Robust Transmit Beamforming With Artificial Redundant Signals for Secure SWIPT System Under Non-Linear EH Model
Robust Transmit Beamforming With Artificial Redundant Signals for Secure SWIPT System Under Non-Linear EH Model
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非线性 EH 模型下安全 SWIPT 系统的鲁棒发射波束成形与人工冗余信号
DOI：
10.1109/twc.2018.2790384
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发表时间：
2018-01
影响因子：
10.4
通讯作者：
Ben Letaief Khaled
中科院分区：
文献类型：
--
作者：
Lu Yang;Xiong Ke;Fan Pingyi;Zhong Zhangdui;Ben Letaief Khaled
研究了非线性能量收集模型下无线信息与能量同步传输系统的安全传输设计问题，其中在存在多个窃听者的情况下，发射机向多个信息接收机和能量收集接收机发送机密信息并传输能量.为了防止机密信息泄漏，在发送信号中嵌入多个人工冗余信号（MARS）。目标是通过联合优化发射波束形成向量和MARS的协方差矩阵来最小化总发射功率，从而在保证IR和ER处的最小信息速率和EH要求的同时，使ER和Eves处的接收信干比低于其信息解码阈值。研究了非稳健设计和稳健设计。对于非稳健设计，导出了最优解。对于稳健设计，利用高斯随机化方法得到了近似最优解。仿真结果表明，与传统的非MARS辅助波束形成设计相比，我们提出的设计是优越的总发射功率方面的上级。它还表明，采用非线性EH模型可以避免ER处的假输出功率和/或节省发射机处的功率。
This paper investigates the secure transmit design for simultaneous wireless information and power transfer system under the non-linear energy harvesting (EH) model, where a transmitter sends confidential information and transfers energy to multiple information receivers (IRs) and EH receivers (ERs) with the existence of multiple eavesdroppers (Eves). To prevent confidential information leakage, multiple artificial redundant signals (MARSs) are embedded in the transmit signals. The goal is to minimize the total transmit power by jointly optimizing transmit beamforming vectors and the covariance matrixes of MARSs, such that the minimal information rate and EH requirements at IRs and ERs are guaranteed while making the received signal-to-Interference ratio at ERs and Eves lower than their information decoding thresholds. Both the non-robust and the robust designs are studied. For the non-robust design, the optimal solution is derived. For the robust design, an approximate optimal solution is obtained by using Gaussian randomization procedure. Simulation results show that compared with traditional non-MARS-aided beamforming design, our proposed design is superior in terms of the total required transmit power. It also shows that employing the non-linear EH model can avoid false output power at the ERs and/or save power at the transmitter.
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