Journal of China Universities of Posts and Telecommunications最新文献_第9页

Vision-based positioning system 基于视觉的定位系统

Journal of China Universities of Posts and Telecommunications Pub Date : 2016-10-01 Epub Date: 2017-01-02 DOI: 10.1016/S1005-8885(16)60062-6

Song Meina, Ou Zhonghong, E Haihong, Song Junde, Zhao Xuejun

{"title":"Vision-based positioning system","authors":"Song Meina, Ou Zhonghong, E Haihong, Song Junde, Zhao Xuejun","doi":"10.1016/S1005-8885(16)60062-6","DOIUrl":"https://doi.org/10.1016/S1005-8885(16)60062-6","url":null,"abstract":"<div><p>Conventional outdoor navigation systems are usually based on orbital satellites, e.g., global positioning system (GPS) and global navigation satellite system (GLONASS). The latest advances from wearable, e.g., BaiduEye and Google Glass, have enabled new approaches to leverage information from the surrounding environment. For example, they enable the change from passively receiving information to actively requesting information. Thus, such changes might inspire brand new application scenarios that were not possible before. In this work, we propose a vision-based navigation system based on wearable like Baidu Eye. We discuss the associated challenges and propose potential solutions for each of them. The system utilizes crowd sensing to collect and build a traffic signpost database for positioning reference. Then it leverages context information, such as cell identification (Cell ID), signal strength, and altitude combined with traffic sign detection and recognition to enable real-time positioning. A hybrid cloud architecture is proposed to enhance the capability of sensing devices (SD) to realize the proposed vision.</p></div>","PeriodicalId":35359,"journal":{"name":"Journal of China Universities of Posts and Telecommunications","volume":"23 5","pages":"Pages 88-96"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1005-8885(16)60062-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72232292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Mining microblog user interests based on TextRank with TF-IDF factor 基于TF-IDF因子的TextRank的微博用户兴趣挖掘

Journal of China Universities of Posts and Telecommunications Pub Date : 2016-10-01 Epub Date: 2017-01-02 DOI: 10.1016/S1005-8885(16)60056-0

Tu Shouzhong, Huang Minlie

引用次数: 34

Improved Rao-Blackwellized H∞ filter based mobile robot SLAM 基于改进Rao-Blackellized H∞滤波器的移动机器人SLAM

Journal of China Universities of Posts and Telecommunications Pub Date : 2016-10-01 Epub Date: 2017-01-02 DOI: 10.1016/S1005-8885(16)60057-2

Luo Yuan, Su Qin, Zhang Yi, Zheng Xiaofeng

{"title":"Improved Rao-Blackwellized H∞ filter based mobile robot SLAM","authors":"Luo Yuan, Su Qin, Zhang Yi, Zheng Xiaofeng","doi":"10.1016/S1005-8885(16)60057-2","DOIUrl":"https://doi.org/10.1016/S1005-8885(16)60057-2","url":null,"abstract":"<div><p>For the problems of estimation accuracy, inconsistencies and robustness in mobile robot simultaneous localization and mapping (SLAM), a novel SLAM based on improved Rao-Blackwellized H<sub>∞</sub> particle filter (IRBHF-SLAM) algorithm is proposed. The iterated unscented H<sub>∞</sub> filter (IUHF) is utilized to accurately calculate the importance density function, repeatedly correcting the state mean and the covariance matrix by the iterative update method. The laser sensor's observation information is introduced into sequential importance sampling routine. It can avoid the calculation of Jacobian matrix and linearization error accumulation; meanwhile, the robustness of the algorithm is enhanced. IRBHF-SLAM is compared with FastSLAM2.0 and the unscented FastSLAM (UFastSLAM) under different noises in simulation experiments. Results show the algorithm can improve the estimation accuracy and stability. The improved approach, based on the robot operation system (ROS), runs on the Pioneer3-DX robot equipped with a HOKUYO URG-04LX (URG) laser range finder. Experimental results show the improved algorithm can reduce the required number of particles and the operating time; and create online 2 dimensional (2-D) grid-map with high precision in different environments.</p></div>","PeriodicalId":35359,"journal":{"name":"Journal of China Universities of Posts and Telecommunications","volume":"23 5","pages":"Pages 47-55"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1005-8885(16)60057-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72232724","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Dense small cell clustering based on undirected weighted graph for local mobility management 基于无向加权图的密集小区聚类在本地移动性管理中的应用

Journal of China Universities of Posts and Telecommunications Pub Date : 2016-10-01 Epub Date: 2017-01-02 DOI: 10.1016/S1005-8885(16)60055-9

Li Yingying, Ma Zhonggui, Liu Liyu, Yan Wenbo

{"title":"Dense small cell clustering based on undirected weighted graph for local mobility management","authors":"Li Yingying, Ma Zhonggui, Liu Liyu, Yan Wenbo","doi":"10.1016/S1005-8885(16)60055-9","DOIUrl":"https://doi.org/10.1016/S1005-8885(16)60055-9","url":null,"abstract":"<div><p>The concept of dense small cell has been recently emerged as a promising architecture that can significantly improve spectrum efficiency and system capacity. However, it brings frequent handover for user equipment (UE). Furthermore, this will bring a great deal of signaling overhead to the core network. Virtual technology has been received widespread attention for solving this problem. Its essence is to form virtual cells by clustering various terminals properly. The local mobility management proposed recently is based on the virtual technology. Therefore, the formation process of virtual cells is the basis for the research in local mobility management. So clustering scheme for dense small cell network has been studied in this paper, and a maximum benefit merging algorithm based on undirected weighted graph has been proposed. There are X2 interfaces between the cluster head and each of cluster members within the same cluster. The cluster heads manage the handover among cluster members acting as the local anchors. The proposed clustering scheme is useful for local mobility management. The simulation results show that the proposed clustering algorithm can decrease the signaling overhead more than 70% and 20% compared with the non-clustering algorithm and other clustering algorithms respectively.</p></div>","PeriodicalId":35359,"journal":{"name":"Journal of China Universities of Posts and Telecommunications","volume":"23 5","pages":"Pages 32-39"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1005-8885(16)60055-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72232725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Performance analyses of OFDM AF relaying system in the presence of phase noise with APS and IPS APS和IPS在存在相位噪声情况下OFDM AF中继系统的性能分析

Journal of China Universities of Posts and Telecommunications Pub Date : 2016-10-01 Epub Date: 2017-01-02 DOI: 10.1016/S1005-8885(16)60051-1

Huang Jing , Li Juhu , Zhang Haiyan

{"title":"Performance analyses of OFDM AF relaying system in the presence of phase noise with APS and IPS","authors":"Huang Jing , Li Juhu , Zhang Haiyan","doi":"10.1016/S1005-8885(16)60051-1","DOIUrl":"https://doi.org/10.1016/S1005-8885(16)60051-1","url":null,"abstract":"<div><p>This article investigates the significant performances of orthogonal frequency division multiplexing (OFDM)-based dual-hop system in the presence of phase noise (PN). A scenario with Rayleigh fading statistics on both hops is assumed. Amplification factor for this amplify-and-forward (AF) relay networks system is divided into two conditions, average power scaling (APS) and instantaneous power scaling (IPS). Before deriving signal-to-noise ratios (SNR) under APS and IPS, the Gaussianity of intercarrier interference (ICI) is proved firstly. The accurate closed-form expressions of end-to-end SNR cumulative distribution functions (CDF) and probability density functions (PDF) for both cases are obtained later. With the help of moment generating functions (MGF), we have closed-form asymptotic expressions of bit error rate (BER), which show that the BER of system in the presence of PN cannot exceed a fixed level even when SNR in high regime. Finally, simulations verify accuracy of the results. Conclusion analysis will provide a useful help in future application of the system.</p></div>","PeriodicalId":35359,"journal":{"name":"Journal of China Universities of Posts and Telecommunications","volume":"23 5","pages":"Pages 1-9"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1005-8885(16)60051-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72232727","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Performance analysis of complexity reduction BP decoding of rateless codes by deleting low reliable symbols 删除低可靠符号降低复杂度的无码率BP译码性能分析

Journal of China Universities of Posts and Telecommunications Pub Date : 2016-10-01 Epub Date: 2017-01-02 DOI: 10.1016/S1005-8885(16)60054-7

Lei Weijia, Chen Shengnan

{"title":"Performance analysis of complexity reduction BP decoding of rateless codes by deleting low reliable symbols","authors":"Lei Weijia, Chen Shengnan","doi":"10.1016/S1005-8885(16)60054-7","DOIUrl":"https://doi.org/10.1016/S1005-8885(16)60054-7","url":null,"abstract":"<div><p>This paper investigates the performance of the method used to reduce the decoding complexity of rateless codes through the deletion of the received symbols with low reliability. In the decoder, the received symbols whose absolute value of logarithm likelihood ratio (LLR) is lower than the threshold are removed, together with their corresponding edges, and thus not involved in the decoding process. The relationship between the deletion probability and the likelihood ratio deletion threshold is derived. The average mutual information per received symbol is analyzed in the case of deletion. The required number of symbols for the decoder to keep the same performance as regular decoding decreases since the average mutual information per symbol increases with the deletion, thus reducing the decoding complexity. This paper analyzes the reduction of decoding computations and the consequent transmission efficiency loss from the perspective of mutual information. The simulation results of decoding performance are consistent with those of the theoretical analysis, which show that the method can effectively reduce the decoding complexity at the cost of a slight loss of transmission efficiency.</p></div>","PeriodicalId":35359,"journal":{"name":"Journal of China Universities of Posts and Telecommunications","volume":"23 5","pages":"Pages 26-31"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1005-8885(16)60054-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72269211","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Lifetime prediction of electrical connectors under multiple environment stresses of temperature and particulate contamination 电连接器在温度和颗粒污染的多种环境应力下的寿命预测

Journal of China Universities of Posts and Telecommunications Pub Date : 2016-10-01 Epub Date: 2017-01-02 DOI: 10.1016/S1005-8885(16)60059-6

Li Qingya , Gao Jinchun , Xie Gang , Jin Qiuyan , Ji Rui

引用次数: 9

Small-signal switch model of GaN HEMTs for MMIC applications MMIC应用GaN HEMT的小信号开关模型

Journal of China Universities of Posts and Telecommunications Pub Date : 2016-10-01 Epub Date: 2017-01-02 DOI: 10.1016/S1005-8885(16)60058-4

Du Lin , Yang Xiaofeng , Li Yang , Zhang Jincheng , Hao Yue

引用次数: 2

Mobile node aware opportunistic routing in dynamic wireless sensor network 动态无线传感器网络中的移动节点感知机会路由

Journal of China Universities of Posts and Telecommunications Pub Date : 2016-10-01 Epub Date: 2017-01-02 DOI: 10.1016/S1005-8885(16)60053-5

Lü Xiaojun , Jia Xinchun , Han Zongyuan , Yang Bo , Hao Jun

{"title":"Mobile node aware opportunistic routing in dynamic wireless sensor network","authors":"Lü Xiaojun , Jia Xinchun , Han Zongyuan , Yang Bo , Hao Jun","doi":"10.1016/S1005-8885(16)60053-5","DOIUrl":"https://doi.org/10.1016/S1005-8885(16)60053-5","url":null,"abstract":"<div><p>Opportunistic routing (OR) could adapt to dynamic wireless sensor networks (WSNs) because of its inherent broadcast nature. Most of the existing OR protocols focus on the variations of propagation environment which are caused by channel fading. However, a few works deal with the dynamic scenario with mobile nodes. In this paper, a mobile node (MN) aware OR (MN-OR) is proposed and applied to a WSN in the high-speed railway scenario where the destination node is deployed inside a high speed moving train, and the MN-OR not only considers the mobility of node but also utilizes the candidate waiting time induced by the timer-based coordination scheme. Specifically, to reduce the number of duplicate transmissions and mitigate the delay of information transmission, a new selection strategy of the candidate forwarders is presented. In addition, two priority assignment methods of the candidate forwarders are proposed for the general relay nodes (GRNs) and the rail-side nodes (RSNs) according to their different routing requirements. Extensive simulation results demonstrate that the proposed MN-OR protocol can achieve better network performances compared with some existing routing schemes such as the well-known Ad-hoc on-demand distance vector routing (AODV) and the extremely opportunistic routing (ExOR) protocols.</p></div>","PeriodicalId":35359,"journal":{"name":"Journal of China Universities of Posts and Telecommunications","volume":"23 5","pages":"Pages 15-25"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1005-8885(16)60053-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72269210","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Energy-efficiency based downlink multi-user hybrid beamforming for millimeter wave massive MIMO system 基于能量效率的毫米波大规模MIMO系统下行链路多用户混合波束形成

Journal of China Universities of Posts and Telecommunications Pub Date : 2016-08-01 Epub Date: 2016-09-15 DOI: 10.1016/S1005-8885(16)60045-6

Jiang Jing, Cheng Xiaoxue, Xie Yongbin

{"title":"Energy-efficiency based downlink multi-user hybrid beamforming for millimeter wave massive MIMO system","authors":"Jiang Jing, Cheng Xiaoxue, Xie Yongbin","doi":"10.1016/S1005-8885(16)60045-6","DOIUrl":"https://doi.org/10.1016/S1005-8885(16)60045-6","url":null,"abstract":"<div><p>The fifth generation mobile communication (5G) systems can provide Gbit/s data rates from massive multiple-input multiple-output (MIMO) combined with the emerging use of millimeter wavelengths in small heterogeneous cells. This paper develops an energy-efficiency based multi-user hybrid beamforming for downlink millimeter wave (mmWave) massive MIMO systems. To make better use of directivity gains of the analog beamforming and flexible baseband processing of the digital beamforming, this paper proposes the analog beamforming to select the optimal beam which can maximize the power of the objective user and minimize the interference to all other users. In addition, the digital beamforming maximizes the energy efficiency of the objective user with zero-gradient-based approach. Simulation results show the proposed algorithm provide better bit error rate (BER) performance compared with the traditional hybrid beamforming and obviously improved the sum rate with the increase in the number of users. It is proved that multi-user MIMO (MU-MIMO) can be a perfect candidate for mmWave massive MIMO communication system. Furthermore, the analog beamforming can mitigate the inter-user interference more effectively with the selection of the optimal beam and the digital beamforming can greatly improve the system performance through flexible baseband processing.</p></div>","PeriodicalId":35359,"journal":{"name":"Journal of China Universities of Posts and Telecommunications","volume":"23 4","pages":"Pages 53-62"},"PeriodicalIF":0.0,"publicationDate":"2016-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1005-8885(16)60045-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72290127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 20