Ansari, Imran Shafique
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AbstractThis paper investigates the secrecy performance of a two-user downlink non-orthogonal multiple access systems. Both single-input and single-output and multiple-input and singleoutput systems with different transmit antenna selection (TAS) strategies are considered. Depending on whether the base station has the global channel state information of both the main and wiretap channels, the exact closed-form expressions for the secrecy outage probability (SOP) with suboptimal antenna selection and optimal antenna selection schemes are obtained and compared with the traditional space-time transmission scheme. To obtain further insights, the asymptotic analysis of the SOP in high average channel power gains regime is presented and it is found that the secrecy diversity order for all the TAS schemes with fixed power allocation is zero. Furthermore, an effective power allocation scheme is proposed to obtain the nonzero diversity order with all the TAS schemes. Monte-Carlo simulations are performed to verify the proposed analytical results.
CitationLei H, Zhang J, Park K-H, Xu P, Ansari IS, et al. (2017) On Secure NOMA Systems with Transmit Antenna Selection Schemes. IEEE Access: 1–1. Available: http://dx.doi.org/10.1109/ACCESS.2017.2737330.
SponsorsThis work was supported in part by the National Natural Science Foundation of China (NSFC) under Grant 61471076, Chinese Scholarship Council under Grant 201607845004, the Program for Changjiang Scholars and Innovative Research Team in University under Grant IRT 16R72, the special fund for Key Lab of Chongqing Municipal Education Commission, the Project of Fundamental and Frontier Research Plan of Chongqing under Grant cstc2015jcyjBX0085, cstc2017jcyjAX0204, and the Scientific and Technological Research Program of Chongqing Municipal Education Commission under Grant KJ1600413 and KJ1704088. Parts of this publication were made possible by grant # NPRP7-125-2-061 from the Qatar National Research Fund (QNRF) (a member of Qatar Foundation (QF)). The statements made herein are solely the responsibility of the authors.