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2012 15th International Symposium on Wireless Personal Multimedia Communications, WPMC 2012

作者： Wei, Dong Feng, Chunyan Guo, Caili Beijing Key Laboratory of Network System Architecture and Convergence School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9789860334074

To improve the Power Amplifier (PA) energy efficiency, a Polarization-Amplitude-Phase Modulation (PAPM) scheme in wireless communication, which introduces the signal's Polarization State (PS), amplitude and phase as the information-bearing parameter, is proposed. Since that the transmitted signal's PS can be completely determined by a pair of orthogonal dual-polarized antennas and is unaffected by the PA, using the PS as the information-carrying parameter can further increase the data rate and allow PA to work in its non-linear region. Thus, the PA energy efficiency can be enhanced. On the basis of the above, to optimize the PA energy efficiency, an optimization problem regarding the output back off value and the ratio between the data carried by the PS and the amplitude-phase has been formulated, and the distribution of the optimum solutions is presented. The simulation results show that, with the same symbol error rate and channel state, PAPM can reduce the energy consumption per bit by 50% compared with QAM on average. © 2012 NiCT.

关键词： Energy efficiency

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An energy efficient Polarization Modulation scheme for nonlinear Power Amplifier

An energy efficient Polarization Modulation scheme for nonli...

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2012 IEEE Globecom Workshops, GC Wkshps 2012

作者： Wei, Dong Feng, Chunyan Guo, Caili Fangfang, Liu Beijing Key Laboratory of Network System Architecture and Convergence School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781467349413

To improve the Power Amplifier (PA) energy efficiency, a Polarization Modulation (PM) scheme that uses the Polarization State (PS) as the information bearing parameter is proposed. Since the PS determined by orthogonally dual-polarized antennas is unaffected by PA, PM can let PA operate in nonlinear region without suffering the distortion. Furthermore, to mitigate the wireless channel depolarization impairment to PM from the polarization dependent loss and the polarization mode dispersion, an Optimal Constellation Pre-compensation (OCP) algorithm is also presented. The simulation results show, with same symbol error rate, PM can reduce the energy consumption per bit by 25% at most compared with the traditional multi-phase shift keying. © 2012 IEEE.

关键词： Power amplifiers

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A power-saving scheduling algorithm for mixed multicast and unicast traffic in MBSFN

A power-saving scheduling algorithm for mixed multicast and ...

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2012 Computing, Communications and Applications Conference, ComComAp 2012

作者： Wu, Chaoan Sun, Xuekang Zhang, Tiankui School of Network Education Beijing University of Posts and Telecommunications Beijing China Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781457717178

In this paper, A power-saving scheduling algorithm (PSA) for mixed multicast and unicast traffic is proposed in multicast and broadcast single frequency network (MBSFN). This algorithm is designed on the purpose of reducing the terminal's energy consumption and improving system capacity. By MBSFN area scheduling scheme the throughput of multicast users is increased. And the users' energy consumption is reduced by decreasing the transition times between sleeping and active status in the use of discontinuous reception (DRX) mechanism which is applied for terminal's battery power saving in LTE. The simulation results show that the proposed strategy gains an improvement both in system throughput and the terminal's energy efficiency. © 2012 IEEE.

关键词： Scheduling algorithms

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The evaluation measure study in network traffic multi-class classification based on AUC 2012

The evaluation measure study in network traffic multi-class ...

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2012 International Conference on ICT convergence: "Global Open Innovation Summit for Smart ICT convergence", ICTC 2012

作者： Yang, Jie Wang, Yixuan Dong, Chao Cheng, Gang Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China Microsoft Corporation Redmond United States

ISBN: (纸本)9781467348287

Internet traffic monitoring and traffic characterization are essential for managing and optimizing network infrastructures. In general, the traffic classifier based on Machine Learning (ML) might not perform well for some cases such as imbalanced data sets. To address this issue, we propose an evaluation measure aiming for the case of imbalance multi-class network traffic classification based on the multi-objective metric, the area under the ROC (Receiver Operating Characteristic) curve, or simply AUC. The experiments show that our method is more sensitive in the case that the Minority classes being misclassified into the Majority classes than the otherwise. Hence, we could use this measure to evaluate the classifier performance in the distinguishing of misclassifying the Minority applications into the Majority applications. © 2012 IEEE.

关键词： Learning systems

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An empirical investigation into CDMA network traffic classification based on feature selection

An empirical investigation into CDMA network traffic classif...

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2012 15th International Symposium on Wireless Personal Multimedia Communications, WPMC 2012

作者： Yang, Jie Ma, Zheng Dong, Chao Cheng, Gang Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China Microsoft Corporation Redmond United States

ISBN: (纸本)9789860334074

With the rapid development of CDMA systems, mobile network based applications have been undergone a tremendous growth in the past several years. The ability to accurately classify network traffic is of critical importance to the network design, troubleshooting, performance evaluation, and optimization. In this paper, we explore the design of an accurate and scalable machine learning (ML) based traffic classification system upon correlation-based feature selection (CFS) methods. With extensive data collected from a Tier 1 production cellular network, we experimentally show that our proposal achieves a high classification accuracy and low computational complexity. © 2012 NiCT.

关键词： Wireless networks

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Membrane-inspired quantum shuffled frog leaping algorithm for spectrum allocation

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Journal of systems Engineering and Electronics 2012年第5期23卷 679-688页

作者： Hongyuan Gao Jinlong Cao College of Information and Communication Engineering Harbin Engineering University Harbin 150001 E R. China Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing 100876 P. R. China

To solve discrete optimization difficulty of the spectrum allocation problem,a membrane-inspired quantum shuffled frog leaping（MQSFL） algorithm is *** proposed MQSFL algorithm applies the theory of membrane computing and quantum computing to the shuffled frog leaping algorithm,which is an effective discrete optimization *** the proposed MQSFL algorithm is used to solve the spectrum allocation problem of cognitive radio *** hybridizing the quantum frog colony optimization and membrane computing,the quantum state and observation state of the quantum frogs can be well evolved within the membrane *** novel spectrum allocation algorithm can search the global optimal solution within a reasonable computation *** results for three utility functions of a cognitive radio system are provided to show that the MQSFL spectrum allocation method is superior to some previous spectrum allocation algorithms based on intelligence computing.

关键词： quantum shuffled frog leaping algorithm membrane computing spectrum allocation cognitive radio

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An opportunistic feedback scheme for downlink coordinated scheduling/beamforming

An opportunistic feedback scheme for downlink coordinated sc...

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2012 Computing, Communications and Applications Conference, ComComAp 2012

作者： Ning, Weidong Zhang, Tiankui Feng, Chunyan Zhao, Wenxiu Li, Yu-Ngok-Ruyue Beijing University of Posts and Telecommunications Beijing China Beijing Key Laboratory of Network System Architecture and Convergence Beijing China Advanced Wireless Research ZTE Corporation Shenzhen China

ISBN: (纸本)9781457717178

An opportunistic feedback scheme is proposed for reducing the uplink control information feedback for the coordinated scheduling/beamforming (CS/CB) mode in the coordinated multiple point (CoMP) systems. CoMP is a promising technology for LTE-Advanced to improve the coverage and the spectral efficiency. However, the total feedback load is substantially heavy and becomes a serious problem for the practical systems. The proposed opportunistic feedback scheme can reduce the feedback load with little user throughput deterioration. In the proposed feedback scheme, in each cooperating cells set, the cells are divided into one primary cell and several assistant cells. Users in the primary cell are fairly determined to feed back according to the normalized signal to interference plus noise ratio (SINR) threshold. In the assistant cells, users who cause less interference to the primary cell are supposed to feed back. The simulation results show that the proposed scheme reduces the feedback load magnificently, while keeping the performance loss minimal. © 2012 IEEE.

关键词： Cells

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Reducing feedback load for proportional fair scheduling in MIMO OFDM systems

Reducing feedback load for proportional fair scheduling in M...

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2012 Computing, Communications and Applications Conference, ComComAp 2012

作者： Zhao, Wenxiu Zhang, Tiankui Zeng, Zhimin Ning, Weidong Li, Yu-Ngok-Ruyue Beijing University of Posts and Telecommunications Beijing China Beijing Key Laboratory of Network System Architecture and Convergence Beijing China Advanced Wireless Research ZTE Corporation Shenzhen China

ISBN: (纸本)9781457717178

A feedback reduction scheme is proposed in multi-input multi-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. The proposed scheme can reduce the feedback load of channel quality indicator (CQI) required for proportional fair scheduling at base station (BS). The probability distributions of instantaneous rate and average rate are studied. Then the distribution of proportional fair (PF) priority is obtained. Each user predicts the probability of being scheduled on the condition that its own PF priority is known. To reduce the amount of feedback load, a hard threshold of PF probability is designed for the CQI feedback reduction. This threshold is broadcast to all the users and only the users whose instantaneous PF priorities are higher than the threshold will feed back the CQI. The amount of feedback load saved by implementing the hard threshold is determined and the effect on the system throughput is analyzed. The simulation results show that the proposed scheme can reduce the feedback overhead while minimize the throughput loss. © 2012 IEEE.

关键词： Probability distributions

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Limited Feedback Bit Allocation for Cooperative Multi-cell systems with Multi- user MIMO

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China Communications 2012年第1期9卷 34-39页

作者： Shi Junfeng Zhang Tiankui Zeng Zhimin Laboratory of Network System Architecture and Convergence Key Laboratory of Beijing CityBeijing University of Posts and TelecommunicationsBeijing 100876P.R.China

For the cooperative multi-cell systems with muki-user MIMO, a new limited feedback bit allocation scheme is proposed to minimize the rate loss caused by quantization error. In the proposed scheme, the Channel State Information （CSI） feedback of cell-edge user for the local service cell and the adjacent interference cell are separately quantized. Based on the upper bound of the rate loss of cell-edge user due to the limited feedback, the number of feedback bits for quantized CSI of the local service cell and the adjacent cell are optimized with the fixed total bits of the limited feedback. The simulation shows that our proposed scheme of feedback bits allocation efficiently decreases the interference and increases the rate of systems compared with that of equal bits allocation and those of other allocations.

关键词： limited feedback Block Diagonalization（BD） precoding multi-cell multi-user MIMO

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The sub-channel allocation algorithm in femtocell networks based on Ant Colony Optimization

The sub-channel allocation algorithm in femtocell networks b...

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2012 IEEE Military Communications Conference, MILCOM 2012

作者： Liu, Deli Zhang, Haijun Zheng, Wei Wen, Xiangming Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China Centre for Telecommunications Research Kings College London London United Kingdom

ISBN: (纸本)9781467317290

Femtocell is an effective technology to improve the system performance. In this paper, we address the problem of sub-channels allocation in OFDMA two-tier femtocell networks. Our objective is to maximize the rate sum of multiple femtocells with consideration of cross-tier interference between macrocell and multiple femtocells. A resource optimization approach based on Ant Colony Optimization Algorithm is proposed to implement the solution process of system. Simulation results show that the proposed algorithms not only improve the capacity of the femtocell system but also provide good proportional fairness among the femtocell users, as compared with the traditional algorithm. © 2012 IEEE.

关键词： Femtocell

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