Communications engineering laboratory

Professor Hideo KOBAYASHI
koba@elec.mie-u.ac.jp

Tech. Staff Yoshihiro YAMAMOTO
yamamoto@com.elec.mie-u.ac.jp

Comunications engineering laboratory Home Page

Summary:
Recent tremendous evolution in digital telecommunications allows people to enjoy Internet, Car Navigation, Cellular Phone, Cordless Phone, CATV, Satellite and Terrestrial based TV broadcasting services with ease and low cost terminal and charge. The next generation systems for serving digital telecommunications are requested to provide multimedia services demanded by users through cable and radio link with higher quality and higher availability. To realize the next generation systems for serving the Multimedia Telecommunications, Communications Engineering Laboratory in the Department of Information and Communications Engineering is making intensive researches, especially in the fields of "Digital Transmission and Modulation Methods", "Multiple Access Methods", "Coding Methods", "Networking Technologies" etc. relating to Wireless LAN, Intelligent Transport Systems(ITS), Fixed and Mobile Satellite, Terrestrial Based Mobile, Terrestrial Microwave and Cable Communications. The following shows the main research topics that are currently going on in our laboratory.

1. Wireless LAN
Transmission techniques for Wireless LAN that can achieve higher transmission quality and higher throughput are studied. We are carrying out intensive studies on OFDM(Orthogonal Frequency Division Multiplex) methods as one of the promised modulation techniques for the Wireless LAN systems, and develop novel time and frequency synchronization methods under poor C/N, and multi-path fading, as well as novel compensation methods for performance degradation due to nonlinear amplifier and multi-path fading in Wireless LAN.

2. Intelligent Transport Systems
Roadside-vehicle and Inter-vehicle communication systems are studied for realizing ITS (Intelligent Transport Systems) that deals with various issues (ex. traffic congestion, accidents and environmental pollution) concerning transportation through the most advanced information and communication technologies.

3. Satellite Communication Systems
Novel modulation/demodulation methods, coding and multiple access methods for realizing Interactive Multimedia Satellite Communications Systems which allow the user to use ultra small aperture terminal with antenna diameter of around 30cm and Remote Medical Treatment Systems of using Mobile Satellite Systems are studied.

4. Mobile Communication Systems
Software radio techniques are studied, that are possible to cope with various transmission data rate and modulation methods flexibly by using single programmable MODEM developled owing to recent technologies of semiconductors.

5. Cable Communication Networks
Novel modulation/demodulation methods for ADSL (Asymmetric Digital Subscriber Line) link that can achieve higher quality and higher transmission date rate under limited transmission frequency bandwidth (ex. conventional telephone cables) are studied.

www-admin@elec.mie-u.ac.jp