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

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Software IQ sample estimation for multi-antenna systems 多天线系统的软件IQ样本估计
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227921
E. Coersmeier, E. Zielinski, K. Wachsmann
{"title":"Software IQ sample estimation for multi-antenna systems","authors":"E. Coersmeier, E. Zielinski, K. Wachsmann","doi":"10.1109/RAWCON.2003.1227921","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227921","url":null,"abstract":"Multi-antenna systems provide the option to enhance the data rates and to improve the overall system performance as long as high transmitter signal accuracy for all signal branches can be guaranteed. At the same time the analog front-end should provide low power consumption and a low cost solution. Hence a direct-conversion transmitter analog front-end architecture for an OFDM multi-antenna system will be proposed including the drawback of possible imperfect analog IQ signals. The expected analog imperfections will be compensated via software-based algorithms. The compensation techniques require IQ sample estimates from the transmitter envelope signal at the antenna input port. This paper provides a mathematical description of the software-based IQ estimation and provides simulation results in conjunction with a filter pre-equalization and quadrature compensation.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"156 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":"132423326","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
RF filters and diplexers for wireless system applications: state of the art and trends 用于无线系统应用的射频滤波器和双工器:最新技术和趋势
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227970
R. Mansour
{"title":"RF filters and diplexers for wireless system applications: state of the art and trends","authors":"R. Mansour","doi":"10.1109/RAWCON.2003.1227970","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227970","url":null,"abstract":"This paper provides an overview of the current and emerging filter technologies for wireless system applications. Detailed comparisons are given for the various filter technologies used in both base-station and mobile handsets applications. Coaxial, dielectric resonator (DR) and high temperature superconductor (HTS) technologies are addressed for base-station applications while ceramic, multiplayer dielectric, surface acoustic wave (SAW) and film bulk acoustic resonator (FBAR) filters are considered for mobile handsets applications. The current development efforts in each filter technology area are also highlighted.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"18 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":"134475623","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
The tuning range improvement of voltage controlled crystal oscillators by using multiple crystals in parallel 多晶并联提高了压控晶体振荡器的调谐范围
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227946
L. Dayaratna
{"title":"The tuning range improvement of voltage controlled crystal oscillators by using multiple crystals in parallel","authors":"L. Dayaratna","doi":"10.1109/RAWCON.2003.1227946","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227946","url":null,"abstract":"This paper presents a wide tuning range voltage controlled crystal oscillator (VCXO) that uses several crystals in parallel. A number of crystals are connected in parallel to increase the tuning range of the oscillator. The parallel crystal combination is shown to be equivalent to a single crystal with a wide tuning range. This arrangement is ideal for applications requiring a larger tuning range. Generalized design equations are derived showing the tuning range relationship to the number of crystals in the circuit. This extended tuning range is demonstrated up to five crystals in parallel. The overall performances of wide tuning range VCXO circuits with multiple crystals are presented.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"113 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":"132483593","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 new miniaturized patch antenna for wireless systems 一种用于无线系统的新型小型化贴片天线
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227941
M. Sahli, T. Denidni, L. Talbi
{"title":"A new miniaturized patch antenna for wireless systems","authors":"M. Sahli, T. Denidni, L. Talbi","doi":"10.1109/RAWCON.2003.1227941","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227941","url":null,"abstract":"This paper presents a design procedure of a new miniaturized patch antenna fed by an L-probe, which can be used for mobile handset applications. To examine the performance of this antenna, a prototype was designed, fabricated and measured at 2 GHz. The bandwidth and far-field radiation patterns of the proposed antenna are discussed theoretically and experimentally. The measured cross-polarization and the front-to-back ratio are also examined.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"83 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":"134317220","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
Optimization of Yagi array by hierarchical genetic algorithms 基于层次遗传算法的八木阵列优化
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227900
H.J. Wang, K. Man, C. Chan, K. M. Luk
{"title":"Optimization of Yagi array by hierarchical genetic algorithms","authors":"H.J. Wang, K. Man, C. Chan, K. M. Luk","doi":"10.1109/RAWCON.2003.1227900","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227900","url":null,"abstract":"A method of hierarchical genetic algorithms (HGA) is used for optimizing the element spacing and lengths of Yagi-Uda antennas. This scheme has the ability of handling multiobjective functions as well as the discrete constraints in the numerical optimizing process. Together with the technique of Pareto ranking scheme, more than one possible solution can be obtained. It has been found that the number of dipoles of the antenna can be minimally identified with multi-facet design criteria as well as the imposed stringent constraints on the antenna design. Furthermore, this added feature also enables a design tradeoff between cost and performance without extra computational effort.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"4 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":"130347033","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: 16
Interference analysis and capacity for mixture of forward link cdma2000-1X and 1xEV-DV voice traffic 前向链路cdma2000-1X和1xEV-DV混合话务的干扰分析和容量
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227883
A. Kavak, J. Cleveland
{"title":"Interference analysis and capacity for mixture of forward link cdma2000-1X and 1xEV-DV voice traffic","authors":"A. Kavak, J. Cleveland","doi":"10.1109/RAWCON.2003.1227883","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227883","url":null,"abstract":"Cdma2000 is a third generation wireless communications technology that provides seamless evolution from voice to high speed data and video through 3Glx, IxEV-DO, and IxEV-DV path. Integrating both voice and data services, IxEV-DV supports packet data rates up to 3 Mbps. However, simultaneous operation of 3Glx and IxEV-DV calls may degrade system capacity significantly as compared to operation of 3Glx calls alone. This paper presents analytical methodology in calculating interference for mixed 3Glx and IxEV-DV calls made in the forward link. Monte Carlo simulations are performed to obtain capacity of the system. Results show that 3Glx system capacity is lowered by 2/3 and 1/3 at 0.1% and at 0.5% outage levels, respectively, when 3Glx and IxEV-DV calls are simultaneously made.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"4 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":"125107763","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
Potential of 0.5 /spl mu/m SOI CMOS process towards low voltage, low power RF applications in multigigahertz regime 0.5 /spl mu/m SOI CMOS工艺在千兆赫频段的低电压、低功率射频应用潜力
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227953
R. Bhatia, S. Jalan, S. Chakraborty, S. Yoon, S. Nuttinck, S. Pinel, D. Nobbe, J. Laskar
{"title":"Potential of 0.5 /spl mu/m SOI CMOS process towards low voltage, low power RF applications in multigigahertz regime","authors":"R. Bhatia, S. Jalan, S. Chakraborty, S. Yoon, S. Nuttinck, S. Pinel, D. Nobbe, J. Laskar","doi":"10.1109/RAWCON.2003.1227953","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227953","url":null,"abstract":"Silicon on insulator (SOI) has emerged as a strong contender for low power RF applications. This paper demonstrates the potential of SOI technology towards the development of next generation RF front ends. The capabilities of a 0.5 /spl mu/m SOI technology are illustrated by the design and fabrication of a low supply voltage, low power VCO operating at 1.8 GHz. The VCO operates with supply voltage as low as 1 V. The tuning range was measured to be 14% and the measured phase noise was -117.5 dBc/Hz at an offset frequency of 1 MHz from the 1.77 GHz carrier. The VCO and the buffers consume 14.7 mW power from a 1.5 V supply. We also demonstrate the development, fabrication and measurement of anti-parallel dioxide pair (APDP) structures towards subharmonic mixers in this technology.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"15 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":"122390048","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
Spread space-spectrum multiple access 扩展空间频谱多址
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227881
B. Ng, E. Sousa
{"title":"Spread space-spectrum multiple access","authors":"B. Ng, E. Sousa","doi":"10.1109/RAWCON.2003.1227881","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227881","url":null,"abstract":"In this paper; a new multiple access scheme suitable for the forward link transmission in a multiuser MIMO system is investigated. Unlike traditional MIMO multiple access schemes, which rely on orthogonal-temporal channels (e.g. TDMA), the proposed scheme, namely the spread space-spectrum multiple access (SSSMA), exploits the space-domain for multiuser multiplexing. As its name suggests, SSSMA utilizes the available degrees of freedom offered by the spread-spectrum and those by the multiple transmit antennas to perform multiple access. At the base-station transmitter, each coded data stream corresponding to a unique user-channel is modulated with a user-specific two-dimensional spreading sequence and added together with other channels' modulated signals. At each user's receiver, the multiple-access-interference (MAI) generated from the same base station is mitigated through iterative multiuser detection and decoding. We focus on the performance of SSSMA in two different environments: (1) local point-to-multipoint network such as central access LAN; and (2) a power-controlled cellular system. It is shown that not only does the SSSMA offer near-theoretic-capacity performance in both environments, it is able to exploit a new form of diversity, namely the space-interferers diversity, in an ideal power-controlled network while other MIMO multiple access schemes fail to do so.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"3 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":"126039465","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 high power, high efficiency UMTS amplifier using a novel Doherty configuration 采用新颖Doherty结构的高功率、高效率UMTS放大器
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227959
'. SimonM.Wood, Raymond, Pengellyl, Masaki Suto
{"title":"A high power, high efficiency UMTS amplifier using a novel Doherty configuration","authors":"'. SimonM.Wood, Raymond, Pengellyl, Masaki Suto","doi":"10.1109/RAWCON.2003.1227959","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227959","url":null,"abstract":"The majority of prior publications on high efficiency amplifiers employing the Doherty configuration have described relatively low peak power circuits. Much of the previously published work has employed Si CMOS, GaAs MESFET or HBT technologies at RF power levels of, at most, a few watts suitable for mobile handset applications. This paper describes a novel Doherty amplifier configuration employing packaged Si LDMOS FETs. The main emphasis has been on providing acceptable gain, flatness, efficiency and linearity over the full UMTS band of 2.11 to 2.17 GHz at single circuit power levels of 90 watts. At 8 dB back-off from P1dB this amplifier configuration has achieved close to 33% drain efficiency under 2 carrier W-CDMA conditions compared to a reference drain efficiency of approximately 20 to 23% under the same ACPR and ACLR conditions for a single, 90 W, discrete transistor amplifier.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"37 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":"130539891","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
Reduced complexity MIMO processing for WLAN (IEEE 802.11b) applications 降低了WLAN (IEEE 802.11b)应用的MIMO处理复杂性
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227920
R. Mostafa, M. Robert, Jeffrey H. Reed
{"title":"Reduced complexity MIMO processing for WLAN (IEEE 802.11b) applications","authors":"R. Mostafa, M. Robert, Jeffrey H. Reed","doi":"10.1109/RAWCON.2003.1227920","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227920","url":null,"abstract":"In this paper, we propose and evaluate a reduced complexity multiple-input-multiple-output (MIMO) system to enhance signal to noise ratio (SNR) and throughput of a WLAN system. The algorithm is based on phase scanning at the transmitter side and maximal ratio combining (MRC) at the receiver side with feedback from the receiver to assist in setting the optimal phase value at the transmitter. This feedback channel is available in the IEEE 802.11b standard, and thus, the proposed algorithm introduces minor modifications to the existing air interface. Simulation results show that the proposed technique increases the throughput sustainability of an 802.11b system.","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":"129882646","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
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