Workshop Program

Currently, wireless communication networks in Japan are one of the most important foundations of economic activities and daily life. Furthermore, advancement of wireless communication technology and progress in IoT is expected due to the anticipated use for Telecommunications in various fields such as medical care, education, agriculture, etc.
With this in mind, the latest radio frequency administration and regulations will be discussed, including the current state of radio use, introduction of new wireless systems, 5G, IoT and so on.

<→ * You can read the trial of digest (PDF)>

The overview of the Millimeter-Wave Project 2007-2016 (founded by Ministry of Internal affairs and Communications, Japan) will be presented. It demonstrates 1) 6.1Gbps mmWave access at 60GHz band between a smartphone terminal and a small-cell BS, 2) 60GHz compact range communication system using a 32x32 array to provide enhanced communication area up to 15m and 3) 40GHz outdoor system with full-duplex capability 2x1Gbps to enhance the spectral efficiency. The concept of mmWave integrated 5G heterogeneous networks (HetNet) using 40 and 60GHz bands are demonstrated.
In the demonstration, pedestrian users experience off-loading from Wifi (5GHz) to 60GHz and download a big files when passing through the series of GATEs.

<→ * You can read the trial of digest (PDF)>

Fifth-generation mobile communications system, 5G, is required to accommodate a drastic traffic increment expected in future advancement and diversity of wireless services.
In this session, representative research members will present the progress and outcomes of "The research and development projects for realization of the fifth-generation mobile communications system" which are promoting by The Ministry of Internal Affairs and Communications, Japan, from 2015.

Keyword ： 5G, High Capacity, High Data Rate and Low Power Consumption Radio Access,
Coordinated Management Framework

The analysis techniques of the quadrature modulation-demodulation for digital wireless communications are presented. Based on Fourier transform, it is modeled by simple mathematics and illustrated the behavior. Then, by introducing the RC-polyphase filter and the Hilbert transform, the relationship between them and the quadrature modulation-demodulation is considered.
Finally, as an example of the application, the behavior of the modulator with IQ imbalances which is one of significant problem in the wide-band wireless communications is shown, and it leads to how to decide the stimuli and analyze the responses from the circuit under test.

Keyword ： Digital Modulation, Quadrature Modulation-Demodulation, Hilbert Filter, Image Rejection, IQ-Imbalance

When the transfer data rate exceeds 1Gbit/s, the signal quality is degraded by increasing of transmission line loss. These losses are explained as the effect on signal quality. And the techniques to get wider eye patterns, are presented. In addition, a theoretical analysis of the differential cross-talk is presented as functions of line length, circuit constant and PCB layer structure.

Keyword ： Differential Transmission, Lossy Line, Eye-Pattern, Jitter, Differential Crosstalk

Research and development of wireless power transfer (WPT) technologies are presently accelerated in the world. For further R&D, commercialization, and industrialization, electromagnetic compatibility of the WPT and impact study to conventional wireless system is required and important. The WPT is roughly considered as two technologies, inductive coupling/resonance coupling WPT in kHz-MHz band and WPT in far field via UHF . microwave.
In this session, all WPT technologies are included.

Keyword ： Wireless Power Transfer, Inductive Coupling WPT, Microwave Power Transfer, EMC

The fields of factories and mines are tough environments for wireless communications. There are large obstacle objects for radio propagation, legacy wireless terminals attached to old manufacturing and construction machines, noises from machines, a large number of mobile terminals in a closed space, and coexistence of a variety of wireless systems and so on. These are issues to be carefully considered to deploy wireless systems in the fields. In the future, more wireless devices such as sensors, RFID tags, and monitoring systems are expected to be introduced to enhance productivity in the above environment. But what is a barrier for that?
In this workshop, based on "real data" obtained from the fields, technologies required for wireless terminals and systems and efforts to realize them in factories and mines will be discussed.

Keyword ： Factory Wireless System, Mine Wireless System, Wireless Environment, Propagation Model, Handover, M2M, IoT, Metering

The aim of these extreme introductory courses WE6B and TH6B、is to drive "too basic to ask" questions through the radical discussion.
In this WE6B session, basic skills and methods on microwave circuit measurements are introduced. A few points to be noted on of the measurements are also discussed from a viewpoint of theoretical and practical cases.

Keyword ： Microwave Circuit Measurements, S-parameter, Active Circuits, Passive Circuits, Amplifier