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An array antenna for MIMO systems with a decoupling network using bridge susceptances 一种基于电桥电纳解耦网络的MIMO系统阵列天线
无线互联科技 Pub Date : 2011-07-05 DOI: 10.1109/WIRELESSVITAE.2011.5940905
K. Kagoshima, S. Obote, A. Kagaya, K. Nishimura, N. Endo
{"title":"An array antenna for MIMO systems with a decoupling network using bridge susceptances","authors":"K. Kagoshima, S. Obote, A. Kagaya, K. Nishimura, N. Endo","doi":"10.1109/WIRELESSVITAE.2011.5940905","DOIUrl":"https://doi.org/10.1109/WIRELESSVITAE.2011.5940905","url":null,"abstract":"Decoupling and matching feeding networks are considerably interested in small wireless terminals to enhance their abilities for MIMO systems. In various proposals of DMFN's, the feeding networks composed of bridge susceptances and transmission lines are simple. However, this DMFN has only been applied to the limited array with special characteristics. This paper presents general design formulas of the DMFN for the two elements and three elements arrays and fundamental numerical data are presented to assure the validity of the design formulas.","PeriodicalId":68078,"journal":{"name":"无线互联科技","volume":"27 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2011-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90359979","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: 8
Considerations over implementing IEEE 802.21 on a device powered by a mobile operating system 在移动操作系统驱动的设备上实现IEEE 802.21的考虑
无线互联科技 Pub Date : 2011-07-05 DOI: 10.1109/WIRELESSVITAE.2011.5940880
Valentin Andrei, E. Popovici, O. Fratu, S. Halunga, Mihai Gavrilescu
{"title":"Considerations over implementing IEEE 802.21 on a device powered by a mobile operating system","authors":"Valentin Andrei, E. Popovici, O. Fratu, S. Halunga, Mihai Gavrilescu","doi":"10.1109/WIRELESSVITAE.2011.5940880","DOIUrl":"https://doi.org/10.1109/WIRELESSVITAE.2011.5940880","url":null,"abstract":"During the last years, software applications performing scenarios related to vertical handovers were revealed. However, the great majority of these demonstrators were designed and optimized for multimode notebooks, having a fair amount of processing power. This article aims to describe on how to implement and optimize the main components of the IEEE 802.21 standard on a device like a smartphone powered by a mobile operating system. Performance evaluations were made in this purpose showing reasonable delays, taking us one step closer to achieving a seamless vertical handover on a mobile terminal.","PeriodicalId":68078,"journal":{"name":"无线互联科技","volume":"18 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2011-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84424494","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
IEEE Dynamic Spectrum Access Networks (DYSPAN) standards committee IEEE动态频谱接入网络(DYSPAN)标准委员会
无线互联科技 Pub Date : 2011-07-05 DOI: 10.1109/WIRELESSVITAE.2011.5940881
H. Harada, Y. Alemseged, O. Holland
{"title":"IEEE Dynamic Spectrum Access Networks (DYSPAN) standards committee","authors":"H. Harada, Y. Alemseged, O. Holland","doi":"10.1109/WIRELESSVITAE.2011.5940881","DOIUrl":"https://doi.org/10.1109/WIRELESSVITAE.2011.5940881","url":null,"abstract":"This article presents the latest status and achievements of the IEEE Communication Society (ComSoc) Standards for Dynamic Spectrum Access Networks (DYSPAN), formerly IEEE Standards Coordinating Committee 41, that develops standards in the areas of dynamic spectrum access, cognitive radio, interference management, coordination of wireless systems, advanced spectrum management, and policy languages for next generation radio systems under the sponsorship of the IEEE communications society. The article also envisions future directions for the DYSPAN Committee. This paper represents the personal opinion of the authors, not the official opinion of the IEEE ComSoc DYSPAN standards committee.","PeriodicalId":68078,"journal":{"name":"无线互联科技","volume":"5 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2011-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91348674","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
Efficacy of multivariate cryptosystems for DWSN 多元密码系统在DWSN中的有效性
无线互联科技 Pub Date : 2011-07-05 DOI: 10.1109/WIRELESSVITAE.2011.5940862
Pradheepkumar Singaravelu, S. Verma
{"title":"Efficacy of multivariate cryptosystems for DWSN","authors":"Pradheepkumar Singaravelu, S. Verma","doi":"10.1109/WIRELESSVITAE.2011.5940862","DOIUrl":"https://doi.org/10.1109/WIRELESSVITAE.2011.5940862","url":null,"abstract":"Dynamic wireless sensor networks (DWSN) is a network of thousands tiny sensor devices deployed in a hostile environment. This network is mainly used for large scale environment monitoring. Security is vital for such networks. However, traditional cryptographic algorithms are resource intensive. They need large computation and require large memory and bandwidth. To address the problems of security in resource limited DWSN, different types of multivariate cryptosystems are proposed. The viability of multivariate cryptosystems for DWSN are examined. Results have indicated that the multivariate cryptosystems are attractive for DWSN. In this paper, efficacy of different multivariate cryptosystems for DWSN has been evaluated. In contrast to other multivariate cryptosystems schemes, rainbow multivariate scheme requires low computational power and reduced storage overheads. Simulation results also show that rainbow multivariate scheme can maximize throughput to achieve short latency for a particular interval of time.","PeriodicalId":68078,"journal":{"name":"无线互联科技","volume":"21 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2011-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78191459","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
A jamming defending data-forwarding scheme for delay sensitive applications in WSN 无线传感器网络中时延敏感应用的抗干扰数据转发方案
无线互联科技 Pub Date : 2011-07-05 DOI: 10.1109/WIRELESSVITAE.2011.5940919
Amrita Ghosal, Subir Halder, Md. Mobashir, Rajesh K. Saraogi, S. DasBit
{"title":"A jamming defending data-forwarding scheme for delay sensitive applications in WSN","authors":"Amrita Ghosal, Subir Halder, Md. Mobashir, Rajesh K. Saraogi, S. DasBit","doi":"10.1109/WIRELESSVITAE.2011.5940919","DOIUrl":"https://doi.org/10.1109/WIRELESSVITAE.2011.5940919","url":null,"abstract":"Wireless sensor network (WSN) has emerged as an important application area where nodes are generally placed in an unattended environment and therefore are vulnerable to attack by adversaries. Moreover in real time application domains delay even by fraction of a second may deceive the purpose of the application. Therefore, designing an attack-defending scheme for WSN without involving any additional delay in data-forwarding is an important challenge in this domain. The present work proposes a data-forwarding scheme having no additional delay to defend jamming attack in WSN. The scheme considers a multilayer architecture where the layers are made up of hexagonal cells each containing sensor nodes in the form of clusters. The nodes are randomly deployed throughout the network and clusters are formed so that every cell hosts two sets of clusters operating in two different predefined frequencies. We have provided design guideline to determine cell size in terms of network parameters. This guideline ensures that for a cluster head there is at least another cluster head at one-hop distance towards the sink and thereby ensures data-forwarding in shortest path. During data-forwarding, if a frequency is jammed, the cluster operating in that frequency becomes inoperative and the other cluster acts as back-up. We claim that the scheme defends jamming attack without incurring any additional delay and the claim is substantiated through simulation.","PeriodicalId":68078,"journal":{"name":"无线互联科技","volume":"52 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2011-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84672537","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: 11
Path selection in wireless Mobile Ad Hoc Network using fuzzy and rough set theory 基于模糊和粗糙集理论的无线移动自组网路径选择
无线互联科技 Pub Date : 2011-07-05 DOI: 10.1109/WIRELESSVITAE.2011.5940820
P. Seethalakshmi, M. Gomathi, G. Rajendran
{"title":"Path selection in wireless Mobile Ad Hoc Network using fuzzy and rough set theory","authors":"P. Seethalakshmi, M. Gomathi, G. Rajendran","doi":"10.1109/WIRELESSVITAE.2011.5940820","DOIUrl":"https://doi.org/10.1109/WIRELESSVITAE.2011.5940820","url":null,"abstract":"Mobile Ad Hoc Network (MANET) is a collection of wireless mobile nodes that dynamically forms a network. Many routing protocols exist to find the shortest path using various resources. A novel approach based on fuzzy and rough set theory is described in this work for the selection of effective routing paths using minimum number of resources. This paper shows the rough set technique that can be employed to generate simple rules and to remove irrelevant attributes (resources) for evaluating the best routing paths. An example is also given to illustrate the efficiency of the proposed method.","PeriodicalId":68078,"journal":{"name":"无线互联科技","volume":"4 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2011-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85574305","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
Foster creative engineers by PBL: A case study of student satellite project (AAUSAT3) at Aalborg University in Denmark PBL培养创新工程师:丹麦奥尔堡大学学生卫星项目(AAUSAT3)的案例研究
无线互联科技 Pub Date : 2011-07-05 DOI: 10.1109/WIRELESSVITAE.2011.5940808
C. Zhou, J. Nielsen, A. Kolmos
{"title":"Foster creative engineers by PBL: A case study of student satellite project (AAUSAT3) at Aalborg University in Denmark","authors":"C. Zhou, J. Nielsen, A. Kolmos","doi":"10.1109/WIRELESSVITAE.2011.5940808","DOIUrl":"https://doi.org/10.1109/WIRELESSVITAE.2011.5940808","url":null,"abstract":"In recent years, Problem and Project Based Learning (PBL) has been employed by a growing number of educational institutions to foster creative engineers. This paper aims to explore how PBL can develop creativity in engineering education. Accordingly, a qualitative case study was carried out with a student satellite project (AAUSAT3) in the department of electronic systems at Aalborg University in Denmark. Multiple methods including interviews and observation were employed. The analysis of the empirical data leads to the findings and discussions that PBL can foster creative engineers by providing conditions of problem analysis and solving, the shift from teaching to learning and team based projects. This research therefore contributes to both theory and practice in the PBL setting of engineering education.","PeriodicalId":68078,"journal":{"name":"无线互联科技","volume":"29 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2011-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90180814","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
How to find an optimal threshold for SSB algorithm 如何为SSB算法找到一个最优阈值
无线互联科技 Pub Date : 2011-07-05 DOI: 10.1109/WIRELESSVITAE.2011.5940888
Jian-Hong Wang, Yang-Sheng Chen, Yu-Shuang Wong, Hsing-Wen Wang, Der-Jiunn Deng
{"title":"How to find an optimal threshold for SSB algorithm","authors":"Jian-Hong Wang, Yang-Sheng Chen, Yu-Shuang Wong, Hsing-Wen Wang, Der-Jiunn Deng","doi":"10.1109/WIRELESSVITAE.2011.5940888","DOIUrl":"https://doi.org/10.1109/WIRELESSVITAE.2011.5940888","url":null,"abstract":"Slow Start Backoff (SSB) Algorithm is a simple, efficient, distributed, and well performing medium access control (MAC) layer protocol designed for ad-hoc wireless networks to share the medium. SSB is able to alleviate intensive collisions in high load environments, and SSB can also minimize the average channel access delay in light load environments. Compare with the traditional binary exponential backoff (BEB) algorithm, SSB provides better performance over a wider range of network condition. In this paper, we introduce an analytical model to analysis the saturation throughput of SSB algorithm, and then we use this analytical model to find out an optimal value of threshold for SSB algorithm that maximizes the network capacity based on the current channel status. Simulations are conducted to evaluate the performance of SSB protocol. The results confirm that the performance of SSB can be greatly improved by proper choice of the threshold according to the current channel status. Besides, the results also show the SSB algorithm outperforms the traditional BEB algorithm and its variants in both high load and light load environments when its threshold is optimal.","PeriodicalId":68078,"journal":{"name":"无线互联科技","volume":"27 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2011-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72895415","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
Peer evaluation and Peer review to support PBL teamwork 同行评估和同行评审以支持PBL团队合作
无线互联科技 Pub Date : 2011-07-05 DOI: 10.1109/WIRELESSVITAE.2011.5940815
E. de Graaff, G. Saunders-Smits
{"title":"Peer evaluation and Peer review to support PBL teamwork","authors":"E. de Graaff, G. Saunders-Smits","doi":"10.1109/WIRELESSVITAE.2011.5940815","DOIUrl":"https://doi.org/10.1109/WIRELESSVITAE.2011.5940815","url":null,"abstract":"In a Problem-Based Learning (PBL) curriculum in engineering, students work together as a project team. By doing that they have the opportunity to exercise teamwork competencies, like project management and communication skills while studying various engineering topics. In this process feedback is essential in order to stimulate the students. However, the lecturers do not witness all the interactions in the group and also it takes a lot of time to give extensive feedback. Peer review and Peer evaluation method enable teachers to assess teamwork competencies more completely and more time efficient. An extra benefit is that the students learn to take responsibility for assessing the value of contributions to the team efforts. Based on a research project at TU Delft in the Netherlands, this paper will present a variety of Peer evaluation and Peer review instruments and discuss their potential in supporting the PBL group process.","PeriodicalId":68078,"journal":{"name":"无线互联科技","volume":"112 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2011-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76738304","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
Design of LC-VCO for low power narrowband electronic applications 低功耗窄带电子应用的LC-VCO设计
无线互联科技 Pub Date : 2011-07-05 DOI: 10.1109/WIRELESSVITAE.2011.5940827
Dhrub Solanki, R. Chandel, T. Alam, A. Nishad
{"title":"Design of LC-VCO for low power narrowband electronic applications","authors":"Dhrub Solanki, R. Chandel, T. Alam, A. Nishad","doi":"10.1109/WIRELESSVITAE.2011.5940827","DOIUrl":"https://doi.org/10.1109/WIRELESSVITAE.2011.5940827","url":null,"abstract":"A low power, low phase-noise Inductance Capacitance voltage controlled oscillator (LC-VCO) is demonstrated on 180 nm CMOS Technology node. By using external current biasing it is not feasible to obtain low power and noise characteristic simultaneously. Therefore, low power and low phase noise characteristics are achieved by using the current mirror is being used. Also to reduce the power modifications is being done in the traditional LC-VCO structure. The VCO designed is operating at 12.5 GHz with tuning range of 7.75% which will useful for wireless narrowband applications. The phase noise attained is −117 dBc/Hz at 1 kHz offset from 12.5GHz oscillation frequency. The power dissipation is 0.1114mW for 1.8V supply voltage. The figure of merit for this LC-VCO is nearly 175. The present oscillator is the best amongst the various CMOS oscillators referred to from literature in terms of the power dissipation and frequency of oscillation.","PeriodicalId":68078,"journal":{"name":"无线互联科技","volume":"274 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2011-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77191281","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
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