Workshop Program

In the first part of this session, we will overview the evolution of mobile communications systems from the 1st generation (1G) to 4G and then, introduce recent advances in broadband mobile radio communication techniques to be used in 5G.
In the latter half of this session, we will introduce the simulation technique to improve design and verification of the communication system more efficiently.

Keyword ： Mobile Radio Communications System, 5G, Cooperative Transmission, Wireless System Design, Simulation Technique

The 5^th generation mobile telecommunication system (5G), which will be in service in 2020, is attracting much attention. Research and development is being accelerated all over the world. Massive MIMO technology enables the higher frequency bands above 6GHz for 5G, which has been consider not suitable due to its short propagation range. Also massive MIMO enables spatial multiplexing to enhance spectral efficiency drastically. Meanwhile, many challenges still exist, e.g. use of channel reciprocity, beam steering, how to implement the circuits of massive MIMO antennas etc.
In this workshop, fundamentals of massive MIMO and its direction of research and development are introduced together with perspectives from operators and system integrators points of view.

Keyword ： 5G, Massive MIMO, Above 6GHz, Spectral Efficiency, Channel Reciprocity, Beam control, Antenna Elements Implementation

Operation service of Quasi-Zenith Satellite System (QZSS) plan to be started on April of 2018 supports GPS compatible signals, and highly accurate augmentation service signals. Recently, GNSS including Galileo, Beidou is expected to be applied for automatic driving and other systems realized by low-cost and highly accurate GNSS receiver technology.
In this workshop session, recent satellite positioning technology will be discussed focusing on development status of QZSS, satellite navigation and receiver technology, and applications.

Keyword ： Satellite Positioning, Global Navigation Satellite System, High-Precision Positioning, Satellite Navigation, 3-Dimensional Mapping

The modulated signals with higher bandwidth and more complex scheme are used to realize higher data rate in 4G/5G systems, and the demand of multiband multimode operation is increasing. As an alternative solutions to current architectures, high flexible and high efficient circuit techniques with digital elements have been proposed and prototyped.
This workshop covers the recent flexible PA/Tx efficiency enhancement techniques.

Keyword ： Mobile Base-Station, Envelope Tracking Amplifier, Switching Amplifier, Digital Transmitter, High Efficiency Technique, Flexible Technique

Electronic device technologies above 100GHz have been actively progressing in this few years. InP devices have been applied to an experimental demonstration of 300-GHz wireless communications. Silicon CMOS integrated circuits have been utilized for a 140-GHz 3D scanning radar and 300-GHz wireless transceivers having data rate of 100Gbit/s. Power modules, which are difficult to be made by semiconductor, have been developed with tube amplifier technology.
In this workshop, recent topics of these movement will be discussed.

Keyword ： Millimeter Wave, Terahertz, Electronic Device, Communication, Radar

Terahertz, which is an intermediate wavelength between radio waves and light, is the frontier of the last electromagnetic waves. In recent years, terahertz has been used for various applications by improving the performance of light sources and receivers. In addition to nondestructive inspection and high-speed communication, the application field extends to the universe such as radio astronomy and planetary exploration.
This workshop introduces the latest application of a wide range of terahertz technologies.

Keyword ： Millimeter Wave, Terahertz, Communication, Sensing, Space, Astronomy

Electromagnetic simulator had become indispensable tool for efficient development of high frequency circuits. The Q value, which is a kind of a figure of merit, is well known index in resonators, oscillators and filters.
MWE workshops on series of simulation topic have been focused on excitation problems. This workshop focuses on non-excitation problem for the analysis of resonators. Eigenvalue analysis of a cuboid cavity will be explained. Practical use of simulators will be presented by simulator vendors and tips will be shared with discussions.

Keyword ： Electromagnetic Simulation, Exact Solution, Resonance, Eigenvalue Problem, Cuboid Resonant Cavity, Simulator, Q Value

Although VHF and UHF bands have been used for railway radiocommunication system, the current traffic demands between train and trackside for safety and secure operation and broadband internet service to passengers require high-capacity transmission systems between train and trackside. Millimeter-wave frequencies are one of spectrum resources to support high-speed data transmission between train and trackside.
In this workshop, millimeter-wave technologies such as sub-systems, components, devices for railway radiocommunication system which supports high-speed data transmission will be introduced by experts in the area of railway radiocommunication systems.

Keyword ： High-Speed Railway Radiocommunication System, High-Speed Safety Transportation System, Millimeter-Wave Technology, On-Board Radio Equipment, Trackside Radio Access Equipment, Radiocommunication System Between Train and Trackside

S parameter measurement is fundamental and important techniques not only for qualification of devices and systems but also for high frequency characteristics of materials. Especially understanding the physical meaning of the S parameter and familiarity with the measurement principle of the vector network analyzer is the most important and fundamental for realizing the correct measurement.
In this basic course, we will explain the physical meaning of S parameters, measurement principle of vector network analyzer and basic measurement method.

Keyword ： High Frequency Measurement, S-Parameter, Vector Network Analyzers, 6-Port Measurements

Utilization of electromagnetic waves is diverse such as automobile collision prevention radar, 5th generation mobile communication, 4K / 8K high-vision broadcasting. In order to realize these products, it is necessary to evaluate electromagnetic characteristics of materials, measurement at the device and circuit level, as well as measurement at the component and system level.
In this section, we will explain the latest technology trends on measurement technologies of 75Ω series components for broadcasting, as well as material characteristics of millimeter wave bands to be used in 5th generation mobile phones, on-wafer measurement and component level measurement.

Keyword ： Millimeter-Wave Measurements, Material Characterization, On-Wafer Measurements, Communication and Broad Casting, Vector Network Analyzers

S-parameters are usually referenced to a real reference resistance of 50Ω. At times, S-parameters normalized to some complex reference impedance are used out of necessary or for convenience'sake. Since there are incompatible definitions of complex-referenced S-parameters, it is important to use the right one for your purpose. This raises the following questions: How does my EM/microwave simulator define S-parameters? Which S-parameters does my vector network analyzer (VNA) measure?
It is shown, for example, that two EM simulators from a single vendor adopt incompatible S-parameter definitions, which could lead to possible mishaps unless the user is careful.

Keyword ： S-Parameters, Electromagnetic Simulator, Microwave Simulator, Vector Network Analyzer (VNA), Reference Impedance

Two-port circuit parameters are very useful parameters for a simple circuit analysis of black box, as well as for a complex analysis of the circuits composed of multi, several types of two-port circuit parameters.
In the tutorial lecture, the actual utilization methods of two-port circuit parameters for transistor circuit design are demonstrated conducting the basic understanding and the application skill.

Keyword ： Two-Port Circuit Parameters, h-Parameters, S-Parameters