Long, Hang, Xiang, Wei, Wang, Jing, Zhang, Xiaoli, and Wang, Wenbo (2015) Enhancing secrecy capacity of multi-relay wiretap systems with partial channel state information. International Journal of Communications Systems, 28 (12). pp. 1847-1861.

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Abstract

Distributed precoding has provento be capable of enhancing the secrecy capacity of the multi-relay wiretap system. An iterative distributed precoding and channel state information (CSI) sharing scheme can be used to reduce the CSI overhead at each relay node. However, in practical applications, the CSI of each relay node cannot be perfectly known to themselves, especially that of the relay-eavesdropper channels. Thus, partial CSI for the relay-eavesdropper links is assumed, and the corresponding distributed precoding and CSI sharing schemes are investigated. Under the assumption that the average value of the relay-eavesdropper channel is known at each relay node, an extended iterative distributed precoding and CSI sharing scheme is proposed. Simulation results demonstrate that with the increase of the power ratio of the constant part to the random part of the relay-eavesdropper channels, the proposed scheme with partial CSI performs increasingly close to the one with perfect CSI in secrecy capacity.

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