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

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BLIND VIDEO QUALITY ASSESSMENT USING NATURAL VIDEO SPATIO-TEMPORAL STATISTICS

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

引用

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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ANALYZING TRAFFIC CHARACTERISTICS BETWEEN BACKBONE networkS BASED ON HADOOP

ANALYZING TRAFFIC CHARACTERISTICS BETWEEN BACKBONE NETWORKS ...

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

作者： Dong Peng Yuanyuan Qiao Jie Yang Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

Nowadays,along with the development of mobile network,the network traffic is growing rapidly,including traffic between backbone *** are seriously puzzled by the explosive growth of traffic between backbone ***,the research and analysis of traffic characteristics between backbone networks becomes *** this paper,based on the Hadoop platform,we analyze the monthly traffic features of two provinces by using the real data collected by our self-developed traffic monitoring ***,we use SARIMA model to select a daily trace that can represent the monthly trace ***,through analyzing the distribution of packet counts,flow duration,and user online time and so on,we examine the basic traffic characteristics and user behavior characteristics from the perspective of flows.

关键词： Characteristic analysis,Traffic between backbone networks,SARIMA model,User behavior,Hadoop

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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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Energy-efficient power allocation with QoS guarantee in OFDMA wireless networks

Energy-efficient power allocation with QoS guarantee in OFDM...

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International Symposium on Wireless Personal Multimedia Communications (WPMC)

作者： Shenghua He Zhaoming Lu Xiangming Wen Zhicai Zhang Yong Sun Ling Zhang Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing

ISBN: (纸本)9781479964123

The explosive growth of high-data-rate multimedia services, with diverse quality-of-service (QoS) requirements, in wireless networks will lead to enormous energy consumption. Thus, the main challenge in designing recent wireless networks is to utilize network resources as efficiently as possible while ensuring the QoS for users. In this paper, we investigate the energy-efficient power allocation with QoS considered in the downlink of wireless multimedia networks with orthogonal frequency division multiple access (OFDMA). Firstly, energy-efficient power allocation problem is molded as the maximization of energy efficiency (EE) under different QoS requirements. Subsequently, an energy-efficient power allocation algorithm with chaotic particle swarm optimization (CPSO) is proposed. Finally, simulation results show that the proposed algorithm can converge much faster, compared with water-filling power allocation (WFPA), but both of them improve the EE greatly, compared with equal-power power allocation (EPPA).

关键词： Resource management Quality of service Multimedia communication Optimization Wireless networks Chaotic communication

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Performance analysis of envelope tracking power amplifier's envelope shaping methods for LTE mobile terminal application

Performance analysis of envelope tracking power amplifier's ...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Yongbin Wu Xinning Zhu Xinshulin Li Hailun Xia Zhimin Zeng Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing

ISBN: (纸本)9781479949113

Envelope tracking (ET) is a significant technique to improve the efficiency of power amplifier (PA) in the power back-off region, especially in modern mobile communication system with a high peak-to-average power ratio (PAPR). Different ET implementation solutions, especially the way of choosing shaping table, have a great impact on the performance of ET system. In this paper, a transistor-level PA and a behavior-level supply modulator are introduced to analyze the performance of ET PA system. The power-added efficiency (PAE), AM-to-AM distortion, AM-to-PM distortion and Adjacent Channel Leakage Ratio (ACLR) are investigated to explain the impacts of different commonly-used shaping methods. Simulation results indicate that adopting ET technology increases the efficiency of RF PA largely, and the shaping methods applied in supply modulation will affect a lot in efficiency and linearity. Consequently, a new dualmode ET shaping method is proposed in this paper to guarantee high efficiency as far as possible without introducing too much distortions. Besides, it also improves the linearity where the PAE is at a lower level.

关键词： Distortion Power generation Radio frequency Linearity Modulation Distortion measurement Mobile communication

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QoS-aware energy-efficient power control in two-tier femtocell networks based on Q-learning

QoS-aware energy-efficient power control in two-tier femtoce...

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International Conference on Telecommunications (ICT)

作者： Zhicai Zhang Xiangming Wen Zhengfu Li Shenghua He Wenpeng Jing Jun Zhao Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing

Due to the time-varying nature of wireless channels, deterministic quality of service (QoS) is hard to guarantee in wireless networks. In this paper, by integrating information theory with the principle of effective capacity, we formulate an energy efficiency optimization problem with statistical QoS guarantee in the uplink of two-tier femtocell networks. To solve the problem, we introduce a Q-learning mechanism based on Stackelberg game framework, in which macro-user acts as a leader, and knows all femto-users' transmit power strategy; while femto-users are followers, and only communicate with macrocell base station (MBS) not with other femtocell base stations (FBS). In Stackelberg game studying procedure, macro-user selects transmit power level firstly based on the best responses of femto-users, femto-users interact with environment directly, and find their best responses. At last, a distributed Q-learning algorithm is proposed. Simulation results show the proposed algorithm has a better performance in terms of convergence speed while providing delay QoS provisioning.

关键词： Quality of service Games Delays Femtocell networks Resource management convergence Wireless communication

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Common phase error cancellation scheme with DPOLSK in OFDM system

Common phase error cancellation scheme with DPOLSK in OFDM s...

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International Conference on Telecommunications (ICT)

作者： Yao Nie Chunyan Feng Caili Guo Fangfang Liu Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing

In order to cancel the common phase error (CPE) in OFDM system, a novel scheme employing differential polarization shift keying (DPOLSK) is proposed. In the proposed scheme, we use the phase difference between a couple of orthogonally polarized components to bear the data information at the transmitter. Moreover, at the receiver the constellation rotation caused by CPE could be effectively cancelled, by reversing the phase of one component which can make the direction of constellation rotation of two components opposite and equal, and then multiplying the two components. Numerical results and analysis show that the proposed scheme achieves the same spectral efficiency as the conventional scheme while outperforming in bit error rate (BER).

关键词： Telecommunications Three-dimensional displays Conferences

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Price-based power control with statistical delay QoS guarantee in two-tier femtocell networks

Price-based power control with statistical delay QoS guarant...

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International Conference on Telecommunications (ICT)

作者： Shenghua He Ling Zhang Xiangming Wen Zhicai Zhang Zhaoming Lu Yong Sun Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing

Macrocells may suffer serious interference induced by the deployment of co-channel femtocells. To mitigate the cross-interference, we design a novel price-based power control method, with each femtocell user's delay quality-of-service (QoS) provisioning, in uplink OFDMA two-tier femtocell networks. Assuming that the macrocell base station (MBS) protects itself by pricing the interference from femtocell users (FU), a Stackelberg game is formulated with a goal to reach the joint utility maximization of the macrocell and the femtocells subject to a maximum tolerable interference power at the MBS. The Nash Equilibrium (NE) of its non-cooperative subgame is found with optimization theory firstly, and then a particle swarm optimization (PSO) aided power allocation (PSO-PA) algorithm is proposed to achieve the final Stackelberg Equilibrium (SE). Simulation results show that our proposed power allocation algorithm can converge quite fast and bring much higher effective capacity (EC) at FU side.

关键词： Telecommunications Conferences

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A M-Continuous-Polarization Modulation scheme for improving the bandwidth efficiency

A M-Continuous-Polarization Modulation scheme for improving ...

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International Symposium on Wireless Personal Multimedia Communications (WPMC)

作者： Ruomeng Li Fangfang Liu Zhimin Zeng Chunyan Feng Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing

ISBN: (纸本)9781479964123

In Multilevel Polarization Modulation (MPM), the abrupt switching among the discrete Sates of Polarization (SOPs) brings discontinuity of signal waveforms, which will broaden bandwidth and decrease the bandwidth efficiency consequently. To alleviate the problem, in this paper a Multilevel Continuous Polarization Modulation (MCPM) scheme is proposed with continuous SOP to produce continuous signal waveforms. The signal is modulated at the transmitter with continuous SOPs by changing the amplitude ratio smoothly while keeping the phase difference constant, which are two basic elements of a SOP. At the receiver, the signal is demodulated based on the change of the amplitude ratio between the current and the former received SOP, which is extracted by the Stokes receiver. Furthermore, we evaluate the scheme with bandwidth efficiency and Symbol Error Rate (SER) of the received signal in an AWGN channel. The theoretical analysis and simulation results show that when the fraction of the received signal power is 99%, the bandwidth efficiency of the MCPM is 21.87% better than the MPM. The MCPM, meanwhile, has about a 0.6dB lower requirement in per bit energy-to-noise ratio than the MPM at the same modulation order.

关键词： Bandwidth Modulation Vectors Wireless communication Receivers Multimedia communication Error analysis

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