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检索条件"机构=Beijing Key Laboratory of Network System Architecture and Convergence"

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ADAPTIVE VISUAL SALIENCY DETECTION METHOD VIA HILBERT-HUANG SPECTRAL ANALYSIS

ADAPTIVE VISUAL SALIENCY DETECTION METHOD VIA HILBERT-HUANG ...

引用

IEEE International Conference on Multimedia and Expo Workshops

作者： H. Shaw Zhaoming Lu Xiangming Wen Jie Cheng Luhan Wang Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

ISBN: (纸本)9781479947164

Visual saliency is largely determined by bottom-up factors that highlight image regions which are different from their surroundings. Based on the philosophy that exploits image information content as the metric of visual saliency, an adaptive visual saliency detection method (AVSDM) including Pixel Cluster, multi-scale Gaussian Pyramid Decomposition and Hilbert-Huang Spectral Analysis is proposed to measure the bottom-up factors in this paper. Saliency map is detected via non-redundant information based on shannon entropy theory. The method has a good performance in adaptively detecting tiny details as well as objects with complex background. Experiment results indicate that the proposed approach outperforms the state-of-the-art detection algorithms.

关键词： Visual saliency Hilbert-Huang transform 2D-EMD Pixel clustering Gaussian Pyramid Decomposition

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Coverage Optimization for Dense Deployment Small Cell Based on Ant Colony Algorithm

Coverage Optimization for Dense Deployment Small Cell Based ...

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IEEE Vehicular Technology Conference

作者： Rui Han Chunyan Feng Hailun Xia Yaguang Wu Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

ISBN: (纸本)9781479944484

Dense deployment of small cell in heterogeneous networks (HetNet) is considered as a promising way to cope with the exponential growth in mobile traffic demand. In such scenario, coverage optimization is a challenge due to the unplanned deployment and plug-and-play feature of small cell. In this paper, the coverage performance of the network is analyzed under different deployment density of small cells. Then the coverage problem is modeled as a cost function which includes the inappropriate coverage ratio of the network. After that, the ant colony algorithm (ACA) is applied to find the optimal pilot Tx power of each small cell through the minimization of the cost function. Finally, compared to the fixed coverage scheme, the proposed algorithm can not only reduce the ratio of coverage hole but also the proportion of coverage overlap as well.

关键词： Coverage Optimization Small cell networks Ant colony algorithm

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ADAPTIVE BIT ALLOCATION SCHEME FOR COMP system WITH DELAYED LIMITED FEEDBACK

ADAPTIVE BIT ALLOCATION SCHEME FOR COMP SYSTEM WITH DELAYED ...

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2014 4th IEEE International Conference on network Infrastructure and Digital Content

作者： Shi Lei Hu Zhirui Zhang Tiankui Zeng Zhimin Beijing University of Posts and Telecommunications Beijing Key Laboratory of Network System Architecture and Convergence

Per-cell codebook based limited feedback technique in coordinated multi-point transmission(Co MP) system has received more and more attention due to its flexibility and scalability. In a practical system, as the capacity of backhaul links and the bandwidth of the feedback channels are finite, there exists channel state information(CSI) delay. In this paper, we study the bit allocation problem considering CSI delay in multi-cell joint transmission system based on Gauss-Markov temporal correlation channel model. We first analyze the global channel direction information(CDI) quantization accuracy of the users and give the approximate closed-form expression of the normalized global CDI quantization gain, we then propose an adaptive bit allocation scheme to allocate bits between quantizing the per-cell CDIs and the per-cell PAs(phase ambiguity) under the total number of feedback bits constraint, aiming at maximizing the normalized average global CDI quantization gain. Simulation results show that the proposed bit allocation scheme significantly improves the average sum-rate of the Co MP system compared with the conventional equal bit allocation scheme.

关键词： comp system,limited feedback,CSI delay.bit allocation

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Coordinated Scheduling in Downlink Multi-cell OFDMA networks

Coordinated Scheduling in Downlink Multi-cell OFDMA Networks

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IEEE Vehicular Technology Conference

作者： Ling Zhang Xiangming Wen Ting Xu Zhaoming Lu Jun Zhao Shenghua He Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

ISBN: (纸本)9781479944484

In this paper, we propose a coordinated scheduling scheme in downlink multi-cell Orthogonal Frequency Division Multiplexing Access (OFDMA) networks. Firstly, a novel decision tree algorithm is introduced to categorize users according to certain attribute parameters to improve system performance. To suppress inter-cluster interference, a filter is used at the receive. To mitigate intra-cluster interference and enhance system performance, we jointly form precoding matrix (using Block Diagonalization precoding) and distribute power for coordinative users. Considering the fact that there is a constraint on number of coordinative users simultaneously served on one resource slot and there may be a large number of users needing coordinative transmission, it is necessary to allocate proper resource slots to them, seeking a tradeoff between coordinative user sum rate and system total capacity. Thus, a performance-based slot distribution is utilized. What needs to be pointed out is that our power control is a per BS power constraint. Simulation results show that our proposed scheme can significantly improve the performance of multi-cell networks.

关键词： Decision trees Interference Wireless communication Downlink Resource management system performance Receiving antennas

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REAL-TIME ANOMALY TRAFFIC MONITORING BASED ON DYNAMIC K-NN CUMULATIVE-DISTANCE ABNORMAL DETECTION ALGORITHM

REAL-TIME ANOMALY TRAFFIC MONITORING BASED ON DYNAMIC K-NN C...

引用

2014 IEEE 3rd International Conference on Cloud Computing and Intelligence systems

作者： Ruoning Song Fang Liu Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

In recent years,the scale of mobile Internet is rapidly increasing because of the explosive growing of smartphone users and *** traffic analysis and anomaly detection become critical for mobile *** to now,there are a number of studies for detecting anomaly network ***,the way of detecting anomalies on massive traffic data in real-time manner is not well *** this paper,we propose a real-time anomaly detection method based on dynamic k-NN cumulative-distance abnormal detection *** also present the design and implementation of the method by leveraging Strom,a distributed steam computing *** results from evaluation by real-world dataset show that our system is a promised solution for real-time anomaly detection solution in high-speed network.

关键词： Anomaly network traffic detection dynamic k-NN cumulative-distance abnormal detection algorithm real-time Storm cloud computing

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A REAL-TIME TOP-K QUERY ALGORITHM AND PARAL LELIZED IMPLEMENTATION

A REAL-TIME TOP-K QUERY ALGORITHM AND PARAL LELIZED IMPLEMEN...

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2014 IEEE 3rd International Conference on Cloud Computing and Intelligence systems

作者： Yao Lu Jun Liu Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

The analysis of data streams is of great value in many fields such as network monitoring and sensor *** a common operation,top-k query over data stream is the basis and core of other problems in data stream *** this paper,we introduce a parallel algorithm based on Frequent algorithm and implement it by utilizing Apache ***,we evaluate the algorithm by estimated error under various situations and show that the algorithm can effectively improve the precision of top-k query by adjusting the parallel *** parallelized implementation is of significance in network traffic monitoring.

关键词： Parallel algorithm Top-k query Apache Storm

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Spatial Throughput Characterization in Cognitive Radio networks with Primary Receiver Assisted Carrier Sensing Based Opportunistic Spectrum Access

Spatial Throughput Characterization in Cognitive Radio Netwo...

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IEEE Global Communications Conference

作者： Xiaoshi Song Changchuan Yin Danpu Liu Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

ISBN: (纸本)9781479935130

This paper studies the opportunistic spectrum access (OSA) of secondary users in large-scale overlay cognitive radio (CR) networks. Particularly, a two-phase carrier sensing based protocol, namely the primary receiver assisted carrier sensing (PRA-CS) protocol, is investigated. Under the PRA-CS protocol, a secondary transmitter (ST) is allowed to transmit only if it satisfies the interference constraint at all the active primary receivers (PRs) and has the minimum back-off timer among its secondary contenders. It is worth noting that under the PRA-CS protocol, due to the fact that the activation of STs relies on the spatial realizations of both the primary and secondary networks, even the first order moment measure (average density) of the point process formed by the active STs can not be exactly characterized. To tackle this new difficulty, approximations are made on the conditional distributions of the eligible STs as well as the active STs given a typical primary/secondary receiver (PR/SR) activated at the origin. Based on such approximations, the coverage (transmission non-outage) performance of the primary/secondary network under the proposed PRA-CS protocol is characterized. Simulations are provided to validate our analysis.

关键词： carrier sense multiple access cognitive radio protocols radio receivers radio transmitters OSA PRA-CS protocol ST cognitive radio networks interference constraint large-scale overlay cognitive radio opportunistic spectrum access primary receiver assisted carrier sensing protocols secondary transmitter two phase carrier sensing based protocol Approximation methods Cognitive radio Interference Protocols Receivers Sensors Throughput

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BLIND VIDEO QUALITY ASSESSMENT USING NATURAL VIDEO SPATIO-TEMPORAL STATISTICS

BLIND VIDEO QUALITY ASSESSMENT USING NATURAL VIDEO SPATIO-TE...

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IEEE International Conference on Multimedia and Expo Workshops

作者： Xiuyan Xia Zhaoming Lu Luhan Wang Mingfei Wan Xiangming Wen Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

ISBN: (纸本)9781479947164

In this paper, we propose a natural video statistics (NVS) based VQA model by making use of the measurable deviations in spatio-temporal statistical regularities. Both spatial and temporal statistical features in natural videos (NVS-S and NVS-T) are extracted and synthesized to get the video quality score. NVS-S is similar to what have been used in traditional NSS-based IQA or VQA in spatial domain. For NVS-T, we mainly study the distribution of motion residual DCT coefficients and the corresponding high frequency band energy ratio, which show great correlationship with video temporal distortions. The proposed blind VQA model is trained and tested in the LIVE database and EPFL-PoliMI database. The experimental results indicate that our model outperforms other blind VQAs.

关键词： Blind Video Quality Assessment Natural Video Statistics Discrete Cosine Transform Motion Residual Temporal Distortion

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Joint Coloring-based Resource Allocation and Power Reduction in Dense Small Cell networks

Joint Coloring-based Resource Allocation and Power Reduction...

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IEEE Vehicular Technology Conference

作者： Shie Wu Hailun Xia Zhimin Zeng Rui Han Xi Chen Wenqi Zuo Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

ISBN: (纸本)9781479944484

Deployment of small cells within macrocell layout is a promising approach to meet the rapid growth of traffic demand. Cell range expansion (CRE) has been introduced into LTE-Advanced to balance cell load. Small cell CRE users may suffer severe downlink (DL) co-tier and cross-tier interference introduced by dense deployment of small cells. In this paper, we propose a joint coloring-based resource allocation and power reduction scheme to mitigate interference to CRE users while maintaining the network throughput. In order to mitigate the co-tier interference, we firstly group CRE users based on interference graph by coloring and allocate orthogonal resources to different groups. Then, small base stations (SBSs) reduce power on resources occupied by CRE users in other SBSs. In order to alleviate the cross-tier interference, macro base stations (MBSs) power reduction is provided based on a utility function. We apply particle swarm optimization (PSO) strategy to obtain the optimal power. system level simulation results show that our proposed algorithm can greatly improve the CRE user throughput with slightly sacrificing the macrocell throughput. Meanwhile, it can improve the network energy efficiency (EE).

关键词： Small cells Interference mitigation Interference graph Coloring Resource allocation Power reduction

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Energy-Efficient Power Control with Time-Domain Scheduling in Heterogeneous networks

Energy-Efficient Power Control with Time-Domain Scheduling i...

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IEEE Vehicular Technology Conference

作者： Yaguang Wu Hailun Xia Chunyan Feng Rui Han Cong Du Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

ISBN: (纸本)9781479944811

Improving network Energy Efficiency (EE) in wireless communications has attracted increasing attention recently. The purpose of our research is to optimize the network power consumption and preserve the throughput of macrocells User Equipments (UEs) at the same time. We solve the problem by controlling the transmission power of macro base stations (BSs) in some subframes based on the proposed utility function, and accordingly scheduling picocells Cell Range Expansion (CRE) UEs in these subframes. The existence of the optimal solutions to the problem is discussed, then the Differential Evolution (DE) is applied to search the optimal transmission power which maximizes the proposed utility function. system level simulation results show that the proposed algorithm can not only optimize the network power consumption but also improve the throughput of the network, which will lead to the network EE improvement.

关键词： Energy efficiency Transmission power control Power consumption Time-domain scheduling

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