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Secure beamforming and deployment design for rate-splitting multiple access-based UAV communications

Science China(Information Sciences) 2025年第1期68卷 342-356页

作者： Bing WANG Xiaofeng TAO Shujun han Huici WU Kai YANG zhu han National Engineering Research Center of Mobile Network Technologies Beijing University of Posts and Telecommunications Peng Cheng Laboratory Department of Electrical and Computer Engineering University of Houston

Rate-splitting multiple access(RSMA) has recently gained attention as a potential robust multiple access(MA)scheme for upcoming wireless networks. Given its ability to efficiently utilize wireless resources and design interference management strategies, it can be applied to unmanned aerial vehicle(UAV) networks to provide convenient services for large-scale access ground users. However, due to the line-of-sight(LoS) broadcast nature of UAV transmission, information is susceptible to eavesdropping in RSMA-based UAV networks. Moreover, the superposition of signals at the receiver in such networks becomes complicated. To cope with the challenge, we propose a two-user multi-input single-output(MISO) RSMA-based UAV secure transmission framework in downlink communication networks. In a passive eavesdropping scenario, our goal is to maximize the sum secrecy rate by optimizing the transmit beamforming and deployment location of the UAV-base station(UAV-BS),while considering quality-of-service(QoS) constraints, maximum transmit power, and flight space limitations. To address the non-convexity of the proposed problem, the optimization problem is first decoupled into two subproblems. Then, the successive convex approximation(SCA) method is employed to solve each subproblem using different propositions. In addition, an alternating optimization(AO)-based location RSMA(L-RSMA) beamforming algorithm is developed to implement joint optimization to obtain the suboptimal solution. Numerical results demonstrate that(1) the proposed L-RSMA scheme yields a28.97% higher sum secrecy rate than the baseline L-space division multiple access(SDMA) scheme;(2) the proposed L-RSMA scheme improves the security performance by 42.61% compared to the L-non-orthogonal multiple access(NOMA) scheme.

关键词： rate-splitting multiple access UAV communication precoding optimization deployment location physical layer security

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Beyond the operator algebra—To be nonlocal realism of quantum mechanics

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Science China(Physics,Mechanics & Astronomy) 2018年第5期61卷 77-78页

作者： Zhi-han zhu Wang Da-Heng Collaborative Innovation Center for Science of Quantum Manipulation & Control Heilongjiang Provincial Key Laboratory of Quantum Manipulation & Control Harbin University of Science and Technology

In 1905, Albert Einstein presented his milestone theory of photons in his paper titled ＂On a Heuristic Viewpoint Con- cerning the Production and Transformation of Light＂ based on Max Planck＇s black-body radiation theory. The ground- breaking theory successfully solved the paradox between Maxwell＇s wave theory of light and the experimental finding on photoelectric effect, propelling the concept of wave-par- ticle duality and granting Einstein with his solo Nobel Prize in 1921. Later, a group of physicists and mathematicians developed a wavefunction formulation based on operator algebra to describe quantum theory. This powerful mathe- matical abstraction, the greatest theoretical invention in hu- man history, enables us to calculate and predict physical process in the microscopic world that people cannot in- tuitively understand, such as atomic energy levels, electron tunneling, and photon trajectories.

关键词：代数学操作员非局部力学爱因斯坦普朗克常数波浪理论麦克斯韦

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Preliminary study on active features of Fenghuang-shan-Tianshui fault, West Qinling north boundary fault zone since the late of Late Pleistocene

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Acta Seismologica Sinica(English Edition) 2001年第2期14卷 230-233页

作者： han zhu-jun Institute of Geology China Seismological Bureau Beijing China

West Qinling north boundary fault zone (WQNBFZ) is a major NWW-striking fault in the east boundary of Tibetan Plateau, which is parallel to the Xianshuihe fault zone, Eastern Kunlun fault zone and Haiyuan fault zone. It is of mainly sinistral strike-slip. England and Molnar (1990) and WANG and MA (1998) proposed that these strike-slip faults divided the east part of Tibetan Plateau into elongate blocks, which slide successively towards the east, accompanied possibly by the clockwise rotation. What is more, the occurrence frequency of earthquakes with M 36.5 along WQNBFZ is also high, such as BC 47 Zhangxian M=6.8 earthquake, the 128 Gangu M=6.5 earth-quake, the 143 Gangu M=7 earthquake, the 734 Tianshui M=7 earthquake, the 1756 Wushan M=6.5 earthquake and the 1936 Kangle M=6.8 earthquake. However, compared with researches on Haiyuan fault zone, Xianshuihe fault zone and Longmenshan fault zone (Institute of Geology of State Seismological Bureau, Seismological Bureau of Ningxia Hui Autonomous Region, 1990; LI, 1993; DENG, et al, 1994; Burchfiel, et al, 1995), the study on WQNBFZ is still weak, although some researches have been done by KANG (1990) and TENG, et al (1991). Based on the field investigation and sample dating, the active features about the Fenghuangshan-Tianshui fault (FTF) of WQNBFZ are discussed in the paper.……

关键词： Late Pleistocene

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Distributed Beamforming Based Wireless Power Transfer:Analysis and Realization

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Tsinghua Science and Technology 2020年第6期25卷 758-775页

作者： Xiaoran Fan han Ding Yanyong Zhang Wade Trappe zhu han Rich Howard the Wireless Information Network Laboratory(WINLAB) Rutgers UniversityNew BrunswickNJ 08901USA the Department of Computer Science and Technology Xi'an Jiaotong UniversityXi'an 710049China the Department of Computer Science and Technology University of Science and Technology of ChinaHefei 230052China the Department of Electrical and Computer Engineering University of HoustonHoustonTX 77004USA.

This paper presents a new Wireless Power Transfer(WPT)approach by aligning the phases of a group of spatially distributed Radio Frequency(RF)transmitters(TX)at the target receiver(RX)*** approach can transfer energy over tens of meters and even to targets blocked by *** to popular beamforming based WPTs,our approach leads to a drastically different energy density distribution:the energy density at the target receiver is much higher than the energy density at other *** to this unique energy distribution pattern,our approach offers a safer WPT solution,which can be potentially scaled up to ship a higher level of energy over longer ***,we model the energy density distribution and prove that our proposed system can create a high energy peak exactly at the target *** we conduct detailed simulation studies to investigate how the actual energy distribution is impacted by various important system parameters,including number/topology of transmitters,transmitter antenna directionality,the distance between receiver and transmitters,and environmental ***,we build an actual prototype with 17 N210 and 4 B210 Universal Software Radio Peripheral(USRP)nodes,through which we validate the salient features and performance promises of the proposed system.

关键词： Wireless Power Transfer(WPT) distributed beamforming wireless network

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The diversity and evolution of retroviruses:Perspectives from viral“fossils”

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Virologica Sinica 2022年第1期37卷 11-18页

作者： Jialu Zheng Yutong Wei Guan-zhu han Jiangsu Key Laboratory for Microbes and Functional Genomics College of Life SciencesNanjing Normal UniversityNanjing210023China

Retroviruses exclusively infect vertebrates,causing a variety of *** replication of retroviruses requires reverse transcription and integration into host *** infecting germline cells,retroviruses become inherited vertically,forming endogenous retroviruses(ERVs).ERVs document past viral infections,providing molecular fossils for studying the evolutionary history of *** this review,we summarize the recent advances in understanding the diversity and evolution of retroviruses from the perspectives of viral fossils,and discuss the effects of ERVs on the evolution of host biology.

关键词： Retroviruses Endogenous retroviruses(ERVs) Origin and evolution Diversity

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Simulation of bluff body stabilized flows with hybrid RANS and PDF method

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Acta Mechanica Sinica 2007年第3期23卷 263-273页

作者： Minming zhu Xingsi han Haiwen Ge Yiliang Chen Department of Thermal Science and Energy Engineering University of Science and Technology of China Hefei 230027 China

The motivation of this study is to investigate the turbulence-chemistry interactions by using probability density function （PDF） method. A consistent hybrid Reynolds Averaged Navier-Stokes （RANS）/PDF method is used to simulate the turbulent non-reacting and reacting flows. The joint fluctuating velocity-frequency-composition PDF equation coupled with the Reynolds averaged density, momentum and energy equations are solved on unstructured meshes by the Lagrangian Monte Carlo （MC） method combined with the finite volume （FV） method. The simulation of the axisymmetric bluff body stabilized non-reacting flow fields is presented in this paper. The calculated length of the recirculation zone is in good agreement with the experimental data. Moreover, the significant change of the flow pattern with the increase of the jet-to-coflow momentum flux ratio is well predicted. In addition, comparisons are made between the joint PDF model and two different Reynolds stress models.

关键词： Hybrid algorithm Unstructured mesh Finite volume method PDF method Bluff body stabilized flow

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A unified approach for least-squares surface fitting

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Science China(Physics,Mechanics & Astronomy) 2004年第Z1期47卷 72-78页

作者： zhu Limin DING han School of Mechanical Engineering Shanghai Jiao Tong University Shanghai 200030 China School of Mechanical Engineering Shanghai Jiao Tong University Shanghai 200030 China

This paper presents a novel approach for least-squares fitting of complex surface to measured 3D coordinate points by adjusting its location and/or shape. For a point expressed in the machine reference frame and a deformable smooth surface represented in its own model frame, a signed point-to-surface distance function is defined, and its increment with respect to the differential motion and differential deformation of the surface is derived. On this basis, localization, surface reconstruction and geometric variation characterization are formulated as a unified nonlinear least-squares problem defined on the product space SE(3)×Km. By using Levenberg-Marquardt method, a sequential approximation surface fitting algorithm is developed. It has the advantages of implementational simplicity, computational efficiency and robustness. Applications confirm the validity of the proposed approach.

关键词： surface fitting, least-squares, rigid body motion, deformation, distance function, optimization.

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Distortion minimization for multimedia transmission in NOMA HAP-UAV integrated aerial access networks

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Chinese Journal of Aeronautics 2022年第9期35卷 81-94页

作者： Guobin ZhanG zhu han hang XIN Xin WEI Boya DI School of Electrical Engineering and Intelligentization Dongguan University of TechnologyDongguan 523808China Department of Electrical and Computer Engineering and Department of Computer Science University of HoustonTX77004USA School of Computer Science and Technology Dongguan University of TechnologyDongguan 523808China Department of Computing Imperial CollegeLondon SW72AzUK

Aerial access networks have been envisioned as a promising 6G solution to enhance the ground communication systems in both coverage and capacity. To better utilize the spectrum and fully explore different channel characteristics, this paper constructs an integrated network comprising the High Altitude Platform(HAP) and Unmanned Air Vehicles(UAVs) with the NonOrthogonal Multiple Access(NOMA) technology. In order to improve the transmission quality of images and videos, a power management scheme is proposed to minimize the distortion of the transmissions from the HAP and UAVs to the terminals. The power control is formulated as a non-convex problem constrained by the maximal transmit power and the minimal terminal rate requirements. The variable substitution and the first-order Tailor’s expansion is used to transform it into a sequence of convex problems, which are subsequently solved through the gradient projection method. Simulation demonstrates the signal distortion and error rate improvement achieved by the proposed algorithm.

关键词： Aerial Access Networks High Altitude Platform Non-Orthogonal Multiple Access Sixth-Generation Unmanned Air Vehicles

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A 9×9 matrix representation of Temperley-Lieb algebra and corresponding entanglement

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Chinese Physics B 2012年第2期21卷 94-97页

作者： Gou Li-Dan zhu Rui-han School of Science Changchun University of Science and TechnologyChangchun 130022China

We present the matrix U. The 9 × 9 U matrix is a representation of specialized Temperley-Lieb algebra. Based on which, a unitary R matrix is generated via the Yang-Baxterization approach. The 9 × 9 R matrix, a so... 详细信息

关键词： Temperley-Lieb algebra. Yang-Baxter equation entanglement

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A data analysis of political polarization using random matrix theory

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Science China(Information Sciences) 2020年第2期63卷 236-238页

作者： Hui CHEN Xiaofeng TAO Na LI zhu han National Engineering Lab for Mobile Network Technologies Beijing University of Posts and Telecommunications Electrical and Computer Engineering and Computer Science University of Houston

Dear editor,Data analysis science is currently a hot topic in industry and academia due to ubiquitous and rapidly growing data [1, 2]. Data analysis technology has been applied in a variety of fields and has provided efficient and profitable data-driven decisions. For instance, since the beginning of the20th century, large-scale opinion polls have been

关键词： A data analysis of political polarization using random matrix theory RMT

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