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Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573)最新文献

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Prediction of mutual coupling between base station antenna arrays 基站天线阵列间互耦预测
Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573) Pub Date : 2002-11-07 DOI: 10.1109/RAWCON.2002.1030140
A. Mohammadian, L. Golovanevsky, S. Soliman, M. A. Tassoudji
{"title":"Prediction of mutual coupling between base station antenna arrays","authors":"A. Mohammadian, L. Golovanevsky, S. Soliman, M. A. Tassoudji","doi":"10.1109/RAWCON.2002.1030140","DOIUrl":"https://doi.org/10.1109/RAWCON.2002.1030140","url":null,"abstract":"A simple approach is developed to compute mutual coupling (or isolation) between base-station antenna arrays of N dipoles. This approach utilizes a closed form expression for the self and mutual impedances for two slanted dipoles in free space. Two arrays of these dipoles are then assembled together. The elements of the 2N /spl times/ 2N Z matrix of the resulting system are the self impedance of individual dipoles as well as the mutual impedance between every two dipoles within each array and between the two arrays. The input impedance of each array and the mutual impedance between them may be easily derived by combining this Z matrix and the S matrices of two corporate feeds made of two-way power dividers. Alternatively, using a circuit theory approach and working with the Y matrix of the array, the individual antenna elements in each array may be connected together in parallel. This will reduce the 2N-port system into a two-port system whose input and mutual impedances can be easily calculated. The above approach cannot directly include the effect of a finite ground plane that usually utilized in the base-station arrays to provide higher gains and a one-sided beam. However, it was found that the mutual coupling between two arrays without a ground plane could be corrected to provide a reasonable estimate for the coupling between two arrays with a finite ground plane. The correction suggested here is based on the far field coupling predicted by the Friis transmission formula. The mutual coupling between the two arrays predicted by this method agrees reasonably well with the measured results for arrays in both broadside and colinear configurations.","PeriodicalId":132092,"journal":{"name":"Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573)","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115428891","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
Adaptive power amplifier linearization by digital pre-distortion using genetic algorithms 基于遗传算法的数字预失真自适应功率放大器线性化
Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573) Pub Date : 2002-11-07 DOI: 10.1109/RAWCON.2002.1030159
J. Sills, R. Sperlich
{"title":"Adaptive power amplifier linearization by digital pre-distortion using genetic algorithms","authors":"J. Sills, R. Sperlich","doi":"10.1109/RAWCON.2002.1030159","DOIUrl":"https://doi.org/10.1109/RAWCON.2002.1030159","url":null,"abstract":"This paper investigates the application of genetic algorithms to PA linearization using digital pre-distortion with narrowband feedback. An algorithm is presented that adapts a polynomial pre-distortion function to minimize adjacent channel emissions. The paper describes the implementation of this algorithm and compares its performance with a random search technique. Results show nearly optimal performance in a limited number of iterations, suggesting that this technique can be employed as a low-cost solution to meet adjacent channel leakage ratio (ACLR) requirements.","PeriodicalId":132092,"journal":{"name":"Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115505847","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: 21
Improved design technique of a microwave class-E power amplifier with finite switching-on resistance 有限导通电阻微波e类功率放大器的改进设计技术
Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573) Pub Date : 2002-11-07 DOI: 10.1109/RAWCON.2002.1030162
Chengzhou Wang, Lawrence E. Larson, Peter M. Asbeck
{"title":"Improved design technique of a microwave class-E power amplifier with finite switching-on resistance","authors":"Chengzhou Wang, Lawrence E. Larson, Peter M. Asbeck","doi":"10.1109/RAWCON.2002.1030162","DOIUrl":"https://doi.org/10.1109/RAWCON.2002.1030162","url":null,"abstract":"The class-E amplifier is a highly efficient amplifier for microwave power applications. Due to the complexity involved, previous analytical efforts assumed either zero switch resistance and/or infinite drain (collector) inductance, which resulted in less than optimum designs. In this paper, we take the effect of both the finite switching-on resistance and finite drain inductance into account, and present an improved and optimized design technique. A 1.9 GHz CMOS class-E power amplifier, which can deliver 0.25 W of output power, was analyzed as an example of this new design technique. Excellent agreement between the theoretical analysis and simulation results is reported, pointing the way towards the optimized design of the class-E stage for microwave applications.","PeriodicalId":132092,"journal":{"name":"Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127125638","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: 32
Half frequency instability on a 1W bipolar part 1W双极部分的半频不稳定性
Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573) Pub Date : 2002-11-07 DOI: 10.1109/RAWCON.2002.1030144
A. Aimdilokwong, R. Weber
{"title":"Half frequency instability on a 1W bipolar part","authors":"A. Aimdilokwong, R. Weber","doi":"10.1109/RAWCON.2002.1030144","DOIUrl":"https://doi.org/10.1109/RAWCON.2002.1030144","url":null,"abstract":"Half frequency instability is investigated on a 1W bipolar part. The small signal scattering parameters are measured at 500 MHz while the bipolar part is operating at 1 GHz. The measurement is done over various drive levels ranging from linear to saturation regions of operation. An algorithm is used to calculate the small signal S-parameters at 500 MHz without having to present 50-ohm termination to the device but instead the optimum load at 1 GHz. This is significant because the microwave power transistor needs a suitable load termination (not a 50-ohm termination) in order to operate at that large signal level.","PeriodicalId":132092,"journal":{"name":"Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573)","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126755536","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 pre-equalization in analog heterodyne architectures for wireless LAN 无线局域网模拟外差架构中的自适应预均衡
Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573) Pub Date : 2002-11-07 DOI: 10.1109/RAWCON.2002.1030129
E. Coersmeier, E. Zielinski
{"title":"Adaptive pre-equalization in analog heterodyne architectures for wireless LAN","authors":"E. Coersmeier, E. Zielinski","doi":"10.1109/RAWCON.2002.1030129","DOIUrl":"https://doi.org/10.1109/RAWCON.2002.1030129","url":null,"abstract":"The IEEE802.11a wireless LAN standard defines a high system performance and therefore requires a certain signal accuracy for the OFDM transmitter output. Taking the potential analog low, medium IF and RF filter imperfections into account, it is necessary to pre-equalize the signal stream digitally before transmitting. The paper concentrates on the description of the OFDM transmitter front-end architecture and the adaptive decision-aided pre-equalization in the digital domain. The mathematics of the pre-equalization process are derived from the well known post-equalization respective channel-equalization case. Finally simulation results are presented.","PeriodicalId":132092,"journal":{"name":"Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129851400","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
Millimeter-wave self-heterodyne transmission technique and a simple millimeter-wave diversity-reception system 毫米波自外差传输技术和简单的毫米波分集接收系统
Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573) Pub Date : 2002-11-07 DOI: 10.1109/RAWCON.2002.1030131
Y. Shoji, K. Hamaguchi, H. Ogawa
{"title":"Millimeter-wave self-heterodyne transmission technique and a simple millimeter-wave diversity-reception system","authors":"Y. Shoji, K. Hamaguchi, H. Ogawa","doi":"10.1109/RAWCON.2002.1030131","DOIUrl":"https://doi.org/10.1109/RAWCON.2002.1030131","url":null,"abstract":"We introduce a millimeter-wave self-heterodyne transmission technique and a simple system that provides diversity in reception. Millimeter-wave oscillators with higher levels of phase-noise and frequency offset are relatively cheap; the technique allows the use of such oscillators in millimeter-wave communications systems regardless of the modulation format because the effects of the oscillator are canceled at the receiver. Applying this technique thus provides extremely stable and low-phase-noise transmission as well as a lower-cost millimeter-wave communications system. We also show that the use of millimeter-wave self-heterodyning is applicable to the cost-effective creation of easy-to-handle combining-diversity reception systems and that an extra-CNR margin of 3 dB can be obtained by the two-branch structure for diversity in reception.","PeriodicalId":132092,"journal":{"name":"Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129933321","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
Modeling and comparison of different micromachined three-dimensional inductors 不同微机械三维电感器的建模与比较
Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573) Pub Date : 2002-11-07 DOI: 10.1109/RAWCON.2002.1030171
Shang-Yu Liang, Shu-Hui Tsai, Chun‐hsien Lee, Ruey-Shing S. Huang
{"title":"Modeling and comparison of different micromachined three-dimensional inductors","authors":"Shang-Yu Liang, Shu-Hui Tsai, Chun‐hsien Lee, Ruey-Shing S. Huang","doi":"10.1109/RAWCON.2002.1030171","DOIUrl":"https://doi.org/10.1109/RAWCON.2002.1030171","url":null,"abstract":"3D inductors have been reported using micromachining technology. However, almost all studies focused on the solenoid type inductors. We present a complete way to analyze different 3D inductors. After decomposing the inductor into several current elements, the mutual inductances within them are presented. Although the solenoid type inductor usually has positive mutual inductances, the toroidal-meander type inductor still has a larger density of inductance in some conditions, especially with a thin intermediate layer. Besides, the latter shows better uniformity of current density, less resistance per unit length and higher quality factor.","PeriodicalId":132092,"journal":{"name":"Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573)","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129023878","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
Design and implementation of a switched-beam smart antenna for an 802.11b wireless access point 用于802.11b无线接入点的开关波束智能天线的设计和实现
Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573) Pub Date : 2002-11-07 DOI: 10.1109/RAWCON.2002.1030116
F. Cladwell, J. Kenney, I.A. Ingram
{"title":"Design and implementation of a switched-beam smart antenna for an 802.11b wireless access point","authors":"F. Cladwell, J. Kenney, I.A. Ingram","doi":"10.1109/RAWCON.2002.1030116","DOIUrl":"https://doi.org/10.1109/RAWCON.2002.1030116","url":null,"abstract":"This paper focuses on the design and implementation of beam forming network components for use at 2.4 GHz. The beam forming network (BFN) is designed to utilize a dual metric beam-selection algorithm. The first metric uses analog power detection and is incorporated in the switch matrix. A digital metric is performed off-board to update the switch states when necessary. The design and measured results of the 8-way Butler matrix and switch matrix are presented. The array factor is simulated to establish the radiation pattern of the BFN. Theoretical calculations of SNR improvement are modified to include the loss of the network for overall system performance.","PeriodicalId":132092,"journal":{"name":"Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116506559","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: 21
On the performance comparison of different UWB data modulation schemes in AWGN channel in the presence of jamming 对AWGN信道中存在干扰时不同UWB数据调制方案的性能进行了比较
Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573) Pub Date : 2002-11-07 DOI: 10.1109/RAWCON.2002.1030123
M. Hamalainen, R. Tesi, J. Iinatti, V. Hovinen
{"title":"On the performance comparison of different UWB data modulation schemes in AWGN channel in the presence of jamming","authors":"M. Hamalainen, R. Tesi, J. Iinatti, V. Hovinen","doi":"10.1109/RAWCON.2002.1030123","DOIUrl":"https://doi.org/10.1109/RAWCON.2002.1030123","url":null,"abstract":"This paper studies the performance of ultra wideband (UWB) communication systems in AWGN channels. The studied UWB systems are utilizing different kinds of modulation schemes. The propagating information signal is jammed with a signal having a spectrum in the UMTS or in the GSM band. The simulations showed that the time hopping UWB system utilizing binary PAM modulation outperforms the other studied modulation schemes in the AWGN channel when a jamming signal is present. The simulation results showed that the rank order of the studied modulation schemes in the AWGN channel in the presence of jamming is time-hopping binary pulse amplitude modulation. direct sequence based binary pulse amplitude modulation, time hopping pulse position modulation and direct sequence based on-off-keying.","PeriodicalId":132092,"journal":{"name":"Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573)","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126563128","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: 31
A cmos rf bandpass low noise amplifier for multi-band wireless communication applications 用于多波段无线通信应用的cmos射频带通低噪声放大器
Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573) Pub Date : 2002-11-07 DOI: 10.1109/RAWCON.2002.1030158
Shouxian Mou, Jianguo Ma, K. Yeo, M. Do
{"title":"A cmos rf bandpass low noise amplifier for multi-band wireless communication applications","authors":"Shouxian Mou, Jianguo Ma, K. Yeo, M. Do","doi":"10.1109/RAWCON.2002.1030158","DOIUrl":"https://doi.org/10.1109/RAWCON.2002.1030158","url":null,"abstract":"A new multi-band bandpass low noise amplifier was designed based on Charted Semiconductor Manufacturing (CSMj 0.25 m CMOS technology. The LN.4 is capable of a simultaneous operation at three different frequency bands: 900MHz-980MHz, 1.8GHz2.5GHz and SGHZ-~GHZ, with the corresponding peak gains to each band of 28.2dB, 25dB and 23.7dB respectively. The operating frequency range of this LNA covers almost all of the working bands of modem popular mobile/wireless communications, such as GSM900/1800, PCSIPHS, DECT, IMT-2000, the thirdgeneration (3Gj mobile communication, the Bluetooth, HiperLAN and some other bands indicated in IEEE 802.11a and 802.llb&n1dards. The LNA also has the noise figure of no more than 5dE3 and the power consumption of 43mW at a low voltage supply of 1.5V. This design brings great convenience for modem multistandard mobile/wireless . communications and the","PeriodicalId":132092,"journal":{"name":"Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573)","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121859245","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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