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

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Two-Staged Load Balancing Mechanism in LTE Self-Organization networks

Two-Staged Load Balancing Mechanism in LTE Self-Organization...

引用

2013 2nd International Conference on Mechanical Properties of Materials and Information Technology(ICMPMIT 2013)

作者： Li Li Zhang Jingjing Chen Jianya Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

In mobile communication system,the traffic is time-varying and unpredictable,so there will be some hot-spot *** means that,the number of service request is much higher than an acceptable level in some cells,which may result in call-blocking with a large *** in other cells of system there are still resources available to serve more *** to avoid the imbalance to effectively improve the system's resource utilization is what load balancing need to *** this paper,a new kind of event-trigger mechanism using cell load status information exchange between eNBs via X2 interface is ***,based on it,a novel load balancing algorithm,named TSLB(two-staged load balancing),for LTE systems is put *** this algorithm,eNBs can start corresponding load balancing procedure accurately according to the cell load status in real-time without any manual *** results show that the method is valid and it can increase the system throughput significantly as well as decrease the network delay.

关键词： LTE SON Load balancing Trigger mechanism Handover

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A cyclic time-delay-based distributed precoding relay system

A cyclic time-delay-based distributed precoding relay system

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2013 15th IEEE International Conference on Communication Technology

作者： Jiansong Miao Chaoyi Zhang Lin Ma Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

ISBN: (纸本)9781479900763

In order to alleviate the multipath interference of the MIMO multi-relay system and improve the system spectrum efficiency,this paper presents a cyclic delay distributed precoding relay *** channel state information(CSI) sent from the source node,according to its phase information and relay node's matrix match,sends the signals to destination node via specific relay node,rather than the tradition broadcasts to all *** at the relay node,we design a distributed precoding cyclic delay relay scheme to improve and balance the destination node's received signal *** last,the receiver achieves the signals coherent combination and completes the system *** results show the proposed distributed precoding scheme improves the system capacity,reduces the encoding complexity,and is well suited for multi-relay system.

关键词： Cooperative communication CSI Multi-realy system Distributed precoding

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A Fast Relay Selection Algorithm over 60GHz mm-Wave systems

A Fast Relay Selection Algorithm over 60GHz mm-Wave Systems

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2013 15th IEEE International Conference on Communication Technology

作者： Kan Song Ran Cai Danpu Liu Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

Due to the weak diffraction,millimeter-wave(mm-Wave) communication is vulnerable to human *** technology is an effective way to cope with LOS link ***,how to quickly find appropriate relay is critical to network performance due to the need of transmission *** paper proposes a fast relay selection(FRS) algorithm based on the geographical location *** narrowing the relay candidates in specific sectors,FRS greatly reduces the relay searching overhead time compared with traditional exhaustive relay selection(ERS).Simulation results show that FRS improves searching efficiency at the expense of the minimal loss of channel capacity.

关键词： IEEE 802.11ad Relay Human blockage Fast relay selection

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A High-Reliability Data Gathering Protocol Based on Mobile Sinks for Wireless Sensor networks

A High-Reliability Data Gathering Protocol Based on Mobile S...

引用

2013 22nd Wireless and Optical Communication Conference

作者： Ji Huang Danpu Liu Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

ISBN: (纸本)9781467356985

With the booming development of Wireless Sensor networks(WSNs),enormous surges of attentions have put to the research of mobile data gathering strategies for WSNs in recent *** this paper,a high-reliability data gathering protocol based on mobile sinks(HRDG-MS) for WSNs is *** the protocol,the mobile sinks move randomly and send BEACON packets ***,the sensor nodes that have route(s) to mobile sinks send DATA packets which include the state information of the nodes and their distance to mobile *** the aid of DATA packet and BEACON packet,the whole network can establish and maintain the routing information without any extra route packet and location *** achieve load-balance,three factors are taken into account when deciding the ***'s more,in order to reduce the packet loss ratio caused by the mobility of sinks,two novel approaches are adopted in the proposed protocol,***-RouteBuffer mechanism and adaptive BEACON interval strategy *** results demonstrate that the proposed algorithm outperforms the existing work in packet loss ratio.

关键词： Wireless Sensor networks High-reliability Mobile Sinks

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A Novel Octagon Pilot Pattern Design Method

A Novel Octagon Pilot Pattern Design Method

引用

2013 15th IEEE International Conference on Communication Technology

作者： Jiansong Miao Chaoyi Zhang Muqing Wu Lin Ma Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

ISBN: (纸本)9781479900763

In order to solve channel estimation's pilot interference problem,this paper researched OFDM system channel estimation model,analyzed the OFDM symbol's pilot pattern,proposed a new octagon guide frequency pattern design method,and combined with low signal to noise space of virtual pilot technology,used the interpolation method to eliminate interference,further improved the OFDM system channel estimation *** theory analysis carried out comparative experiments on different kinds of pilot pattern design methods,simulation results show that the octagon of pilot pattern was an optimal pilot pattern,this pilot shape reduced approximately 10% sample space better than similar methods,and provided better BER performance.

关键词： Pilot pattern pilot interference Channel estimation

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On the Optimal Pre-Coding Of Complex Field network Coding with Mpsk Modulation

On the Optimal Pre-Coding Of Complex Field Network Coding wi...

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2013 15th IEEE International Conference on Communication Technology

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

ISBN: (纸本)9781479900763

Complex field network coding(CFNC) enables a one-to-one mapping between the source signal vectors and the received *** outperforms other physical layer network coding methods which decode the received signal as a combination of source ***,the linear constellation pre-coding(LCP) scheme adopted by CFNC to compute complex coefficients is developed for MIMO system,which is not sufficient to achieve the optimal performance of *** paper considers the encoding process of CFNC as constellation rotations at sources and proposes an optimal rotation method to maximize the minimum Euclidean distance between equivalent constellation points at the *** performance gains are proved by both numerical evaluations and simulation results.

关键词： Complex field network coding,linear constellation pre-coding,constellation rotation,equivalent superpositioned constellation

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Mixed Analog/Digital Receiver Beamforming for 60GHz OFDM system with Co-channel Interference Mitigation

Mixed Analog/Digital Receiver Beamforming for 60GHz OFDM Sys...

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2013 22nd Wireless and Optical Communication Conference

作者： Jianxiong Zhao Dan Pu Liu Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

Large antenna arrays are usually used in 60GHz for beamforming to compensate the high path loss in this *** 802.15.3c adopted a beamforming codebook design to reduce the cost and power consumption of the large array,but which is not enough to deal with interference in a dense *** paper proposed a mixed analog and digital receiver beamforming structure with subarray partition,which keeps the simplicity of the IEEE 802.15.3c codebook antenna *** structure includes 2 stages:the Analog BeamForming(ABF) stage and the Digital BeamForming(DBF) *** the ABF stage,the codeword of each subarray is decided as described in IEEE 802.15.3c standard,and then the combined signal of each subarray is further optimized in the DBF stage based on Minimum Mean Square Error(MMSE) *** results have shown that the system performance against CCI could be significantly increased with only 1 additional AnalogFront-End(AFE) utilizing the proposed structure.

关键词： 60 GHz,beamforming,interference mitigation,subarray partition,codebook

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Toward Scalable and High Performance Data Processing for Cellular Data network

Toward Scalable and High Performance Data Processing for Cel...

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2013 15th IEEE International Conference on Communication Technology

作者： Zhengxiang Ke Jun Liu Dazhong He Qing Yan Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and elecommunications

ISBN: (纸本)9781479900763

Cellular Data network measurement and analysis has long been used to characterize Cellular Data network usage and user behaviors,but with the rapid growing of all kinds of smart terminals and the varied applications on them,the amount of Cellular Data network data has been growing *** respect to this challenge,a new management system for the data storage and query has been *** this paper,we present our applied Hadoop-based system with Cellular Data network flow upload and analyze *** combines data uploading and CDR(Calling Detail Records) query with Map/Reduce framework and *** uses Map/Reduce framework to process the users' request,HDFS to manage the data flow *** system has the ability to upload and for the network manager to query the CDR more conveniently and *** importantly,our system is applied to a real-world and has a good scalability,effectiveness and efficiency.

关键词： Cellular Data network,CDR,Map/Reduce,Hadoop,upload,query.

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A NO-REFERENCE PERCEPTUAL BLUR METRIC BASED ON THE BLUR RATIO OF DETECTED EDGES

A NO-REFERENCE PERCEPTUAL BLUR METRIC BASED ON THE BLUR RATI...

引用

2013 5th IEEE International Conference on Broadband network & Multimedia Technology

作者： Zhirong LI Yong LIU Jingtao XU Haiqing DU Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

ISBN: (纸本)9781479900961

In this paper, we present an efficient no-reference image blur metric which is based on the analysis of the spread of edge and the study of human blur perception for varying contrast values. Our method calculates blur ratio of significant edges and global vertical edges respectively, and final score is a weighted average of the two ratios because giving different edges different corresponding weights will improve prediction accuracy. Evaluation of the proposed metric shows its high prediction accuracy when it is applied to Gaussian blurred images. Experiments using the LIVE and TID Gaussian blur dataset demonstrate that the proposed algorithm correlates well with subjective quality evaluations.

关键词： Blur Image quality assessment No-reference Edge analysis

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Energy-efficient resource optimization in OFDMA-based dense femtocell networks

Energy-efficient resource optimization in OFDMA-based dense ...

引用

International Conference on Telecommunications (ICT)

作者： Zhicai Zhang Haijun Zhang Zhaoming Lu Zhenmin Zhao Xiangming Wen Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing

Femtocells have attracted growing attentions in academia, industry, and standardization forums in recent years. In this paper, we investigate a distributed radio resource allocation scheme to maximize the energy-efficiency in uplink OFDMA dense femtocell networks. We model the subchannel allocation and power control problem as a non-cooperation game. Due to the fact that joint subchannel allocation and power control problem is NP-hard, for decreasing the complexity, we decompose the resource allocation problem into two subproblems. A distributed subchannel allocation algorithm and an optimal power allocation algorithm are proposed to resolve the resource allocation problem. Simulation results show the proposed algorithm has better performance in terms of throughput and energy-efficiency.

关键词： Resource management Power control Games Interference Femtocell networks Throughput Wireless communication

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