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Secure analysis on artificial-noise-aided simultaneous wireless information and power transfer systems

Frontiers of Information Technology & Electronic Engineering 2020年第11期21卷 1651-1660页

作者： Wei-min HOU Qing-shan TANG School of Information Science and Engineering Hebei University of Science and TechnologyShijiazhuang 050018China School of Physics Electronic Science Changsha University of Science Sz TechnologyChangsha 410114China

In this paper,we investigate the secrecy outage performance in simultaneous wireless information and power transfer(SWIPT)systems taking artificial noise assistance into account.Multiple antennas in the source and a single antenna in both the legitimate receiver and the eavesdropper are assumed.Specifically,the transmitted signal at the source is composed of two parts,where the first part is the information symbols and the other is the noise for the eavesdropper.To avoid making noise in the legitimate receiver,these two parts in the transmitted signals are modulated into two orthogonal dimensions according to the instantaneous channel state between the source and the legitimate receiver.We derive an approximate closed-form expression for the secrecy outage probability(SOP)by adopting the Gauss-Laguerre quadrature(GLQ)method,where the gap between the exact SOP and our approximate SOP converges with increase of the summation terms in the GLQ.To obtain the secrecy diversity order and secrecy array gain for the considered SWIPT system,the asymptotic result of the SOP is also derived.This is tight in the high signal-to-noise ratio region.A novel and robust SOP approximation is also analyzed given a small variance of the signal-to-interference-plus-noise ratio at the eavesdropper.Some selected Monte-Carlo numerical results are presented to validate the correctness of the derived closed-form expressions.

关键词： artificial noise Multi-antenna systems Secrecy outage probability Simultaneous wireless information and power transfer

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Two-step transmission with artificial noise for secure wireless SIMO communications

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Science China(Information Sciences) 2015年第4期58卷 115-127页

作者： WANG Bo MU PengCheng YANG PeiZhi YIN QinYe Ministry of Education Key Lab for Intelligent Networks and Network Security School of Electronic and Information Engineering Xi’an Jiaotong University

The issue of physical layer security of the wireless single-input multiple-output(SIMO) system is addressed in this paper. We propose a two-step transmission scheme with artificial noise to improve the security and the scheme does not require the channel state information of the eavesdropper. In the first step, the destination which has multiple antennas generates a random reference symbol and artificial noise and transmits them in the direction of the source and its orthogonal space, respectively. The reference symbol is received by the source without being polluted by the artificial noise, while it is jammed by the artificial noise for the eavesdropper. In the second step, the symbol of the source is multiplied by the received reference symbol and then transmitted. Finally, the destination can directly estimate the symbol of the source using the reference symbol. However, the eavesdropper needs to additionally estimate the reference symbol for demodulating the symbol of the source, which usually obtains an inaccurate result due to the artificial noise. The informationtheoretic security of our scheme is analyzed and a lower bound of the achievable secrecy rate is derived. The performance of the new scheme is compared with that of the traditional approach under different input signals through numerical simulations. The results show that the proposed scheme outperforms the traditional SIMO approach especially in the high SNR region.

关键词： wireless communication physical layer security multi-antenna SIMO artificial noise

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Joint cooperative beamforming and artificial noise design for secure AF relay networks with energy-harvesting eavesdroppers

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Frontiers of Information Technology & Electronic Engineering 2017年第6期18卷 850-862页

作者： He-hao NIU Bang-ning ZHANG Dao-xing GUO Yu-zhen HUANG Ming-yue LU College of Communications Engineering PLA University of Science and TechnologyNanjing 210007China

In this paper, we investigate physical layer security for simultaneous wireless information and power transfer in amplify-and-forward relay networks. We propose a joint robust cooperative beamforming and artificial noise scheme for secure communication and efficient wireless energy transfer. Specifically, by treating the energy receiver as a potential eavesdropper and assuming that only imperfect channel state information can be obtained, we formulate an optimization problem to maximize the worst-case secrecy rate between the source and the legitimate information receiver under both the power constraint at the relays and the wireless power harvest constraint at the energy receiver. Since such a problem is non-convex and hard to tackle, we propose a two-level optimization approach which involves a one-dimensional search and semidefinite relaxation. Simulation results show that the proposed robust scheme achieves better worst-case secrecy rate performance than other schemes.

关键词： Simultaneous wireless information and power transfer Physical layer security Relay networks Cooperative beamforming artificial noise

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Robust artificial noise-Aided Beamforming for A Secure MISO-NOMA Visible Light Communication System

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China Communications 2020年第11期17卷 42-53页

作者： Xiaodong Liu Zezong Chen Yuhao Wang Fuhui Zhou Shuai Ma School of Electronic Information Wuhan UniversityWuhan 430072China School of Information Engineering Nanchang UniversityNanchang 330031China College of Electronic and Information Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210000China School of Information and Control Engineering China University of Mining and TechnologyXuzhou 221116China Shanxi Key Laboratory of Information Communication Network and Security Xi’an University of Posts&TelecommunicationsXi’an 710121China

Visible light communication(VLC)and non-orthogonal multiple access(NOMA)have been deemed two promising techniques in the next wireless communication networks.In this paper,secure communications in the presence of potential eavesdropper are investigated for a multiple-input single-output VLC system with NOMA.The artificial noise jamming and beamforming technologies are applied to improve secure performance.A robust resource allocation scheme is proposed to minimize the total transmit power taking into account the constraints on the quality of service requirement of the desired users and the maximum tolerable data rate of the eavesdropper,and the practical imperfect channel state information of both the desired users and the eavesdropper.The formulated non-convex optimization problem is tackled based onS-Procedure and semi-definite programming relaxation.Simulation results illustrate that our proposed resource allocation scheme can effectively guarantee communication security and achieve transmit power saving.Moreover,the height and number of LED can significantly affect system performance and the optimum LED height can be obtained for different LED numbers.

关键词： artificial noise non-orthogonal multiple access physical-layer secrecy robust resource allocation visible light communication

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RIS-assisted MIMO secure communications with Bob's statistical CSI and without Eve's CSI

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Digital Communications and Networks 2023年第3期9卷 638-644页

作者： Wenwan Xu Jun Zhang Shu Cai Jue Wang Yi Wu Jiangsu Key Laboratory of Wireless Communications Nanjing University of Posts and TelecommunicationsNanjing210003China School of Information Science and Technology Nantong UniversityNantong226019China Fujian Provincial Engineering Technology Research Center of Photoelectric Sensing Application Fujian Normal UniversityFuzhou350007China

In this paper,we consider a reconfigurable intelligent surface(RIS)-assisted multiple-input multiple-output(MIMO)secure communication system,where only legitimate user's(Bob's)statistical channel state information(CSI)can be obtained at the transmitter(Alice),while eavesdropper's(Eve's)CSI is unknown.Firstly,the analytical expression of the achievable ergodic rate at Bob is obtained.Then,by exploiting Bob's statistical CSI,we jointly design the transmit covariance matrix at Alice and the phase shift matrix at the RIS to minimize the transmit power of the information signal under the quality-of-service(QoS)constraint of Bob.Finally,we propose an artificial noise(AN)-aided method without Eve's CSI to enhance the security of this system and use the residual power to design the transmit covariance for AN.Simulation results verify the convergence of the proposed method,and also show that there exists a trade-off between the secrecy rate and QoS of Bob.

关键词： Reconfigurable intelligent surface MIMO Ergodic secrecy rate Statistical CSI artificial noise

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Optimal power allocation for secure directional modulation networks with a full-duplex UAV user

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Science China(Information Sciences) 2019年第8期62卷 44-55页

作者： Zaoyu LU Linlin SUN Shuo ZHANG Xiaobo ZHOU Jinyong LIN Wenlong CAI Jin WANG Jinhui LU Feng SHU School of Electronic and Optical Engineering Nanjing University of Science and Technology Beijing Aerospace Automatic Control Institute

This paper makes an investigation of a secure unmanned aerial vehicle(UAV)-aided communication network based on directional modulation(DM). In this network, ground base station(GBS) acts as a control center to transmit confidential message and artificial noise(AN). The UAV user, moving along a linear flight trajectory, is intended to receive the useful information from GBS. At the same time, it also sends AN signals to further interference eavesdropper’s channel. Aiming at maximizing secrecy rate during the UAV flight process, a joint optimization problem is formulated with respect to power allocation(PA)factors, beamforming vector and AN projection matrices. For simplicity, maximum rate transmission, nullspace projection and the leakage-based method are applied to form the transmit beamforming vector, AN projection matrix at GBS, and AN projection vector at UAV user, respectively. Following this, the optimization problem reduces to a bivariate optimization programme with two PA factors. An alternating iterative algorithm(AIA) is proposed to optimize the two PA factors. Simulation results demonstrate that, compared to the half-duplex(HD) mode, the proposed strategy for full-duplex(FD) mode achieves a higher secrecy rate(SR) and outperforms the FD mode with fixed PA strategy.

关键词： UAV directional modulation secrecy rate artificial noise full-duplex power allocation

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A Novel Cooperative Physical Layer Security Scheme for Satellite Downlinks

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Chinese Journal of Electronics 2018年第4期27卷 860-865页

作者： LIU Jun WANG Jingjing LIU Weixin WANG Qunyang WANG Mengyuan College of Computer Science and Engineering Northeastern University Satellite Information Engineering Research Institute of Beijing

A physical layer security scheme based on cooperative relays is proposed to address the problem of eavesdropping in satellite downlink which is induced by the broadcasting nature of the shared communication medium and the long distance of the satellite-ground transmissions.By evaluating the outage probability, the relay nodes participating in cooperative communication can be divided into a cooperative forwarding group and a cooperative jamming group. The cooperative jamming group and the cooperative forwarding groups construct a cascaded channel which combined with the random weighting technique improves the quality of transmission on the main channel.The cooperative jamming group uses the main channel null space to transmit artificial noise which does not affect the quality of the main channel, but reduces the eavesdropping channel quality. Simulation results show that the proposed anti-eavesdropping scheme can maximize the quality difference between the main channel and the eavesdropping channels, which thereby may significantly improve the security capacity of satellite downlink systems.

关键词： Satellite communication Physical layer security Cooperative relay system artificial noise

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Cooperative beamforming design for physical-layer security of multi-hop MIMO communications

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Science China(Information Sciences) 2016年第6期59卷 153-166页

作者： Shiqi GONG Chengwen XING Zesong FEI Jingming KUANG School of Information and Electronics Beijing Institute of Technology

The security issue is critically important for wireless communications, especially for multi-hop communications. In this paper, we propose a cooperative secrecy beamforming scheme for a multi-hop MIMO communication network, in which there is a single-antenna source, multiple multi-antenna relays and a singleantenna destination. Moreover, two types of eavesdroppers exist in the network, one of which has known channel state information(CSI), while the other not. To achieve security communications, in our work null-space beamforming and artificial noise beamforming are jointly optimized to improve the secrecy rate of the multi-hop network. In nature, the joint optimization is nonconvex and challenging. Exploiting its structure, the considered optimization problem is decoupled into a series of subproblems that can be efficiently solved based on convex optimization theory. Finally, some numerical experiment results are provided to assess the performance of the proposed secrecy beamforming design.

关键词： MIMO physical layer security multi-hop network null-space beamforming artificial noise

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Robust secure transmission for multiuser MISO systems with probabilistic QoS constraints

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Science China(Information Sciences) 2016年第2期59卷 126-138页

作者： Lijian ZHANG Liang JIN Wenyu LUO Chunming WANG Yanqun TANG National Digital Switching System Engineering & Technological Research Center School of Information Systems Engineering Zhengzhou Information Science and Technology Institute

This paper considers a unicast multiuser multiple-input single-output(MISO) downlink system overheard by multiple single-antenna eavesdroppers. The objective is to jointly design the beamforming vectors and the artificial noise(AN) covariance matrix with imperfect channel state information(CSI) at the transmitter,such that the total transmit power is minimized while satisfying probabilistic quality of service(Qo S) constraints at legitimate users and the eavesdroppers. Using Bernstein-type inequalities and the S-procedure, we recast the non-convex power minimization problem as two different convex semidefinite programs(SDPs) which can be solved using interior-point methods. Simulation results show that the proposed methods outperform a nonrobust method and the ones using the isotropic AN.

关键词： physical layer security artificial noise imperfect CSI robust beamforming semidefinite program outage probability

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Secure Transmission in Downlink Non-Orthogonal Multiple Access Based on Polar Codes

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China Communications 2021年第9期18卷 221-235页

作者： Ce Sun Zesong Fei Bin Li Xinyi Wang Nan Li Lijie Hu School of Information and Electronics Beijing Institute of TechnologyBeijing 100081China Nanjing University of Information Science and Technology Nanjing 210044China China Mobile Research Institute Beijing 100053China

Non-orthogonal multiple access(NOMA)is deemed to have a superior spectral efficiency and polar codes have became the channel coding scheme for control channel of enhanced mobile broadband(eMBB)in the fifth generation(5G)communication systems.In this paper,NOMA combined with polar codes is used to achieve secure transmission.Both degraded wiretap channel and non-degraded wiretap channel are considered,where an eavesdropper intercepts the communication between base station(BS)and users.For the degraded wiretap channel scenario,a secure polar encoding scheme is proposed in NOMA systems with power allocation to achieve the maximum secrecy capacity.With regard to the nondegraded wiretap channel,a polar encoding scheme with multiple-input-single-output(MISO)system is proposed,where artificial noise is generated at BS to confuse the eavesdropper’s channel via transmit beamforming.The security and the secure rate are employed respectively in order to measure the secrecy performance.We prove that the proposed schemes for each scenario can achieve the secure rate and can transmit the signal securely and reliably.The simulation results show that the eavesdropper hardly decoding the secure signal when the legitimate receiver can decode the signal with very low block error rate(BLER).

关键词： physical layer security polar codes non-orthogonal multiple access artificial noise

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