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Radio and Wireless Conference, 2003. RAWCON '03. Proceedings最新文献

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Frequency-dependent space-interleaving for MIMO OFDM systems MIMO OFDM系统的频率相关空间交织
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227897
P. Mohajerani, V.K. Madisetti
{"title":"Frequency-dependent space-interleaving for MIMO OFDM systems","authors":"P. Mohajerani, V.K. Madisetti","doi":"10.1109/RAWCON.2003.1227897","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227897","url":null,"abstract":"We propose the application of optimal space interleaving of symbols, which modulate OFDM subcarriers in the general category of layered MIMO OFDM architectures. This interleaving is frequency-dependent as it differs for each OFDM subcarrier and is time-varying in the sense that the interleaving scheme adapts to channel variations over time. Both optimal and suboptimal methods are developed to this end. Computer simulations show the merit of the proposed methods for different configurations.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125719804","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
Optimization of film bulk acoustic wave resonator (FBAR) for RF filter applications 用于射频滤波器的薄膜体声波谐振器(FBAR)的优化
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227974
Mun-Hyuk Yim, Dong-Hyun Kim, D. Chai, Junpil Jung, Jinseok Park, G. Yoon
{"title":"Optimization of film bulk acoustic wave resonator (FBAR) for RF filter applications","authors":"Mun-Hyuk Yim, Dong-Hyun Kim, D. Chai, Junpil Jung, Jinseok Park, G. Yoon","doi":"10.1109/RAWCON.2003.1227974","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227974","url":null,"abstract":"In this paper, we present the effects of the thermal annealing of the W/SiO/sub 2/ multi-layer Bragg reflectors on the resonance characteristics of the ZnO-based film bulk acoustic resonator (FBAR) devices and the use of the cobalt (Co) electrodes instead of the aluminum (Al) electrodes to optimize the FBAR for RF filter applications. The resonance characteristics could be significantly improved by the thermal annealing and using the Co as the electrodes in FBAR devices. The FBAR devices with the Bragg reflectors annealed at 400/spl deg/C/30 min show excellent resonance characteristics in term of the return loss and Q-factor.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134468867","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
Transmitter cost/efficiency exploration for 5-GHz WLAN 5-GHz无线局域网发射机成本/效率探索
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227886
J. Van Driessche, G. Cantone, W. Eberle, B. Come, S. Donnay
{"title":"Transmitter cost/efficiency exploration for 5-GHz WLAN","authors":"J. Van Driessche, G. Cantone, W. Eberle, B. Come, S. Donnay","doi":"10.1109/RAWCON.2003.1227886","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227886","url":null,"abstract":"Wireless LAN systems target wireless communications for demanding multimedia applications in several types of environments. While meeting many transmitter and receiver specifications, designing a low-cost, efficient and portable system covering this whole design space becomes infeasible. Therefore we developed a methodology that translates this multitude of requirements into a system covering a part of the design space, but still attractive from an application point of view and with an optimal performance/cost-ratio. As a result, we show that there is only a limited set of applications that can be covered by a 5-GHz wireless LAN mobile terminal with 16 dBm average output power. Instead a mobile terminal with 23 dBm average output power can work in more scenarios. Further we show that implementing a more efficient power amplifier architecture has limited impact on the system efficiency in the 16-dBm system-on-chip (SoC) case, however this becomes crucial for integration of a 23-dBm mobile terminal using a system-in-a-package (SiP) approach.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"08 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127304663","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
Wideband direction-of-arrival estimation and beamforming for smart antennas system 智能天线系统的宽带到达方向估计和波束形成
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227909
T. Do-Hong, P. Russer
{"title":"Wideband direction-of-arrival estimation and beamforming for smart antennas system","authors":"T. Do-Hong, P. Russer","doi":"10.1109/RAWCON.2003.1227909","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227909","url":null,"abstract":"This paper summarizes the smart antennas approaches and presents the methods for wideband direction-of-arrival (DOA) estimation and wideband beamforming. For wideband DOA estimation, we focus on spectral-based methods using arbitrary antenna array. For wideband beamforming, time-domain processing and frequency-domain processing methods, which produce frequency-invariant beam response over wide signal bandwidth, are introduced. The method for design of wideband beamforming using spatial interpolation, which can reduce number of array elements and prescribe beampatterns, will be also presented.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123016403","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
Automatic calibration of a direct upconversion transmitter 直接上转换发射机的自动校准
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227939
J. Craninckx, S. Donnay
{"title":"Automatic calibration of a direct upconversion transmitter","authors":"J. Craninckx, S. Donnay","doi":"10.1109/RAWCON.2003.1227939","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227939","url":null,"abstract":"This paper presents a novel method to measure and compensate the analog imperfections in a direct upconversion transmitter. The RF output spectrum is downconverted back to baseband frequencies by re-using the transmit mixer. Errors in the up- and downconversion process are now correlated, and the required measurements and mathematics are presented to extract estimates for the errors that cause imperfect image rejection and carrier feedthrough.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124302694","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 common power-stage cellular/PCS/W-CDMA triple-band MMIC power amplifier 一种常用的功率级蜂窝/PCS/W-CDMA三频段MMIC功率放大器
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227948
K. Kim, J. H. Kim, Y. Noh, C. Park
{"title":"A common power-stage cellular/PCS/W-CDMA triple-band MMIC power amplifier","authors":"K. Kim, J. H. Kim, Y. Noh, C. Park","doi":"10.1109/RAWCON.2003.1227948","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227948","url":null,"abstract":"This paper describes the design and experimental results of an InGaP/GaAs hetero-junction bipolar transistor (HBT) monolithic microwave integrated circuit (MMIC) power amplifier for cellular (850 MHz)/PCS(1750 MHz)/W-CDMA (1950 MHz) triple-band mobile terminal applications. This two-stage power amplifier has only one power-stage in common for the triple bands to achieve a small chip and module size for low manufacturing cost. In order to reduce quiescent current for cellular band, the band selecting circuit to control bias current is used to the power-stage amplifier. This power amplifier has the power gain of 30 dB (26 dB, 25 dB) for cellular (PCS, W-CDMA) band and power-added efficiency (PAE) of 43% at the output of 28 dBm for cellular band under 3.4 V operation voltage.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122665952","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
Receiver-based packet combining in IEEE 802.11a wireless LAN IEEE 802.11a无线局域网中基于接收器的分组合并
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227889
M. Gidlund
{"title":"Receiver-based packet combining in IEEE 802.11a wireless LAN","authors":"M. Gidlund","doi":"10.1109/RAWCON.2003.1227889","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227889","url":null,"abstract":"In this paper, we evaluate the performance of employing packet combining in 802.1 la wireless LAN (WLAN). Packet combining is well suited for wireless LANs since it provides a diversity gain to the system that can reduce the interference problem and enhance the system performance. Performance results show that a receiver employing packet combining provides significant gains in throughput and reductions in packet error probability when compared to with a receiver that does not employ combining. It is also found that for large packet sizes the gain is greater than for smaller packet sizes, because errors are more likely to occur in the header than in the data.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125702905","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
A method to enhance the bandwidth of microstrip antennas using a modified E-shaped patch 一种利用改进的e型贴片增强微带天线带宽的方法
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227942
A. Yu, Xuexia Zhang
{"title":"A method to enhance the bandwidth of microstrip antennas using a modified E-shaped patch","authors":"A. Yu, Xuexia Zhang","doi":"10.1109/RAWCON.2003.1227942","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227942","url":null,"abstract":"In this paper, a patch antenna with a slot and a tuning stub, or called a modified E-shaped patch (MESP), has been studied. Simulation has shown that the tuning stub has introduced a new resonant frequency, resulting in a bandwidth of 380 MHz, or 6.8% relative to the central frequency of 5.58 GHz. The experimental result shows 400 MHz, or 7.2%. While the bandwidth of a common rectangular patch of the same size on the same substrate, which is 220 MHz, or 3.96%, by simulation, and 254 MHz, or 4.6% by experiment.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116580838","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: 45
AM-AM and AM-PM measurement of baseband to RF integrated circuits for ACPR calculations AM-AM和AM-PM测量基带到射频集成电路的ACPR计算
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227945
K. Gard, L. Larson, M. Steer
{"title":"AM-AM and AM-PM measurement of baseband to RF integrated circuits for ACPR calculations","authors":"K. Gard, L. Larson, M. Steer","doi":"10.1109/RAWCON.2003.1227945","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227945","url":null,"abstract":"A method to measure AM-AM and AM-PM characteristics of integrated circuits that operate with baseband inputs and RF outputs is presented. The technique requires control of the baseband input signal, three signal generators, and a vector voltage meter to make the measurement. ACPR calculated from the nonlinear transfer characteristic of two CDMA transmitter RFICs are compared with measured ACPR performance.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134167531","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 design of printed square loop antenna for omni-directional radiation patterns 面向全向辐射方向图的印刷方形环形天线设计
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227940
Hyeonjin Lee, Hun Nam, Yeongseog Lim
{"title":"A design of printed square loop antenna for omni-directional radiation patterns","authors":"Hyeonjin Lee, Hun Nam, Yeongseog Lim","doi":"10.1109/RAWCON.2003.1227940","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227940","url":null,"abstract":"In this paper, for dual band operation of both PCS and IMT2000, we propose a wideband antenna with printed square loop configuration. The proposed antenna has the CPW-feed structure on the same plane with radiating element. The calculated and measured bandwidths for 15 dB return loss are 1 GHz (1.68/spl sim/2.68 GHz) and 1.14 GHz (1.46/spl sim/2.6 GHz), respectively. The fabricated antenna has nearly omni-directional radiation pattern, and measured antenna gain of 2.67 dBi. These results confirm that proposed antenna could be used in both PCS and IMT2000 band operation.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134097507","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: 14
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