 ENGINEERING > 0906 Electrical and Electronic Engineering > 090699 Electrical and Electronic Engineering not elsewhere classified @ 100%
SEO Codes: 89 INFORMATION AND COMMUNICATION SERVICES > 8901 Communication Networks and Services > 890199 Communication Networks and Services not elsewhere classified @ 100%
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