检索结果-内蒙古大学图书馆

Near Optimal Hybrid Digital-Analog Beamforming for mmWave Point-to-Point MIMO Transmissions Using OTFS Waveforms

IEEE Transactions on Communications 2025年

作者： Liu, Mengmeng Li, Shuangyang Wei, Zhiqiang Bai, Baoming Caire, Giuseppe Ng, Derrick Wing Kwan Xidian University State Key Lab. of ISN Xi'an710071 China Technische Universität Berlin Electrical Engineering and Computer Science Department Berlin10587 Germany Xi'an Jiaotong University School of Mathematics and Statistics Xi'an710049 China Peng Cheng Laboratory Guangdong Shenzhen518055 China Guangdong Guangzhou510555 China University of New South Wales School of Electrical Engineering and Telecommunications SydneyNSW2052 Australia

In this paper, a point-to-point (P2P) orthogonal time frequency space (OTFS)-based multiple-input multiple-output (MIMO-OTFS) transmission scheme is devised for millimeter wave (mmWave) channels. The proposed transmission scheme relies on a low-complexity hybrid digital-analog beamforming (HBF) scheme that exploits the delay-Doppler (DD) domain channel properties, where detailed design criteria for different channel conditions are presented, including the case where paths are indistinguishable by angles. Thanks to the proposed HBF scheme, approximate path-wise interference-free transmission of multiple data streams is achieved, and consequently, only little pre-equalization is required for combating the residual channel impairments. The achievable rate of the proposed scheme is studied and compared with the orthogonal frequency-division multiplexing (OFDM) counterpart. In particular, we unveil that the condition number of the effective angular domain matrix for OTFS is smaller than that for OFDM, due to the enhanced path separability in the DD domain. As a result, the proposed MIMO-OTFS transmission scheme demonstrates superior performance over the MIMO-OFDM transmission scheme. Our numerical results corroborate our theoretical analysis and show a near-optimal rate performance with significantly reduced complexity compared to the optimal singular value decomposition (SVD) precoding method. © 1972-2012 IEEE.

关键词： Orthogonal frequency division multiplexing

来源：评论

学校读者我要写书评

暂无评论

Toward reverse engineering on secret S-boxes in block ciphers

引用

Science China(Information Sciences) 2014年第3期57卷 169-186页

作者： TANG Ming QIU ZhenLong PENG HongBo HU XiaoBo YI Mu ZHANG HuanGuo School of Computer Science Wuhan University State Key Lab. of AIS & TC Ministry of EducationWuhan University

It has been widely accepted that the security cryptosystems should be only dependent on the security of their secret ***,there are still secret ciphers with unknown components in their commercial applications due to various *** existing reverse engineering analyzes are developed for analyzing specific ciphers,and cannot cope with secret algorithms with diferent *** looking into the common characteristics of the secret algorithms of ciphers implemented with unknown S-boxes,we proposed a novel reverse engineering analysis approach referred to as Signed Reverse Engineering based on Diferential Power Analysis(SREDPA).It is a generic reverse engineering analysis and can recover the parameters of the secret S-boxes of the block ciphers in typical structures such as SPN,Feistel,and XFeistel(eXtended Feistel).By identifying the bias of the diferential power analysis(DPA)traces,we build the theoretical model of SREDPA and prove its *** are performed on secret algorithms in diferent structures and further validate our SREDPA *** complexity of SREDPA only relies on the size of S-boxes and the reverse engineering analysis is *** shown in the theoretical analysis and the conducted experiments,our SREDPA approach is readily to be extended for analyzing other secret ciphers with unknown *** renders a new challenge on the design and implementation of secret ciphers.

关键词： SCA DPA SPEDPA cryptanalysis block ciphers S-boxes

来源：评论

学校读者我要写书评

暂无评论

SMOOTHING OF FREE-FORM SURFACES WITH BEZIER PATCHES

引用

computer AIDED GEOMETRIC DESIGN 1995年第3期12卷 231-249页

作者： MA, LZ PENG, QS State Key Lab. of CAD & Computer Graphics Zhejiang University Hangzhou 310027 People's Republic of China

In this paper, a unified method for smoothing free-form surfaces with Bezier patches is presented. A non-smooth surface consisting of bicubic patches is turned into a G(1) surface by the following process. Trim each patch along user-defined parameter lines using subdivision. Attach eight patches (one to each edge and one to each vertex) to each trimmed patch to blend between it and its neighbor patches. Using this method, solid objects bounded with bicubic Bezier patches can be G(1) smoothed with bicubic patches. The operation is local. It provides designers with the facility to adjust the shape of a smoothed object interactively. The method can also be used for constructing smooth closed surfaces whose modeling is important for CAD/CG (cf. (Barnhill, 1985)).

关键词： COMPUTATIONAL GEOMETRY AND OBJECT MODELING, CURVE, SURFACE, SOLID, AND OBJECT REPRESENTATIONS CAD/CG CAGD BEZIER SURFACES SMOOTHING GEOMETRIC CONTINUITY TRANSITION SURFACES

来源：评论

学校读者我要写书评

暂无评论

A set-oriented approach to presenting recursive XML query with logic views

引用

Journal of Computational Information Systems 2014年第2期10卷 849-857页

作者： Cai, Rui He, Yanxiang Li, Xuhui Qian, Tieyun Zhong, Ming State Key Lab. of Software Engineering Computer School Wuhan University Wuhan 430072 China

Recursive query is an interesting and subtle topic in XML query. Existing XML query languages often resort to recursive function or recursive predicate to present recursive XML query. However, this approach implicitly adopts a tuple-oriented way to query processing, which is not fit for the set-oriented data processing in databases. In this paper, we propose a set-oriented approach to presenting recursive XML query in a pattern-based logic view named LSV. LSV deploys the logic and the set operator to compose tree-like patterns, which can expressively specify the logic semantics in XML elements. With the assistance of the descendant operator and the syntactic and semantic mechanisms of LSV, the common recursive XML queries in practice can be easily presented in a set-oriented way. We demonstrate the usage and the advantage of the LSV with some typical recursive queries. Copyright © 2014 Binary Information Press.

关键词： Semantics

来源：评论

学校读者我要写书评

暂无评论

Line clipping against polygonal window algorithm based on the multiple virtual boxes rejecting

引用

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2005年第B08期6卷 100-107页

作者：王进陆国栋彭群生吴煊晖 State Key Lab. of CAD&CG Zhejiang University Department of Electrical and Computer Engineering National University of Singapore

This paper presents a new algorithm for line clipping against a polygonal window by exploiting the local relationship between each line segment and the polygon. Firstly, a minimal enclosing box （MEB） of the polygon is adopted to reject the invisible line segments located outside the MEB. Secondly, a 45° rotated box is used to encode the endpoint of the line segment, and then reject a portion of the invisible segments crossing polygon comers. Finally, instead of encoding the endpoints of all line segments with respect to the polygonal window, each vertex of the polygon is encoded, taking the line segment to be clipped as reference. For efficient encoding of the polygon vertices, a new concept, termed with slope adaptive virtual box, is introduced regarding each line segment. Such a box can not only conveniently reject all totally invisible lines lying outside the MEB conveniently, but also precisely identify the edges of the polygon with which the line segment potentially intersects. With the summation of the vertex codes, it can be verified whether the line segment is separated from or potentially intersects the polygon window. Based on the product of the codes of adjacent vertices, singular cases of intersection can be solved accurately. Experimental results demonstrate the efficiency and stability of the new algorithm.

关键词： Polygon vertex encoding Adaptive virtual box Line segment rejection Line segment intersection Line clipping

来源：评论

学校读者我要写书评

暂无评论

Modeling and analyzing method for CPS software architecture energy consumption

Journal of Software

引用

Journal of Software 2013年第11期8卷 2974-2981页

作者： Zhang, Guangquan Zhang, Kan Zhu, Xueyang Chen, Mingcai Xu, Chengkai Shao, Yuzhen School of Computer Science and Technology Soochow University Suzhou China State Key Lab. for Novel Software Technology Nanjing University Nanjing China State Key Lab. of Computer Science Institute of Software Chinese Academy of Science Beijing China

CPS is a kind of networked embedded system. Its trustworthiness and cost are impacted by energy consumption. So design a low-power, high trustworthiness CPS has been a major challenge. Modeling and analyzing the energy consumption of CPS software architecture at design stage can help to find the energy consumption design defects. These methods can effectively improve the trustworthiness of the CPS software and reduce development costs. Against this problem, first introduce the concept of the energy consumption time Petri nets;then through analyzing the characteristics of the CPS software energy consumption, use energy consumption time Petri nets to construct the CPS software architecture energy consumption model and discuss the energy consumption problems of CPS software such as lowest energy consumption, largest energy consumption and average energy consumption;Finally, indicate the effectiveness of the proposed method by an instance. © 2013 ACADEMY PUBLISHER.

关键词： Energy utilization

来源：评论

学校读者我要写书评

暂无评论

PPO-Based Vehicle Control for Ramp Merging Scheme Assisted by Enhanced C-V2X

arXiv

引用

arXiv 2025年

作者： Wu, Qiong Ji, Maoxin Fan, Pingyi Wang, Kezhi Cheng, Nan Chen, Wen Letaief, Khaled B. The School of Internet of Things Engineering Jiangnan University Wuxi214122 China The Department of Electronic Engineering State Key laboratory of Space Network and Communications Beijing National Research Center for Information Science and Technology Tsinghua University Beijing100084 China The Department of Computer Science Brunel University Middlesex LondonUB8 3PH United Kingdom The State Key Lab. of ISN School of Telecommunications Engineering Xidian University Xi’an710071 China The Department of Electronic Engineering Shanghai Jiao Tong University Shanghai200240 China Hong Kong

On-ramp merging presents a critical challenge in autonomous driving, as vehicles from merging lanes need to dynamically adjust their positions and speeds while monitoring traffic on the main road to prevent collisions. To address this challenge, we propose a novel merging control scheme based on reinforcement learning, which integrates lateral control mechanisms. This approach ensures the smooth integration of vehicles from the merging lane onto the main road, optimizing both fuel efficiency and passenger comfort. Furthermore, we recognize the impact of vehicle-to-vehicle (V2V) communication on control strategies and introduce an enhanced protocol leveraging Cellular Vehicle-to-Everything (C-V2X) Mode 4. This protocol aims to reduce the Age of Information (AoI) and improve communication reliability. In our simulations, we employ two AoI-based metrics to rigorously assess the protocol's effectiveness in autonomous driving scenarios. By combining the NS3 network simulator with Python, we simulate V2V communication and vehicle control simultaneously. The results demonstrate that the enhanced C-V2X Mode 4 outperforms the standard version, while the proposed control scheme ensures safe and reliable vehicle operation during on-ramp merging. Copyright © 2025, The Authors. All rights reserved.

关键词： Problem oriented languages

来源：评论

学校读者我要写书评

暂无评论

An adaptive physically-based deformation on distance fields

引用

Journal of Information and Computational Science 2009年第6期6卷 2263-2270页

作者： Wu, Xiaoxiao Liang, Xiaohui Xu, Qidi State Key Lab. of Virtual Reality Technology School of Computer Science Beihang University Beijing 100191 China

This paper presents a novel adaptive deformation algorithm by integrating the representations of ADFs and physically based deformable models. The octree-based adaptively sampled distance fields (ADFs) are employed as the shape representation. The deformation of the ADFs is governed by the principle of physical dynamics and achieved by manipulating the scalar fields directly. A dynamic adaptive resampling scheme for ADFs is used during deformations. The physically based model of mass-spring is integrated into irregular fields for deformation. The stiffness of the non-uniform springs in the system is adaptive to spatial resolution of ADFs to avoid non-homogeneity in physics caused by the irregular structure. The results show that our physically based deformation algorithm based on the representation of ADFs outperforms regular sampled distance field based deformation algorithm in terms of time and memory efficiency, and has potential applications in physically-based interactive sculpting. © 2009 Binary Information Press.

关键词： Deformation

来源：评论

学校读者我要写书评

暂无评论

Sound and complete rules for data reification

引用

Science in China, Series E: Technological Sciences 1997年第4期40卷 x7-386页

作者： Ju, Jian State Key Lab. Novel Software T. Institute of Computer Software Nanjing University Nanjing 210093 China

The sound and complete rules for data reification in the algebraic framework are discussed. Based on these rules, the retrieve function approach in VDM is extended and the biased model and non-determinacy can be treat... 详细信息

关键词： data reification VDM simulation

来源：评论

学校读者我要写书评

暂无评论

Breaking adaptive multicast deadlock by virtual channel address/data FIFO decoupling

Breaking adaptive multicast deadlock by virtual channel addr...

引用

2nd International Workshop on Network on Chip architectures, NoCArc 2009, In conjunction with the 42nd Annual IEEE/ACM International Symposium on Microarchitecture, MICRO42

作者： Keung, Ka-Ming Tyagi, Akhilesh Computer Architecture Lab. Iowa State University Ames IA 50010 United States

ISBN: (纸本)9781605587745

As computing goes to system-on-chip era, on-chip network becomes an essential infrastructure for on-chip modules (cores) communication. 2D-Mesh is the most common on-chip network topology providing high throughput point-to-point communication due to its simplicity and regularity. A well-designed 2D-Mesh wormhole router should be deadlock free while supporting multicast and adaptive routing. Unfortunately, there exists no router design providing all these characteristics concurrently. In this paper, we propose an on-chip address-data decoupled FIFO wormhole router which supports adaptive routing, native multicast and deadlock free network guarantee. For a network using a 30-flit packet, our wormhole router increases the area efficiency by 49.5% compared with a virtual cut-through router. Copyright 2009 ACM.

关键词： Routers

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：