Secure Beamforming in Downlink MISO Nonorthogonal Multiple Access Systems

Secure Beamforming in Downlink MISO Nonorthogonal Multiple Access Systems
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下行链路 MISO 非正交多址系统中的安全波束成形

DOI:
10.1109/tvt.2017.2658563
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发表时间:
2017-01
影响因子:
6.8
通讯作者:
Qin Jiayin
Qin Jiayin
中科院分区:
计算机科学2区
文献类型:
--
作者:
Li Yiqing;Jiang Miao;Zhang Qi;Li Quanzhong;Qin Jiayin

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在本文中,我们考虑了蜂窝下行链路多输入单输出(MISO)非正交多址(NOMA)安全传输系统,其中用户被分组为多个集群。每个集群由一个中心用户和一个小区边缘用户组成。中心用户是受委托用户,而小区边缘用户是潜在的窃听者。我们专注于安全波束形成和功率分配的设计优化问题,最大化的总和可实现的保密率的中心用户在基站的发射功率约束和传输速率的要求在小区边缘用户。在所考虑的分数阶二次约束二次规划中,由于优化变量的耦合,问题是非凸的。我们提出了一个交替优化为基础的解决方案和一个约束凹凸过程为基础的解决方案所考虑的问题。仿真结果表明,我们提出的NOMA方案优于传统的正交多址接入方案。
In this paper, we consider a cellular downlink multiple-input-single-output (MISO) nonorthogonal multiple access (NOMA) secure transmission system, where users are grouped as multiple clusters. Each cluster consists of a central user and a cell-edge user. The central user is an entrusted user, and the cell-edge user is a potential eavesdropper. We focus on the secure beamforming and power allocation design optimization problem which maximizes the sum achievable secrecy rate of central users subject to the transmit power constraint at the base station and transmission rate requirements at cell-edge users. The problem is nonconvex because of coupling optimization variables in the considered fractional quadratically constrained quadratic programming. We propose an alternating optimization-based solution and a constrained concave–convex procedure-based solution to the considered problem. Simulation results demonstrate that our proposed NOMA schemes outperform the conventional orthogonal multiple access scheme.
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