检索结果-内蒙古大学图书馆

IEEE/CIC International Conference on Communications in China

作者： Rongsheng Li Hui Gao Tiejun Lv Key Laboratory of Trustworthy Distributed Computing and Service Ministry of Education School of Information and Communication Engineering Beijing University of Posts and Telecommunications

ISBN: (纸本)9781479941452

In future wireless communication systems, multiple-input multiple-output (MIMO) technique and multi-user scheduling may play a key role in enhancing link reliability and spectral efficiency. In addition, linear signal processing is near-optimal when the number of the antennas becomes very large in the next generation wireless network. In this paper, we aim to investigate overall outage performance of multi-user MIMO broadcast system using minimum mean squared error receivers. Several scheduling algorithms are considered over Rayleigh fading channel. Tight and closed-form upper bounds of the overall outage probabilities are derived for two round-robin scheduling algorithms and two feedback-based opportunistic scheduling algorithms. Our analysis indicates that there exists an performance gap between opportunistic scheduling algorithm and stream-specific opportunistic scheduling algorithm. This gap is related to the number of transmit data streams N_t and the number of users K, and the gap becomes larger as N_t and K increase.

关键词： MIMO communication Rayleigh channels broadcast communication least mean squares methods multi-access systems radio links radio receivers scheduling telecommunication network reliability MIMO multiuser broadcast scheduling MMSE receiver Rayleigh fading channel antennas feedback-based opportunistic scheduling algorithms linear signal processing minimum mean squared error multiple-input multiple-output outage analysis round-robin scheduling algorithms stream-specific opportunistic scheduling algorithm wireless communication systems Interference MIMO Receivers Scheduling Scheduling algorithms Signal to noise ratio Upper bound

来源：评论

学校读者我要写书评

暂无评论

Theories of Social Media： Philosophical Foundations

引用

Engineering 2018年第1期4卷 94-102页

作者： Jiayin Qi Emmanuel Monod Binxing Fang Shichang Deng School of Management Shanghai University of International Business and Economics Shanghai 201620 China Institute of Artificial Intelligence and Change Management Shanghai University of International Business and Economics Shanghai 200336 China Institute of Cyberspace Advanced Technology Guangzhou University Guangzhou 510006 China China Electronics Corporation Beijing 100082 China Key Laboratory of Trustworthy Distributed Computing and Service of Ministry of Education Belting University of Posts and Telecommunications Beijing 100876 China

Although many different views of social media coexist in the field of information systems （IS）, such the- ories are usually not introduced in a consistent framework based on philosophical foundations, This paper introduces the dimensions of lifeworld and consideration of others, The concept of lifeworld includes Descartes＇ rationality and Heidegger＇s historicity, and consideration of others is based on instru- mentalism and Heidegger＇s ＂being-with,＂ These philosophical foundations elaborate a framework where different archetypal theories applied to social media may he compared： Goffman＇s presentation of sell Bourdieu＇s social capital, Sartre＇s existential project, and Heidegger＇s ＂shared-world,＂ While Goffman has become a frequent reference in social media, the three other references are innovative in IS research, The concepts of these four theories of social media are compared with empirical findings in IS literature, While some of these concepts match the empirical findings, some other concepts have not yet been inves- tigated in the use of social media, suggesting future research directions,

关键词： Social media Lifeworld Consideration of others Rationality Historicity lnstrumentalism Being-with Presentation of self

来源：评论

学校读者我要写书评

暂无评论

Self-learn to Explain Siamese Networks Robustly

Self-learn to Explain Siamese Networks Robustly

引用

IEEE International Conference on Data Mining (ICDM)

作者： Chao Chen Yifan Shen Guixiang Ma Xiangnan Kong Srinivas Rangarajan Xi Zhang Sihong Xie Lehigh University BUPT Key Laboratory of Trustworthy Distributed Computing and Service (MoE) University of Illinois at Chicago Worcester Polytechnic Institute

ISBN: (纸本)9781665423991

Learning to compare two objects are essential in applications, especially when labeled data are scarce and imbalanced. As these applications can involve humans and make high-stake decisions, it is critical to explain the learned models. We aim to study post-hoc explanations of Siamese networks (SN) widely used in learning to compare. We characterize the instability of gradient-based explanations due to the additional compared object in SN, in contrast to architectures with a single input instance. We optimize for global invariance based on unlabeled data using self-learning to promote the stability of local explanations for individual input. The invariance leads to constrained optimization problems that can be solved using gradient descent-ascent (GDA), or KL-divergence regularized unconstrained optimization solved by SGD. We provide convergence proofs when the objective functions are nonconvex due to the Siamese architecture. Results on tabular and graph data from neuroscience and chemical engineering show that our local explanations robustly respects the self-learned invariance while optimizing the explanation faithfulness and simplicity. We further demonstrate the convergence of GDA experimentally.

关键词： Neuroscience Conferences Chemical engineering Linear programming Stability analysis Robustness Data mining

来源：评论

学校读者我要写书评

暂无评论

TOA Estimation Using Checking Window for IR-UWB Energy Detection Receivers

TOA Estimation Using Checking Window for IR-UWB Energy Detec...

引用

IEEE Vehicular Technology Conference

作者： Hong Cai Tiejun Lv Hui Gao Anzhong Hu Key Laboratory of Trustworthy Distributed Computing and Service Ministry of Education School of Information and Communication Engineering Beijing University of Posts and Telecommunications

ISBN: (纸本)9781479944811

Precise ultra-wideband (UWB) ranging requires accurate estimation of time of arrival (TOA). In this paper, a novel TOA estimation approach using checking window is proposed for energy detection (ED) receivers in dense multipath channels. Unlike the traditional methods that treat the multipath components (MPCs) as interference sources, the proposed scheme exploits the MPCs to consolidate the detection of the first path (FP). By detecting dense threshold-crossing (TC) events over successive energy samples with the checking window, the MPCs are collected, and the false TC events that sparsely distributed in the noise region can be recognized and neglected for the FP detection. As a result, the early false detection is reduced and the leading edge detection is improved. Simulations demonstrate the effectiveness and robustness of the proposed scheme in IEEE 802.15.4a channels.

关键词： edge detection radio receivers time-of-arrival estimation ultra wideband communication IEEE 802.15.4a channels IR-UWB energy detection receivers MPC TOA estimation checking window false detection multipath components noise region time of arrival estimation ultrawideband ranging Distance measurement Image edge detection Receivers Scattering Signal to noise ratio Time of arrival estimation time-of-arrival estimation Edge detection Ultra wideband communication signal to noise ratios distance measurement Receivers radio receivers Maximum Allowable Concentration Scattering

来源：评论

学校读者我要写书评

暂无评论

Secure transmission with artificial noise in heterogeneous massive MIMO network 1st

Secure transmission with artificial noise in heterogeneous m...

引用

1st International Congress on Signal and Information Processing, Networking and Computers, ICSINC 2015

作者： Li, Chang Sun, Songlin Liu, Wei Huang, Hai School of Information and Communication Engineering Key Laboratory of Trustworthy Distributed Computing and Service Ministry of Education Beijing University of Posts and Telecommunications Beijing China Department of Network and Platform M2M & Internet of Things Institute China Mobile Research Institute Beijing China

ISBN: (纸本)9781138028814

Heterogeneous Network (HetNet) is a promising technology to improve the capacity of future generations of cellular network, in which a mobile station can be served by multiple Base Stations (BSs) with different scales of coverage range, including short range Low Power Nodes (LPNs). In this paper, we study security provisioning in heterogeneous massive Multiple-Input–Multiple-Output (MIMO) systems. Specifically, we consider secure downlink transmission in a massive MIMO system with Matched-Filter (MF) precoding and Artificial Noise (AN) generation at the BS, and transmit the signal to the MT through the LPN in the presence of a passive multi-antenna eavesdropper. Thereby, we consider an AN shaping matrix, where the AN is transmitted in the null-space of the matrix formed by all MT channels. Our analytical and numerical results reveal that, in massive MIMO systems employing MF precoding and AN generation, the Signal-to- Interference-and Noise Ratio (SINR) of intended MTs in LPNs is higher than eavesdropper, we can also obtain the positive secrecy capacity which prove this method can guarantee the secure transmission. © 2016 Taylor & Francis Group, London.

关键词： Heterogeneous networks

来源：评论

学校读者我要写书评

暂无评论

On using game theory to rate allocation in joint source-channel coding

On using game theory to rate allocation in joint source-chan...

引用

International Symposium on Communications and Information Technologies (ISCIT)

作者： Teng Li Yaoyao Guo Tiantian Ran Songlin Sun School of Information and Communication Engineering Key Laboratory of Trustworthy Distributed Computing and Service (BUPT) Ministry of Education Beijing University of Posts and Telecommunications

ISBN: (纸本)9781479944156

In Joint source-channel coding (JSCC), the source coding improves coding efficiency, while channel coding improves transmission reliability. Due to channel capacity is limited in video transmission, allocation bandwidth between source and channel needs a tradeoff in order to achieve optimum effect of transmission. In this paper, cooperative game theory is used in the part of allocation rate in the JSCC model, and convert it into a static Nash bargaining issues, then solve the Nash equilibrium results. This method makes full use of the channel resources, and optimizes the quality of the video.

关键词： Channel coding Resource management Source coding Joints Bandwidth Games

来源：评论

学校读者我要写书评

暂无评论

Generalized likelihood ratio test multiple-symbol detection for MIMO-UWB: A semidefinite relaxation approach

Generalized likelihood ratio test multiple-symbol detection ...

引用

IEEE Conference on Wireless Communications and Networking

作者： Chanfei Wang Tiejun Lv Hui Gao Anzhong Hu Yueming Lu Key Laboratory of Trustworthy Distributed Computing and Service Beijing University of Posts and Telecommunications Beijing China Singapore University of Technology and Design Singapore

ISBN: (纸本)9781479930845

In this paper, semidefinite relaxation (SDR) technology is exploited for the multiple-symbol detection (MSD) over the multiple-input multiple-output (MIMO) ultra-wideband (UWB) systems. The existing scheme generalized likelihood ratio test (GLRT) MSD jointly detect multiple symbols, however, it entails a complexity of O(2 M ), where M is the observation window size. To this end, SDR is employed to reformulate the GLRT detection into a semidefinite programming (SDP) model, and two detectors, randomization-SDR (RSDR) and eigenvector-SDR (ESDR) are proposed on the order of O(M 3.5 ) and O(M 3 ), respectively. Complexity analysis validates that the SDR-MSD strategy is desirable owing to its reduced complexity, compared with the exponential-complexity sphere decoding (SD) MSD. Furthermore, Monte-Carlo simulations demonstrate that the proposed SDR detectors provide the bit error rate (BER) performance almost the same with that of the SD method, and the RSDR outperforms the ESDR at the price of slightly higher complexity.

关键词： Complexity theory Detectors Bit error rate Transmitting antennas Matrix converters Receiving antennas Optimization

来源：评论

学校读者我要写书评

暂无评论

Experimental demonstration of a quantum downstream access network in continuous variable quantum key distribution with a local local oscillator

引用

Photonics Research 2024年第6期12卷 1262-1273页

作者： DENGKE QI XIANGYU WANG ZHENGHUA LI JIAYU MA ZIYANG CHEN YUEMING LU SONG YU State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing 100876China Key Laboratory of Trustworthy Distributed Computing and Service(MoE) Beijing University of Posts and TelecommunicationsBeijing 100876China State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronicsand Center for Quantum Information TechnologyPeking UniversityBeijing 100871China

Quantum networks provide opportunities and challenges across a range of intellectual and technical frontiers,including quantum computation,communication,and *** traditional communication networks,quantum networks utilize quantum bits rather than classical bits to store and transmit *** key distribution(QKD)relying on the principles of quantum mechanics is a key component in quantum networks and enables two parties to produce a shared random secret key,thereby ensuring the security of data *** this work,we propose a cost-effective quantum downstream access network structure in which each user can get their corresponding key information through terminal *** on this structure,we demonstrate the first four-end-users quantum downstream access network in continuous variable QKD with a local local *** contrast to point-to-point continuous variable QKD,the network architecture reevaluates the security of each user and accounts for it accordingly,and each user has a lower tolerance for excess noise as the overall network expands with more ***,the feasibility of the experiment is based on the analysis of the theoretical model,noise analysis,and multiple techniques such as the particle filter and adaptive equalization algorithm used to suppress excess *** results show that each user can get a low level of excess noise and can achieve secret key rates of 546 kbps,535 kbps,522.5 kbps,and 512.5 kbps under a transmission distance of 10 km,respectively,with the finite-size block of 1×10~*** not only verifies the good performance but also provides the foundation for the future multi-user quantum downstream access networks.

关键词： quantum oscillator local

来源：评论

学校读者我要写书评

暂无评论

Improving Chinese Spelling Check by Character Pronunciation Prediction: The Effects of Adaptivity and Granularity

Improving Chinese Spelling Check by Character Pronunciation ...

引用

2022 Conference on Empirical Methods in Natural Language Processing, EMNLP 2022

作者： Li, Jiahao Wang, Quan Mao, Zhendong Guo, Junbo Yang, Yanyan Zhang, Yongdong University of Science and Technology of China Hefei China MOE Key Laboratory of Trustworthy Distributed Computing and Service Beijing University of Posts and Telecommunications Beijing China People's Daily Online Co. Beijing China People's Public Security University of China Beijing China

Chinese spelling check (CSC) is a fundamental NLP task that detects and corrects spelling errors in Chinese texts. As most of these spelling errors are caused by phonetic similarity, effectively modeling the pronunciation of Chinese characters is a key factor for CSC. In this paper, we consider introducing an auxiliary task of Chinese pronunciation prediction (CPP) to improve CSC, and, for the first time, systematically discuss the adaptivity and granularity of this auxiliary task. We propose SCOPE which builds on top of a shared encoder two parallel decoders, one for the primary CSC task and the other for a fine-grained auxiliary CPP task, with a novel adaptive weighting scheme to balance the two tasks. In addition, we design a delicate iterative correction strategy for further improvements during inference. Empirical evaluation shows that SCOPE achieves new state-of-the-art on three CSC benchmarks, demonstrating the effectiveness and superiority of the auxiliary CPP task. Comprehensive ablation studies further verify the positive effects of adaptivity and granularity of the task. Code and data used in this paper are publicly available at https://***/jiahaozhenbang/SCOPE. © 2022 Association for Computational Linguistics.

关键词： Computational linguistics

来源：评论

学校读者我要写书评

暂无评论

Air-Decoding: Attribute Distribution Reconstruction for Decoding-Time Controllable Text Generation

arXiv

引用

arXiv 2023年

作者： Zhong, Tianqi Wang, Quan Han, Jingxuan Zhang, Yongdong Mao, Zhendong University of Science and Technology of China China MOE Key Laboratory of Trustworthy Distributed Computing and Service Beijing University of Posts and Telecommunications China

Controllable text generation (CTG) aims to generate text with desired attributes, and decoding-time-based methods have shown promising performance on this task. However, in this paper, we identify the phenomenon of Attribute Collapse for the first time. It causes the fluency of generated text to rapidly decrease when the control strength exceeds a critical value, rendering the text completely unusable. This limitation hinders the effectiveness of decoding methods in achieving high levels of controllability. To address this problem, we propose a novel lightweight decoding framework named Air-Decoding. Its main idea is reconstructing the attribute distributions to balance the weights between attribute words and non-attribute words to generate more fluent text. Specifically, we train prefixes by prefix-tuning to obtain attribute distributions. Then we design a novel attribute distribution reconstruction method to balance the obtained distributions and use the reconstructed distributions to guide language models for generation, effectively avoiding the issue of Attribute Collapse. Experiments on multiple CTG tasks prove that our method achieves a new state-of-the-art control performance. Copyright © 2023, The Authors. All rights reserved.

关键词： Decoding

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：