2011 Fifth International Conference on Next Generation Mobile Applications, Services and Technologies最新文献_第2页

Fuzzy Logic Based Spectrum Sensing for Cognitive Radio Networks 基于模糊逻辑的认知无线电网络频谱感知

2011 Fifth International Conference on Next Generation Mobile Applications, Services and Technologies Pub Date : 2011-09-14 DOI: 10.1109/NGMAST.2011.41

W. Ejaz, N. Hasan, Saleem Aslam, H. Kim

{"title":"Fuzzy Logic Based Spectrum Sensing for Cognitive Radio Networks","authors":"W. Ejaz, N. Hasan, Saleem Aslam, H. Kim","doi":"10.1109/NGMAST.2011.41","DOIUrl":"https://doi.org/10.1109/NGMAST.2011.41","url":null,"abstract":"It is inevitable for cognitive radio to find unutilized portion of the spectrum more accurately for successful deployment of dynamic spectrum sensing. To achieve highly reliable spectrum sensing, usually cooperative spectrum sensing is employed but still there is a margin to improve local sensing decisions. Cooperative spectrum sensing improves reliability of sensing at the cost of cooperation overhead among cognitive radio users, which can be reduced by improving local spectrum sensing. Several signal processing techniques for primary user detection have been proposed in literature but still there is room for researchers in this field to explore more sophisticated approaches to enhance sensing efficiency. This paper proposes a two stage local spectrum sensing approach. In first step, each cognitive radio perform existing spectrum sensing techniques i.e. energy detection, matched filter detection and cyclostationary detection. While in second stage, the output from each technique employed in step 1 is combined using fuzzy logic to ultimately decide about the presence or absence of primary user. The proposed approach shows significant improvement in sensing accuracy by exhibiting higher probability of detection and low false alarms.","PeriodicalId":142071,"journal":{"name":"2011 Fifth International Conference on Next Generation Mobile Applications, Services and Technologies","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124231993","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: 40

Implementation of Spectrum Sensing Methods for UWB-Cognitive Radio System 超宽带认知无线电系统频谱感知方法的实现

2011 Fifth International Conference on Next Generation Mobile Applications, Services and Technologies Pub Date : 2011-09-14 DOI: 10.1109/NGMAST.2011.34

Nazar Radhi, Sofian Hamad, H. Al-Raweshidy

引用次数: 1

Primary Signal Transmitter Localization Using Cognitive Radio Networks 利用认知无线电网络定位主信号发射机

2011 Fifth International Conference on Next Generation Mobile Applications, Services and Technologies Pub Date : 2011-09-14 DOI: 10.1109/NGMAST.2011.33

Nazar Radhi, H. Al-Raweshidy

{"title":"Primary Signal Transmitter Localization Using Cognitive Radio Networks","authors":"Nazar Radhi, H. Al-Raweshidy","doi":"10.1109/NGMAST.2011.33","DOIUrl":"https://doi.org/10.1109/NGMAST.2011.33","url":null,"abstract":"In communication technology, cognitive radio networks can be effectively used to detect and track targets of interested (primary users). Primary transmitter location through the collaborative effort of multiple cognitive radio nodes is relevant in this investigate. A two stage source localization process is proposed in this work, the time difference of arrival values (TDOA) are first determined using the generalize cross correlation (GCC) method and then TDOA values are used by a least squares (LS) estimation scheme to determine the primary transmitter location. The effect number of CR nodes, spacing of inter node, topology, noise, distance of source to node, node failure, location perturbation on the location estimation performance have been studied through MATLAB simulation. Simulation result illustrate that the error difference can be reduced by increasing the number of CR nodes or the spacing inter nodes and improve the location estimation accuracy. The CR node topology should be well represented in all three dimensions to obtain required location estimation performance. In additional, result show that the primary transmitter location estimation accuracy is not harmfully affected by CR node failures or location perturbations.","PeriodicalId":142071,"journal":{"name":"2011 Fifth International Conference on Next Generation Mobile Applications, Services and Technologies","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126557054","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: 3

Semantic Handover for Seamless Service Continuity within User Ambient Context 在用户环境上下文中实现无缝服务连续性的语义切换

2011 Fifth International Conference on Next Generation Mobile Applications, Services and Technologies Pub Date : 2011-09-14 DOI: 10.1109/NGMAST.2011.17

R. Nassar, Soumia Kessal, N. Simoni

{"title":"Semantic Handover for Seamless Service Continuity within User Ambient Context","authors":"R. Nassar, Soumia Kessal, N. Simoni","doi":"10.1109/NGMAST.2011.17","DOIUrl":"https://doi.org/10.1109/NGMAST.2011.17","url":null,"abstract":"In a user-centric approach, the user wants to have a unique and continuous service session that best answers his ambient context. Spatial mobility is one of the factors that cause modifications in this ambient context and consequently influence the user's service session. On the network layers, many solutions have been conceived to overcome this challenge. However, this problem is not yet investigated on the service layer. For this purpose, we propose in this paper the concept of semantic handover. This concept acts on the service layer by analogy to the network's handover mechanisms. It is based on three complementary roles: the initiator, that detects a variation in user's ambient context caused by spatial mobility and that initiates the semantic handover, the decider, that decides which services should be replaced in user's service session and what are their ubiquitous counterparts, and the executor, that executes the decision and adapts user's service session to the new ambient context. By using this novel concept, we guarantee a seamless continuous service session for the end-user throughout his spatial mobility and ambient context. User's functional and non-functional (QoS criteria) preferences are also taken into account through the usage of the ubiquity approach in this service session adaptation.","PeriodicalId":142071,"journal":{"name":"2011 Fifth International Conference on Next Generation Mobile Applications, Services and Technologies","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117250521","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

Analysis of the Realistic Resolution with Angle of Arrival for Indoor Positioning 基于到达角的室内定位真实分辨率分析

2011 Fifth International Conference on Next Generation Mobile Applications, Services and Technologies Pub Date : 2011-09-14 DOI: 10.4018/jhcr.2013040101

A. V. Nieuwenhuyse, L. D. Strycker, N. Stevens, Jean-Pierre Goemaere, B. Nauwelaers

引用次数: 10

Experiences Building a Multi-Display Mobile Application for Exploring Mirror Worlds 构建用于探索镜像世界的多显示移动应用程序的经验

2011 Fifth International Conference on Next Generation Mobile Applications, Services and Technologies Pub Date : 2011-09-14 DOI: 10.1109/NGMAST.2011.11

Vlad Stirbu, P. Belimpasakis

引用次数: 3

A Rule-based Approach in Network Mobility IP Routing 一种基于规则的网络移动性IP路由方法

2011 Fifth International Conference on Next Generation Mobile Applications, Services and Technologies Pub Date : 2011-09-14 DOI: 10.1109/NGMAST.2011.35

J. Navarro, M. Cao, M. Álvarez-Campana, R. Romero

引用次数: 0

OLBS: Offline Location Based Services OLBS:离线位置服务

2011 Fifth International Conference on Next Generation Mobile Applications, Services and Technologies Pub Date : 2011-09-14 DOI: 10.1109/NGMAST.2011.22

Pedro Coelho, Ana Aguiar, J. C. Lopes

引用次数: 8

Expressive Audiovisual Message Presenter for Mobile Devices 富有表现力的视听信息演示器的移动设备

2011 Fifth International Conference on Next Generation Mobile Applications, Services and Technologies Pub Date : 2011-09-14 DOI: 10.4018/jhcr.2013010105

A. G. Goncalves, J. M. D. Martino

引用次数: 2

Diversity and End User Context in Smartphone Usage Sessions 智能手机使用会话中的多样性和终端用户语境

2011 Fifth International Conference on Next Generation Mobile Applications, Services and Technologies Pub Date : 2011-09-14 DOI: 10.1109/NGMAST.2011.12

Tapio Soikkeli, Juuso Karikoski, H. Hämmäinen

{"title":"Diversity and End User Context in Smartphone Usage Sessions","authors":"Tapio Soikkeli, Juuso Karikoski, H. Hämmäinen","doi":"10.1109/NGMAST.2011.12","DOIUrl":"https://doi.org/10.1109/NGMAST.2011.12","url":null,"abstract":"Mobile end user context has gained increasing attention in the mobile services industry. Context information is seen as an important component in developing new, more personalized, mobile services and applications. This paper studies the effect of end user context on smart phone usage sessions. Smart phone usage sessions are used to depict user behavior and usage habits of smart phone users on a high level. We have detected end user contexts, and extracted smart phone usage session information from handset-based data of 140 smart phone users. We first examine and describe usage sessions as such, and then in different end user contexts. According to our usage session analysis, smart phone usage is highly diversified across users. For example, the average number of sessions per day ranges from 3 to 46. Characteristics of smart phone usage sessions differ in different end user contexts. For example, an average session is 37 % longer in the Home-context than in the Office-context, but Office has 56 % more sessions per time unit than Home. The results imply that mobile services and applications need to adapt to user behavior in order to be personalized enough, and that context awareness is indeed a worthwhile step towards this.","PeriodicalId":142071,"journal":{"name":"2011 Fifth International Conference on Next Generation Mobile Applications, Services and Technologies","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121853098","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: 62