Pub Date : 2003-10-15DOI: 10.1109/WCT.2003.1321498
A. Miura, M. Tanaka
While mesh material is often used for the reflecting surface of satellite antennas because it is lightweight and elastic due to its stitched structure, little research and development have been done for the mesh reflecting surface used for the satellite antenna using the frequency such as the Ka-band. A large deployable antenna with 7-m diameter, which provides communications service in the Ka-band, was proposed by the Communications Research Laboratory of Japan, in the framework 'of the research on the Japanese Highly Elliptic Orbital satellite system called the Quasi-Zenith Satellite System. This paper describes the measurements of the electrical characteristics of the mesh reflecting surface to investigate if the mesh is suitable for the Ka-band of frequency.
{"title":"An experimental study of electrical characteristics of mesh reflecting surface for communication satellite antenna","authors":"A. Miura, M. Tanaka","doi":"10.1109/WCT.2003.1321498","DOIUrl":"https://doi.org/10.1109/WCT.2003.1321498","url":null,"abstract":"While mesh material is often used for the reflecting surface of satellite antennas because it is lightweight and elastic due to its stitched structure, little research and development have been done for the mesh reflecting surface used for the satellite antenna using the frequency such as the Ka-band. A large deployable antenna with 7-m diameter, which provides communications service in the Ka-band, was proposed by the Communications Research Laboratory of Japan, in the framework 'of the research on the Japanese Highly Elliptic Orbital satellite system called the Quasi-Zenith Satellite System. This paper describes the measurements of the electrical characteristics of the mesh reflecting surface to investigate if the mesh is suitable for the Ka-band of frequency.","PeriodicalId":6305,"journal":{"name":"2003 IEEE Topical Conference on Wireless Communication Technology","volume":"227 1","pages":"218-219"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75419721","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.2003.1321503
B. Notaroš, M. Djordjević, M. Ilić
The paper presents the development of novel higher order electromagnetic (EM) modeling techniques for wireless technology applications. The techniques are based on the method of moments (MoM), finite element method (FEM), and physical optics (PO). Modern wireless systems involve electrically large EM structures (antennas, circuits, and components) that are very complex in both geometry and material composition. There is a clear need for advanced analysis and design tools for predicting the performance and optimizing the parameters of such structures prior to costly prototype development. In addition, EM tools are needed for indoor and outdoor propagation modeling, for assessing EM interactions with human bodies, etc. These tools have to be very accurate and reliable. Wireless designers also demand that the simulation techniques be fast and run on relatively small computing platforms, such as standard desktop PCs. Generally, MoM is very efficient at modeling of open-region (e.g., antenna/scattering) problems, while FEM is an excellent choice for modeling of closed-region (e.g., waveguide/cavity) problems. Finally, PO is extremely cost effective for structures that include electrically very large surfaces with slowly varying currents, especially when hybridized with MoM.
{"title":"Higher order electromagnetic modeling for wireless technology applications","authors":"B. Notaroš, M. Djordjević, M. Ilić","doi":"10.1109/WCT.2003.1321503","DOIUrl":"https://doi.org/10.1109/WCT.2003.1321503","url":null,"abstract":"The paper presents the development of novel higher order electromagnetic (EM) modeling techniques for wireless technology applications. The techniques are based on the method of moments (MoM), finite element method (FEM), and physical optics (PO). Modern wireless systems involve electrically large EM structures (antennas, circuits, and components) that are very complex in both geometry and material composition. There is a clear need for advanced analysis and design tools for predicting the performance and optimizing the parameters of such structures prior to costly prototype development. In addition, EM tools are needed for indoor and outdoor propagation modeling, for assessing EM interactions with human bodies, etc. These tools have to be very accurate and reliable. Wireless designers also demand that the simulation techniques be fast and run on relatively small computing platforms, such as standard desktop PCs. Generally, MoM is very efficient at modeling of open-region (e.g., antenna/scattering) problems, while FEM is an excellent choice for modeling of closed-region (e.g., waveguide/cavity) problems. Finally, PO is extremely cost effective for structures that include electrically very large surfaces with slowly varying currents, especially when hybridized with MoM.","PeriodicalId":6305,"journal":{"name":"2003 IEEE Topical Conference on Wireless Communication Technology","volume":"90 1","pages":"229-232"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74966629","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.2003.1321475
C. Song, W. Shiroma, R. Tsai, K. Padmanabhan, B. Bayuk, A. Gutierrez-Aitken
An AlSb/InAs HEMT monolithic grid oscillator is designed using full-wave electromagnetic techniques. Simulations predict an oscillation frequency of 49 GHz with a loop gain of 1.4, which is within 10% of the loop gain corresponding to optimum feedback.
{"title":"Design of a 49-GHz AlSb/InAs HEMT monolithic grid oscillator","authors":"C. Song, W. Shiroma, R. Tsai, K. Padmanabhan, B. Bayuk, A. Gutierrez-Aitken","doi":"10.1109/WCT.2003.1321475","DOIUrl":"https://doi.org/10.1109/WCT.2003.1321475","url":null,"abstract":"An AlSb/InAs HEMT monolithic grid oscillator is designed using full-wave electromagnetic techniques. Simulations predict an oscillation frequency of 49 GHz with a loop gain of 1.4, which is within 10% of the loop gain corresponding to optimum feedback.","PeriodicalId":6305,"journal":{"name":"2003 IEEE Topical Conference on Wireless Communication Technology","volume":"10 1","pages":"175-176"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74277618","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.2003.1321441
D. Anderson, E. Fotheringham, D. Popovic, O. Popovic, S. Romish, P. Smith
This paper presents an overview of the work done at the University of Colorado at Boulder in the area of smart and multibeam antennas, specifically as related to the following projects, funded by the NSF Wireless Initiative: (1) multibeam lens antenna arrays and reconfigurable antennas for wireless communications with diversity. Design and characterization of a 10-GHz multibeam array with two different diversities polarization and angle is presented. A new method of using random reconfiguration of a simple antenna to increase capacity is discussed. This work was done in collaboration with the University of Wisconsin. (2) analog processing that enables principal component analysis (PCA) and independent component analysis (ICA) for broadband signals. The design and performance of a dynamic holographic processor integrated with RF and baseband electronics is discussed. The processor is capable of blind signal separation, otherwise not possible by state-of-the-art DSP for signals with bandwidths above a few kHz. This work was done in collaboration with the Department of Physics and JILA, University of Colorado.
{"title":"Smart and multibeam diversity antenna arrays with high-bandwidth analog signal processing","authors":"D. Anderson, E. Fotheringham, D. Popovic, O. Popovic, S. Romish, P. Smith","doi":"10.1109/WCT.2003.1321441","DOIUrl":"https://doi.org/10.1109/WCT.2003.1321441","url":null,"abstract":"This paper presents an overview of the work done at the University of Colorado at Boulder in the area of smart and multibeam antennas, specifically as related to the following projects, funded by the NSF Wireless Initiative: (1) multibeam lens antenna arrays and reconfigurable antennas for wireless communications with diversity. Design and characterization of a 10-GHz multibeam array with two different diversities polarization and angle is presented. A new method of using random reconfiguration of a simple antenna to increase capacity is discussed. This work was done in collaboration with the University of Wisconsin. (2) analog processing that enables principal component analysis (PCA) and independent component analysis (ICA) for broadband signals. The design and performance of a dynamic holographic processor integrated with RF and baseband electronics is discussed. The processor is capable of blind signal separation, otherwise not possible by state-of-the-art DSP for signals with bandwidths above a few kHz. This work was done in collaboration with the Department of Physics and JILA, University of Colorado.","PeriodicalId":6305,"journal":{"name":"2003 IEEE Topical Conference on Wireless Communication Technology","volume":"3 3 1","pages":"86-89"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74356350","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.2003.1321500
O. Tajima, O. Amada, A. Kezuka
In mobile communication and ITS services, antennas are required to have beam shift and low sidelobe characteristics in order to avoid interference. At millimeter wavelength, dielectric lens antennas are considered promising because of their mass productivity and low costs. In this paper, various shaped lens antennas of low sidelobe characteristics are designed. Sidelobe level changes according to off focus feeds are studied.
{"title":"Off beam characteristics of a shaped lens antenna","authors":"O. Tajima, O. Amada, A. Kezuka","doi":"10.1109/WCT.2003.1321500","DOIUrl":"https://doi.org/10.1109/WCT.2003.1321500","url":null,"abstract":"In mobile communication and ITS services, antennas are required to have beam shift and low sidelobe characteristics in order to avoid interference. At millimeter wavelength, dielectric lens antennas are considered promising because of their mass productivity and low costs. In this paper, various shaped lens antennas of low sidelobe characteristics are designed. Sidelobe level changes according to off focus feeds are studied.","PeriodicalId":6305,"journal":{"name":"2003 IEEE Topical Conference on Wireless Communication Technology","volume":"6 1","pages":"222-223"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73575102","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.2003.1321600
Zhengyuan Xu, Ping Liu, Jin Tang
The minimum variance (MV) technique minimizes output variance of a receiver subject to a constraint which guarantees no cancellation of the desired signal while interference is mitigated. It has been successfully applied to multiuser detection for a direct sequence code-division multiple access (CDMA) system even when multipath channel is unknown. Its applicability in multiple access ultra-wideband (UWB) systems is investigated in this paper. First, similarities between a time-hopping (TH) UWB system using pulse position modulation (PPM) and a multirate CDMA system are explored where a code matrix for each user can be defined based on its unique TH sequence, similar to a spreading code matrix in a CDMA system. Meanwhile, modulation delays are transformed to amplitudes of pulses, yielding a virtually linear model. After following MV optimization procedures, the desired signal can be detected from outputs of a bank of receivers.
{"title":"Blind multiuser detection for impulse radio UWB systems","authors":"Zhengyuan Xu, Ping Liu, Jin Tang","doi":"10.1109/WCT.2003.1321600","DOIUrl":"https://doi.org/10.1109/WCT.2003.1321600","url":null,"abstract":"The minimum variance (MV) technique minimizes output variance of a receiver subject to a constraint which guarantees no cancellation of the desired signal while interference is mitigated. It has been successfully applied to multiuser detection for a direct sequence code-division multiple access (CDMA) system even when multipath channel is unknown. Its applicability in multiple access ultra-wideband (UWB) systems is investigated in this paper. First, similarities between a time-hopping (TH) UWB system using pulse position modulation (PPM) and a multirate CDMA system are explored where a code matrix for each user can be defined based on its unique TH sequence, similar to a spreading code matrix in a CDMA system. Meanwhile, modulation delays are transformed to amplitudes of pulses, yielding a virtually linear model. After following MV optimization procedures, the desired signal can be detected from outputs of a bank of receivers.","PeriodicalId":6305,"journal":{"name":"2003 IEEE Topical Conference on Wireless Communication Technology","volume":"15 1","pages":"453-454"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81921601","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.2003.1321527
C. Waldschmidt, C. Kuhnert, S. Schulteis, W. Wiesbeck
A model for an extended MIMO transmission channel including transmitter, receiver, antennas and the physical channel is presented. For the analysis of compact MIMO systems for small handheld devices, it is inevitable to consider this extended model, since the antennas couple and interact, which influences both SNR and the channel matrix H. Capacity calculations for diversity and beamforming based MIMO systems are given.
{"title":"Analysis of compact arrays for MIMO based on a complete RF system model","authors":"C. Waldschmidt, C. Kuhnert, S. Schulteis, W. Wiesbeck","doi":"10.1109/WCT.2003.1321527","DOIUrl":"https://doi.org/10.1109/WCT.2003.1321527","url":null,"abstract":"A model for an extended MIMO transmission channel including transmitter, receiver, antennas and the physical channel is presented. For the analysis of compact MIMO systems for small handheld devices, it is inevitable to consider this extended model, since the antennas couple and interact, which influences both SNR and the channel matrix H. Capacity calculations for diversity and beamforming based MIMO systems are given.","PeriodicalId":6305,"journal":{"name":"2003 IEEE Topical Conference on Wireless Communication Technology","volume":"20 1","pages":"286-287"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79397472","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.2003.1321561
S. Park, J. Hirokawa, M. Ando
A reflection canceling element composed of a slot with inductive wall in the waveguide is proposed and analyzed. The frequency characteristics are calculated by the method of moments. Only the axial component of electric current along the waveguide height is assumed on the wall. The initial reflection of about -15 dB for isolated longitudinal slot is suppressed below -20 dB over 100 MHz by installing an inductive wall. The use of an inductive wall instead of post contributes to the simple fabrication of the reflection canceling element in single layer slotted waveguide arrays.
{"title":"Analysis and design of a waveguide slot and a reflection-canceling inductive wall","authors":"S. Park, J. Hirokawa, M. Ando","doi":"10.1109/WCT.2003.1321561","DOIUrl":"https://doi.org/10.1109/WCT.2003.1321561","url":null,"abstract":"A reflection canceling element composed of a slot with inductive wall in the waveguide is proposed and analyzed. The frequency characteristics are calculated by the method of moments. Only the axial component of electric current along the waveguide height is assumed on the wall. The initial reflection of about -15 dB for isolated longitudinal slot is suppressed below -20 dB over 100 MHz by installing an inductive wall. The use of an inductive wall instead of post contributes to the simple fabrication of the reflection canceling element in single layer slotted waveguide arrays.","PeriodicalId":6305,"journal":{"name":"2003 IEEE Topical Conference on Wireless Communication Technology","volume":"15 1","pages":"362-363"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82581075","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.2003.1321433
A. Honda, K. Sakaguchi, J. Takada, K. Araki
A six-port receiver can restore the original modulated signal by calculating the detected envelopes and system parameters of the six-port circuit. The system parameters have been determined at each frequency in advance. The six-port receiver has an advantage in the point that the user can select the frequency arbitrarily, but there is a problem of nonlinear distortion in the detector because we use diode detectors for the envelope detection. We propose a novel compensation method for distortion of multiport nonlinear circuits. Computer simulation and experiments were done at frequency 2.45 and 5.85 GHz, and also we evaluate the accuracy by constellation pattern and error vector magnitude (EVM) value.
{"title":"A study of nonlinearity calibration for six-port direct conversion receivers","authors":"A. Honda, K. Sakaguchi, J. Takada, K. Araki","doi":"10.1109/WCT.2003.1321433","DOIUrl":"https://doi.org/10.1109/WCT.2003.1321433","url":null,"abstract":"A six-port receiver can restore the original modulated signal by calculating the detected envelopes and system parameters of the six-port circuit. The system parameters have been determined at each frequency in advance. The six-port receiver has an advantage in the point that the user can select the frequency arbitrarily, but there is a problem of nonlinear distortion in the detector because we use diode detectors for the envelope detection. We propose a novel compensation method for distortion of multiport nonlinear circuits. Computer simulation and experiments were done at frequency 2.45 and 5.85 GHz, and also we evaluate the accuracy by constellation pattern and error vector magnitude (EVM) value.","PeriodicalId":6305,"journal":{"name":"2003 IEEE Topical Conference on Wireless Communication Technology","volume":"20 1","pages":"40-41"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78724842","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.2003.1321536
R. Fisher, Y. Shiraki, K. Tokuda, K. Hamaguchi, Y. Shoji, H. Ogawa
For Pt. 1 see ibid., p.308-9. This paper presents a millimeter-wave ad-hoc wireless access system that was proposed to IEEE 802.15.3 TG3a. The RF, IF, and baseband signal processing is described. The physical frame format and calculated system performance is presented and discussed.
{"title":"Millimeter-wave ad-hoc wireless access system. (2) Proposal of system architecture to IEEE 802.15 TG3a","authors":"R. Fisher, Y. Shiraki, K. Tokuda, K. Hamaguchi, Y. Shoji, H. Ogawa","doi":"10.1109/WCT.2003.1321536","DOIUrl":"https://doi.org/10.1109/WCT.2003.1321536","url":null,"abstract":"For Pt. 1 see ibid., p.308-9. This paper presents a millimeter-wave ad-hoc wireless access system that was proposed to IEEE 802.15.3 TG3a. The RF, IF, and baseband signal processing is described. The physical frame format and calculated system performance is presented and discussed.","PeriodicalId":6305,"journal":{"name":"2003 IEEE Topical Conference on Wireless Communication Technology","volume":"35 1","pages":"310-311"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78920760","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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