The Experts below are selected from a list of 47739 Experts worldwide ranked by ideXlab platform
H Ogawa - One of the best experts on this subject based on the ideXlab platform.
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Millimeter Wave wireless personal area network systems
Radio Frequency Integrated Circuits Symposium, 2006Co-Authors: H OgawaAbstract:A Millimeter-Wave wireless personal network (WPAN) system is designed to provide short-range, high-speed multi-media data services to terminals in rooms or office space. Millimeter-Wave ad-hoc wireless access system has been developed by the Yokosuka Research Park (YRP) collaborated group which was organized by NICT Yokosuka Radio Communication Research Center. This system is designed to provide easy connectivity, network flexibility and high transmission data rate suitable for WAPN service. The Millimeter-Wave ad-hoc system and its technologies, and the other 60-GHz applications are first presented, the Millimeter-Wave interest (mmWIG), study (SG3c) and task (TG3c) groups which were recently organized and approved within IEEE802.15 are introduced and its activity are presented.
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Millimeter Wave wireless personal area network wpan and its standardization activity within ieee802 15
International Conference on Microwave and Millimeter Wave Technology, 2004Co-Authors: H OgawaAbstract:A Millimeter Wave wireless personal network (WPAN) system is designed to provide short-range, high-speed multimedia data services to terminals in rooms or office space. Millimeter Wave ad hoc wireless access system has been developed by the Yokosuka Research Park (YRP) collaborated group which was organized by NICT Yokosuka Radio Communication Research Center. This system is designed to provide easy connectivity, network flexibility and high transmission data rate suitable for WAPN service. The Millimeter Wave ad hoc system and its technologies were presented, and the Millimeter Wave interest and study groups which were recently organized and approved within IEEE802.15 were introduced and its activity presented.
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Millimeter Wave fiber optics systems for personal radio communication
IEEE Transactions on Microwave Theory and Techniques, 1992Co-Authors: H Ogawa, D Polifko, S BanbaAbstract:System concepts for Millimeter-Wave personal communication systems and the advantages of Millimeter-Wave band usage are briefly described. Demonstration of broadband Millimeter-Wave subcarrier transmission concepts over fiber-optic links is performed. Several fiber-optic link architectures, including one using a combination of direct laser modulation and indirect (external) optical modulation, are outlined with respect to signal transmission at Millimeter-Wave frequencies. Several configurations are experimentally investigated using 70-MHz, 300-MHz, and 26-GHz subcarriers which transmit either FM or QPSK data signals. Additionally, the use of optical MMIC technology, which can result in the design of compact and cost-effective optical receivers, is described with respect to personal communication radio base station equipment. MMIC HEMTs operating as photodetectors are newly characterized in terms of digital and analog signal reception with excellent performance being observed. >
S Banba - One of the best experts on this subject based on the ideXlab platform.
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Millimeter Wave fiber optics systems for personal radio communication
IEEE Transactions on Microwave Theory and Techniques, 1992Co-Authors: H Ogawa, D Polifko, S BanbaAbstract:System concepts for Millimeter-Wave personal communication systems and the advantages of Millimeter-Wave band usage are briefly described. Demonstration of broadband Millimeter-Wave subcarrier transmission concepts over fiber-optic links is performed. Several fiber-optic link architectures, including one using a combination of direct laser modulation and indirect (external) optical modulation, are outlined with respect to signal transmission at Millimeter-Wave frequencies. Several configurations are experimentally investigated using 70-MHz, 300-MHz, and 26-GHz subcarriers which transmit either FM or QPSK data signals. Additionally, the use of optical MMIC technology, which can result in the design of compact and cost-effective optical receivers, is described with respect to personal communication radio base station equipment. MMIC HEMTs operating as photodetectors are newly characterized in terms of digital and analog signal reception with excellent performance being observed. >
Ting Wang - One of the best experts on this subject based on the ideXlab platform.
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optical Millimeter Wave generation or up conversion using external modulators
IEEE Photonics Technology Letters, 2006Co-Authors: Jianjun Yu, Zhensheng Jia, Lilin Yi, Yikai Su, Geekung Chang, Ting WangAbstract:We have experimentally compared the performances of optical Millimeter-Wave generation or up-conversion using external modulators based on different modulation schemes. The generated or up-converted optical Millimeter Wave using the optical carrier suppression (OCS) modulation scheme shows the highest receiver sensitivity, highest spectral efficiency, and smallest power penalty over long-distance delivery. Moreover, the OCS modulation scheme has a simple configuration and low-frequency bandwidth requirement for both electrical and optical components. Employing an OCS modulation scheme, 16-channel dense Wavelength-division multiplexing signals at 2.5-Gb/s per channel have been up-converted to a 40-GHz carrier simultaneously.
Marco Di Renzo - One of the best experts on this subject based on the ideXlab platform.
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Stochastic Geometry Modeling and Analysis of Multi-Tier Millimeter Wave Cellular Networks
IEEE Transactions on Wireless Communications, 2015Co-Authors: Marco Di RenzoAbstract:In this paper, a new mathematical framework to the analysis of Millimeter Wave cellular networks is introduced. Its peculiarity lies in considering realistic path-loss and blockage models, which are derived from recently reported experimental data. The path-loss model accounts for different distributions of line-of-sight and non-line-of-sight propagation conditions and the blockage model includes an outage state that provides a better representation of the outage possibilities of Millimeter Wave communications. By modeling the locations of the base stations as points of a Poisson point process and by relying on a noise-limited approximation for typical Millimeter Wave network deployments, simple and exact integral as well as approximated and closed-form formulas for computing the coverage probability and the average rate are obtained. With the aid of Monte Carlo simulations, the noise-limited approximation is shown to be sufficiently accurate for typical network densities. The proposed mathematical framework is applicable to cell association criteria based on the smallest path-loss and on the highest received power. It accounts for beamforming alignment errors and for multi-tier cellular network deployments. Numerical results confirm that sufficiently dense Millimeter Wave cellular networks are capable of outperforming micro Wave cellular networks, both in terms of coverage probability and average rate.
Theodore S Rappaport - One of the best experts on this subject based on the ideXlab platform.
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Millimeter Wave wireless communications new results for rural connectivity
Proceedings of the 5th Workshop on All Things Cellular: Operations Applications and Challenges, 2016Co-Authors: George R Maccartney, Shu Sun, Theodore S Rappaport, Yunchou Xing, Hangsong Yan, Jeton Koka, Ruichen WangAbstract:This paper shows the remarkable distances that can be achieved using Millimeter Wave communications, and presents a new rural macrocell (RMa) path loss model for Millimeter Wave frequencies, based on measurements at 73 GHz in rural Virginia. Path loss models are needed to estimate signal coverage and interference for wireless network design, yet little is known about rural propagation at Millimeter Waves. This work identifies problems with the RMa model used by the 3rd Generation Partnership Project (3GPP) TR 38.900 Release 14, and offers a close-in (CI) reference distance model that has improved accuracy, fewer parameters, and better stability as compared with the existing 3GPP RMa path loss model. The measurements and models presented here are the first to validate rural Millimeter Wave path loss models.
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the human body and Millimeter Wave wireless communication systems interactions and implications
International Conference on Communications, 2015Co-Authors: Theodore S Rappaport, Christopher M CollinsAbstract:With increasing interest in Millimeter-Wave wireless communications, investigations on interactions between the human body and Millimeter-Wave devices are becoming important. This paper gives examples of today's regulatory requirements, and provides an example for a 60 GHz transceiver. Also, the propagation characteristics of Millimeter-Waves in the presence of the human body are studied, and four models representing different body parts are considered to evaluate thermal effects of Millimeter-Wave radiation on the body. Simulation results show that about 34% to 42% of the incident power is reflected at the skin surface at 60 GHz. This paper shows that power density is not suitable to determine exposure compliance when Millimeter Wave devices are used very close to the body. A temperature-based technique for the evaluation of safety compliance is proposed in this paper.
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the human body and Millimeter Wave wireless communication systems interactions and implications
arXiv: Emerging Technologies, 2015Co-Authors: Theodore S Rappaport, Christopher M CollinsAbstract:With increasing interest in Millimeter Wave wireless communications, investigations on interactions between the human body and Millimeter Wave devices are becoming important. This paper gives examples of current regulatory requirements, and provides an example for a 60 GHz transceiver. Also, the propagation characteristics of Millimeter-Waves in the presence of the human body are studied, and four models representing different body parts are considered to evaluate thermal effects of Millimeter-Wave radiation on the body. Simulation results show that about 34% to 42% of the incident power is reflected at the skin surface at 60 GHz. This paper shows that power density is not suitable to determine exposure compliance when Millimeter Wave devices are used very close to the body. A temperature-based technique for the evaluation of safety compliance is proposed in this paper.
