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2007 European Conference on Wireless Technologies最新文献

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High Efficiency Distributed Amplifier Using Optimum Transmission Line 采用最佳传输线的高效分布式放大器
2007 European Conference on Wireless Technologies Pub Date : 2007-12-17 DOI: 10.1109/ECWT.2007.4404023
Sigyun Jeong, Heungjae Choi, Y. Jeong, J. Kenney, C. Kim
{"title":"High Efficiency Distributed Amplifier Using Optimum Transmission Line","authors":"Sigyun Jeong, Heungjae Choi, Y. Jeong, J. Kenney, C. Kim","doi":"10.1109/ECWT.2007.4404023","DOIUrl":"https://doi.org/10.1109/ECWT.2007.4404023","url":null,"abstract":"In this paper, we performed numerical analysis on reversed current of distributed amplifier (DA) based on transmission line theory and proposed optimum transmission line (OTL) to cancel reversed currents. This OTL has improved electrical performances of DA. The distributed amplifier using optimum transmission line (DAOTL) has been implemented with pHEMT transistor. Due to high capacitance of pHEMT, cutoff frequency is decided to 3.6 GHz. As a result of measurement, we could obtain maximum gain of 14.5 dB and minimum gain of 12.8 dB inner operation band. Moreover, we could PAE of 25.6% which is higher about 7.6% than the conventional DA (CDA) at 3 GHz. The output power was obtained 10.9 dBm which is higher about 1.7 dB than the conventional at 3 GHz.","PeriodicalId":448587,"journal":{"name":"2007 European Conference on Wireless Technologies","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130612852","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
Reduction of 3×3 MIMO volume requirements by using true polarization diversity techniques 利用真极化分集技术降低3×3 MIMO体积要求
2007 European Conference on Wireless Technologies Pub Date : 2007-10-01 DOI: 10.1109/ECWT.2007.4403972
J. Valenzuela-Valdés, A. Martinez-Gonzalez, D. Sánchez-Hernández
{"title":"Reduction of 3×3 MIMO volume requirements by using true polarization diversity techniques","authors":"J. Valenzuela-Valdés, A. Martinez-Gonzalez, D. Sánchez-Hernández","doi":"10.1109/ECWT.2007.4403972","DOIUrl":"https://doi.org/10.1109/ECWT.2007.4403972","url":null,"abstract":"Polarization diversity techniques have not received as much attention as others due to the significant difference in mean signal level between co-polarized and cross-polarized branches when one polarization is transmitted. However, MIMO systems where the multipath fading is only partially correlated could use polarization diversity to provide a high diversity gain. In this contribution, progressive (hue) polarization diversity performance for 3times3 MIMO systems under Rayleigh-fading environments is evaluated through simulations and measurements in a reverberation chamber. True polarization diversity was found to be as significant as spatial diversity at improving diversity gain, and hence MIMO system capacity.","PeriodicalId":448587,"journal":{"name":"2007 European Conference on Wireless Technologies","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124484190","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
Versatile automobile antenna unit for roadside communication 用于路边通信的多功能汽车天线单元
2007 European Conference on Wireless Technologies Pub Date : 2007-10-01 DOI: 10.1109/ECWT.2007.4403984
I. Jensen, J. Gamage
{"title":"Versatile automobile antenna unit for roadside communication","authors":"I. Jensen, J. Gamage","doi":"10.1109/ECWT.2007.4403984","DOIUrl":"https://doi.org/10.1109/ECWT.2007.4403984","url":null,"abstract":"The main goal for the CVIS (Cooperative Vehicle-Infrastructure System) project is to create a wireless network between vehicle and roadside infrastructure. CVTS includes implementation of technology components, to develop a multichannel terminal. This terminal will be installed in a vehicle, and in this paper we report on the development of the Rooftop Antenna Unit. The antenna unit contains 5 individual antennas, including two WLAN antennas. The WLAN antenna is a broadband double-fed printed monopole antenna designed and optimized within the CVIS project. It covers the frequency band 2.0-6.7 GHz, a bandwidth of 128%. The Rooftop Antenna Unit will be used for the CVIS field trials, taking place at six different test sites throughout Europe.","PeriodicalId":448587,"journal":{"name":"2007 European Conference on Wireless Technologies","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128911415","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
Baseband to baseband calibration of a MIMO wireless system MIMO无线系统的基带到基带校准
2007 European Conference on Wireless Technologies Pub Date : 2007-10-01 DOI: 10.1109/ECWT.2007.4403966
K. Mabrouk, B. Huyart, X. Begaud, A. Mohammed
{"title":"Baseband to baseband calibration of a MIMO wireless system","authors":"K. Mabrouk, B. Huyart, X. Begaud, A. Mohammed","doi":"10.1109/ECWT.2007.4403966","DOIUrl":"https://doi.org/10.1109/ECWT.2007.4403966","url":null,"abstract":"In this paper, a MIMO transmission channel estimation method from baseband to baseband is proposed. For that, a new frame and symbol synchronization technique using five-port receivers output voltages is applied thanks to particular training sequences.","PeriodicalId":448587,"journal":{"name":"2007 European Conference on Wireless Technologies","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117271083","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
Narrow-Band Jamming Mitigation Using Intelligent FDSS System with Triangular Input Pulses 基于三角形输入脉冲的智能FDSS系统窄带干扰抑制
2007 European Conference on Wireless Technologies Pub Date : 2007-10-01 DOI: 10.1109/ECWT.2007.4403975
B. Taha-Ahmed
{"title":"Narrow-Band Jamming Mitigation Using Intelligent FDSS System with Triangular Input Pulses","authors":"B. Taha-Ahmed","doi":"10.1109/ECWT.2007.4403975","DOIUrl":"https://doi.org/10.1109/ECWT.2007.4403975","url":null,"abstract":"The performance of the intelligent frequency diversity spread spectrum (IFDSS) system for mitigating a narrow band jammer is given. It is found that the IFDSS system can survive as a cellular system when (J/S)initial < 93.6 dB. It is found that, the IFDSS system has a jamming mitigation margin of 75.6 dB higher than the conventional W-CDMA system.","PeriodicalId":448587,"journal":{"name":"2007 European Conference on Wireless Technologies","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126342793","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
GALANT - Galileo Antenna and Receiver Demonstrator for Safety-Critical Applications GALANT -用于安全关键应用的伽利略天线和接收机演示
2007 European Conference on Wireless Technologies Pub Date : 2007-02-25 DOI: 10.1109/ECWT.2007.4403945
M. Cuntz, A. Konovaltsev, A. Hornbostel, E. S. Neves, A. Dreher
{"title":"GALANT - Galileo Antenna and Receiver Demonstrator for Safety-Critical Applications","authors":"M. Cuntz, A. Konovaltsev, A. Hornbostel, E. S. Neves, A. Dreher","doi":"10.1109/ECWT.2007.4403945","DOIUrl":"https://doi.org/10.1109/ECWT.2007.4403945","url":null,"abstract":"The DLR Institute of Communications and Navigation has started to develop an antenna and receiver demonstrator, called GALANT. This paper provides an overview about the structure and the main objectives of the demonstrator development.","PeriodicalId":448587,"journal":{"name":"2007 European Conference on Wireless Technologies","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128758217","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: 9
GaN HEMT Based Doherty Amplifier for 3.5-GHz WiMAX Applications 3.5 ghz WiMAX应用中基于GaN HEMT的多尔蒂放大器
2007 European Conference on Wireless Technologies Pub Date : 1900-01-01 DOI: 10.1109/eumc.2007.4405413
J. Moon, Jangheon Kim, Ildu Kim, Y. Woo, Sungchul Hong, H. Kim, Jong Sung Lee, Bumman Kim
{"title":"GaN HEMT Based Doherty Amplifier for 3.5-GHz WiMAX Applications","authors":"J. Moon, Jangheon Kim, Ildu Kim, Y. Woo, Sungchul Hong, H. Kim, Jong Sung Lee, Bumman Kim","doi":"10.1109/eumc.2007.4405413","DOIUrl":"https://doi.org/10.1109/eumc.2007.4405413","url":null,"abstract":"We have implemented a Doherty amplifier for 3.5-GHz World Interoperability for Microwave Access (WiMAX) applications using Eudyna 90-W (P3dB) Gallium-Nitride (GaN) High Electron Mobility Transistor (HEMT) because of the poor efficiency of a standard class AB amplifier when the linearity performance is good. The load modulation performance of the GaN HEMT device for the Doherty operation is rather moderate but workable. The linearity is improved using the in-band error cancellation technique of the Doherty amplifier. The implemented Doherty amplifier has been designed at an average output power of 43 dBm, backed-off about 8 dB from the 51 dBm (P3dB). For WiMAX signal with 28 MHz signal bandwidth, the measured drain efficiency of the amplifier is 27.8%, and the measured Relative Constellation Error (RCE) is -33.17 dB, while those of the comparable class AB amplifier are 19.42% and -24.26 dB, respectively, at the same average output power level.","PeriodicalId":448587,"journal":{"name":"2007 European Conference on Wireless Technologies","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122740047","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
Backplane equalization comparison for 10-gb/s data communication with 0.25-μm sige bicmos and 0.18-μm cmos feed-forward equalizers 采用0.25-μm cmos和0.18 μm cmos前馈均衡器进行10gb /s数据通信的背板均衡比较
2007 European Conference on Wireless Technologies Pub Date : 1900-01-01 DOI: 10.1109/ecwt.2007.4404021
H. Kim, A. Raghavan, E. Gebara, J. Laskar
{"title":"Backplane equalization comparison for 10-gb/s data communication with 0.25-μm sige bicmos and 0.18-μm cmos feed-forward equalizers","authors":"H. Kim, A. Raghavan, E. Gebara, J. Laskar","doi":"10.1109/ecwt.2007.4404021","DOIUrl":"https://doi.org/10.1109/ecwt.2007.4404021","url":null,"abstract":"Two feed-forward equalizers are designed to improve high data rate signal transmission in backplanes. They are fabricated in 0.18-Backplane equalization comparison for 10-Gb/s data communication with 0.25-μm SiGe BiCMOS and 0.18-μm CMOS feed-forward equalizers m CMOS and 0.25-Backplane equalization comparison for 10-Gb/s data communication with 0.25-μm SiGe BiCMOS and 0.18-μm CMOS feed-forward equalizers m SiGe BiCMOS technology respectively. The system specification for the two equalizers is similar and they both address 10-Gb/s data rate transmission. Analog multiplier cells, active delay units and output buffers comprise the building blocks of each FFE. A comparison of the two equalizers is conducted with reference to design topology. The impact of technology on key performance parameters such as delay and gain is discussed. When a 10-Gb/s non-return to zero signal is received through a 20-inch backplane, it is found that both equalizers successfully improve signal integrity by channel equalization. The BiCMOS FFE exhibits better performance as compared to the CMOS FFE but also dissipates more DC power.","PeriodicalId":448587,"journal":{"name":"2007 European Conference on Wireless Technologies","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122275662","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
Outphasing Power Amplifier Design Investigations for 2.5G and 3G Standards 2.5G和3G标准的同相功率放大器设计研究
2007 European Conference on Wireless Technologies Pub Date : 1900-01-01 DOI: 10.1109/ecwt.2007.4404027
E. Napieralska, M. Zannoth, G. Kraut, W. Bakalski, E. Biebl, K. Kitlinski
{"title":"Outphasing Power Amplifier Design Investigations for 2.5G and 3G Standards","authors":"E. Napieralska, M. Zannoth, G. Kraut, W. Bakalski, E. Biebl, K. Kitlinski","doi":"10.1109/ecwt.2007.4404027","DOIUrl":"https://doi.org/10.1109/ecwt.2007.4404027","url":null,"abstract":"This paper presents investigations on outphasing power amplifier realizations based on a 2-stage 0.35 mum SiGe-bipolar PA design for 850 MHz and 1800 MHz. A Chireix combiner, a 90deg hybrid coupler and a Wilkinson power combiner were designed and all types were characterized in terms of efficiency and linearity for the usage in mobile phone applications.","PeriodicalId":448587,"journal":{"name":"2007 European Conference on Wireless Technologies","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115496201","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
Multi-dielectric Layer Multi-patches Microstrip Antenna for UWB Applications 用于超宽带的多介电层多贴片微带天线
2007 European Conference on Wireless Technologies Pub Date : 1900-01-01 DOI: 10.1109/ecwt.2007.4403996
Nasimuddin, Zhi Ning Chen, T. See, X. Qing
{"title":"Multi-dielectric Layer Multi-patches Microstrip Antenna for UWB Applications","authors":"Nasimuddin, Zhi Ning Chen, T. See, X. Qing","doi":"10.1109/ecwt.2007.4403996","DOIUrl":"https://doi.org/10.1109/ecwt.2007.4403996","url":null,"abstract":"A wideband compact multilayer microstrip antenna with a new feeding arrangement is presented for ultra-wideband (UWB) applications. The antenna consists of a driven patch radiator and 5 stacked parasitic radiators. A new feeding technique is proposed to enhance the impedance bandwidth of the antenna structure. The feeding structure consists a via connected to a microstrip line which excites the patch radiator in a broadband manner. In order to achieve UWB performance, parasitic patches are electromagnetically coupled to the driven patch in the multilayered microstrip structures. The proposed antenna has a measured 10-dB return loss bandwidth of 48% and directional radiation, which covers the lower UWB band very well. The maximum gain is more than 6.5 dBi across the bandwidth. Furthermore, the proposed broadband structure can be deployed in a space-limited environment and multi-dielectric layer antenna applications.","PeriodicalId":448587,"journal":{"name":"2007 European Conference on Wireless Technologies","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115782212","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
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