Pub Date : 2003-10-15DOI: 10.1109/WCT.2003.1321472
M. Haruoka, Y. Utsurogi, T. Matsuoka, K. Taniguchi
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).
{"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}
Pub Date : 2003-10-15DOI: 10.1109/WCT.2003.1321526
Christian Waldschmidt, C. Kuhnert, T. Fugen, Werner Wiesbeck
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.
{"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}
Pub Date : 2003-10-15DOI: 10.1109/WCT.2003.1321485
K. Leong, T. Itoh
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.
{"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}
Pub Date : 2003-10-15DOI: 10.1109/WCT.2003.1321580
K. Ghanem, T. Denidni
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.
传统的广义开关算法(Choi et al.(2002))需要许多位持续时间才能收敛。为了缩短处理时间，提出了一种新的算法——可变开-关算法。该算法对芯片持续时间进行更新，而不是对比特持续时间进行更新，同时对不同的路径进行自适应。后一种操作允许我们将处理时间减少L，其中L是路径的数量。当信道受到快速变化或高流动性的影响时，到达角在某些符号间隔内发生显著变化。为了克服这些问题，遵循功率梯度变化的VOO算法的可变步长允许在跟踪最大功率的同时跟踪这种不利环境。
{"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}
Pub Date : 2003-10-15DOI: 10.1109/WCT.2003.1321480
H. Bertoni
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.
{"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}
Pub Date : 2003-10-15DOI: 10.1109/WCT.2003.1321590
E. Bleszynski, M. Bleszynski, T. Jaroszewicz
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.
{"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}
Pub Date : 2003-10-15DOI: 10.1109/WCT.2003.1321428
T. Liu, Wen Zhang
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.
{"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}
Pub Date : 2003-10-15DOI: 10.1109/WCT.2003.1321530
Y. Nakaya, T. Toda, S. Hara, J. Takada, Y. Oishi
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.
{"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}
Pub Date : 2003-10-15DOI: 10.1109/WCT.2003.1321449
D. Wenzel, J. Poklemba
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.
{"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}
Pub Date : 2003-10-15DOI: 10.1109/WCT.2003.1321502
R. Nevels, J. Jeong
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.
{"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}
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