Exploiting Secrecy Performance of Uplink NOMA in Cellular Networks
Exploiting Secrecy Performance of Uplink NOMA in Cellular Networks
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DOI：
10.1109/access.2021.3092830
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发表时间：
2021
期刊：
影响因子：
3.9
通讯作者：
M. Nguyen;D. Do;F. Afghah;S. Islam;Anh-Tu Le
中科院分区：
文献类型：
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作者：
M. Nguyen;D. Do;F. Afghah;S. Islam;Anh-Tu Le
研究了存在窃听者的单天线和多天线上行非正交多址（NOMA）保密传输。在蜂窝网络中，用户和基站之间的通信在每个时间框架内需要两个阶段。我们研究了窃听者偷听中继和从用户到基站的直接链接的情况。在安全性能分析方面，我们主要关注两个主要指标，即保密中断概率（SOP）和严格正保密能力（SPSC），并假设窃听者能够检测到信号。导出了SOP和SPSC的解析封闭表达式，用于评价所提方案所达到的系统安全性能。此外，本文还进行了渐近分析，以获得进一步的认识。分析和数值结果表明，只要改善基站信道条件和信噪比，所提方案就能实现更好的保密性能。我们的研究结果证实了两个用户之间存在保密性能差距，因为这两个用户被分配了不同的功率分配因子。
We study the secrecy transmission of uplink non-orthogonal multiple access (NOMA) with single antenna and multi-antenna users in presence of an eavesdropper. Two phases are required for communications during each time frame between the users and the base station in cellular networks. We study the case where an eavesdropper overhears the relay and direct links from the users to the base stations. In terms of the secure performance analysis, we focus on two main metrics including secrecy outage probability (SOP) and strictly positive secrecy capacity (SPSC) with the assumption that the eavesdropper is able to detect the signals. Analytical closed-form expressions for the SOP and SPSC are derived to evaluate the system secure performance achieved by the proposed schemes. Furthermore, the asymptotic analysis is presented to gain further insights. The analytical and numerical results indicate that the proposed schemes can realize better secrecy performance once we improve the channel condition and signal-to-noise ratio (SNR) at the base station. Our results confirms that the secrecy performance gaps exist among the two users since different power allocation factors are assigned to these users.