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2010 5th International Symposium on Telecommunications最新文献

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A compact MIM zeroth order resonator antenna 一种紧凑型MIM零阶谐振器天线
2010 5th International Symposium on Telecommunications Pub Date : 2010-12-04 DOI: 10.1109/ISTEL.2010.5734006
S. Majedi, A. Attari
{"title":"A compact MIM zeroth order resonator antenna","authors":"S. Majedi, A. Attari","doi":"10.1109/ISTEL.2010.5734006","DOIUrl":"https://doi.org/10.1109/ISTEL.2010.5734006","url":null,"abstract":"In this paper a compact μ negative zeroth order resonator (ZOR) antenna using metal-insulator-metal (MIM) structure is presented. The μ negative (MNG) and ε negative (ENG) transmission lines (TLs) are artificial TLs which have been introduced recently. These transmission lines are simpler than the composite right/left handed (CRLH) TL while, similar to CRLH TL, they can be used as zeroth order resonators. MNG ZOR antenna has been previously introduced based on an interdigital structure which is fed by a microstrip line in parallel with the antenna. The MNG ZOR antenna presented in this paper is based on the MIM structure which has some advantages over the interdigital structure. In addition, we use a coaxial feed and a specific matching mechanism which, in comparison with the previous work, leads to the more compact antenna and also lowers the cross-polarization level.","PeriodicalId":306663,"journal":{"name":"2010 5th International Symposium on Telecommunications","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126010052","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
Publishing Persian linked data; challenges and lessons learned 发布波斯语关联数据;挑战和经验教训
2010 5th International Symposium on Telecommunications Pub Date : 2010-12-04 DOI: 10.1109/ISTEL.2010.5734119
Behshid Behkamal, M. Kahani, S. Paydar, Mahboobeh Dadkhah, Elaheh Sekhavaty
{"title":"Publishing Persian linked data; challenges and lessons learned","authors":"Behshid Behkamal, M. Kahani, S. Paydar, Mahboobeh Dadkhah, Elaheh Sekhavaty","doi":"10.1109/ISTEL.2010.5734119","DOIUrl":"https://doi.org/10.1109/ISTEL.2010.5734119","url":null,"abstract":"This paper discusses the challenges of publishing Persian linked data based on an experience of publishing some academic data from Ferdowsi University of Mashhad dataset. By analyzing the experimental results of the project and classifying the problems, some publisher-oriented solutions are proposed to improve the quality of datasets on the web.","PeriodicalId":306663,"journal":{"name":"2010 5th International Symposium on Telecommunications","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132863221","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: 12
DS-CDMA blind detection for frequency-selective multipath channels by neural networks 基于神经网络的DS-CDMA选频多径信道盲检测
2010 5th International Symposium on Telecommunications Pub Date : 2010-12-04 DOI: 10.1109/ISTEL.2010.5733998
Majid Shakhsi Dastgahian, H. Khoshbin, S. Shaerbaf, A. Seyedin
{"title":"DS-CDMA blind detection for frequency-selective multipath channels by neural networks","authors":"Majid Shakhsi Dastgahian, H. Khoshbin, S. Shaerbaf, A. Seyedin","doi":"10.1109/ISTEL.2010.5733998","DOIUrl":"https://doi.org/10.1109/ISTEL.2010.5733998","url":null,"abstract":"Up to now, various detection algorithms have been offered and investigated for DS-CDMA systems in multipath conditions. Here, We intend to implement sub-optimum receivers based on Maximum-Ratio-Combining (MRC) via neural network structures in Downlink systems. We will demonstrate that our design based on Radial Base function (RBF) and Multi Layer Perceptron (MLP) outperform in comparison of conventional detectors such as Match-Filter, Decorrelator Detector (DD) and MMSE manner. We also propose a new method when receiver doesn't know sequence code in CDMA receiver system and illustrate that RBF is proper when number of users are low and MLP is prefer where the number of users increased.","PeriodicalId":306663,"journal":{"name":"2010 5th International Symposium on Telecommunications","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123588568","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
Using pattern detection techniques and refactoring to improve the performance of ASMOV 使用模式检测技术和重构来提高ASMOV的性能
2010 5th International Symposium on Telecommunications Pub Date : 2010-12-04 DOI: 10.1109/ISTEL.2010.5734164
Bahareh Behkamal, Mahmoud Naghibzadeh, R. Askari Moghadam
{"title":"Using pattern detection techniques and refactoring to improve the performance of ASMOV","authors":"Bahareh Behkamal, Mahmoud Naghibzadeh, R. Askari Moghadam","doi":"10.1109/ISTEL.2010.5734164","DOIUrl":"https://doi.org/10.1109/ISTEL.2010.5734164","url":null,"abstract":"One of the most important challenges in semantic Web is ontology matching. Ontology matching is a technology that enables semantic interoperability between structurally and semantically heterogeneous resources on the Web. Despite serious research efforts on ontology matching, matchers still suffers from severe problems with respect to the quality of matching results. Furthermore, Most of them take a lot of time for finding the correspondences. The aim of this paper is improving ontology matching results by adding the preprocessing phase for analyzing the input ontologies. This phase is added in order to solve problems caused by ontology diversity. We select one of the best matchers of Ontology Alignment Evaluation Initiative (OAEI) which is Automated Semantic Matching of Ontologies with Verification, called ASMOV. In preprocessing phase, some new patterns of ontologies are detected and then refactoring operations are used for reaching assimilated ontologies. Afterward, we applied ASMOV for testing our approach on both the original ontologies and their refactored counterparts. Experimental results show that these refactored ontologies are more efficient than the original unrepaired ones with respect to the standard evaluation measures i.e. Precision, Recall, and F-Measure.","PeriodicalId":306663,"journal":{"name":"2010 5th International Symposium on Telecommunications","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127676118","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
Experimental investigation of a dual band-reject filter using C-shaped DGS with improved Q-factor 改进q因子的c形DGS双带阻滤波器的实验研究
2010 5th International Symposium on Telecommunications Pub Date : 2010-12-04 DOI: 10.1109/ISTEL.2010.5734047
Mostafa Attaran Kakhki, M. H. Neshati
{"title":"Experimental investigation of a dual band-reject filter using C-shaped DGS with improved Q-factor","authors":"Mostafa Attaran Kakhki, M. H. Neshati","doi":"10.1109/ISTEL.2010.5734047","DOIUrl":"https://doi.org/10.1109/ISTEL.2010.5734047","url":null,"abstract":"A compact, small size dual band-stop C-shaped defected ground structure (DGS) is proposed in this paper. Two similar C-shaped patterned ground structures are designed and their dimensions are adjusted to obtain band rejection frequency response at 2.4 GHz and 6.7 GHz. Then, two DGSs structure are cascaded in series to obtain a high Q-factor dual-band rejection property. The distance between two DGSs is adjusted for an acceptable response. All structures are numerically investigated using HFSS and the dual band filter is designed and implemented. Results show that there are two parallel resonance frequencies at 2.468 GHz and 6.629 GHz with a very high Q-factor, while signal attenuation at the resonant frequencies is at least 20 dB. Also, the equivalent circuit of the proposed filter including two parallel resonance RLC circuit based on measured S-parameters is presented. The new introduced DGS filter is successfully designed and fabricated and the measured results are in a good agreement with those obtained by numerical investigation.","PeriodicalId":306663,"journal":{"name":"2010 5th International Symposium on Telecommunications","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116339931","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
Beamforming in multiuser MIMO downlink systems: Non-cooperative and cooperative approaches 多用户MIMO下行系统中的波束形成:非合作和合作方法
2010 5th International Symposium on Telecommunications Pub Date : 2010-12-04 DOI: 10.1109/ISTEL.2010.5734038
H. Zamiri-Jafarian, S.M.J. Asgari Tabatabaee
{"title":"Beamforming in multiuser MIMO downlink systems: Non-cooperative and cooperative approaches","authors":"H. Zamiri-Jafarian, S.M.J. Asgari Tabatabaee","doi":"10.1109/ISTEL.2010.5734038","DOIUrl":"https://doi.org/10.1109/ISTEL.2010.5734038","url":null,"abstract":"In this paper, joint transmitter and receiver beamforming algorithms are proposed for downlink in multiuser multi-input multi-output (MIMO) communication systems. The proposed beamforming algorithms are developed based on non-cooperative and cooperative utility functions. In non-cooperative approach, utility function of each user is defined based on the performance of the user without considering the impact of the user's action on the others. However in cooperative approach, in addition to the performance of the user, the impact of user's action on the other users is considered in the user's utility function. Two iterative algorithms are derived by maximizing the utility function of the user in order to estimate transmitter and receiver beamforming vectors. The performances of the proposed algorithms are evaluated by computer simulations and compared with that of the duality method-based minimum mean square error (DM-MMSE) beamforming algorithm. Simulation results show the superiority of our proposed cooperative beamforming algorithm regarding the bit error rate (BER) performance and convergence rate.","PeriodicalId":306663,"journal":{"name":"2010 5th International Symposium on Telecommunications","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127537912","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
Cooperative beamforming in MIMO-OFDMA cognitive radio systems MIMO-OFDMA认知无线电系统中的协同波束形成
2010 5th International Symposium on Telecommunications Pub Date : 2010-12-04 DOI: 10.1109/ISTEL.2010.5733995
M. Abbasi Jannat-Abad, H. Zamiri-Jafarian
{"title":"Cooperative beamforming in MIMO-OFDMA cognitive radio systems","authors":"M. Abbasi Jannat-Abad, H. Zamiri-Jafarian","doi":"10.1109/ISTEL.2010.5733995","DOIUrl":"https://doi.org/10.1109/ISTEL.2010.5733995","url":null,"abstract":"In this paper, a new algorithm is proposed for cooperative beamforming in the multiple input multiple output (MIMO) orthogonal frequency division multiple access (OFDMA) cognitive radio (CR) systems. The objective is to maximize the signal to interference plus noise ratio (SINR) of the selected secondary users subject to guarantee the primary user's quality of service over all subchannels. In each subchannel, in addition to the primary user (PU), one secondary user (SU), whose quality of service is the best, is selected to be serviced. The transmitter and receiver beamforming vectors are estimated by a two-step iterative algorithm. The performance of the algorithm is evaluated by computer simulations under different scenarios.","PeriodicalId":306663,"journal":{"name":"2010 5th International Symposium on Telecommunications","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129516992","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
A fair active queue management approach based on supply and demand model 一种基于供需模型的公平主动队列管理方法
2010 5th International Symposium on Telecommunications Pub Date : 2010-12-04 DOI: 10.1109/ISTEL.2010.5734034
Hamid Saadatfar, M. Yaghmaee, H. Rajabi Mashhadi
{"title":"A fair active queue management approach based on supply and demand model","authors":"Hamid Saadatfar, M. Yaghmaee, H. Rajabi Mashhadi","doi":"10.1109/ISTEL.2010.5734034","DOIUrl":"https://doi.org/10.1109/ISTEL.2010.5734034","url":null,"abstract":"In the case of congestion the competition of flows for obtaining network resources increases and since the network resources are shared between different flows, the fair allocation of them becomes a crucial issue. In this work, we propose a fair active queue management (AQM) mechanism based on a well-known economic model called supply and demand. AQM is an effective router-based approach for avoiding congestion. The proposed framework not only provides properly a fair resource allocation for different flows but also overcomes several shortcomings of previous AQM mechanisms. The advantages of proposed method were also confirmed by the experimental results.","PeriodicalId":306663,"journal":{"name":"2010 5th International Symposium on Telecommunications","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126611767","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 and simulation of OSPF routing protocol fuzzy model by two costraint: Bandwidth and queue size of router 基于路由器带宽和队列大小两个约束的OSPF路由协议模糊模型的设计与仿真
2010 5th International Symposium on Telecommunications Pub Date : 2010-12-04 DOI: 10.1109/ISTEL.2010.5734032
Hossein Kari, Hossein Yaghmaee Moghadam, R. Monsefi
{"title":"Design and simulation of OSPF routing protocol fuzzy model by two costraint: Bandwidth and queue size of router","authors":"Hossein Kari, Hossein Yaghmaee Moghadam, R. Monsefi","doi":"10.1109/ISTEL.2010.5734032","DOIUrl":"https://doi.org/10.1109/ISTEL.2010.5734032","url":null,"abstract":"Expanded use of the computer, their connectivity, network complexity of computers and the users needs of services quality has varied. Routing in throughways has a significant role in optimal transmission of informational packet transportation. OSPF is one of the optimal routing protocols in compare with its counterpars, RIP. It seems that routing is not enough to express the real state of the link just by a criterion. There is usually a concern about informational packages accuracy of the state advertisement. Exactness of the foregoing information is predetermined to update the network state by the time interval. So it is probable some inaccurate information enter routing process due to the absence of mentioned parameter frequency registration. [1]. So it is more practical to let another parameter other than that mono-criterion cooperates in expressing the link state not to emerge a problem of demonstrative/expressive information exactness of the network state in this research we analyze the combination of two parameter bandwidth link and router queue length related to the same link to establish a fuzzy metric with the help of a simple fuzzy algorithm. Committed simulation simulator environment NS-2 shows better results in Linux system after trying various scenarios in comparison to the OSPF mono-criterion method.","PeriodicalId":306663,"journal":{"name":"2010 5th International Symposium on Telecommunications","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123392650","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
An efficient and class based active Queue Management for next generation networks 面向下一代网络的高效、基于分类的主动队列管理
2010 5th International Symposium on Telecommunications Pub Date : 2010-12-04 DOI: 10.1109/ISTEL.2010.5734033
A. Mohajerzadeh, R. Monsefi, Mohammad Hossein Yaghmaee, N. Farzaneh
{"title":"An efficient and class based active Queue Management for next generation networks","authors":"A. Mohajerzadeh, R. Monsefi, Mohammad Hossein Yaghmaee, N. Farzaneh","doi":"10.1109/ISTEL.2010.5734033","DOIUrl":"https://doi.org/10.1109/ISTEL.2010.5734033","url":null,"abstract":"Delivering desired QoS to the applications is one of the most important challenges in next generation networks. Designing efficient queue management in midway nodes leads to improvement in NGN efficiency. This paper presents fair Efficient active Queue Management (EQM) mechanism for congestion avoidance and control in next generation networks. Proposed AQM mechanism uses instantaneous queue length to detect incipient congestion. Different traffics with various QoS requirements are routed in NGN. EQM uses linear optimization problem to control congestion in network nodes. Switching equipments drop arrival packets based on optimization problem outcomes. Proposed AQM mechanism is designed to accompany a transport-layer congestion control protocol such as TCP. We have simulated EQM using Opnet. Results show that proposed mechanism achieves its goals1.","PeriodicalId":306663,"journal":{"name":"2010 5th International Symposium on Telecommunications","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132115949","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
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