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2003 IEEE Topical Conference on Wireless Communication Technology最新文献

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A dual-band image-reject mixer for GPS with 64 dB image rejection 具有64 dB图像抑制的GPS双频图像抑制混频器
2003 IEEE Topical Conference on Wireless Communication Technology Pub Date : 2003-10-15 DOI: 10.1109/WCT.2003.1321472
M. Haruoka, Y. Utsurogi, T. Matsuoka, K. Taniguchi
{"title":"A dual-band image-reject mixer for GPS with 64 dB image rejection","authors":"M. Haruoka, Y. Utsurogi, T. Matsuoka, K. Taniguchi","doi":"10.1109/WCT.2003.1321472","DOIUrl":"https://doi.org/10.1109/WCT.2003.1321472","url":null,"abstract":"The dual-band image-reject mixer is designed for a GPS L1/L2 dual-band receiver, an extension of the conventional weaver architecture (Wu, S. and Razavi B., ISSCC Digest, p.124-5, 1998). The paper presents a quadrature mixer with phase error compensation capability in the quadrature LO signal -without calibration - and tuning. The measurement of the dual-band image-rejection mixer demonstrated 64 dB image rejection ratio (IMRR).","PeriodicalId":6305,"journal":{"name":"2003 IEEE Topical Conference on Wireless Communication Technology","volume":"113 1","pages":"168-169"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79248242","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
Measurements and simulations of compact MIMO-systems based on polarization diversity 基于极化分集的小型mimo系统的测量与仿真
2003 IEEE Topical Conference on Wireless Communication Technology Pub Date : 2003-10-15 DOI: 10.1109/WCT.2003.1321526
Christian Waldschmidt, C. Kuhnert, T. Fugen, Werner Wiesbeck
{"title":"Measurements and simulations of compact MIMO-systems based on polarization diversity","authors":"Christian Waldschmidt, C. Kuhnert, T. Fugen, Werner Wiesbeck","doi":"10.1109/WCT.2003.1321526","DOIUrl":"https://doi.org/10.1109/WCT.2003.1321526","url":null,"abstract":"A comparison of different very compact antenna arrays for MIMO systems is presented. It is shown that a combination of different diversity techniques, like spatial, pattern and polarization diversity, leads to compact capable MIMO systems. First, simulations showing the fundamentals of polarization diversity in MIMO systems are given. Second, channel measurements with different antenna array configurations are shown.","PeriodicalId":6305,"journal":{"name":"2003 IEEE Topical Conference on Wireless Communication Technology","volume":"95 1","pages":"284-285"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85512552","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: 13
Advanced and intelligent RF front end technology 先进智能的射频前端技术
2003 IEEE Topical Conference on Wireless Communication Technology Pub Date : 2003-10-15 DOI: 10.1109/WCT.2003.1321485
K. Leong, T. Itoh
{"title":"Advanced and intelligent RF front end technology","authors":"K. Leong, T. Itoh","doi":"10.1109/WCT.2003.1321485","DOIUrl":"https://doi.org/10.1109/WCT.2003.1321485","url":null,"abstract":"This paper discusses the recent developments by the author's group in the field of RF front-end technology. This includes standalone RF front-end components such as a self-heterodyne mixer as well as more functional front-end circuitry such as digital and analog beamformers.","PeriodicalId":6305,"journal":{"name":"2003 IEEE Topical Conference on Wireless Communication Technology","volume":"88 1","pages":"190-193"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88357551","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
Improved on-off algorithm for adaptive antenna arrays in CDMA mobile communication systems CDMA移动通信系统中自适应天线阵列的改进开关算法
2003 IEEE Topical Conference on Wireless Communication Technology Pub Date : 2003-10-15 DOI: 10.1109/WCT.2003.1321580
K. Ghanem, T. Denidni
{"title":"Improved on-off algorithm for adaptive antenna arrays in CDMA mobile communication systems","authors":"K. Ghanem, T. Denidni","doi":"10.1109/WCT.2003.1321580","DOIUrl":"https://doi.org/10.1109/WCT.2003.1321580","url":null,"abstract":"The conventional generalized on-off algorithm (Choi et al. (2002)) requires many bit durations to converge. In order to reduce the processing time, a new algorithm, called the variable on-off (VOO), is proposed. This algorithm carries out the updating for chip duration instead of the bit duration, and performs the adaptation for the different paths at the same time. The latter operation allows us to reduce the processing time by L, where L is the number of paths. When the channel is subject to rapid variations or under high mobility, the angles of arrival change significantly over some symbol intervals. To overcome these problems, the variable step size of the VOO algorithm, which follows power gradient variation, allows the tracking of such an adverse environment, while simultaneously tracking the maximum power.","PeriodicalId":6305,"journal":{"name":"2003 IEEE Topical Conference on Wireless Communication Technology","volume":"11 1","pages":"406-407"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75594341","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
Theoretical prediction of radio channel statistics 无线电信道统计的理论预测
2003 IEEE Topical Conference on Wireless Communication Technology Pub Date : 2003-10-15 DOI: 10.1109/WCT.2003.1321480
H. Bertoni
{"title":"Theoretical prediction of radio channel statistics","authors":"H. Bertoni","doi":"10.1109/WCT.2003.1321480","DOIUrl":"https://doi.org/10.1109/WCT.2003.1321480","url":null,"abstract":"Because communication systems operate at many locations over a wide range of building environments, the description of the parameters are necessarily statistical in nature. This view of the channel is complementary with the ray description of propagation, which is appropriate at frequencies in the UHF band and above. The results obtained from ray tracing need only be processed to achieve the manifestation appropriate to the communication system. Statistical variations of the channel parameters may be obtained from Monte Carlo simulations for ray results at many receiver locations.","PeriodicalId":6305,"journal":{"name":"2003 IEEE Topical Conference on Wireless Communication Technology","volume":"33 1","pages":"183-184"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75425090","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
Block-Toeplitz fast integral equation solver for large finite periodic and partially periodic antenna arrays 大型有限周期和部分周期天线阵列的Block-Toeplitz快速积分方程求解器
2003 IEEE Topical Conference on Wireless Communication Technology Pub Date : 2003-10-15 DOI: 10.1109/WCT.2003.1321590
E. Bleszynski, M. Bleszynski, T. Jaroszewicz
{"title":"Block-Toeplitz fast integral equation solver for large finite periodic and partially periodic antenna arrays","authors":"E. Bleszynski, M. Bleszynski, T. Jaroszewicz","doi":"10.1109/WCT.2003.1321590","DOIUrl":"https://doi.org/10.1109/WCT.2003.1321590","url":null,"abstract":"We propose a fast integral equation solver for large periodic and non-periodic finite antenna array systems. A key element of the algorithm is the rigorous block-Toeplitz method with an FFT-based matrix-vector product accelerator, which can be used in conjunction with either the conventional MoM, or with the AIM (adaptive integral method) or FMM (fast multipole method) compression techniques. We refer to the resulting algorithms as the Toeplitz-MoM, Toeplitz-AIM, or Toeplitz-FMM matrix compressions. For a periodic distribution of array elements, the algorithm exploits the block-Toeplitz structure of the impedance matrix in three dimensions and allows the implementation of matrix-vector multiplication in terms of discrete fast Fourier transforms (FFTs) in spatial variables associated with distances between the array elements. This approach generalizes to antenna arrays with boundaries, arrays located on substrates, and similar not entirely periodic systems.","PeriodicalId":6305,"journal":{"name":"2003 IEEE Topical Conference on Wireless Communication Technology","volume":"81 1","pages":"428-429"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91389916","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
A novel GSM/DCS dual-band cellular communications antenna 一种新型GSM/DCS双频蜂窝通信天线
2003 IEEE Topical Conference on Wireless Communication Technology Pub Date : 2003-10-15 DOI: 10.1109/WCT.2003.1321428
T. Liu, Wen Zhang
{"title":"A novel GSM/DCS dual-band cellular communications antenna","authors":"T. Liu, Wen Zhang","doi":"10.1109/WCT.2003.1321428","DOIUrl":"https://doi.org/10.1109/WCT.2003.1321428","url":null,"abstract":"A novel dual-band single layer patch antenna is presented; it covers the bands of 890-960 MHz for GSM and 1710-1880 MHz for DCS, with VSWR/spl les/2. This antenna consists of a ground plane, air layer, and a metal patch layer printed on a thin substrate with lower permittivity. The performance is simulated with Ansoft Ensemble 8.0 software. The bandwidth is 83 MHz for GSM band (9.22 %) and 730 MHz for DCS band (40.56 %). The results of simulation and experiment are compared and found to be in good agreement. The antenna has the merits of low profile, light weight and low cost. It has potential application in cellular mobile communications.","PeriodicalId":6305,"journal":{"name":"2003 IEEE Topical Conference on Wireless Communication Technology","volume":"30 1","pages":"27-28"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91383230","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
Incorporation of RF-adaptive array antenna into MIMO receivers 射频自适应阵列天线在MIMO接收机中的集成
2003 IEEE Topical Conference on Wireless Communication Technology Pub Date : 2003-10-15 DOI: 10.1109/WCT.2003.1321530
Y. Nakaya, T. Toda, S. Hara, J. Takada, Y. Oishi
{"title":"Incorporation of RF-adaptive array antenna into MIMO receivers","authors":"Y. Nakaya, T. Toda, S. Hara, J. Takada, Y. Oishi","doi":"10.1109/WCT.2003.1321530","DOIUrl":"https://doi.org/10.1109/WCT.2003.1321530","url":null,"abstract":"We propose the incorporation of an RF-adaptive array antenna (RF-AAA) into each receive branch on multiple-input multiple output (MIMO) systems. The RF-AAA consists of multiple antenna elements where a variable-gained low-noise amplifier (VG-LNA) and a 360/spl deg/- continuously adjustable phase shifter are inserted in each antenna element and an adder for the array output is connected into the RF front-end of each receive branch. The phase shifters are adaptively controlled to increase the total channel capacity of MIMO systems. Computer simulations showed that the capacity of a 2-element-receive-RF-AAA incorporated 2 /spl times/ 2 MIMO system is higher than that of a conventional 3 /spl times/ 3 MIMO system (without RF-AAA) under average transmit power constraints.","PeriodicalId":6305,"journal":{"name":"2003 IEEE Topical Conference on Wireless Communication Technology","volume":"35 1","pages":"297-298"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78385919","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
Bandwidth-efficient modulation for wireless communications 无线通信的带宽高效调制
2003 IEEE Topical Conference on Wireless Communication Technology Pub Date : 2003-10-15 DOI: 10.1109/WCT.2003.1321449
D. Wenzel, J. Poklemba
{"title":"Bandwidth-efficient modulation for wireless communications","authors":"D. Wenzel, J. Poklemba","doi":"10.1109/WCT.2003.1321449","DOIUrl":"https://doi.org/10.1109/WCT.2003.1321449","url":null,"abstract":"As wireless technologies have evolved, the available radiofrequency spectrum has become an important commodity. The current crowding of the spectrum leads to the investigation of more efficient uses of allocated bandwidth. Quadrature-vestigial-sideband (QVSB) is a bandwidth-efficient modulation scheme that doubles the data capacity of conventional VSB. By superimposing two VSB-modulated, independent data streams, QVSB can achieve data rates equivalent to conventional, Nyquist-filtered, double-sideband (DSB) schemes, using half the bandwidth. Efficient, high-rate, turbo-product-codes (TPCs) are used in conjunction with QVSB modulation, to achieve a system which is both power and bandwidth efficient. In particular, capacity performance is about 4 to 5.5 dB from the Shannon bound, up to approximately 5 bits/s/Hz, the highest capacity simulated thus far.","PeriodicalId":6305,"journal":{"name":"2003 IEEE Topical Conference on Wireless Communication Technology","volume":"127 6 1","pages":"113-116"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87761029","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
Signal reconstruction by path integral methods 用路径积分法重建信号
2003 IEEE Topical Conference on Wireless Communication Technology Pub Date : 2003-10-15 DOI: 10.1109/WCT.2003.1321502
R. Nevels, J. Jeong
{"title":"Signal reconstruction by path integral methods","authors":"R. Nevels, J. Jeong","doi":"10.1109/WCT.2003.1321502","DOIUrl":"https://doi.org/10.1109/WCT.2003.1321502","url":null,"abstract":"As a signal travels through a waveguide or through the atmosphere, natural conditions such as inhomogeneity and dissipation can cause alterations in the signal quality. While generally we determine the received signal given the initial waveform along with its distribution in space and the conditions between the source and received points, here we attempt to solve the inverse problem. That is, given the received signal at a point in space, reconstruct the source signal. Naturally this can be accomplished by a number of methods given the field distribution over a cross section of a region in space, but here we only wish to consider the possibility of being provided with the material conditions of the space between the source and receiver and the actual signal received at a point in space. A scheme for restoring such distorted waves has been presented by Foong (1959), based on a generalized Kac method (1959). Our approach is similar in that it relies upon a Feyman path integral formulation, but in a form quite different from that of Kac.","PeriodicalId":6305,"journal":{"name":"2003 IEEE Topical Conference on Wireless Communication Technology","volume":"4 1","pages":"227-228"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83118739","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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