检索结果-内蒙古大学图书馆

Fundamental Limits of Two-Hop MIMO Channels: An Asymptotic Approach

IEEE Transactions on Information Theory 2025年第6期71卷 4069-4111页

作者： Zhuang, Zeyan Zhang, Xin Xu, Dongfang Song, Shenghui The Hong Kong University of Science and Technology Department of Electronic and Computer Engineering Hong Kong Hong Kong The Hong Kong University of Science and Technology Division of Integrative Systems and Design Hong Kong Hong Kong

Multi-antenna relays and intelligent reflecting surfaces (IRSs) have been utilized to construct favorable channels to improve the performance of wireless systems. A common feature between relay systems and IRS-aided systems is the two-hop multiple-input multiple-output (MIMO) channel. As a result, the mutual information (MI) of two-hop MIMO channels has been widely investigated with very engaging results. However, a rigorous investigation on the fundamental limits of two-hop MIMO channels, i.e., the first and second-order analysis, is not yet available in the literature, due to the difficulties caused by the two-hop (product) channel and the noise introduced by the relay (active IRS). In this paper, we employ large random matrix theory, specifically Gaussian tools, to derive the closed form deterministic approximation for the mean and variance of the MI. Additionally, we determine the convergence rate for the mean, variance and the characteristic function of the MI, and prove the asymptotic Gaussianity. Furthermore, we also investigate the analytical properties of the fundamental equations that describe the closed-form approximation and prove the existence and uniqueness of the solution. An iterative algorithm is then proposed to obtain the solutions for the fundamental equations. Numerical results validate the accuracy of the theoretical analysis. © 1963-2012 IEEE.

关键词： Iterative methods

来源：评论

学校读者我要写书评

暂无评论

Nanoimprint lithography-assisted block copolymer self-assembly for hyperfine fabrication of magnetic patterns based on L10-FePt nanoparticles

引用

Science China Chemistry 2025年第5期68卷 2027-2034页

作者： Jie Zhang Yi Chen Guijun Li Zelin Sun Zhengong Meng Wai-Yeung Wong Department of Applied Biology and Chemical Technology and Research Institute for Smart Energy The Hong Kong Polytechnic University The Hong Kong Polytechnic University Shenzhen Research Institute Division of Integrative Systems and Design and Department of Electronic and Computer EngineeringThe Hong Kong University of Science and Technology School of Flexible Electronics (Future Technology) and Institute of Advanced Materials (IAM) Nanjing Tech University

L10-FePt-type bit-patterned media has provided a promising alternative for ultrahigh-density magnetic recording systems in the current digital era, but rapid fabrication of magnetic patterns with hyperfine bit islands is still challenging, especially with the target for miniaturization and scalable production simultaneously. Herein, Fe,Pt-containing block copolymers were utilized as single-source precursors for solution-processable patterning and subsequent generation of the demanding magnetic FePt dots by in situ pyrolysis. High-throughput nanoimprint lithography was initially employed to fabricate the predefined bit cells precisely,and then the intrinsic self-assembly of phase-separated block copolymers further drove the formation of accurate bit *** from the synergistic effect of top-down lithographic approach and bottom-up self-assembly, the customizable patterns could be achieved for large-scale mass production in targeted areas, but high-density isolated dots could also be accurately aligned along the patterned features after subsequent self-assembly. This reliable strategy would provide a good avenue to precisely construct ultrahigh-density magnetic data storage devices.

关键词： organometallic precursor magnetic nanoparticles block copolymer self-assembly nanoimprint lithography

来源：评论

学校读者我要写书评

暂无评论

TRANSMISSION SYSTEM MODEL IN THE TRACK-VEHICLE RELATIONSHIP BASED ON LONG TERM EVOLUTION technology

引用

Archives of Transport 2023年第2期66卷 89-108页

作者： Chrzan, Marcin Pirosz, Pawel Paś, Jacek Faculty of Transport Electrical Engineering and Information Technology Kazimierz Pulaski University of Technology and Humanities in Radom Radom Poland Faculty of Computing and Telecommunications Poznan University of Technology Poznań Poland Division Electronic Systems Exploitations Manager Military University of Technology Warszawa Poland

Because of degradations of the wired infrastructure connecting the element of railroad control systems, and related primarily to their destruction, the use of the radio transmission medium for independent management of railroad traffic control devices is increasingly being considered. An undoubted problem in implying such solutions is the security of transmission in such systems. It should be noted that security at a certain level of transmission is currently already offered by the radio transmission systems themselves, which has also been used in the GSM-R standard. The creation of a separate dedicated system for railroads involves huge expenditures for the design, testing, certification and, finally, construction and implementation of such technology. Therefore, in the opinion of the author of this dissertation, it is possible to use public open radio networks for the needs of railroads, which significantly reduces costs, since such a system is based on existing infrastructure. It is necessary to develop a way of transmitting information that meets the requirements of secure transmission in the sense of railroad traffic control systems. The task is to develop a general model for open radio transmission in traffic control systems based on the latest public radio standard, which is LTE, 5G or Future Railway Mobile Communications System (FRMCS). The article will present the concept of data transmission in the track – vehicle relationship with the use of LTE (Long Term Evolution) technology. It will show the concept of transmission based on the PNEN50159:2011 standard and the results of the tests conducted during control trips on the railway route. The main element that will be subject to the research will include the transmission safety and its delay. The impact of a type of transmission encryption on its delay will be estimated with the assumed blocks of data sent during the transmission. A probability distribution and density functions of the transmission delay pro

关键词： Radio transmission

来源：评论

学校读者我要写书评

暂无评论

Observation of Spurs Induced by Misaligned Sampling and Decimation Clocks 5

Observation of Spurs Induced by Misaligned Sampling and Deci...

引用

5th IEEE Eurasia Conference on IOT, Communication and engineering, ECICE 2023

作者： Liang, Yu-Shan Chen, You-Gang Wang, Tao National Kaohsiung University of Science and Technology Department of Electronic Engineering Kaohsiung Taiwan Electronic Systems Research Division National Chung-Shan Institute of Science and Technology Taoyuan Taiwan

ISBN: (纸本)9798350314694

We explored the root causes of spurs frequently encountered in modern high speed analog to digital conversion systems. With the growing significance of multi-channel/multi-core systems in enhancing operational speed, the use of misaligned clocks to control individual blocks produces undesirable consequences. We presented a theoretical analysis of how this phenomenon impacts the performance of parallel high speed ADCs with intuitive insights. These findings are valuable for system designers involved in clock distribution design and troubleshooting during measurements. © 2023 IEEE.

关键词： ADC clock-misalignment decimation sampling spur

来源：评论

学校读者我要写书评

暂无评论

DCU: Unidimensional Data Prediction with Graphical Model 6

DCU: Unidimensional Data Prediction with Graphical Model

引用

6th IEEE International Conference on Civil Aviation Safety and Information technology, ICCASIT 2024

作者： Yin, Jiazhi Xiao, Ming Shen, Binnan Liao, Xufei Aviation Safety Institute China Academy of Civil Aviation Science and Technology Beijing China Engineering and Technical Research Center of Civil Aviation Safety Analysis and Prevention of Beijing Beijing China Beijing Research Institute of Automation for Machinery Industry Co. Ltd. Beijing China Specialized Systems and Electronic Technology Engineering Division Beijing China

ISBN: (纸本)9798350389418

In view of the limited number of available models for one-dimensional data prediction tasks at present and in the past, and the underlying problems of RNN-like networks in most general models, we propose a new data prediction method. This method utilizes a two-dimensional model with a larger sampling area and more extensive branches to carry out the prediction task of one-dimensional time series data from the image level. We integrate one-dimensional data according to the time nodes and transform it into two-dimensional multi-channel images. We enhance the traditional encoding-decoding network structure by replacing part of the convolutional layers with Tokenized MLP. This modification ensures more accurate weight calculation of the model on a specific coordinate axis. Additionally, we improve the training mode of the traditional network architecture, and add a custom penalty mechanism on top of the loss function. This mechanism directly impacts the weight of the model nodes beyond the learning process, enhancing the controllability of the network training process. Through comparative experiments, our method demonstrates an 8.4 % improvement in MAE, a 7.8 % improvement in 12 fitting, and a 51.3 % improvement in test time compared with the traditional methods. © 2024 IEEE.

关键词： Prediction models

来源：评论

学校读者我要写书评

暂无评论

Study on the frequencies of natural oscillations of car transporter wagon

引用

Noise and Vibration Worldwide 2025年第1-2期56卷 5-24页

作者： Muradian, Leontii Shvets, Anzhelika Nikitenko, Anatolii Shvets, Angela Department of Wagons and Wagon Facilities Ukrainian State University of Science and Technologies Dnipro Ukraine Division of Traction and Electrical Power Economics Electrical Power Engineering Institute Warsaw University of Technology Warsaw Poland Department of Engineering and Design Specialized Department Microprocessor-Based Control Systems and Safety in the Railway Transport Ukrainian State University of Science and Technologies Dnipro Ukraine

The development of new products and services allows railway transport to constantly increase the fleet of specialised wagons, which, in comparison with the universal rolling stock, have the best technical and economic indicators. A significant part of cars is delivered by railways, and it is economically reasonable to transport them on a specialised rolling stock. In this regard, the development of a methodology for refined theoretical studies of the strength of bodies of a double-deck rolling stock for passenger cars transportation, the choice of appropriate design schemes and parameters of the bodies, the analysis of the frequencies and forms of their natural oscillations, taking into account the finite stiffness of the elements, are urgent research tasks. The research uses the methods of structural mechanics of rod systems, the applied theory of elasticity, and discrete masses. A wide range of frequencies and forms of the natural free oscillations was obtained using the discrete mass method for a structural scheme with load transfer from the upper to the lower level of the wagon with the help of four racks. The applied methodology of theoretical determination of frequencies and forms of the natural free oscillations of the car transporter wagon by the method of discrete masses is effective. It allows for the estimation of the dynamic characteristics of the wagon. © The Author(s) 2024.

关键词： Bending oscillations twisting oscillations bouncing oscillations car transporter wagon double-deck rolling stock final rigidity of elements

来源：评论

学校读者我要写书评

暂无评论

Machine learning algorithm partially reconfigured on FPGA for an image edge detection system

引用

Journal of electronic Science and technology 2024年第2期22卷 48-68页

作者： Gracieth Cavalcanti Batista Johnny Oberg Osamu Saotome Haroldo F.de Campos Velho Elcio Hideiti Shiguemori Ingemar Soderquist Division of Electronic and Embedded Systems KTH Royal Institute of TechnologyStockholm 16440Sweden Electronic Engineering Division Aeronautics Institute of TechnologySao Josédos Campos SP 12228-900Brazil Laboratory of Applied Computing and Mathematics National Institute for Space ResearchSao Josédos Campos SP 12227-900Brazil Department of C4ISR Institute of Advanced StudiesSao Josédos Campos SP 12228-001Brazil Saab AB Linkoping 58188Sweden

Unmanned aerial vehicles(UAVs)have been widely used in military,medical,wireless communications,aerial surveillance,*** key topic involving UAVs is pose estimation in autonomous navigation.A standard procedure for this process is to combine inertial navigation system sensor information with the global navigation satellite system(GNSS)***,some factors can interfere with the GNSS signal,such as ionospheric scintillation,jamming,or *** alternative method to avoid using the GNSS signal is to apply an image processing approach by matching UAV images with georeferenced *** a high effort is required for image edge *** a support vector regression(SVR)model is proposed to reduce this computational load and processing *** dynamic partial reconfiguration(DPR)of part of the SVR datapath is implemented to accelerate the process,reduce the area,and analyze its granularity by increasing the grain size of the reconfigurable *** show that the implementation in hardware is 68 times faster than that in *** architecture with DPR also facilitates the low power consumption of 4 mW,leading to a reduction of 57%than that without *** is also the lowest power consumption in current machine learning hardware ***,the circuitry area is 41 times *** with Gaussian kernel shows a success rate of 99.18%and minimum square error of 0.0146 for testing with the planning *** system is useful for adaptive applications where the user/designer can modify/reconfigure the hardware layout during its application,thus contributing to lower power consumption,smaller hardware area,and shorter execution time.

关键词： Dynamic partial reconfiguration(DPR) Field programmable gate array(FPGA)implementation Image edge detection Support vector regression(SVR) Unmanned aerial vehicle(UAV) pose estimation

来源：评论

学校读者我要写书评

暂无评论

A W-Band Power Efficient Frequency Doubler

A W-Band Power Efficient Frequency Doubler

引用

2023 IEEE Microwaves, Antennas, and Propagation Conference, MAPCON 2023

作者： Biswas, Bijit Mandal, Mrinal Kanti Circuits & Systems Division Society for Applied Microwave Electronic Engineering and Research Kolkata India Indian Institute of Technology Department of Electronics & Electrical Communication Engineering Kharagpur India

ISBN: (纸本)9798350328264

A frequency doubler is reported in a hybrid Microwave Integrated Circuit (MIC) configuration using a Schottky diode based design at the W-band. Unwanted harmonic reuse scheme has been adopted for optimal use of the nonlinearity of the multiplying semiconductor device. Commercially available low cost device has been used in this simple balanced design and required results have been achieved. A comparison with prior art works indicates competitive performance. Output power is enhanced by reflecting the unwanted harmonics from the output side back towards the diode again, which mixes with the input fundamental frequency to effectively enhance the output power at the desired harmonic frequency. Thus, improvement in conversion loss is accomplished. A special technique using microstrip stubs has been adopted to provide proper RF grounding to the Schottky varactor diodes at the desired frequency. Measured result shows a minimum conversion loss of 19.8 dB over 89 to 99 GHz with 15 dBm of input power. Spurious rejection is in excess of 50 dBc. Measured output spectrum is highly stable with elevated spectral purity. Therefore, the proposed frequency multiplier is useful for Wband transceivers for wireless communication, imaging and other potential applications. © 2023 IEEE.

关键词： frequency multipliers millimeter wave nonlinear circuits Schottky diodes W-band

来源：评论

学校读者我要写书评

暂无评论

Segmentation of Retina Vessels in 2D OCT-Reconstructed Fundus Images with 3D UNet 26

Segmentation of Retina Vessels in 2D OCT-Reconstructed Fundu...

引用

26th IEEE Signal Processing: Algorithms, Architectures, Arrangements, and Applications, SPA 2023

作者： Marciniak, Tomasz Stankiewicz, Agnieszka Zaradzki, Przemyslaw Poznan University of Technology Division of Electronic Systems and Signal Processing Institute of Automatic Control and Robotics Department of Control Robotics and Electrical Engineering Poznan Poland

ISBN: (纸本)9798350304985

This paper presents an analysis of the effectiveness of blood vessel segmentation in human retinal images. The segmentation process was carried out for three-dimensional optical coherence tomography (OCT) scans using the author's publicly available CAVRI-C database. A 3D version of the U-Net artificial neural network was used. Various dimensions of the input blocks were investigated to determine their influence on the segmentation process. The effectiveness of the proposed solutions was evaluated using various metrics and the results obtained were compared with the 2D solution, also based on neural networks. The use of the proposed solutions allowed us to improve the segmentation even by 15% (in the case of the F1-score). © 2023 division of Signal Processing and electronic systems, Poznan University of technology (DSPES PUT).

关键词： Optical tomography

来源：评论

学校读者我要写书评

暂无评论

Efficient Brillouin frequency shift extraction method employing Brillouin gain spectrum fitting in the distributed BOTDA fiber sensor 10

Efficient Brillouin frequency shift extraction method employ...

引用

10th IEEE International Conference on Photonics, ICP 2024

作者： Hamzah, Abdulwahhab Essa Hamzah, Mustafa Essa Ghadzali, Intan Fatimah Sasila Fadhel, Mahmoud Muhanad Sapiee, Nurfarhana Mohamad Zan, Mohd Saiful Dzulkefly Tanaka, Yosuke Mohamad, Hisham Ali, Sawal Hamid Md Bakar, Ahmad Ashrif A. Department of Electrical Electronic and Systems Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia Selangor Bangi43600 Malaysia Division of Advanced Electrical and Electronic Engineering Institute of Engineering Tokyo University of Agriculture and Technology Japan Civil & Environmental Engineering Department Universiti Teknologi PETRONAS Seri Iskandar Perak32610 Malaysia

ISBN: (纸本)9798350383164

—This paper demonstrates the deployment of quadratic curve fitting (QCF) based on half-peak Brillouin gain spectrum (BGS) for fast and accurate Brillouin frequency shift (BFS) extraction. The method was analysed and compared with three other methods such as Lorentzian curve fitting (LCF), Gaussian curve fitting (GCF) and pseudo-Voigt curve fitting (pVCF). The QCF based on half-peak achieved an accuracy similar to other curve fitting methods. In addition, the QCF has a faster processing time by eight-fold than the others, allowing the system to handle a large amount of data with good performance. The results would provide some general ideas for deploying the QCF algorithm for the system on chip platform with direct detection for fast BFS measurement. ©2024 IEEE.

关键词： System-on-chip

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：