Improving the Security of Cooperative Relaying Networks with Multiple Antennas

Yuzhen Huang, Caijun Zhong, Quang Duong, Jinlong Wang, Qihui Wu, George K. Karagiannidis

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)


In this paper, we investigate the secrecy performance of dual-hop amplify-and-forward (AF) multi-antenna relaying systems over Rayleigh fading channels by taking into account the direct link between the source and destination. To improve the secrecy performance, two linear processing schemes at relay and maximal ratio combining (MRC) at destination are proposed, namely, Zero-forcing/MRC (ZF/MRC) and Maximal ratio transmission/MRC (MRT/MRC). For these schemes, we present new tight analytical expressions of the secrecy outage probability. In addition, we examine the performance in high signal-to-noise ratio (SNR) regimes, and present simple secrecy outage approximations for all schemes. The results reveal that: 1) The MRT/MRC scheme achieves a full diversity order of M+1, while the ZF/MRC scheme achieves a diversity order of M, where M is the number of antennas at relay. 2) The ZF/MRC scheme outperforms the MRT/MRC scheme in the low SNR regime, while becomes inferior to the MRT/MRC scheme in the high SNR regime.
Original languageEnglish
Title of host publicationIEEE 83rd Vehicular Technology Conference (VTC Spring 2016)
Place of PublicationNanjing, China
Publisher IEEE
ISBN (Electronic)978-1-5090-1699-0
ISBN (Print)978-1-5090-1698-3
Publication statusPublished - 07 Jul 2016

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