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2007 2nd International Symposium on Wireless Pervasive Computing最新文献

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Middleware for multi-client and multi-server mobile applications 用于多客户机和多服务器移动应用程序的中间件
2007 2nd International Symposium on Wireless Pervasive Computing Pub Date : 2007-04-16 DOI: 10.1109/ISWPC.2007.342643
Bruno P. S. Rocha, C. Rezende, A. Loureiro
{"title":"Middleware for multi-client and multi-server mobile applications","authors":"Bruno P. S. Rocha, C. Rezende, A. Loureiro","doi":"10.1109/ISWPC.2007.342643","DOIUrl":"https://doi.org/10.1109/ISWPC.2007.342643","url":null,"abstract":"With popularization of mobile computing, many developers have faced problems due to great heterogeneity of devices. To address this issue, we present in this work a middleware for multi-client and multi-server mobile applications. We assume that the middleware at the server side has no resource restrictions, whereas at the client side it is light and does not incur much overhead to the applications, since the mobile device has several limitations. Offering a transparent communication API and allowing applications to divide their work amongst server and client sides, the proposed middleware becomes a viable alternative for development of distributed and mobile applications. We present as a case study an event notification service and show how it benefits from the proposed middleware","PeriodicalId":403213,"journal":{"name":"2007 2nd International Symposium on Wireless Pervasive Computing","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121570760","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: 6
An investigative study of cyclic prefix-free MC-CDMA arrayed-MIMO communication systems 循环无前缀MC-CDMA阵列mimo通信系统的研究
2007 2nd International Symposium on Wireless Pervasive Computing Pub Date : 2007-04-16 DOI: 10.1109/ISWPC.2007.342563
Ho Huat Peh, A. Manikas, T. Tjhung, W. Wong
{"title":"An investigative study of cyclic prefix-free MC-CDMA arrayed-MIMO communication systems","authors":"Ho Huat Peh, A. Manikas, T. Tjhung, W. Wong","doi":"10.1109/ISWPC.2007.342563","DOIUrl":"https://doi.org/10.1109/ISWPC.2007.342563","url":null,"abstract":"An arrayed-MIMO communication system, which employs antenna arrays at both ends of the wireless link, is proposed to leverage upon spatial information such as directions-of-arrival for achieving an improvement in performance. This is in contrast with conventional MIMO systems, which typically assume multiple independent antenna elements at the transmitters and receivers. This paper focuses on an arrayed-MIMO communication system operating over a frequency-selective fading channel and employs MC-CDMA as the modulation scheme. However, in a departure from conventional MC-CDMA systems, cyclic prefixes or guard intervals are not used for the MC-CDMA system employed here so that valuable bandwidth is not wasted on cyclic prefixes or guard intervals. The feasibility of the proposed system is supported by simulation results.","PeriodicalId":403213,"journal":{"name":"2007 2nd International Symposium on Wireless Pervasive Computing","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124973167","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: 2
Key Factor and Interaction for Network Performance in Mobile Ad Hoc Networks 移动Ad Hoc网络中影响网络性能的关键因素及其交互作用
2007 2nd International Symposium on Wireless Pervasive Computing Pub Date : 2007-04-16 DOI: 10.1109/ISWPC.2007.342619
Yiming Wang, D. Kaleshi, M. Barton, Jianhua He, Li Li, A. Munro, Z. Fan
{"title":"Key Factor and Interaction for Network Performance in Mobile Ad Hoc Networks","authors":"Yiming Wang, D. Kaleshi, M. Barton, Jianhua He, Li Li, A. Munro, Z. Fan","doi":"10.1109/ISWPC.2007.342619","DOIUrl":"https://doi.org/10.1109/ISWPC.2007.342619","url":null,"abstract":"In this paper, we present a comprehensive statistical experiment and identify the key factors and interactions that impact network performance over mobile ad hoc networks. We use the design of experiments software named Design-Ease to establish the mathematical model for analyzing the set of simulation results from ns2. A variety of important parameters for network performance including routing protocol, node density, node speed, traffic load and pause time are considered to capture the vital factors and interactions for network performance by measuring the packet delivery ratio, average delay, discovery time and recovery time in which latter two are the crucial metrics for ad hoc self-organising performance measurement. With the simulation and analysis results, we conclude the key factors and interactions which influence the specific network performance and suggest which aspects the designers should focus on for improving the given network performance","PeriodicalId":403213,"journal":{"name":"2007 2nd International Symposium on Wireless Pervasive Computing","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122041003","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: 2
Transmit Diversity Method with User's Power Constraint for Distributed Antenna System 分布式天线系统中具有用户功率约束的发射分集方法
2007 2nd International Symposium on Wireless Pervasive Computing Pub Date : 2007-04-16 DOI: 10.1109/ISWPC.2007.342609
Shenfa Liu, Zhiqiang He, Weilin Wu
{"title":"Transmit Diversity Method with User's Power Constraint for Distributed Antenna System","authors":"Shenfa Liu, Zhiqiang He, Weilin Wu","doi":"10.1109/ISWPC.2007.342609","DOIUrl":"https://doi.org/10.1109/ISWPC.2007.342609","url":null,"abstract":"In this paper, we consider single user transmit diversity problem in distributed antenna system. As known, maximum ratio transmission can maximize the received SNR under sum power constraint (SPC) (T. Lo, 1999). Multi user downlink beamforming problem with per-antenna power constraint (PAPC) is considered in papers ((F. Boccardi and H. Huang, 2006), (Wei Yu and Tian Lan, 2006)). In this paper, a general power constraint named user's power constraint (UPC) is placed on each antenna in distributed antenna system, which limits antenna practical power for desired user not higher than the constraint. The optimum transmit weight designing problem is investigated under both sum power constraint (SPC) and user's power constraint (UPC) in DAS. The weight designing problem under SPC and UPC is formulated as a nonlinear optimization problem, and we find the optimum weight vector have the same phase as MRT. After that, we transform the primal problem to a convex optimisation problem, and numerical method can be used to get the optimal solution. Furthermore, an algorithm named gradient-MRT is proposed to find the optimal solution","PeriodicalId":403213,"journal":{"name":"2007 2nd International Symposium on Wireless Pervasive Computing","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116553370","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: 10
VLSI Architectures for Turbo Decoding Message Passing Using Min-Sum for Rate-Compatible Array LDPC Codes 速率兼容阵列LDPC码的最小和Turbo解码报文传递VLSI架构
2007 2nd International Symposium on Wireless Pervasive Computing Pub Date : 2007-04-16 DOI: 10.1109/ISWPC.2007.342667
K. Gunnam, Weihuang Wang, G. Choi, M. Yeary
{"title":"VLSI Architectures for Turbo Decoding Message Passing Using Min-Sum for Rate-Compatible Array LDPC Codes","authors":"K. Gunnam, Weihuang Wang, G. Choi, M. Yeary","doi":"10.1109/ISWPC.2007.342667","DOIUrl":"https://doi.org/10.1109/ISWPC.2007.342667","url":null,"abstract":"In the recent literature, turbo decoding message passing (TDMP) or layered decoding has been proposed for the decoding of low-density parity-check (LDPC) codes using a trellis-based BCJR algorithm in check node units (CNU). We present a new architecture for supporting rate compatible array LDPC codes that uses an offset-based min-sum decoding algorithm instead of the BCJR. The proposed architecture utilizes the value-reuse properties of min-sum and block-serial scheduling of computations, along with TDMP. This novel architecture has the following features: removal of memory needed to store the sum of the variable node messages and the channel values, removal of memory needed to store the variable node messages, 40%-72% savings in storage of extrinsic messages depending on rate of the codes, reduction of routers by 50%, and increase of throughput up to 2times. Implementations on our test-bed FPGA achieve decoded throughputs up to 1.36 Gbps and 2.27 Gbps for each iteration for (5,k) and (3,k) array LDPC codes, respectively. ASIC implementation achieve decoded throughputs up to 5.9 Gbps for each iteration for (5,k) array LDPC codes.","PeriodicalId":403213,"journal":{"name":"2007 2nd International Symposium on Wireless Pervasive Computing","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134299812","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: 2
Hierarchical and fault-tolerant data aggregation in wireless sensor networks 无线传感器网络中的分层和容错数据聚合
2007 2nd International Symposium on Wireless Pervasive Computing Pub Date : 2007-04-16 DOI: 10.1109/ISWPC.2007.342661
M. Larrea, C. Martín, J. J. Astrain
{"title":"Hierarchical and fault-tolerant data aggregation in wireless sensor networks","authors":"M. Larrea, C. Martín, J. J. Astrain","doi":"10.1109/ISWPC.2007.342661","DOIUrl":"https://doi.org/10.1109/ISWPC.2007.342661","url":null,"abstract":"This paper presents three hierarchical algorithms for data aggregation in wireless sensor networks where sensors can crash and recover. The network is divided in several regions. The algorithms ensure (i) the selection of a common data aggregator sensor within each region, in charge of the collection of local data, and (ii) the selection of a unique super-aggregator sensor, in charge of the collection of global data, among all the aggregators. Both selections are achieved by implementing the Omega failure detector, which provides a self-organizing and fault-tolerant leader election service. We also introduce a battery depletion threshold to provide wireless sensor network QoS.","PeriodicalId":403213,"journal":{"name":"2007 2nd International Symposium on Wireless Pervasive Computing","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130272765","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: 17
Wireless System for Patient Home Monitoring 病人家庭监护无线系统
2007 2nd International Symposium on Wireless Pervasive Computing Pub Date : 2007-04-16 DOI: 10.1109/ISWPC.2007.342644
H. Marko, M. Maija
{"title":"Wireless System for Patient Home Monitoring","authors":"H. Marko, M. Maija","doi":"10.1109/ISWPC.2007.342644","DOIUrl":"https://doi.org/10.1109/ISWPC.2007.342644","url":null,"abstract":"Cost effectiveness is becoming the cornerstone in providing quality health care in aging populations. Information technology, when applied with care, can improve the productivity of health care facilities. One area where savings can be made is patient monitoring in situations where hospitalization is not otherwise needed. This paper describes a secure wireless home monitoring system that can be applied to various kinds of health care monitoring tasks","PeriodicalId":403213,"journal":{"name":"2007 2nd International Symposium on Wireless Pervasive Computing","volume":"152 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114638953","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: 14
An ICI-free synchronization algorithm in MIMOOFDM system MIMOOFDM系统中的一种无ici同步算法
2007 2nd International Symposium on Wireless Pervasive Computing Pub Date : 2007-04-16 DOI: 10.1109/ISWPC.2007.342608
Zhangyong Ma, Xiaoyun Wu, Wenwu Zhu
{"title":"An ICI-free synchronization algorithm in MIMOOFDM system","authors":"Zhangyong Ma, Xiaoyun Wu, Wenwu Zhu","doi":"10.1109/ISWPC.2007.342608","DOIUrl":"https://doi.org/10.1109/ISWPC.2007.342608","url":null,"abstract":"This paper presents a time-frequency synchronization algorithm in MIMO-OFDM system based on the special known preamble symbol. Due to the high date rate in next generation system, the synchronization performance is affected by multipath channel. In the paper, the IFFT characteristic of some special code is applied in order to remove the affection partially or completely. The detail synchronization procedure is presented in detail. Theoretical analysis and simulation results show that the estimator is robust in the wireless channel and can estimate the timing error and frequency offset of the system accurately. Moreover, the algorithm can be implemented in the real system simply","PeriodicalId":403213,"journal":{"name":"2007 2nd International Symposium on Wireless Pervasive Computing","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134387438","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: 5
Distributed Tuplespace and Location Management - an Integrated Perspective using Bluetooth 分布式元空间和位置管理——使用蓝牙的集成视角
2007 2nd International Symposium on Wireless Pervasive Computing Pub Date : 2007-04-16 DOI: 10.1109/ISWPC.2007.342637
A. Fongen, C. Larsen, G. Ghinea, S.J.R. Taylor
{"title":"Distributed Tuplespace and Location Management - an Integrated Perspective using Bluetooth","authors":"A. Fongen, C. Larsen, G. Ghinea, S.J.R. Taylor","doi":"10.1109/ISWPC.2007.342637","DOIUrl":"https://doi.org/10.1109/ISWPC.2007.342637","url":null,"abstract":"Location based or \"context aware\" computing is becoming increasingly recognized as a vital part of a mobile computing environment. As a consequence, the need for location-management middleware is widely recognized and actively researched. Location management is frequently offered to the application through an API where the location is given in the form of coordinates. It is the opinion of the authors that a localization API should offer localized data (e.g. direction to the nearest pharmacy) directly through a transparent and integrated API. Our proposed middleware for location and context management is built on top of Mobispace. Mobispace is a distributed tuplespace made for J2me units where replication between local replicas takes place with a central server (over GPRS) or with other mobile units (using Bluetooth). Since a Bluetooth connection indicates physical proximity to another node, a set of stationary nodes may distribute locality information over Bluetooth connections, and this information may be retrieved through the ordinary tuplespace API","PeriodicalId":403213,"journal":{"name":"2007 2nd International Symposium on Wireless Pervasive Computing","volume":"136 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133751330","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: 2
Analysis of tracking methods for wireless indoor localization 室内无线定位跟踪方法分析
2007 2nd International Symposium on Wireless Pervasive Computing Pub Date : 2007-04-16 DOI: 10.1109/ISWPC.2007.342653
J. Besada, A. Bernardos, P. Tarrío, J. Casar
{"title":"Analysis of tracking methods for wireless indoor localization","authors":"J. Besada, A. Bernardos, P. Tarrío, J. Casar","doi":"10.1109/ISWPC.2007.342653","DOIUrl":"https://doi.org/10.1109/ISWPC.2007.342653","url":null,"abstract":"In this paper we perform a comparative analysis of several localization and tracking methods based on WIFI networks. We describe the signal environment basis of the position observations, and we discuss on training needs, localization computational needs, accuracy, stability, etc. The study is based on simulations of the signal fading effects, and on measurements taken in an experimental deployment","PeriodicalId":403213,"journal":{"name":"2007 2nd International Symposium on Wireless Pervasive Computing","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133871335","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: 26
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