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检索条件"机构=Broadband Wireless Communication and Sensor Network Technology Key Lab"

共 798 条记录，以下是311-320 订阅

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Multichannel analysis for uplink heterogeneous cellular networks with flexible cell association 7

Multichannel analysis for uplink heterogeneous cellular netw...

引用

7th IET International Conference on wireless, Mobile and Multimedia networks, ICWMMN 2017

作者： Hu, Han Wang, Hong Yang, Jie Pan, Ziyu Jiangsu Key Lab of Wireless Communications Key Lab on Wideband Wireless Communications and Sensor Network Technology of Ministry of Education Nanjing University of Posts and Telecommunications Jiangsu Nanjing210003 China Communication Engineering Department Nanjing Institute of Technology Jiangsu Nanjing211167 China

ISBN: (纸本)9781785615153

In this paper, an analytical framework is developed to evaluate the uplink outage and spatial blocking performance in a multichannel heterogeneous cellular network. A weighted uplink cell association criterion and random channel reuse scheme are integrated in the considered model. The spatial locations of base stations (BSs) per tier as well as the users (UEs) are modelled as independent Poisson point processes. Because of the maximum transmit power constraint, a UE is allowed to communicate with its serving BS only when it has sufficient transmit power to support full channel inversion. With the aid of stochastic geometry, uplink spatial blocking and outage probability are respectively derived, which are validated to be quite close to the true distributions by extensive simulations. Thus, the theoretical analysis developed in this paper is valid. Then, the effect of network parameters, such as weighted factor, power cut-off threshold, and channel reuse factor, can be evaluated by quickly closed-form expressions rather than error-prone system-level simulations. © Institution of Engineering and technology. All rights reserved.

关键词： Outages

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Multiuser MIMO user selection schemes using block diagonalization

Multiuser MIMO user selection schemes using block diagonaliz...

引用

2011 International Conference on Computer, communication, Control and Automation, 3CA 2011

作者： Chunfang, Zhang Long-Xiang, Yang Meiling, Ding Zhihua, Wu Jiangsu Key Lab. of Wireless Communications Nanjing University of Posts and Telecommunications Nanjing 210003 China Key Lab. of Broadband Wireless Communications and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing 210003 China ZTE Corporation China

ISBN: (纸本)9783642255403

Block diagonalization (BD) is a classical and practical interference cancelation precoding algorithm in MU-MIMO system. But once BD is used, the user number can be supported simultaneously by the base station is limited by the ratio of the numbers of transmit and receive antennas. In this paper, some existed lower complexity user selected schemes are discussed. These schemes are all based on capacity as the performance measure. However, there is an inherent drawback in these algorithms. Since the BS always selected the same users based on capacity or the correlation of the users in each time slot, it may not guarantee the quality-of-service of a single user. In order to ensure fairness in some systems, we improve the existed algorithms and propose the round-robin user selection algorithms. © 2011 Springer-Verlag.

关键词： MIMO systems

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Effective Prediction Mode Decision Scheme Concerning Scene Switch

Effective Prediction Mode Decision Scheme Concerning Scene S...

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International Conference on wireless communications and Signal Processing

作者： Wei Pu Dong Hu Education Ministry's Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications

ISBN: (纸本)9781509028610

In HEVC, prediction mode decision is essential for efficient coding in applications. While many fast algorithms have been designed to reduce the candidate modes, the features of scene switch frames have seldom been considered. These frames usually have no relationship with the previous frames. Thus, intra modes should be used. In this paper, we propose a simple and efficient Hash-based algorithm. It evaluates the motion intensity of videos and can detect the occurrence of scene switch efficiently. Then chooses the best prediction modes among intra ones directly for CUs in these frames. Experimental results show that it achieves 42% to 53% time saving of the switch frame prediction. Meanwhile, as the prediction time of a switch frame is about 5 to 13 times over that of a normal continuous frame, the algorithm can achieve an outstanding improvement in the prediction of the whole video, especially when dealing with multi-scene videos.

关键词： Mode decision Intra mode Motion intensity Scene switch

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Optimal power allocation and relay selection for cognitive two-way AF relaying network

Optimal power allocation and relay selection for cognitive t...

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IET International Conference on Information Science and Control Engineering 2012 (ICISCE 2012)

作者： Ronghua Luo Zhen Yang Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications China

ISBN: (纸本)9781629939254

In an underlay cognitive two-way Amplify-and-Forward (AF) relaying network, secondary users (SUS) and primary user (PU) can share the licensed spectrum simultaneously under the interference threshold constraint. In this paper, the joint power allocation and optimal relay selection scheme is proposed for allocating radio resource on cognitive nodes effectively. For power allocation problem, the objective function is to maximize the achieved minimum Signal to Interference plus Noise Ratio (SINR) at SUS, and the constraints include the total transmit power of cognitive nodes and PU interference threshold, the optimal power allocation algorithm and a simple distributed power allocation algorithm are proposed. Furthermore, based on these results, an optimal two-way relay selection scheme is proposed. Simulation results show that the proposed joint power allocation algorithms and relay selection scheme can achieve excellent system performance.

关键词： Cognitive two-way AF relaying Interference threshold Power allocation Relay selection power splitting interference threshold Allocation Algorithm Transmitter power relay Bidirectional

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A dynamic web services selection algorithm based on trust model for grid environment

A dynamic web services selection algorithm based on trust mo...

引用

6th China Conference of wireless sensor networks, CWSN 2012

作者： Zhang, Lin Liu, Zhengbang Wang, Ruchuan Wang, Haiyan College of Computer Nanjing University of Posts and Telecommunications Jiangsu Province Nanjing 210003 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing University of Posts and Telecommunications Jiangsu Province Nanjing 210003 China Key Lab. of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Jiangsu Province Nanjing 210003 China

ISBN: (纸本)9783642362514

In order to find the service nodes, which the users are satisfied with, in a high speed and efficiency in open network environment, a new grid-oriented multi-level service selection model is proposed, which is based on the concept of user-similarity group. On this condition, direct trust calculation based on time decay is given and fine-grained recommendation trust calculation is studied, which can distinguish the ability of honesty. In addition, based on activity level of nodes, dynamic weight-allocation method is proposed, which can make the prediction results be closer to the fact. After job-interaction, the update algorithm about honesty ability of recommendation nodes is researched, which will provide more reasonable and reliable reference for the next prediction. Simulation results show that the service selection model and trust calculation methods are reasonable and accurate. © 2013 Springer-Verlag.

关键词： Grid computing

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R-AODV: A cognitive AODV routing algorithm in wireless network

R-AODV: A cognitive AODV routing algorithm in wireless netwo...

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6th China Conference of wireless sensor networks, CWSN 2012

作者： Ye, Xiaoguo Dong, Feifei Wang, Ruchuan College of Computer Nanjing University of Posts and Telecommunications Nanjing Jiangsu 210003 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing University of Posts and Telecommunications Nanjing Jiangsu 210003 China Key Lab. of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Jiangsu Province Nanjing Jiangsu 210003 China

ISBN: (纸本)9783642362514

wireless communication system plays a more and more important role in many fields. wireless network using traditional AODV algorithm only considers the minimal hop of all routes and can not meet specific QoS requirements. Some network resources will be wasted to some extend using traditional algorithm. A cognitive routing algorithm, R-AODV, which is based on the AODV algorithm, is proposed in this paper. The new proposed algorithm collects network status and chooses different routing strategy to make the best use of network resources. It may collect network status before having routing algorithm and according to different conditions of current network to choose different routing algorithm, which may make the best use of network resources. © 2013 Springer-Verlag.

关键词： Quality of service

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Compressed sensing data fusion of monitoring cyanobacteria bloom-forming

Compressed sensing data fusion of monitoring cyanobacteria b...

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6th China Conference of wireless sensor networks, CWSN 2012

作者： Zou, Zhiqiang Li, Zeting Zhao, Hao Hu, Cunchen Zhang, Fei College of Computer Nanjing University of Posts and Telecommunications Nanjing Jiangsu 210003 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing University of Posts and Telecommunications Nanjing Jiangsu 210003 China Key Lab. of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Jiangsu Province Nanjing Jiangsu 210003 China

ISBN: (纸本)9783642362514

wireless senor networks have more and more applications while fundamental constraint still exists, such as limited power supply and bandwidth. When the sensing signal exhibits spare, we can sampling only a part of signal corresponding to nonzero coefficients. Inspired by recent results in theory of compressive sensing (CS), we propose a data fusion method based on CS. First, we describe the distributed data fusion in UWSNs based on CS. Then, we present a monitoring model of the cyanobacteria bloom-forming (CBF). Finally, we demonstrate the performance analysis and provide concluding remarks. © 2013 Springer-Verlag.

关键词： Compressed sensing

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AR-HS: Ant routing optimized algorithm on HAPs-satellite integrated networks

AR-HS: Ant routing optimized algorithm on HAPs-satellite int...

引用

6th China Conference of wireless sensor networks, CWSN 2012

作者： Ye, Xiaoguo Cheng, Huimin Wang, Ruchuan College of Computer Nanjing University of Posts and Telecommunications Nanjing Jiangsu 210003 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing University of Posts and Telecommunications Nanjing Jiangsu 210003 China Key Lab. of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Jiangsu Province Nanjing Jiangsu 210003 China

ISBN: (纸本)9783642362514

The routing optimized problem in HAPs-Satellite integrated network is focused on this paper. A novel routing algorithm(AR-HS) based on the swarm intelligence by changing the pheromone updating strategy is proposed. In order to build an optimal solution, the proposed algorithm make use of ant agents that consist of probe packets sent on the HAPs-Satellite integrated network that allow to find the optimization problem solution. In this work we have performed a comparison of a classical shortest path algorithm with our the proposed algorithm ,and the simulation results show that our routing algorithm can reduce end to end delay and drop ratio, and improve performance of network. © 2013 Springer-Verlag.

关键词： Satellites

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Lorentzian hard thresholding pursuit for compressed sensing in the presence of impulsive noise 4

Lorentzian hard thresholding pursuit for compressed sensing ...

引用

2014 4th IEEE International Conference on Information Science and technology, ICIST 2014

作者： Yun-Yun, Ji Zhen, Yang College of Communications and Information Engineering Nanjing University of Posts and Telecommunications Nanjing Jiangsu Province210003 China Key Lab of 'Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing Jiangsu Province210003 China

ISBN: (纸本)9781479948086

The Lorentzian hard thresholding pursuit algorithm is proposed in this paper to achieve efficient reconstruction for compressed sensing in the presence of impulsive noise. In the Lorentzian hard thresholding pursuit algorithm, the minimum LL2 norm problem is solved with respect to a support which is obtained through the hard thresholding operator. The convergence and reconstruction performance of the Lorentzian hard thresholding pursuit algorithm is proved in theory in this paper. Experimental results show that the reconstruction performance of the Lorentizian hard thresholding pursuit algorithm is superior to the Lorentzian iterative hard thresholding algorithm which is also an effective algorithm for sparse reconstruction of compressed sensing in the impulsive noise environment. © 2014 IEEE.

关键词： Cost functions

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Low-cost VR system based on wireless accelerometer sensor

Low-cost VR system based on wireless accelerometer sensor

引用

6th China Conference of wireless sensor networks, CWSN 2012

作者： Jiang, Lingyun Wang, Ruchuan Qian, Wenxiang Lv, Yachao College of Computer Nanjing University of Posts and Telecommunications Jiangsu Province Nanjing 210003 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing University of Posts and Telecommunications Jiangsu Province Nanjing 210003 China Key Lab. of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Jiangsu Province Nanjing 210003 China

ISBN: (纸本)9783642362514

Virtual reality(VR) games have been popular in recent years, developed in the form of the games by capturing the body's various physiological activities, including the surrounding environmental factors to achieve a colorful variety of game features. This paper presents a system using acceleration sensor to capture the body movements to achieve gaming method. First the user's motion is captured by accelerometer sensor, then the signals collected by sensor can be processed and sent to computer. Finally the motion data of virtual character are synthesized to the VR game by the common interface processing these data. This motion-imitate system is diversity with combining various other appliances and the price and difficulty of development is reduced comparing with the recent mainstream VR games developing method. © 2013 Springer-Verlag.

关键词： Virtual reality

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