Global Energy Efficiency in Secure MISO SWIPT Systems With Non-Linear Power-Splitting EH Model
Global Energy Efficiency in Secure MISO SWIPT Systems With Non-Linear Power-Splitting EH Model
复制标题
具有非线性功率分配 EH 模型的安全 MISO SWIPT 系统的全球能源效率
DOI：
10.1109/jsac.2018.2872369
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发表时间：
2019
影响因子：
16.4
通讯作者：
Ben Letaief Khaled
中科院分区：
文献类型：
--
作者：
Lu Yang;Xiong Ke;Fan Pingyi;Ding Zhiguo;Zhong Zhangdui;Ben Letaief Khaled
本文考虑了一个MISO同时无线信息和功率传输（SWIPT）系统，其中一个发射机服务于多个授权的接收机中存在几个潜在的窃听者（空闲接收机）。为了防止信息被窃听者截获，人工噪声（AN）被嵌入到发送信号中。采用非线性能量收集模型，提出了一种新的功率分离能量收集接收机结构。随机不确定性信道模型（SUM）被认为是由于过时的信道反馈的空闲接收机。在授权接收机的最小速率和安全传输约束、空闲接收机的EH要求约束和发射机处的总可用功率约束下，通过联合优化发射波束成形向量、AN协方差矩阵和PS比来制定全局能量效率（GEE）最大化问题。由于问题是非凸的，没有已知的解决方案，它是基于以下解决方案框架解决的。首先利用二分法和逐次凸逼近（SCA）优化PS比，然后利用基于Dinkelbach算法的方法联合优化发射波束形成向量和AN协方差矩阵，其中SCA用于求解其内部子问题。从理论上证明，通过引入AN，系统GEE可以得到改善。大量的结果表明，系统GEE随总可用功率的增加先增加后保持不变，而随最小速率需求的增加先保持不变后减小。与传统EH接收机结构和线性EH模型相比，本文提出的PS EH接收机结构能够获得更高的GEE，并避免空闲接收机的虚假输出功率。
This paper considers an MISO simultaneous wireless information and power transfer (SWIPT) system, where one transmitter serves multiple authorized receivers in the presence of several potential eavesdroppers (idle receivers). To prevent the information interception by eavesdroppers, artificial noise (AN) is embedded into the transmit signals. The non-linear energy harvesting (EH) model is adopted and a novel power-splitting (PS) EH receiver architecture is proposed. Stochastic uncertainty channel model (SUM) is considered for the idle receivers due to outdated channel feedback. A global energy efficiency (GEE) maximization problem is formulated by jointly optimizing the transmit beamforming vectors, the AN covariance matrix, and the PS ratios, under the minimal rate and secure transmission constraints of authorized receivers, the EH requirement constraints of idle receivers, and the total available power constraint at the transmitter. Since the problem is non-convex with no known solution, it is solved based on the following solution framework. Firstly, the PS ratios are optimized by using the bisection method and successive convex approximation (SCA), and then, the transmit beamforming vectors and the AN covariance matrix are jointly optimized by using a Dinkelbach’s Algorithm based method, where SCA is applied to solve its inner subproblem. It is theoretically proved that by involving AN, the system GEE can be improved. Numerous results show that system GEE first increases and then keeps unchanged with the increment of the total available power, but it first keeps unchanged and then decreases with the increment of the minimal rate requirement. It is also observed that compared with traditional EH receiver architecture and linear EH model, our proposed PS EH receiver architecture is able to achieve higher GEE and avoid false output power at idle receivers.
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影响因子：
5.4
作者：
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通讯作者：
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影响因子：
16.4
作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
10.4
作者：
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影响因子：
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作者：
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