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IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005.最新文献

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UWB sampler for wireless communications and radar 用于无线通信和雷达的超宽带采样器
IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005. Pub Date : 2005-04-03 DOI: 10.1109/WCACEM.2005.1469522
Jeongwoo Han, C. Nguyen
{"title":"UWB sampler for wireless communications and radar","authors":"Jeongwoo Han, C. Nguyen","doi":"10.1109/WCACEM.2005.1469522","DOIUrl":"https://doi.org/10.1109/WCACEM.2005.1469522","url":null,"abstract":"An ultra wideband (UWB) sampler, realized using step recovery and Schottky diodes on coplanar waveguide, coplanar strips and slotlines, has been developed for UWB wireless communications and radar systems. The impulse generator, providing signal for the sampling gate, was also included along with a new LO feeding structure. The fabricated circuit shows 16-19 dB conversion loss without amplifier and 1-4 dB conversion gain with amplifier across a 9-GHz RF bandwidth with 500-MHz sampling frequency.","PeriodicalId":368249,"journal":{"name":"IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005.","volume":"210 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114366733","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
Numerical dispersion of the 2-D ADI-FDTD method 二维ADI-FDTD方法的数值色散
IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005. Pub Date : 2005-04-03 DOI: 10.1109/WCACEM.2005.1469577
Q. Chu, Linnian Wang, ZhiHui Chen
{"title":"Numerical dispersion of the 2-D ADI-FDTD method","authors":"Q. Chu, Linnian Wang, ZhiHui Chen","doi":"10.1109/WCACEM.2005.1469577","DOIUrl":"https://doi.org/10.1109/WCACEM.2005.1469577","url":null,"abstract":"A novel dispersion formulation of the two-dimensional ADI-FDTD is presented. The results are good compared with the numerical experiment results.","PeriodicalId":368249,"journal":{"name":"IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005.","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116310004","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
Adaptive M-QAM modulation for MIMO systems MIMO系统的自适应M-QAM调制
IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005. Pub Date : 2005-04-03 DOI: 10.1109/WCACEM.2005.1469530
R. Gowrishankar, M. Demirkol
{"title":"Adaptive M-QAM modulation for MIMO systems","authors":"R. Gowrishankar, M. Demirkol","doi":"10.1109/WCACEM.2005.1469530","DOIUrl":"https://doi.org/10.1109/WCACEM.2005.1469530","url":null,"abstract":"Adaptive modulation substantially increases the throughput of a wireless network by adjusting the modulation index to the channel conditions. In this paper, we propose algorithms for implementing adaptive M-QAM modulation for both OL- and CL-MIMO systems. The goal is to maximize the throughput subject to a target BER constraint. For OL-MIMO, the algorithm proposed finds the number of transmit antennas and the modulation index to be used for all streams. For CL-MIMO, the authors propose a new rate maximization scheme that, on the average, has 23% throughput improvement over OL-MIMO. The authors modify the water-filling and MMSE solutions to accommodate adaptive modulation and BER constraints. Flat Rayleigh-fading channel model is used in the simulations and assumes a perfect channel estimation.","PeriodicalId":368249,"journal":{"name":"IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005.","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121476038","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
Modeling antennas on automobiles in the VHF and UHF frequency bands, comparisons of predictions and measurements VHF和UHF频段的汽车天线建模，预测和测量的比较
IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005. Pub Date : 2005-04-03 DOI: 10.1109/WCACEM.2005.1469550
Nicholas DeMinco
{"title":"Modeling antennas on automobiles in the VHF and UHF frequency bands, comparisons of predictions and measurements","authors":"Nicholas DeMinco","doi":"10.1109/WCACEM.2005.1469550","DOIUrl":"https://doi.org/10.1109/WCACEM.2005.1469550","url":null,"abstract":"This paper describes comparisons of analysis and measurements of antenna patterns on automobiles in the VHF and UHF frequency bands. The actual measurements and analysis were performed at six different frequencies ranging from 41 MHz to 918 MHz. An antenna on a vehicle in a roadway environment in the presence of Earth does not have antenna patterns or input impedances as if it were located in free space or over a perfectly conducting ground plane. Antenna patterns of a whip antenna on a vehicle were measured on an outdoor antenna range with the vehicle on a 10 meter diameter turntable. Patterns were also measured with the vehicle over real ground away from the turntable to determine the effects of the steel turntable on antenna patterns. The three-antenna gain measurement technique was used to measure antenna gain. The measured patterns and gains were compared to predictions using the numerical electromagnetics code (NEC-4) [G.J. Burke, Jan 1992].","PeriodicalId":368249,"journal":{"name":"IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005.","volume":"113 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124354720","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
On MIMO signal processing for adaptive W-CDMA and OFDM wireless transceivers 自适应W-CDMA和OFDM无线收发器的MIMO信号处理
IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005. Pub Date : 2005-04-03 DOI: 10.1109/WCACEM.2005.1469528
D. Cabric, D. Markovic, R. Brodersen
{"title":"On MIMO signal processing for adaptive W-CDMA and OFDM wireless transceivers","authors":"D. Cabric, D. Markovic, R. Brodersen","doi":"10.1109/WCACEM.2005.1469528","DOIUrl":"https://doi.org/10.1109/WCACEM.2005.1469528","url":null,"abstract":"In this paper, we consider wideband extensions of narrowband signal processing techniques for MIMO wireless transceivers. The extensions are applied and analyzed on commonly used wideband systems such as W-CDMA and OFDM. We focus on signal processing techniques for channel estimation and correction, including pilot-aided and decision-directed LMS-based adaptive estimation. Simulation study compares cases with one and two transmit/receive antennas and shows that BER of W-CDMA system consistently improves by exploiting multi-path diversity through additional antenna at the receiver, while additional transmit antenna is beneficial under specific channel conditions. BER performance in OFDM is more sensitive to the value of the channel's smallest eigen-value than to the eigen-spread. In most practical cases, therefore, the sub-channels with small eigen-values are not usable due to poor BER.","PeriodicalId":368249,"journal":{"name":"IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005.","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124066754","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
An efficient wave propagation model for simulation and analysis of multipath effects of mobile users in indoor and urban environment 一种用于室内和城市环境中移动用户多径效应仿真与分析的有效波传播模型
IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005. Pub Date : 2005-04-03 DOI: 10.1109/WCACEM.2005.1469707
S. Hall, J. Chen, S. Venkatesan
{"title":"An efficient wave propagation model for simulation and analysis of multipath effects of mobile users in indoor and urban environment","authors":"S. Hall, J. Chen, S. Venkatesan","doi":"10.1109/WCACEM.2005.1469707","DOIUrl":"https://doi.org/10.1109/WCACEM.2005.1469707","url":null,"abstract":"In this paper, we present an efficient wave propagation model that supports both urban canyon and urban canyon situated indoor propagation based on a hybrid of the ray tracing and finite volume/finite difference time domain methods. The model is provided in a high-performance compact terrain database (CTDB) format with multi-elevation structure for use in high-resolution dynamic simulators. The effect of multipath propagation on the multiple access methods and the comparison of the WCDMA receiver against that of the UFO receiver in the urban setting is discussed. Simulation includes the bit-error-rate for a given satellite power, and the power needed at the satellite for a given bit-error-rate subject to the maximum beam power, which determines the relative fraction of the total time the signal is acquired for the two models. the simulation results of access control or power control based on urban multipath environment are also presented.","PeriodicalId":368249,"journal":{"name":"IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005.","volume":"135 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127595665","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
Invited paper - hybrid simulation of electrically large millimeter-wave antennas 邀请纸混合模拟电大型毫米波天线
IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005. Pub Date : 2005-04-03 DOI: 10.1109/WCACEM.2005.1469635
S. Franson
{"title":"Invited paper - hybrid simulation of electrically large millimeter-wave antennas","authors":"S. Franson","doi":"10.1109/WCACEM.2005.1469635","DOIUrl":"https://doi.org/10.1109/WCACEM.2005.1469635","url":null,"abstract":"This paper describes the simulation of an electrically large parabolic antenna fed by a horn antenna at millimeter-wave frequencies. Due to the fact that the feed needs to be simulated using a highly accurate simulation method, while the parabolic dish can be simulated with a physical optics approximation, a hybrid approach is needed. This paper describes a comparison of different approaches using a commercially available tool which makes use of a hybrid simulation approach. Time saving approaches is described, as well as methods to easily simulate variations in the design.","PeriodicalId":368249,"journal":{"name":"IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005.","volume":"562 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131453970","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
A frequency-selectable patch antenna of circular polarization with integrated MEMS switches 集成MEMS开关的圆极化可选频率贴片天线
IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005. Pub Date : 2005-04-03 DOI: 10.1109/WCACEM.2005.1469560
Sun-chih Liu, Ming-Jer Lee, M. Bachman, G. Li, F. De Flaviis
{"title":"A frequency-selectable patch antenna of circular polarization with integrated MEMS switches","authors":"Sun-chih Liu, Ming-Jer Lee, M. Bachman, G. Li, F. De Flaviis","doi":"10.1109/WCACEM.2005.1469560","DOIUrl":"https://doi.org/10.1109/WCACEM.2005.1469560","url":null,"abstract":"A microstrip patch antenna with integrated RF microelectromechanical system (MEMS) switches is proposed and demonstrated to operate at dual frequencies with circular polarization. The switches are incorporated into the diagonally-fed square patch for controlling the operation frequency and a rectangular stub attached to the edge of the patch acts as the perturbation to produce the circular polarization at 6.69 GHz and 7.06 GHz.","PeriodicalId":368249,"journal":{"name":"IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005.","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132374538","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
A vectorial analysis of UHF propagation in a three-dimensional multislit street waveguide 超高频在三维多狭缝街道波导中的传播矢量分析
IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005. Pub Date : 2005-04-03 DOI: 10.1109/WCACEM.2005.1469706
E. Júnior, G. Carrijo
{"title":"A vectorial analysis of UHF propagation in a three-dimensional multislit street waveguide","authors":"E. Júnior, G. Carrijo","doi":"10.1109/WCACEM.2005.1469706","DOIUrl":"https://doi.org/10.1109/WCACEM.2005.1469706","url":null,"abstract":"The purpose of this paper is to derive a three-dimensional waveguide model with urban characteristics as well as its variations and comparisons. The three-dimensional waveguide contains transmitting and receiving antennas. Four kinds of generalization for reflections on the lateral borders of a three-dimensional (3D) waveguide are discussed.","PeriodicalId":368249,"journal":{"name":"IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005.","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134060174","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
HSDPA capacity enhancement using MIMO in a pico-cell environment 在微蜂窝环境中使用MIMO增强HSDPA容量
IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005. Pub Date : 2005-04-03 DOI: 10.1109/WCACEM.2005.1469667
P. Vieira, M. Queluz, A. Rodrigues
{"title":"HSDPA capacity enhancement using MIMO in a pico-cell environment","authors":"P. Vieira, M. Queluz, A. Rodrigues","doi":"10.1109/WCACEM.2005.1469667","DOIUrl":"https://doi.org/10.1109/WCACEM.2005.1469667","url":null,"abstract":"The concept of high speed downlink packet access (HSDPA) has been standardized in 3GPP for UMTS (Universal Mobile Telecommunication System). The main interest of this paper is the application of MIMO (multiple-input-multiple-output) techniques in order to achieve high data rates in HSDPA. The capacity increase available from deploying MIMO systems is obtained via the potential decorrelation between the channel coefficients of the MIMO radio channel, which can be used to create several parallel sub-channels. Along with the MIMO technique, it is mandatory to provide a metric of the channel, to be transmitted in the feedback channel by the UE (user equipment), useful for the node B (UMTS base station) to adapt the downlink transmission rate.","PeriodicalId":368249,"journal":{"name":"IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005.","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133913356","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
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