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arXiv 1806.09421cs.ITmath.IT
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基于NOMA的安全传输波束成形设计与功率分配

Beamforming Design and Power Allocation for Secure Transmission with NOMA

Youhong Feng, Shihao Yan, Zhen Yang, Nan Yang, Jinhong Yuan

摘要:

在这项工作中,我们提出了一种新的波束成形设计,以提高物理层的安全性的非正交多址接入(NOMA)系统的人工噪声(AN)的帮助下。该设计使用两个标量来平衡强用户和弱用户处的有用信号强度和干扰,这是NOMA物理层安全背景下现有波束成形设计的广义版本。我们确定有用信号和AN之间的最佳功率分配以及两个最佳波束形成标量,以最大化保密和速率(SSR)。我们的渐近分析在高信噪比政权提供了一个有效的和接近最佳的解决方案,以优化波束形成标量和功率分配系数。我们的分析表明,它不是最佳的形成一个波束对任何一个强用户或弱用户的NOMA系统的安全增强。此外,渐近最优功率分配通知,随着发射功率的增加,更多的功率应分配给弱用户或AN信号,而分配给强用户的功率保持恒定。我们的研究表明,所提出的新的波束形成设计可以显着优于两个基准计划。

英文摘要:

In this work, we propose a novel beamforming design to enhance physical layer security of a non-orthogonal multiple access (NOMA) system with the aid of artificial noise (AN). The proposed design uses two scalars to balance the useful signal strength and interference at the strong and weak users, which is a generalized version of the existing beamforming designs in the context of physical layer security for NOMA. We determine the optimal power allocation among useful signals and AN together with the two optimal beamforming scalars in order to maximize the secrecy sum rate (SSR). Our asymptotic analysis in the high signal-to-noise ratio regime provides an efficient and near-optimal solution to optimizing the beamforming scalars and power allocation coefficients. Our analysis indicates that it is not optimal to form a beam towards either the strong user or the weak user in NOMA systems for security enhancement. In addition, the asymptotically optimal power allocation informs that, as the transmit power increases, more power should be allocated to the weak user or AN signals, while the power allocated to the strong user keeps constant. Our examination shows that the proposed novel beamforming design can significantly outperform two benchmark schemes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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