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International Conference on Telecommunications and Signal Processing

作者： Walter Orozco-Tupacyupanqui Hector Perez-Meana Mariko Nakano-Miyatake Graduated PhD program in Communication and Electronic Engineering National Polytechnic Institute Graduate studies and Research section of The Mechanical and Electrical Engineering School National Polytechnic Institute

ISBN: (纸本)9781479984992

This paper proposes a new application based on fuzzy logic to search the optimal Step Size of the Normalized Least Mean Square (NLMS) algorithm for beamforming systems. The searching of the step size depends on the fuzzy inference results of an estimation of the final value of the cost function (J_E) instead of using its instantaneous value. The update of the step-size is performed outside of the adaptive algorithm and given it feedback by the fuzzy inference system;therefore the step-size is still fixed for the NLMS algorithm but variable for the complete searching scheme. Simulation experimental results show that a useful approximation of the optimal step-size can be obtained for different conditions of signal-to-noise plus interference ratios (SINR) and the minimization of the mean square error for the adaptive beamforming algorithm is also achieved.

关键词： Adaptive linear array communication systems Fuzzy inference systems Normalized least mean square (NLMS) algorithm Smart antennas

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Soliton system evaluations using fibers with dispersion and loss fluctuations

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electronicS AND communicationS IN JAPAN PART II-electronicS 1996年第4期79卷 77-84页

作者： Ishiba, K Komatsu, T Takahara, M Faculty of Engineering Yamanashi University Kofu Japan 400 Graduated in 1994 from the Department of Electronic and Information Engineering where he is currently in the Master's program. He has been engaged in research on optical fiber soliton transmission. Received his B.S. and M.S. degrees in 1993 and 1995 respectively from the Department of Electronic and Information Engineering Yamanashi University. He joined NTT in April 1995. He has been engaged in research on simulation of the optical fiber soliton transmission and on the transmission system with flexibility in transmission speed. Graduated from the Department of Electrical Engineering Yamanashi University in 1965 and received his M.S. degree in 1967. He received his Ph.D. degree later. In 1967 he became a Research Associate of the Department of Electronic Engineering Yamanashi University. In 1991 he became a Professor of Electronic and Information Engineering. He has been engaged in research on special function theory nonlinear circuits optical communication systems and LAN systems. In 1984 he received a Book Award from I.E.I.C.E. In 1990–91 he was on leave at Southampton University. He is a member of IEEE.

In the development of practical multimedia systems, greater capacity is desired in a long-distance large-capacity transmission system. A number of studies have been undertaken to develop a long-distance large-capacity system. Several long-distance transmission experiments for high-density transmission by wavelength demultiplexing method (WDM) have been reported recently. However, more of the experimental examples have reported on soliton transmission than on WDM systems. Hence, the former is considered more advanced. It is necessary to prepare a fiber of a length of approximately 10,000 km for ultralong-distance transmission experiment. Since this is difficult to obtain, repetitive experiments are often the case. However, such an experiment does not disclose the effects of dispersion and loss fluctuation in the fiber. In this paper, the effect of fluctuation in dispersion and loss in the fiber is studied by simulation so that the resilience of the soliton to the variations of the fiber characteristics is evaluated.

关键词： optical soliton dispersion fluctuation loss fluctuation Gordon-Haus jitter

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Propagation properties of Love wave-type surface-acoustic wave on alpha-quartz

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electronicS AND communicationS IN JAPAN PART II-electronicS 1996年第2期79卷 24-30页

作者： Isobe, A Hikita, M Asai, K Central Research Laboratory Hitachi Ltd. Kokubunji Japan 185 (Member) graduated from the Department of Physics Tohoku University in 1986 and completed an M.S. course in 1988. In that year he joined Hitachi Ltd. Presently he is with Hitachi Central Research Laboratory. He has been engaged in research on surface acoustic wave devices. (Member) completed the doctoral program of the Department of Electronic Engineering Hokkaido University in 1977 and remained as a research student. In 1978 he joined Hitachi Ltd. Presently he is a Senior Researcher at Hitachi Central Research Laboratory. He holds a Doctor of Engineering degree. He has been engaged in research on the electromagnetic field analysis boundary value problem of the surface acoustic wave interaction of the acoustic wave and optics high-performance SAW filter high-frequency circuit for satellite communication and mobile communication. In 1981 he received an Academic Promotion Award from I.E.I.C.E. In 1990 he received an IEEE MTT Microwave Prize Award. In 1991 he received a Kanto District Invention Award (from the Invention Society) and in 1993 a Commendation for Research Accomplishment from the Director of Science and Technology Agency. He is a senior member of IEEE. (Member) graduated from the Department of Mechanical Engineering Matsuyama Technical High School in 1984 and joined Hitachi Central Research Laboratory. In 1988 he graduated from the Department of Electronic Engineering Hitachi Keihin Technical School. Since then he has been engaged in research and development of the process technology of magnetic bubble memory and surface acoustic wave devices. Presently he is with the Communication Systems Department.

As a piezoelectric substrate for surface acoustic wave devices, the LST cut quartz has good temperature characteristics and low propagation loss. However, as the thickness of the metal electrodes on the substrate surface is increased, propagation loss also increases. Further, the electromechanical coupling coefficient is small. In this paper, a cut angle of the quartz substrate is sought that has excellent temperature stability, low propagation loss, and a large electromechanical coupling coefficient in the present of metal electrode films. For the rotated Y-cut substrate in the neighborhood of the LST cut, the propagating surface acoustic wave (SAW) merle changes from the leaky surface wave to the Love wave-type surface acoustic wave for which. no propagation loss occurs in theory while the electromechanical coupling coefficient increased to 0.5 percent at the maximum if gold is used for the electrodes and the propagation direction of the SAW is shifted from the X axis. This is shown by simulation. By experiment, it is shown that the second-order temperature coefficient is on the same order as that of the ST-cut quartz substrate.

关键词： surface acoustic wave quartz Love wave temperature characteristics

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Analysis of nonreciprocal mode-conversion properties of magnetooptic channel waveguides using the finite element method

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electronicS AND communicationS IN JAPAN PART II-electronicS 1996年第10期79卷 32-39页

作者： Zhuang, XP Koshiba, M Tsuji, Y Faculty of Engineering Hokkaido University Sapporo Japan 060 Graduated from the Department of Communication Engineering Guellin Electronic Institute China in 1986. She received her M.S. degree from Hokkaido University in 1991 and was admitted to the doctoral program. She has been engaged in research on the optimum design of magnetooptic waveguides for nonreciprocal optical devices. Graduated in 1971 from the Department of Electronic Engineering Hokkaido University where he received his M.S. degree in 1973 and his Dr. of Eng. degree in 1976. In 1976 he became a Lecturer in the Department of Electronic Engineering Kitami Institute of Technology where he was promoted to Associate Professor in 1977. In 1979 he became an Associate Professor at Hokkaido University where he was promoted to Professor in 1987. He has been engaged in research on optical and wave electronics. In 1987 he received a Best Paper Award. He is the author ofFundamentals of Finite Element Method of Optics and Waves(Morigkata Publ.)Optical Waveguide Analysis(Asakura Publ.)Optical Waveguide Analysis(McGraw-Hill Book Co.) andOptical Waveguide Theory by the Finite Element Method(KTK Scientific Publishing/Kulwer Academic Publishers). He is also co-author of one book and has written chapters in six other books. He is a member of the Institute of Television Engineers of Japan the Institute of Electrical Engineers of Japan the Japan Society for Simulation Technology the Japan Society for Computational Methods in Engineering and the Japan Society of Applied Magnetics and Mechanics. He is also an IEEE Senior Member. Graduated in 1991 from me Department of Electronic Engineering Hokkaido University where he received his M.S. degree in 1993. He is currently in the doctoral program. He has been engaged in research on quantum wave phenomena and computer-aided design of optical and quantum effect devices.

To evaluate nonreciprocal mode conversion characteristics in a magnetooptic channel waveguide, a finite element analysis based on the scalar wave approximation is formulated for the first time. A simple iterative calculation method is conceived for solution of the nonlinear eigenvalue equations finally obtained in which the two polarizations are coupled. Specifically, the maximum isolation ratio in the mode-conversion-type magnetooptic rib guide was evaluated and the validity of the method is confirmed by comparison with published experimental results.

关键词： nonreciprocal optical devices magnetooptic waveguide nonreciprocal mode conversion finite element method numerical analysis

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Measurement of refractive index distribution of optical waveguides by the propagation mode near-field method employing an improved inverse analysis

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electronicS AND communicationS IN JAPAN PART II-electronicS 1996年第9期79卷 21-29页

作者： Yabu, T Sawa, S Geshiro, M Faculty of Engineering Osaka Prefecture University Sakai Japan 593 Graduated from the Department of Electronic Engineering Doshisha University in 1989 and received his M.S. degree from Kyoto University in 1991. He withdrew from the doctoral program in 1993 and became a Research Associate at Osaka Prefecture University. He has been engaged in research on optical waveguides. Graduated from the Department of Electrical Engineering Osaka Prefecture in 1962 and joined Mitsubishi Electric remaining there until he left in 1964. He received his M.S. He received his M.S. and Dr. of Eng. degrees from Osaka University in 1967 and 1970 respectively. In 1970 he became an Associate Professor at Ehime University in the Department of Electronic Engineering where he was promoted to Professor in 1976. In 1991 he became Professor of Osaka Prefecture University in the Department of Electrical Engineering and in 1993 Professor in the Department of Electrical and Electronic Systems Engineering. He has been engaged in research on optical waveguides optical integrated circuits optical fibers and planar antennas. He is a member of IEEE Laser Society and the Institute of Electrical Engineers of Japan. Graduated in 1973 from the Department of Communication Engineering Osaka University and received his M.S. and Dr. of Eng. degrees in 1975 and 1978 respectively. In 1979 he became a Research Associate at Ehime University where he was promoted to an Associate Professor in 1984. In 1986–87 he was on leave at the University of Texas at Austin. In 1994 he became an Associate Professor at Osaka Prefecture University. He has been engaged in research on optics and millimeter wave and microwave waveguides. He is a member of IEEE.

A method to estimate the refractive index profile of an optical waveguide exists in which the optical intensity distribution of the only one propagation mode is used. Since this method requires only a microscope and a television camera, setup is extremely simple and inexpensive, thereby making the method practical. The differential processing method and the inverse analysis method have been proposed as methods to use the optical intensity distribution of only one propagation mode. The mechanisms of these methods that use the optical intensity distribution are presented in detail here. As a consequence, a new method that overcomes the difficulties in the previous methods, to be called Improved Inverse Analysis Method with Fewer Parameters, is proposed. Further, by using this proposed method, the index profiles of the step-index type optical fiber and the buried optical waveguide can be estimated in order for validity of the method to be studied.

关键词： optical waveguide refractive index profile image measurement

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FLEET COMMUMICATIONS SUPPORT‐VIA SATELLITES

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Naval Engineers Journal 1967年第3期79卷 389-394页

作者： VAN ORDEN, M.D. USN The Author graduated from the U. S. Naval Academy in 1944 where he received the BS degree he received the BSEE from M.I.T. in 1949 and the MBA from George Washington University in 1964 at the present time he is a candidate at the George Washington University for PhD. After a variety of assignments at sea and ashore Captain Van Orden was designated an Engineering Duty Officer (Electronics). For the past ten years he has been active in R&D programs—as Program Officer at the Navy Electronics Laboratory as a charter member of the Defense Communications Agency R&D Directorate as a member of the System Development Division CNM and as Project Manager for Satellite Communications Project in the Bureau of Ships with additional duty as Program Director SATCOM Program Office of CNO. He is presently Project Manager SATCOM Project Naval Electronic System Command.

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NUMERICAL-METHOD FOR CALCULATING SURFACE CURRENT-DENSITY ON 3-DIMENSIONAL SMOOTH SCATTERERS

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electronicS AND communicationS IN JAPAN PART II-electronicS 1994年第2期77卷 1-11页

作者： IKUNO, H GONDO, M NISHIMOTO, M Faculty of Engineering Kumamoto University Kumamoto Japan 860 Himyoshi Ikmo received his B.E. M.E. and Ph.D. from Kyushu University in 1962 1964 and 1979 respectively. From 1967 to 1970 he was a Research Associate in Computer Science and Communication Engineering at Kyushu University. He joined the Department of Electrical Engineering and Computer Science of Kumamoto University in 1970 and is currently a Professor there. During 1983 to 1984 he was a Visiting Professor at the Polytechnic University Brooklyn NY. His research interests are in the areas of scattering diffraction and wave propagation in the theory of electromagnetics. Dr. Ikuno is a member of IEEE and IEE of Japan. Michim Gondo graduated from National Defense Academy Yokosuka in 1985 and received his M.E. from Kumamoto University in 1990. He is currently in the doctoral program at Kumamoto University. His research interest is in three-dimensional electromagnetic scattering. Masahiko Nkhimoto received his B.S. in Electronic Engineering from Kumamoto University in 1982 and an M.S. and Ph.D. from Kyushu University in 1984 and 1987 respectively. Since 1987 he has been a Research Associate in the Department of Electrical Engineering and Computer Science Kurnamoto University. His research interests are in the areas of scattering and diffraction of electromagnetic waves.

This paper shows that the surface current density can be calculated by using approximate total tangent magnetic vector fields which are expressed by finite number of linear combination of tangent vectors of spherical wave functions. Sampling points are determined by considering the property of associated Legendre functions and trigonometrical functions. By setting a number of sampling points to twice the largest mode number, a computer-aided algorithm is obtained. The accuracy of the solutions is checked and the polarization dependence of the surface current densities is clarified.

关键词： YASUURA METHOD 3-DIMENSIONAL PROBLEM BODY OF REVOLUTION LEAST-SQUARES PROBLEM

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Guest Editorial: Focus on Digital Signal Processing Techniques Applied to Space communications

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European Transactions on Telecommunications 1993年第1期4卷 9-10页

作者： Gaudenzi, Riccardo De Elia, Carlo Harris, Robert A. Rimrdo De Gaudend was born in Rosignano Mmo Italy in 1960. He received the Doctor En- gineer degree (cum Laude) in Electronic Engineering from the University of Pisa. Italy in 1985. From 1986 he was with the European Space Agency (ESA). Stsliow and Communications Engineering Department. Darmrtadt (RFA) where he was involved in satellite telecommunication ground systems design and testing. In particular he followed the development of two new ESA's satellite tracking systems. In 1988 be joined the ESA's Research and Technology Centre (ESTEC). Noordwijk. The Netherlands where is holding a position as releeommunication enginm in the Electrical System Department. He is presently responsible for the definition and development of advanced satellite communication systems. His mull intenst b ddyrducd with effacnt digital modulation and access techniques for fued and mobile wtdlite services synchronization topics and communication systems simulation techniques. Carlo Elia (S'89) was born in Trepuzzi. Italy in 1964. He received the Doctor Engineer degree in Electronic Engineering from Politecnico di Torino. Torino. Italy. in 1989. He his now attending a Doctorate program at PolitanieO di Torino. S i 1990. he has been with the Eurpean Space Agency (ESA) in the Electrical System Department as Tdeeommunications Syrtcm Engineer. His main areas of interest are related to rdvanccd digital modulation and access techniques and channel equalization. R.A. (Bob) Harris (S'69–M'70) received the PhD from the University of Southampton. England in 1971. In 1970 he joined the European Space Agency (then ESRO). based at the European Space Research and Technology Centre (ESTEC) Noordwijk. The Netherlandswas working on telemetry and telecommand systems. Since 1978 he has been Head of the Transmision Techniques Section in the Directorate of Telecom munications. He was involved in the transmission design of the OTS ECS Olympus and European Data Relay systems. He has worked on a wide range of analogue and digital transmission topics wit

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SCIENCE, TECHNOLOGY, AND MANPOWER IN THE NAVY

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Journal of the American Society for Naval Engineers 1956年第1期68卷 49-56页

作者： BENNETT, RAWSON USN Chief of Naval Research THE AUTHOR was born on June 16 1905. in Chicago Illinois. He was appointed to the U. S. Naval Academy Annapolis. Maryland from California in 1923. Graduated and commissioned Ensign on June 2 1921 he subsequently advanced to the rank of Captain to date from March 20 1945. In December 1955 he was appointed Rear Admiral to date from January 3 1956. Following graduation in 1927 he joined the USS California flagship of the Battle Fleet. Later in 1928. he was assigned communication duty on the staff of Commander Battle Fleet serving as such until August 1930. In November of that year he reported on board the USS Isabel for duty on Asiatic Station and in October 1932 was transferred to the USS Rochester. He completed his Asiatic tour of duty in the USS Houston in 1933. Detached from this vessel he returned to the United States and joined the USS Idaho. After 7 years of sea duty he returned to Annapolis Maryland for postgraduate instruction in radio (electronic) engineering. He completed the course in May 1936 and was assigned to the University of California Berkeley for additional postgraduate work receiving the Master of Science degree in Electrical Engineering after which he reported aboard the USS Concord. Continuing sea duty he joined the staff of Commander Destroyer Division Nineteen (later redesignated Destroyer Fifty) in April 1938 and served as Radio and Sound Officer until June 1941. Starting in July 1939 he set up the technical program of the first fleet Sound School at San Diego California. In July 1941 he reported to the Bureau of Ships Navy Department Washington D.C. There he served first as Head of the Underwater Sound Design Section of the Radio Division and later Head of Electronics Design Division from 1943 to 1946. He was awarded the Legion of Merit “for exceptionally meritorious conduct” during this tour of duty. Upon leaving the Bureau of Ships in August 1946 he reported as Director of the U. S. Navy Electronics Laboratory Point Loma

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