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International Symposium on Wireless Personal Multimedia Communications (WPMC)

作者： Lu Yu Tiankui Zhang Chunyan Feng Qin Niu Gen Cao Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China Research Department China Information Technology Designing & Consulting Institute Co. Ltd Beijing China

ISBN: (纸本)9781479964123

In this paper, the optimal feedback bits allocation scheme between horizontal channel quantization and vertical channel quantization is proposed in three-dimensional (3D) multiple-input multiple-output (MIMO) systems with limited feedback. The proposed scheme aims to allocate more bits to quantize the channel dimension with stronger gains. The feedback bits allocation is studied by comparing the gains of horizontal channel and vertical channel. The optimization model is built in the form of minimizing the differences between limited feedback and ideal feedback under the condition of fixed bits. The optimum result of feedback bits allocation is obtained by strict derivations. The system level simulation results show that the 3D MIMO systems with optimal bit allocation can achieve higher spectral efficiency than equal bit allocation, the accuracy of which is then verified by the theoretical analysis.

关键词： Receiving antennas MIMO Interference Three-dimensional displays Signal to noise ratio Vectors Quantization (signal)

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No-reference video quality assessment via feature learning

No-reference video quality assessment via feature learning

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IEEE International Conference on Image Processing

作者： Jingtao Xu Peng Ye Yong Liu David Doermann Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications China Language and Media Processing Laboratory University of Maryland College Park USA SONY US Research Center USA

ISBN: (纸本)9781479957521

In this paper, we propose a novel “Opinion Free” (OF) No-Reference Video Quality Assessment (NR-VQA) algorithm based on frame-level unsupervised feature learning and hysteresis temporal pooling. The system consists of three components: feature extraction with max-min pooling, frame quality prediction and temporal pooling. Frame level features are first extracted by unsupervised feature learning and used to train a linear Support Vector Regressor (SVR) for predicting quality scores frame by frame. Frame-level quality scores are then combined by temporal pooling to obtain a single video quality score. We tested the proposed method on the LIVE video quality database and experimental results show that without training on human opinion scores the proposed method is comparable to state-of-the-art NR-VQA algorithms.

关键词： Quality assessment Video recording Training Nonlinear distortion Feature extraction Hysteresis

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Analysis of prediction performance in wavelet minimum complexity echo state network

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The Journal of China Universities of Posts and Telecommunications 2013年第4期20卷 59-66页

作者： CUI Hong-yan FENG Chen LIU Yun-jie Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications School of Information and Communication Engineering Beijing University of Posts and Telecommunications

Echo state network （ESN） has become one of the most popular recurrent neural networks （RNN） for its good prediction performance of non-linear time series and simple training process. But several problems still prevent ESN from becoming a widely used tool. The most prominent problem is its high complexity with lots of random parameters. Aiming at this problem, a minimum complexity ESN model （MCESN） was proposed. In this paper, we proposed a new wavelet minimum complexity ESN model （WMCESN） to improve the prediction accuracy and increase the practical applicability. Our new model inherits the characters of minimum complexity ESN model using the fixed parameters and simple circle topology. We injected wavelet neurons to replace the original neurons in internal reservoir and designed a wavelet parameter matrix to reduce the computing time. By using different datasets, our new model performed better than the minimum complexity ESN model with normal neurons, but only utilized tiny time cost. We also used our own packets of transmission control protocol （TCP） and user datagram protocol （UDP） dataset to prove that our model can deal with the data packet bit prediction problem well.

关键词： wavelet minimum complexity echo state network echo state network wavelet parameter matrix practical applicability

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Offline traffic analysis system based on Hadoop

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The Journal of China Universities of Posts and Telecommunications 2013年第5期20卷 97-103页

作者： QIAO Yuan-yuan LEI Zhen-ming YUAN Lun GUO Min-jie Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Produce Ads Amazon Joyo Co. Ltd

Offiine network traffic analysis is very important for an in-depth study upon the understanding of network conditions and characteristics, such as user behavior and abnormal traffic. With the rapid growth of the amount of information on the Intemet, the traditional stand-alone analysis tools face great challenges in storage capacity and computing efficiency, but which is the advantages for Hadoop cluster. In this paper, we designed an offiine traffic analysis system based on Hadoop （OTASH）, and proposed a MapReduce-based algorithm for TopN user statistics. In addition, we studied the computing performance and failure tolerance in OTASH. From the experiments we drew the conclusion that OTASH is suitable for handling large amounts of flow data, and are competent to calculate in the case of single node failure.

关键词： MapReduce Hadoop cloud computing traffic analysis

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Joint Relay Selection and Spectrum Allocation Scheme in Cooperative Relay networks

Joint Relay Selection and Spectrum Allocation Scheme in Coop...

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IEEE Conference on Vehicular Technology (VTC)

作者： Tiankui Zhang Jinlong Cao Zhimin Zeng Dantong Liu Beijing University of Posts and Telecommunications Beijing China Beijing Key Laboratory of Network System Architecture and Convergence Beijing China China Telecom Corporation Limited Beijing China Queen Mary University of London London United Kingdom

ISBN: (纸本)9781479944811

Joint relay selection and spectrum allocation scheme with multiple source-destination pairs and multiple potential relays in cooperative relay networks is proposed in this paper. In cooperative relay networks, the selected relay nodes and spectrum resource allocated to each source-destination pair have great impact on the system performance. It is an optimization problem for which relay nodes are selected and which spectrum resources are assigned. The exhaustive search can solve this problem but the complexity will increase factorially with the network size (i.e., the number of source-destination pairs and the number of relays in the network) and exponentially with the number of available spectrum resources. This paper proposes a novel quantum particle swarm optimization (QPSO) based relay selection and spectrum allocation scheme which can maximize three definitions of system throughput but has less computational complexity. Simulation results show that QPSO based scheme has the ability to find global optimal solution compared with other schemes in the literature.

关键词： Resource management Tin Optimization Interference Signal to noise ratio Relay networks (telecommunications)

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AUTOMATIC MULTI-LAYER PLANNING FOR PON DESIGN AND FAILURE SIMULATION

AUTOMATIC MULTI-LAYER PLANNING FOR PON DESIGN AND FAILURE SI...

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The 13th International Conference on Optical Communications and networks, ICOCN 2014(2014第13届光通信与网络国际会议)

作者： Yaocheng Yu Yuefeng Ji Hui Li Rentao Gu Yang Wang Guojun Liu Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts an China Electric Power Research Institute No.15Qing He Xiao Ying East RoadHaidian DistrictBeijing 1

We discuss the role of multi-layer plan in PON design and introduce a PON planning *** from the multi-layer mapping and routing mechanism,the automatic plan algorithm of multi-layers and related failure simulation are... 详细信息

关键词： multi-layer plan PON design

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Interference matrix based user association scheme in heterogeneous cellular networks

Interference matrix based user association scheme in heterog...

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International Conference on Communication systems

作者： Tiankui Zhang Zixiong Peng Yutao Zhu Yapeng Wang Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecoms China Syracuse University Syracuse USA MPI-QMUL Information Systems Research Centre Macao Polytechnic Institute Macau

ISBN: (纸本)9781479958337

User association is one of the key techniques of the resource management in the heterogeneous cellular networks (HetNets). Interference management plays an important role on the system performance improvement in interference limited cellular networks. In this paper, we address the user association problem from the view of interference management of HetNets. Especially, we consider the co-channel interference from both intra-tier and inter-tier, and propose an interference matrix based user association scheme. We use interference matrix to obtain the leakage plus noise ratio (SLNR) of each users in the HetNets. In the proposed scheme, the optimization problem of user association is modeled jointly taking the SLNR of users and traffic load of base stations into consideration, which gives a tradeoff between interference mitigation and load balancing. A simple but useful heuristic algorithm is given to obtain a suboptimal solution of the user association problem. We give the simulation results of the proposed scheme on the system throughput and user fairness, which can effectively achieve the tradeoff between interference mitigation and load balancing.

关键词： Interference Throughput Indexes Optimization Telecommunication traffic Load management Downlink

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Performance Analysis of Discontinuous Reception Mechanism with Web Traffic in LTE networks

Performance Analysis of Discontinuous Reception Mechanism wi...

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IEEE 24th International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Wu, Jiong Zhang, Tiankui Zeng, Zhimin Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781467362351

The long term evolution (LTE) networks provide high data rate access to support multi-media services at the expense of more power consumption in user equipment (UE). Discontinuous reception (DRX) mechanism is one of the promising technologies for energy saving in LTE networks, which extends UE battery lifetime effectively. The DRX parameters configuration should make a compromise between power saving and wake-up delay, which can be achieved by the DRX parameters configuration according to different traffic types with specific quality of service (QoS) requirement. In this paper, we model the DRX mechanism with web traffic using a semi-Markov process. Based on the proposed model, the performance of power saving and wake-up delay with various DRX parameters is analysed, which provides insight on effects of the DRX parameters on the power saving and wake-up delay performance. The analytical results are verified by the simulation, which shows that LTE DRX achieves much power saving gains at the cost of tolerable delay.

关键词： LTE power saving web traffic DRX mechanism

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A relay selection scheme based on geometric optimum in cooperative cognitive systems over mixed channels

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High Technology Letters 2013年第3期19卷 321-326页

作者：李静叶 Luo Tao Shao Yubin Yue Guangxin Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications School of Information Engineering and Automation Kunming University of Science and Technology

This paper proposes a relay selection scheme based on geometric optimum principle to maximize the cognitive link＇ s connectivity with limited interference to primary user in cooperative cognitive systems. A dual-hop cognitive relay system is considered, in which the channel impulse response follows independent non-identical distribution （i. n. d. ） each hop, such as Rician, Rayleigh and Nakagami-m distribution. Then, closed-form expressions in terms of outage probability and average bit error rate （ABER） are obtained using amplify-and-forward （AF） relaying protocol over such mixed fading channels. Furthermore, the best range of the relay is derived. Extensive simulation re- suits are conducted to verify the theoretical analysis, which is useful to the network optimal design.

关键词： cognitive radio （CR） relay outage probability average bit error rate （ABER） mixed channels

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Hybrid field physical layer network coding in multi-user relay network

Hybrid field physical layer network coding in multi-user rel...

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National Doctoral Academic Forum on Information and Communications Technology 2013

作者： Guo, Yijun Hao, Jianjun Yue, Guangxin Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications China

ISBN: (纸本)9781849198196

Physical layer network coding (PNC) exploits the broadcast nature of wireless channel to obtain transmission efficiency gains. This paper proposes a hybrid field physical layer network coding (HFNC) approach and applys HFNC to the multi-user relay networks. The proposed method enables a reliable transmission with variable throughput under different signal-to-noise ratios (SNR). With given constellation rotations at sources, the points of the equivalent superpositioned (ESP) constellation cluster. The HFNC-based decoding can be divided into two layers. Point-level (PL) decoding over the complex-field achieves a higher throughput as complex field network coding (CFNC), while cloud-level decoding defined in the finite-field is able to resist bad channel with a lower throughput. Excellent performances of symbol error probability (SEP) and transmission efficiency are proved by both theoretical analysis and simulation results.

关键词： Throughput

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