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2013 IEEE International Wireless Symposium (IWS)最新文献

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On the bandwidth performance of Doherty amplifiers Doherty放大器的带宽性能
2013 IEEE International Wireless Symposium (IWS) Pub Date : 2013-04-14 DOI: 10.1109/IEEE-IWS.2013.6616839
L. D. de Vreede, R. Gajadharsing, W. Neo
{"title":"On the bandwidth performance of Doherty amplifiers","authors":"L. D. de Vreede, R. Gajadharsing, W. Neo","doi":"10.1109/IEEE-IWS.2013.6616839","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2013.6616839","url":null,"abstract":"The theoretical bandwidth constrains of conventional symmetric and asymmetric Doherty amplifiers are evaluated and compared to those of the recently introduced novel three and 4-way Doherty amplifier configurations. Performance trends are identified and backed-up by practical results.","PeriodicalId":344851,"journal":{"name":"2013 IEEE International Wireless Symposium (IWS)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114995688","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
Reduction of baseband electrical memory effects using broadband active baseband load-pull 利用宽带有源基带负载-拉减少基带电记忆效应
2013 IEEE International Wireless Symposium (IWS) Pub Date : 2013-04-14 DOI: 10.1109/IEEE-IWS.2013.6616709
M. Chaudhary, J. Lees, J. Benedikt, P. Tasker
{"title":"Reduction of baseband electrical memory effects using broadband active baseband load-pull","authors":"M. Chaudhary, J. Lees, J. Benedikt, P. Tasker","doi":"10.1109/IEEE-IWS.2013.6616709","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2013.6616709","url":null,"abstract":"This paper presents an enhanced active baseband load-pull capability that allows constant, frequency independent baseband load environments to be presented across wide modulation bandwidths. This capability is critical in allowing the effects of baseband impedance variation has on the performance of nonlinear microwave devices, when are driven by broadband multi-tone stimuli, to be fully investigated. The experimental investigations were carried out using a 10W GaN HEMT device, under 9-carrier complex multi-tone excitation.","PeriodicalId":344851,"journal":{"name":"2013 IEEE International Wireless Symposium (IWS)","volume":"314 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115446674","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
Research and design of broadband horn antenna 宽带喇叭天线的研究与设计
2013 IEEE International Wireless Symposium (IWS) Pub Date : 2013-04-14 DOI: 10.1109/IEEE-IWS.2013.6616738
L. Jianhua, Zhou Yonggang, Zhu Jun
{"title":"Research and design of broadband horn antenna","authors":"L. Jianhua, Zhou Yonggang, Zhu Jun","doi":"10.1109/IEEE-IWS.2013.6616738","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2013.6616738","url":null,"abstract":"A novel design of dual-polarized broadband 6~18GHz horn antenna with low SWR (<;2), high gain (13dB~19.5dB) and high isolation (>25dB) is presented. Moreover, the designed antenna exhibits excellent far-field radiation characteristics in the entire operation bandwidth without beam splitting. Applying commercial software Ansoft HFSS, sensitivity analysis is taken with respect to the best antenna performance and manufacturing tolerance. Based on the results, we finally fabricated a sample, the measured results showed good performance.","PeriodicalId":344851,"journal":{"name":"2013 IEEE International Wireless Symposium (IWS)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122992001","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
Technology trends in mobile handsets 移动电话的技术趋势
2013 IEEE International Wireless Symposium (IWS) Pub Date : 2013-04-14 DOI: 10.1109/IEEE-IWS.2013.6616852
T. Gillenwater, M. Schindler
{"title":"Technology trends in mobile handsets","authors":"T. Gillenwater, M. Schindler","doi":"10.1109/IEEE-IWS.2013.6616852","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2013.6616852","url":null,"abstract":"The mobile handset is well established as a business and consumer device, expanding beyond the foundation built on earlier mobile handset technology. The functions and capabilities of the handset are continually evolving. Handset providers, application developers and users are putting ever greater demands on handsets which simultaneously strain limited battery power and require higher data transfer. This results in ever more challenging requirements on the RF front-end of the handset. At the same time there are cost pressures that require functions to be provided ever more economically. This paper discussed these trends, the implications in front-end architecture, and some of the advanced implementations that address these dynamics.","PeriodicalId":344851,"journal":{"name":"2013 IEEE International Wireless Symposium (IWS)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123694811","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
Generalized twin-nonlinear two-box digital predistorter for GaN based LTE Doherty power amplifiers with strong memory effects 基于GaN的强记忆效应LTE Doherty功率放大器的广义双非线性双盒数字预失真器
2013 IEEE International Wireless Symposium (IWS) Pub Date : 2013-04-14 DOI: 10.1109/IEEE-IWS.2013.6616813
O. Hammi, M. Sharawi, F. Ghannouchi
{"title":"Generalized twin-nonlinear two-box digital predistorter for GaN based LTE Doherty power amplifiers with strong memory effects","authors":"O. Hammi, M. Sharawi, F. Ghannouchi","doi":"10.1109/IEEE-IWS.2013.6616813","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2013.6616813","url":null,"abstract":"In this paper, a generalized twin-nonlinear two-box predistorter is proposed for the linearization of highly nonlinear Doherty power amplifiers exhibiting strong memory effects. The proposed predistorter is made of the cascade of a memoryless look-up table followed by a generalized memory polynomial function and thus can be seen as a two-box implementation of the generalized memory polynomial model. The generalized twin-nonlinear two-box predistorter is experimentally benchmarked against the generalized memory polynomial model. The linearization performances of both models when applied on a GaN based Doherty power amplifier driven by a 20MHz LTE signal, demonstrate the superiority of the proposed predistorter which achieves better linearity performance while requiring a lower number of coefficients. Indeed, an extra 5dB is obtained in the ACLR while the number of predistorter coefficients is reduced by more than 60%.","PeriodicalId":344851,"journal":{"name":"2013 IEEE International Wireless Symposium (IWS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115693710","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
Time domain analysis of transmission line based on WLP-FDTD 基于WLP-FDTD的输电线路时域分析
2013 IEEE International Wireless Symposium (IWS) Pub Date : 2013-04-14 DOI: 10.1109/IEEE-IWS.2013.6616723
Yalong Li, Xiaochun Li, Junfa Mao
{"title":"Time domain analysis of transmission line based on WLP-FDTD","authors":"Yalong Li, Xiaochun Li, Junfa Mao","doi":"10.1109/IEEE-IWS.2013.6616723","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2013.6616723","url":null,"abstract":"In this paper, a novel solution based on weighted Laguerre polynomials finite-difference time-domain (WLP-FDTD) method is proposed for time domain analysis of interconnect modeled as a transmission line. Compared with finite-difference time-domain (FDTD) method, which is an explicit scheme and limited by Courant condition, the WLP-FDTD method is unconditionally stable since the solution is implicit. Numerical results show that the proposed WLP-FDTD solution is as accurate as but much faster than conventional FDTD-based solutions.","PeriodicalId":344851,"journal":{"name":"2013 IEEE International Wireless Symposium (IWS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129567731","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
Accuracy-controlled convergence criterion for full wave simulation 全波模拟的精度控制收敛准则
2013 IEEE International Wireless Symposium (IWS) Pub Date : 2013-04-14 DOI: 10.1109/IEEE-IWS.2013.6616794
W. Ding, Gaofeng Wang, X. Chen
{"title":"Accuracy-controlled convergence criterion for full wave simulation","authors":"W. Ding, Gaofeng Wang, X. Chen","doi":"10.1109/IEEE-IWS.2013.6616794","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2013.6616794","url":null,"abstract":"Full wave electromagnetic (EM) simulations frequently encounter low-frequency breakdown: for decoupling of electric and magnetic fields in low frequency, the impedance matrix degenerates into near singular matrix and causes convergence problems. The iterative algorithms are currently the primary solvers of matrix equation for massive EM simulation. For absence of constraint between simulation accuracy and the convergence condition for iterative solver, excessively rigorous convergence condition has to be applied to ensure simulation accuracy, as a result, this way leads to over convergence, i.e., converge at unnecessarily high accuracy and simulation time doubly increases. By theoretically analyzing the impedance matrix, connection between simulation accuracy and the relative residual error which serves as the convergence condition in iterative solvers is established, and an accuracy-controlled convergence criterion is proposed. Numerical experiments are included to demonstrate that this convergence criterion effectively avoids the occurrence of over convergence yet insures simulation accuracy; therefore the simulation efficiency is visibly promoted.","PeriodicalId":344851,"journal":{"name":"2013 IEEE International Wireless Symposium (IWS)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128951082","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
Millimeter-wave cavity-backed antenna array with high gain and simple structure 具有高增益、结构简单的毫米波腔背天线阵列
2013 IEEE International Wireless Symposium (IWS) Pub Date : 2013-04-14 DOI: 10.1109/IEEE-IWS.2013.6616715
S. Qu
{"title":"Millimeter-wave cavity-backed antenna array with high gain and simple structure","authors":"S. Qu","doi":"10.1109/IEEE-IWS.2013.6616715","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2013.6616715","url":null,"abstract":"Antennas in high speed wireless local-area network (WLAN) at 60 GHz is now becoming a hot topic, and high-gain properties are often preferred due to high transmission loss of the frequencies around 60GHz. In this paper, a 2-element cavity-backed antenna (CBA) array is proposed, which is excited by bowtie dipoles and fed by a transition from a coaxial line to parallel strip lines. The array prototype is fabricated and measured after the parametric optimization is performed. The measured and simulated results agree reasonably with each other, proving that the array can feature an impedance bandwidth of ~8.3% for SWR ≤ 2, a broad gain of 12.6-13.6 dBi, and cross polarization of around -20 dB.","PeriodicalId":344851,"journal":{"name":"2013 IEEE International Wireless Symposium (IWS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128970837","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
Bandwidth extension of GaN Doherty power amplifier: Effect on power, efficiency and linearity GaN Doherty功率放大器的带宽扩展:对功率、效率和线性度的影响
2013 IEEE International Wireless Symposium (IWS) Pub Date : 2013-04-14 DOI: 10.1109/IEEE-IWS.2013.6616789
V. Camarchia, Jie Fang, G. Ghione, A. Javan Khoshkholgh, J. M. Moreno Rubio, M. Pirola, R. Quaglia, C. Ramella
{"title":"Bandwidth extension of GaN Doherty power amplifier: Effect on power, efficiency and linearity","authors":"V. Camarchia, Jie Fang, G. Ghione, A. Javan Khoshkholgh, J. M. Moreno Rubio, M. Pirola, R. Quaglia, C. Ramella","doi":"10.1109/IEEE-IWS.2013.6616789","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2013.6616789","url":null,"abstract":"The paper discusses the bandwidth extension of a second-harmonic tuned GaN Doherty power amplifier: the adopted strategy relies on output wideband compensation stages and input broadband matching. The single-band (3.5 GHz) and the wide-band (3-3.6 GHz) power amplifiers are compared in terms of building blocks design strategy. The performances, experimentally characterized in single- and two-tone conditions, are close to the state-of-the art for these applications, and confirm the validity of the bandwidth extension approach. In fact, output power of more than 43dBm and 6dB back-off efficiency of around 40% are maintained by the bandwidth extension strategy, as well as intermodulation ratio values. Furthermore, digital baseband predistortion is successfully applied to both stages.","PeriodicalId":344851,"journal":{"name":"2013 IEEE International Wireless Symposium (IWS)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125405535","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
Linearization methods of RF CMOS PAs for mobile communications 用于移动通信的RF CMOS PAs的线性化方法
2013 IEEE International Wireless Symposium (IWS) Pub Date : 2013-04-14 DOI: 10.1109/IEEE-IWS.2013.6616822
T. Joo, Bonhoon Koo, K. Son, Songcheol Hong
{"title":"Linearization methods of RF CMOS PAs for mobile communications","authors":"T. Joo, Bonhoon Koo, K. Son, Songcheol Hong","doi":"10.1109/IEEE-IWS.2013.6616822","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2013.6616822","url":null,"abstract":"Although a CMOS device has inferior characteristics for PA it allows versatile controls and possible integrations with other circuits. These advantages surely provide us various methods to linearize a PA with resultant high efficiency. Several linearization methods of RF CMOS PAs are introduced in this paper. These are mostly based on adaptively controlling the biases of common source and common gate power transistors with the input envelope in many different manners. The other type effort is shown for a power driver linearizer which is made of a digital vector modulator. As examples, RF CMOS PAs for WCDMA and WLAN are demonstrated.","PeriodicalId":344851,"journal":{"name":"2013 IEEE International Wireless Symposium (IWS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128756018","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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