Pub Date : 2009-11-01DOI: 10.1109/MMS.2009.5409759
B. Nassereddine, A. Maach, S. Bennani
One of the attractive features of the wireless mesh network is its ability to scale to larger covered area by simply adding more wireless routers. This scalability increases the average number of hops from source to destination and hence it may affect the network performance in terms of delay and throughput. Many solutions have been proposed for wireless mesh networks. Among them the 802.11s proposes a Hybrid Wireless mesh Protocol HWMP. This protocol combines the functionalities of the Radio Metric Ad-hoc On demand Distance Vector protocol RM-AODV and the Tree Based Routing protocol TBR. In this work we propose to evaluate the scalability of the HWMP using network simulator NS2. For this purpose we used a grid wide network topologies with n*n static Mesh Point MP routers. The simulation results show a very interesting result related to the loss rate, path establishment delay, network throughput and signaling overhead.
无线网状网络的一个吸引人的特点是它能够通过简单地添加更多的无线路由器来扩展到更大的覆盖区域。这种可伸缩性增加了从源到目的地的平均跳数，因此可能会影响网络性能，包括延迟和吞吐量。针对无线网状网络，已经提出了许多解决方案。其中，802.11s提出了一种混合无线网格协议HWMP。该协议结合了无线电度量自组织随需应变距离矢量协议RM-AODV和基于树的路由协议TBR的功能。在这项工作中，我们建议使用网络模拟器NS2来评估HWMP的可扩展性。为此，我们使用了一个带有n*n个静态Mesh Point MP路由器的网格网络拓扑结构。仿真结果显示了丢包率、路径建立延迟、网络吞吐量和信令开销等方面的有趣结果。
{"title":"The scalability of the hybrid protocol in wireless mesh network 802.11s","authors":"B. Nassereddine, A. Maach, S. Bennani","doi":"10.1109/MMS.2009.5409759","DOIUrl":"https://doi.org/10.1109/MMS.2009.5409759","url":null,"abstract":"One of the attractive features of the wireless mesh network is its ability to scale to larger covered area by simply adding more wireless routers. This scalability increases the average number of hops from source to destination and hence it may affect the network performance in terms of delay and throughput. Many solutions have been proposed for wireless mesh networks. Among them the 802.11s proposes a Hybrid Wireless mesh Protocol HWMP. This protocol combines the functionalities of the Radio Metric Ad-hoc On demand Distance Vector protocol RM-AODV and the Tree Based Routing protocol TBR. In this work we propose to evaluate the scalability of the HWMP using network simulator NS2. For this purpose we used a grid wide network topologies with n*n static Mesh Point MP routers. The simulation results show a very interesting result related to the loss rate, path establishment delay, network throughput and signaling overhead.","PeriodicalId":300247,"journal":{"name":"2009 Mediterrannean Microwave Symposium (MMS)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125739328","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}
Pub Date : 2009-11-01DOI: 10.1109/MMS.2009.5409810
Yifei Li, P. Herczfeld
In this paper we describe the design of a microwave receiver in which photonic components replace analog microwave circuitry. The receiver is targeted to provide a spurious free dynamic range of ∼140dBHz⅔ and a signal to noise ratio of 7dB in the 0 to 20GHz range with a 4 GHz bandwidth.
{"title":"All-optical microwave receiver","authors":"Yifei Li, P. Herczfeld","doi":"10.1109/MMS.2009.5409810","DOIUrl":"https://doi.org/10.1109/MMS.2009.5409810","url":null,"abstract":"In this paper we describe the design of a microwave receiver in which photonic components replace analog microwave circuitry. The receiver is targeted to provide a spurious free dynamic range of ∼140dBHz⅔ and a signal to noise ratio of 7dB in the 0 to 20GHz range with a 4 GHz bandwidth.","PeriodicalId":300247,"journal":{"name":"2009 Mediterrannean Microwave Symposium (MMS)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133034451","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}
Pub Date : 2009-11-01DOI: 10.1109/MMS.2009.5409763
I. Issa, R. Rian, M. Essaaidi
In this paper, we achieved a very important gain improvement for a circularly polarized (CP) patch antenna using a new left handed medium (LHM) structure. To this end, a homogenization procedure of the LHM is carried out in order to design the patch antenna at a suitable frequency where the losses of the LHM are low. From the results we obtained, it is noted that in the presence of the LHM, the antenna is more directive and has a higher gain.
{"title":"Circularly polarized microstrip patch antenna gain improvement using new left-handed metamaterial structure","authors":"I. Issa, R. Rian, M. Essaaidi","doi":"10.1109/MMS.2009.5409763","DOIUrl":"https://doi.org/10.1109/MMS.2009.5409763","url":null,"abstract":"In this paper, we achieved a very important gain improvement for a circularly polarized (CP) patch antenna using a new left handed medium (LHM) structure. To this end, a homogenization procedure of the LHM is carried out in order to design the patch antenna at a suitable frequency where the losses of the LHM are low. From the results we obtained, it is noted that in the presence of the LHM, the antenna is more directive and has a higher gain.","PeriodicalId":300247,"journal":{"name":"2009 Mediterrannean Microwave Symposium (MMS)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129611807","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}
Pub Date : 2009-11-01DOI: 10.1109/MMS.2009.5409840
A. Tahiri, E. Egea-López, J. Vales-Alonso, J. García-Haro, M. Essaaidi
The deployment of wireless sensor network (WSN) forms a metric step to make the end of the desired system aim design. Deployment procedure can improve the information collected by giving more priority to the events which are more desired to be supervised; in addition, it can optimize the paths which link the network node among them as presented in this work. In this paper, we have improved the communication paths of an approach of optimal WSN deployment, in the aim to preserve the interest collected by the set of network nodes and improve the connectivity of the network.
{"title":"Optimizing the communication paths in optimal Wireless Sensor Network deployment","authors":"A. Tahiri, E. Egea-López, J. Vales-Alonso, J. García-Haro, M. Essaaidi","doi":"10.1109/MMS.2009.5409840","DOIUrl":"https://doi.org/10.1109/MMS.2009.5409840","url":null,"abstract":"The deployment of wireless sensor network (WSN) forms a metric step to make the end of the desired system aim design. Deployment procedure can improve the information collected by giving more priority to the events which are more desired to be supervised; in addition, it can optimize the paths which link the network node among them as presented in this work. In this paper, we have improved the communication paths of an approach of optimal WSN deployment, in the aim to preserve the interest collected by the set of network nodes and improve the connectivity of the network.","PeriodicalId":300247,"journal":{"name":"2009 Mediterrannean Microwave Symposium (MMS)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130226943","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}
Pub Date : 2009-11-01DOI: 10.1109/MMS.2009.5409786
G. Gragnani
A closed-form expansion of radiating and non-radiating currents is used in an equivalent inverse source problem, in order to solve the original inverse scattering problem and provide a method for electromagnetic imaging. Preliminary numerical investigation are performed by using a mixed inverse-direct scattering approach. Simulations show the limitations related to the radiating part of the solution and the possible enhancement given by using the non-radiating part. The capabilities of this approach in achieving a good solution to an inverse scattering problem are evaluated and discussed.
{"title":"Electromagnetic imaging using closed-form radiating and non-radiating currents","authors":"G. Gragnani","doi":"10.1109/MMS.2009.5409786","DOIUrl":"https://doi.org/10.1109/MMS.2009.5409786","url":null,"abstract":"A closed-form expansion of radiating and non-radiating currents is used in an equivalent inverse source problem, in order to solve the original inverse scattering problem and provide a method for electromagnetic imaging. Preliminary numerical investigation are performed by using a mixed inverse-direct scattering approach. Simulations show the limitations related to the radiating part of the solution and the possible enhancement given by using the non-radiating part. The capabilities of this approach in achieving a good solution to an inverse scattering problem are evaluated and discussed.","PeriodicalId":300247,"journal":{"name":"2009 Mediterrannean Microwave Symposium (MMS)","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128517488","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}
Pub Date : 2009-11-01DOI: 10.1109/MMS.2009.5409779
A. Jamali, N. Naja, D. El Ouadghiri, R. Benaini
until now, in the traditional IP network, the data packets take systematically the shortest path between two nodes through a core network. However, this system presents a major inconvenience: all the traffic follows the shortest path to go from the source to the destination. So the clutter state in a part of the network will be problematic. Today the new technology MPLS-TE permits to share the data according to the available resources in networks to guarantee the quality of service. Therefore, every packet will on label to assure a strict control according to the associated ticket, and the portion of the traffic can be deviated to some paths according to the rules of the mechanism MPLS-TE and constraints required by the operator. In this article, we modify the MPLS module, we propose MPLS-M to increase the throughput and reduce the number of lost packets.
{"title":"Improving quality of service (QoS) in Multi-Protocol Label switching module","authors":"A. Jamali, N. Naja, D. El Ouadghiri, R. Benaini","doi":"10.1109/MMS.2009.5409779","DOIUrl":"https://doi.org/10.1109/MMS.2009.5409779","url":null,"abstract":"until now, in the traditional IP network, the data packets take systematically the shortest path between two nodes through a core network. However, this system presents a major inconvenience: all the traffic follows the shortest path to go from the source to the destination. So the clutter state in a part of the network will be problematic. Today the new technology MPLS-TE permits to share the data according to the available resources in networks to guarantee the quality of service. Therefore, every packet will on label to assure a strict control according to the associated ticket, and the portion of the traffic can be deviated to some paths according to the rules of the mechanism MPLS-TE and constraints required by the operator. In this article, we modify the MPLS module, we propose MPLS-M to increase the throughput and reduce the number of lost packets.","PeriodicalId":300247,"journal":{"name":"2009 Mediterrannean Microwave Symposium (MMS)","volume":"76 46","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134196651","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}
Pub Date : 2009-11-01DOI: 10.1109/MMS.2009.5409814
I.J.F. Freitas, C. H. Silva-Santos, M. Hernandez, H. Hernandez Figueroa
This work presents a grid environment, based on UNICORE 6 middleware, which was used to analyze their security levels, compatibility with other middlewares and the resources available to integrate, visualize and manage different computational electromagnetic applications. The flexibility and performance of this approach is presented in two examples. Fist, a multiplatform CAD software developed in Java to design electromagnetic devices was encapsulated in this environment. The second application encapsulates a parallel FDTD 3D code developed in C++ and processed in a computer cluster. The results show the grid's high performance, efficiency, management easiness and portability, characterizing it as an important tool to share computational resources and to reuse them.
{"title":"Grid computing to improve performance and management of distributed electromagnetic applications","authors":"I.J.F. Freitas, C. H. Silva-Santos, M. Hernandez, H. Hernandez Figueroa","doi":"10.1109/MMS.2009.5409814","DOIUrl":"https://doi.org/10.1109/MMS.2009.5409814","url":null,"abstract":"This work presents a grid environment, based on UNICORE 6 middleware, which was used to analyze their security levels, compatibility with other middlewares and the resources available to integrate, visualize and manage different computational electromagnetic applications. The flexibility and performance of this approach is presented in two examples. Fist, a multiplatform CAD software developed in Java to design electromagnetic devices was encapsulated in this environment. The second application encapsulates a parallel FDTD 3D code developed in C++ and processed in a computer cluster. The results show the grid's high performance, efficiency, management easiness and portability, characterizing it as an important tool to share computational resources and to reuse them.","PeriodicalId":300247,"journal":{"name":"2009 Mediterrannean Microwave Symposium (MMS)","volume":"120 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134406055","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}
Pub Date : 2009-11-01DOI: 10.1109/MMS.2009.5409828
H. Ur Rahman, K. Y. Chan, R. Ramer
Any film which is deposited during the fabrication undergoes some form of stress. It can be either a compressive stress or tensile stress. It is important to have right value of either compressive or tensile stress for the particular application. In this paper we present an investigation of the stresses generated by the gold thin film during the fabrication process of RF MEMS switches. During the fabrication of RF MEMS series switches a small value of tensile stress is intentionally generated so that beam does not lead to stiction after final release. We are also briefly presenting a new mathematical model for calculation of the spring constant of the beam structures. The method we used is based on the Euler-Bernoulli beam equations. The spring constants calculated for two new beam designs were 3.37N/m and 3.31N/m respectively.
{"title":"Investigation of residual stress effects and modeling of spring constant for RF MEMS switches","authors":"H. Ur Rahman, K. Y. Chan, R. Ramer","doi":"10.1109/MMS.2009.5409828","DOIUrl":"https://doi.org/10.1109/MMS.2009.5409828","url":null,"abstract":"Any film which is deposited during the fabrication undergoes some form of stress. It can be either a compressive stress or tensile stress. It is important to have right value of either compressive or tensile stress for the particular application. In this paper we present an investigation of the stresses generated by the gold thin film during the fabrication process of RF MEMS switches. During the fabrication of RF MEMS series switches a small value of tensile stress is intentionally generated so that beam does not lead to stiction after final release. We are also briefly presenting a new mathematical model for calculation of the spring constant of the beam structures. The method we used is based on the Euler-Bernoulli beam equations. The spring constants calculated for two new beam designs were 3.37N/m and 3.31N/m respectively.","PeriodicalId":300247,"journal":{"name":"2009 Mediterrannean Microwave Symposium (MMS)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129359927","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}
Pub Date : 2009-11-01DOI: 10.1109/MMS.2009.5409789
F. Romdhani, Mohsen Denden, A. Samet
This paper presents an application of the planar model approach to the design of reconfigurable dipole antenna. The model of the whole antenna consists of a planar structure connected via a microstrip line which guarantees a continuous excitation. For this we have to use the commercial electromagnetic software ADS (Momentum) based on the method of moments (MoM) to investigate the electromagnetic behaviour of this antenna. The behavior of the resonant frequency as a function of the position and the dimension of a lumped element is studied in depth. Furthermore, the effects of finite metallization thickness and losses are also investigated in detail.
{"title":"A printed reconfigurable antenna for communication system","authors":"F. Romdhani, Mohsen Denden, A. Samet","doi":"10.1109/MMS.2009.5409789","DOIUrl":"https://doi.org/10.1109/MMS.2009.5409789","url":null,"abstract":"This paper presents an application of the planar model approach to the design of reconfigurable dipole antenna. The model of the whole antenna consists of a planar structure connected via a microstrip line which guarantees a continuous excitation. For this we have to use the commercial electromagnetic software ADS (Momentum) based on the method of moments (MoM) to investigate the electromagnetic behaviour of this antenna. The behavior of the resonant frequency as a function of the position and the dimension of a lumped element is studied in depth. Furthermore, the effects of finite metallization thickness and losses are also investigated in detail.","PeriodicalId":300247,"journal":{"name":"2009 Mediterrannean Microwave Symposium (MMS)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121918210","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}
Pub Date : 2009-11-01DOI: 10.1109/MMS.2009.5409832
M. Jalali, Mohamad Naser Moghaddasi, Alireza Habibzadeh
In this article we simulate four famous algorithms in DOA and then compare the algorithms based on their finding and estmating of the accuracy level angels from two different users, having demonstrated the result of simulation of the four algorithms in comparison tables, it is observed that ROOT-MUSIC algorithm have high level of accuracy in estimation of close angles(28, 30 degrees). MUSIC, Spatially Smoothed and ML algorithms have the next steps in accuracy respectively.
{"title":"Comparing accuracy for ML, MUSIC, ROOT-MUSIC and spatially smoothed algorithms for 2 users","authors":"M. Jalali, Mohamad Naser Moghaddasi, Alireza Habibzadeh","doi":"10.1109/MMS.2009.5409832","DOIUrl":"https://doi.org/10.1109/MMS.2009.5409832","url":null,"abstract":"In this article we simulate four famous algorithms in DOA and then compare the algorithms based on their finding and estmating of the accuracy level angels from two different users, having demonstrated the result of simulation of the four algorithms in comparison tables, it is observed that ROOT-MUSIC algorithm have high level of accuracy in estimation of close angles(28, 30 degrees). MUSIC, Spatially Smoothed and ML algorithms have the next steps in accuracy respectively.","PeriodicalId":300247,"journal":{"name":"2009 Mediterrannean Microwave Symposium (MMS)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125044466","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}
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