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Joint relay transmit-receive antenna selection and opportunistic source selection strategy for full-duplex relaying

Joint relay transmit-receive antenna selection and opportuni...

引用

International Conference on Telecommunications (ICT)

作者： Rongsheng Li Hui Gao Wei Long Tiejun Lv Key Laboratory of Trustworthy Distributed Computing and Service Beijing University of Posts and Telecommunications Beijing China

In this paper, we investigate a cooperative relay network where two users exchange messages through a full-duplex relay. A joint relay transmit-receive antenna selection and opportunistic source selection (RAS-OSS) strategy is proposed to improve the performance of the full-duplex relay network, when the roles of the antennas at the full-duplex relay are not predefined. Both of the amplify-and-forward (AF) and decode-and-forward (DF) protocols are considered at the relay. Asymptotic approximations of average transmission rate and outage probability are derived to evaluate the performance of the network when the RAS-OSS strategy is adopted. Both analytical and numerical results reveal that the asymptotic approximations are tight in high signal-to-noise ratio regime and the RAS-OSS strategy improves the performance of the network under both AF and DF protocols.

关键词： Protocols Relay networks (telecommunications) Transmitting antennas Signal to noise ratio Approximation methods Telecommunications

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The analysis and implementation of AllJoyn based Thin Client communication system with heartbeat function

The analysis and implementation of AllJoyn based Thin Client...

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International Conference on Cyberspace Technology, CCT 2014

作者： Zheng, Kun Lv, Tiejun Li, Yonghua Lu, Yueming School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing China Key Laboratory of Trustworthy Distributed Computing and Service BUPT Ministry of Education Beijing China Key Lab. of Universal Wireless Communications BUPT Ministry of Education Beijing China

ISBN: (纸本)9781849199285

The interconnection of heterogeneous networks becomes a bottleneck in the development of the IoT. The birth of AllJoyn is just to solve this problem. At the same time, embedded devices with a specific function or a small number of functions occupy a large proportion in the IoT, how to achieve interconnection with resource limited devices becomes very important. In this paper, we divide the AllJoyn based IoT devices into two parts, one is AllJoyn Standard Client (AJSC) and the other is AllJoyn Thin Client (AJTC). We will compare AJTC with AJSC in AllJoyn distributed bus, communication flow and their architecture. This paper also points out the problem in AllJoyn thin client communication, and proposes a heartbeat mechanism for devices with online detection. Finally, we achieve the interconnection between AJTC and AJSC in a system prototype.

关键词： Heterogeneous networks

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An android-based approach for automatic unit test

An android-based approach for automatic unit test

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International Conference on Cyberspace Technology, CCT 2014

作者： Liu, Yanmei Lu, Yueming Li, Yonghua School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing China Key Laboratory of Trustworthy Distributed Computing and Service BUPT Ministry of Education Beijing China Key Lab. of Universal Wireless Communications BUPT Ministry of Education Beijing China

ISBN: (纸本)9781849199285

Unit test is the first stage in the V-Model and the foundation of software test. By means of integrating Android JUnit, a testing tool, into a continuous integration platform named Jenkins, this paper proposes a fully automated unit test approach. The approach can generate a visual test report for Android projects. This achievement can significantly increase the efficiency of multiple unit tests, and thus enable engineers to deliver their software products to the end users as soon as possible.

关键词： Integration testing

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A centralized home gateway architecture based on the analysis of user log

A centralized home gateway architecture based on the analysi...

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International Conference on Cyberspace Technology, CCT 2014

作者： Qi, Lei Lu, Yueming Li, Yonghua School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing China Key Laboratory of Trustworthy Distributed Computing and Service BUPT Ministry of Education Beijing China Key Lab. of Universal Wireless Communications BUPT Ministry of Education Beijing China

ISBN: (纸本)9781849199285

Under the influence of the Internet, the household electronics are showing a trend of instrumentation. The utilization of IOT (Internet of Things) technology realizes the interconnection among electronics in the home environment, which leads to the emergence of home network. Home gateway is not only the core of home network, but also the control hub of household electronics. This paper proposes a centralized home gateway architecture based on the analysis of user log. This architecture makes it possible to provide personalized information services for users by collecting, storing and analysing user log. This architecture is evaluated by experiments conducted in a simulative home network and has a better performance in terms of UE (User Experience).

关键词： Home networks

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Binary-decision-tree-based multiclass Support Vector Machines

Binary-decision-tree-based multiclass Support Vector Machine...

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International Symposium on Communications and Information Technologies (ISCIT)

作者： Song Xue Xiaojun Jing Songlin Sun Hai Huang School of Information and Communication Engineering China Key Laboratory of Trustworthy Distributed Computing and Service (BUPT) Ministry of Education Beijing China

ISBN: (纸本)9781479944156

In this paper, we propose Support Vector Machine classifiers utilizing binary decision tree to solve multiclass problems. In training process, we determine the hyperplane that separates the classes into two categories at the top node and this procedure is repeated until only one class remains. In order to obtain higher accuracy, easier separable class should be separated in the upper node. Hence a decision tree is constructed according to the degree of difficulty to classify classes which is measured by Euclidean distance and standard deviation. The proposed binary decision tree SVM is designed to obtain superior performance in classification accuracy and speed. Its performance is measured on the dataset of Sogou news corpus which has eight classes of news. The method is compared with some traditional methods like one-against-one and one-against-all. The results of the experiments indicate that it has comparative accuracy with other traditional methods and much faster recognition speed.

关键词： Support vector machines Decision trees Training Testing Euclidean distance Accuracy Buildings

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Improving Secrecy Outage Probability with Symbol Extension

Improving Secrecy Outage Probability with Symbol Extension

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IEEE Vehicular Technology Conference

作者： Cong Zhang Tiejun Lv Ruohan Cao Hui Gao 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

This paper reveals symbol extension is capable of improving secrecy performance in the multiple-input single-output (MISO) wiretap channel. We propose a symbol extension scheme jointly with the existing beamforming and artificial noise generation strategy to exploit the time variation of fading channel. After multiplying the data symbol vector by a proper designed square matrix, the data symbol can be extended to multiple time-slots. As a result, without any symbol rate loss, the proposed scheme enhances the secrecy performance in terms of secrecy outage probability. Furthermore, we also analyze the asymptotic secrecy outage probability and derive the achievable diversity order. Both analytical and numerical results show that the proposed scheme can bring more diversity gains into secrecy communication.

关键词： Secrecy outage probability Artificial noise Diversity order Symbol extension

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Blind Interference Neutralization in 3-Cell Interference Channel with Shared Relay

Blind Interference Neutralization in 3-Cell Interference Cha...

引用

IEEE Vehicular Technology Conference

作者： Ou Bai Tiejun Lv Hui Gao 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

In this paper, a novel scheme called blind interference neutralization is provided in the 3-cell interference channel with a shared instantaneous relay. The shared relay not only receives signals from sources, but also sends signals to destinations with a processing matrix. With the proposed scheme, each destination is able to pick up its own desired signal without encountering inter-user interference (IUI). In particular, the sources are blind in the sense that no channel state information (CSI) is required for transmit beamforming. Numerical simulation shows that the proposed scheme, compared with others, can increase the sum rate performance.

关键词： array signal processing cellular radio matrix algebra radiofrequency interference relay networks (telecommunication) wireless channels 3-cell interference channel blind interference neutralization numerical simulation processing matrix shared instantaneous relay transmit beamforming Antennas Array signal processing Equations Interference channels Relays Vectors

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Tight Semidefinite Relaxation for Combinatorial Optimization in UWB Multiuser Detection Systems

Tight Semidefinite Relaxation for Combinatorial Optimization...

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IEEE Vehicular Technology Conference

作者： Chanfei Wang 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

In this paper, two near-optimal detectors based on the convex optimization algorithm are proposed for multiuser detection (MUD) in the ultra-wide bandwidth (UWB) systems. The first detector performs semidefinite relaxation (SDR) to approximate the optimum multiuser detection (OMD) which is a nondeterministic polynomial time hard (NP-hard) problem. When the cutting planes generation algorithm is employed to strengthen the relaxation of the SDR, a tight MUD detector for combinatorial optimization is obtained by adding triangle inequalities to the well-known SDR in strict feasible region. Simulations demonstrate that the semidefinite programming (SDP) approaches can provide bit error rate (BER) performance close to the OMD efficiently using the interior point method, and the tight detector provides a better BER performance than the previous detector with a slightly higher complexity.

关键词： combinatorial mathematics computational complexity error statistics mathematical programming multiuser detection relaxation ultra wideband communication BER MUD detector NP-hard problem OMD SDP SDR UWB multiuser detection systems bit error rate combinatorial optimization convex optimization algorithm generation algorithm near-optimal detectors nondeterministic polynomial time hard problem optimum multiuser detection semidefinite programming semidefinite relaxation ultra-wide bandwidth systems Bit error rate Complexity theory Detectors Multiuser detection Optimization Programming Vectors Bit error rate Multiuser detection SDPR gene OMD gene combinatorial mathematics Nondeterministic polynomial-time hard Ultra wideband communication service Discovery Protocol Optimization algorithms Complexity theory Programming complexity classes detector relaxation Relaxation

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A More Accurate Outage Analysis for ZF-Based MIMO AF Two-Way Relaying by Order Statistics

A More Accurate Outage Analysis for ZF-Based MIMO AF Two-Way...

引用

IEEE Vehicular Technology Conference

作者： Rongsheng Li Tiejun Lv Hui Gao 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

In this paper, a more accurate outage performance analysis is obtained by employing order statistics for multiple-input multiple-out two-way relay system with joint transmit/receive zero-forcing. Furthermore, closed-form upper and lower bounds are first derived for the overall outage probability when there exist spatial correlations at the relay. Analysis and simulation results indicate that the upper bound derived with order statistics is tight under various spatial correlations at the relay, and it is also tighter than that derived by eigenvalues of Wishart matrices over independent identically distributed Rayleigh fading channel. For example, when the relay is equipped with 4, 6 and 8 antennas, the upper bounds derived with order statistics are 2dB, 3dB and 4dB tighter than those with eigenvalues, respectively. In particular, when the numbers of antennas equipped at the users are greater than that equipped at the relay, the derived upper bound is nearly identical to the exact results.

关键词： MIMO communication Rayleigh channels antenna arrays eigenvalues and eigenfunctions higher order statistics matrix algebra probability relay networks (telecommunication) Wishart matrices ZF-based MIMO AF two-way relaying outage analysis antennas closed-form upper bounds eigenvalues independent identically distributed Rayleigh fading channel joint transmit-receive zero-forcing lower bounds multiple-input multiple-out two-way relay system outage performance analysis outage probability spatial correlations Fading Joints MIMO Probability Relays Signal to noise ratio Upper bound Higher order statistics relay Upper bound Raleigh fading channels ANTENNA signal to noise ratios MIMO communication Eigenfunctions Lower bound eigenvalues multiple input multiple output systems matrix algebra Antenna arrays fading color Joints

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A NOVEL NETWORK BASED ON TD-LTE FOR COUNTER-TERRORISM EMERGENCY COMMUNICATION IN URBAN AREA

A NOVEL NETWORK BASED ON TD-LTE FOR COUNTER-TERRORISM EMERGE...

引用

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

作者： Xue Liu Xiaojun Jing Songlin Sun Hai Huang School of Information and Communication Engineering Beijing University of Posts and Telecommunications Key Laboratory of Trustworthy Distributed Computing and ServiceMinistry of Education

It is believed that effective communications are important to a successful response to emergency ***,when a terrorist attack happens,the ability to share multimedia information promptly and directly affects the ability to fight terrorists and save *** this paper,a novel network which is based on TD-LTE is designed for counter-terrorism emergency communication in urban *** the description of the architecture of the TD-LTE CECN,this paper mainly focuses on the process of accessing to the ***,an example of data flow is provided as well as a simulation to prove the performance of this *** the end of this paper,a political mechanism is discussed to fight terrorists effectively.

关键词： TD-LTE Emergency communication Counter-terrorism TD-LTE CECN

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