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检索条件"机构=Key Laboratory of Trustworthy Distributed Computing and Service"

共 518 条记录，以下是441-450 订阅

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Low-Complexity Multiuser MIMO Downlink User Selection Based on Large-Scale Fading

Low-Complexity Multiuser MIMO Downlink User Selection Based ...

引用

IEEE Vehicular Technology Conference

作者： Haijing Liu 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)9781479944484

We propose a low-complexity user selection scheme with zero-forcing precoding in multiuser MIMO downlink systems, where the base station (BS) is equipped with large-scale antenna arrays and the number of candidate-users is relatively small. The BS obtains the channel state information (CSI) of the user equipments (UEs) through the pilot-based minimum mean-square error channel estimation. Taking both the channel propagation and the UE location distribution into consideration, we first derive a deterministic approximation of the ergodic sum rate and investigate the optimal number of active UEs, K~*, in the sense of sum rate maximization. Then, K~* UEs are selected for simultaneous data transmission according to their large-scale channel fading. Small-scale channel fading is not taken into account in the selection procedure, thus reducing the computational complexity dramatically as well as improving the robustness of the proposed scheme in practice. Numerical simulations suggest that whether perfect CSI is available at the BS, our proposed scheme achieves high sum rate performance with very low complexity.

关键词： Channel estimation Complexity theory MIMO Downlink Fading Vectors Antennas

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Outage Analysis of MIMO Multiuser Broadcast Scheduling with MMSE Receiver

Outage Analysis of MIMO Multiuser Broadcast Scheduling with ...

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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

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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

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

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

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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

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

Generalized likelihood ratio test multiple-symbol detection ...

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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

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An optimized first path detector for UWB ranging using error characteristics

An optimized first path detector for UWB ranging using error...

引用

IEEE Conference on Wireless Communications and Networking

作者： Hong Cai 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

The key of time of arrival (TOA) estimation in ultra wideband (UWB) ranging is to detect the first path (FP). In this paper, we propose an optimized FP detector with the adaptive threshold in the absence of prior channel state information (CSI). In particular, the error information (EI) set is introduced to guide the threshold adjustment and determine the TOA estimate with a novel iterative algorithm. The EI set captures the characteristics of major errors regarding the inappropriate threshold. After the iterative process, the proposed scheme is shown to achieve the asymptotic optimal threshold without large number of repeated pulses. Therefore, the proposed scheme efficiently improves the TOA estimation accuracy as compare to the traditional schemes. Simulation results validate the effectiveness and superiority of the proposed scheme.

关键词： error analysis iterative methods time-of-arrival estimation ultra wideband technology wireless channels CSI EI set TOA estimation UWB ranging adaptive threshold asymptotic optimal threshold channel state information error characteristic error information iterative process algorithm optimized FP detector optimized first path detector threshold adjustment time of arrival estimation ultrawideband ranging

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WORD distributed REPRESENTATION BASED TEXT CLUSTERING

WORD DISTRIBUTED REPRESENTATION BASED TEXT CLUSTERING

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2014 IEEE 3rd International Conference on Cloud computing and Intelligence Systems

作者： Shan Feng Ruifang Liu Qinlong Wang Ruisheng Shi School of Information and Communication Engineering BUPT Education Ministry Key Laboratory of Trustworthy Distributed Computing and Service BUPT School of Humanities BUPT

The fast growth of Internet web documents has posed new challenges on how to efficiently and accurately manage and retrieve the textual collections,text clustering plays a significant *** document clustering is an unsupervised categorization of a given document collection based on vector space model,which is a high sparse *** this paper,we propose a means to fight the existing shortcomings with a word vector in distributed representation which is obtained from a neural probabilistic language *** improve the representation of document vector and enhance the accuracy of text clustering,we first computing semantic similarities between words using word embedded vector,and then expanding the keywords of each *** experiment results show the method can improve the accuracy of clustering.

关键词： Word distributed representation keyword extension NMF

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Epdemic spreading model based overlapping community detection

Epdemic spreading model based overlapping community detectio...

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International Conference on Advances in Social Network Analysis and Mining, ASONAM

作者： Ying Wen Yuanhao Chen Xiaolong Deng International School Beijing University of Posts and Telecommunications China Key Laboratory of Trustworthy Distributed Computing and Service Beijing University of Posts and Telecommunications China

Community detection in inhomogeneous structured network is an attractive research problem that searches for methods to discover groups in which individuals are more densely interconnected with each other with higher probability of internal information propagation. While most of the previous approaches attempt to divide networks into communities according to the algorithm results of network or edge measurement, Label Propagation Algorithm (LPA) adopts semi-supervised machine learning and implements community detection in an intelligent way with the automatic convergent process of network entity label iteration. In this work, we study the early community detection approaches, explore the low efficacy and stagnant converging rate of LPA in its response to network with overlapped communities, and propose a new approach for community detection using epidemic spreading virus to discover groups with super positioned members. Extensive experiments in synthetic signed network and real-life large networks derived from Internet social media are conducted to explore the optimal mechanism of the most suitable community-detecting virus infection.

关键词： Communities Social network services Kernel Media Mathematical model Educational institutions Conferences

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A method based on MD5 and time for preventing deception in electronic commerce

A method based on MD5 and time for preventing deception in e...

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International Conference on Cyberspace Technology (CCT 2014)

作者： Zhenggang Hu Yueming Lu School of Information and Communication Engineering Beijing University of Posts and Telecommunications China Key Laboratory of Trustworthy Distributed Computing and Service (BUPT) Ministry of Education Beijing China

ISBN: (纸本)9781510802704

Aiming at reducing the risk of data being intercepted and preventing deceptions in the electronic commerce, this paper proposes a method based on MD5 and time which can effectively prevent the deception in data transmission. The method uses the traditional MD5 algorithm to encrypt and validate important data, then verifying the validity and legitimacy of the data by using time.

关键词： electronic commerce md5 algorithm preventing deception time electronic commerce MD5 MD5 algorithm Deception data transmission Legitimacy

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Detecting the run time attacks in the cloud with an evidence collection based approach

Detecting the run time attacks in the cloud with an evidence...

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IEEE International Conference on Cloud computing and Intelligence Systems (CCIS)

作者： Jie Lin Chuanyi Liu Zhichun Ning Binxing Fang School of Computer Science Beijing University of Posts and Telecommunications Beijing China Ministry of Education Key Laboratory of Trustworthy Distributed Computing and Service (BUPT) Beijing China

ISBN: (纸本)9781467369541

As the impacts of security threats are amplified and spread quickly in the cloud, especially with the attribute of large-scale virtualization. Most of researches focus on monitoring the network traffic. However, these methods don't check how the attack happened and what damage the attack caused for the virtual infrastructure. This paper presents a logging method to analyze the potential attacks out of VM and a prototype was implemented. The experimental results show that this method can detect the real world attacks effectively and the performance overhead is acceptable.

关键词： Monitoring Software Servers Virtualization Virtual machining Binary codes Computer architecture

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