Hitoshi Kubota

Network architecture for home energy management system

This paper describes a network architecture for home energy management system (HEMS). To realize HEMS, networked appliances with control/monitor capabilities and home network without new wiring are indispensable. However, appliances with no expansive functions and conventional power-line carrier communication deteriorated by its interference have made it difficult to built advanced HEMS. We propose network architecture to solve these problems. The network capability is divided to, minimum interface software embedded in appliance and a separated network adapter. This architecture gives appliances network-ready capabilities without increasing cost. Dispersed-tone power line communication (DTPLC) was also developed for no-new-wire network. DTPLC modem avoids narrow-band power line noise and co-exists with conventional narrow-band power line communication. Network adapter with DTPLC modem was implemented and the network architecture proved effective in the field evaluation of HEMS.

High frequency band dispersed-tone power line communication modem for networked appliances

Power line communication modem for appliances control/monitoring network was developed. In order to realize robust communication by reducing influence from noise and channel distortion, the power line communication modem employs dispersed-tone technology and utilizes high frequency band for data transmission. Dispersed-tone technology gives the modem compatibility with radio communication as well as immunity from noise and channel distortion of power line. Performance of communication was measured. And compatibility with radio communication was also assessed. The results showed that the power line communication modem proposed in this paper was well qualified as a communication device for the purpose, and was compatible with radio communication.

Practical Solutions for Constructing Ubiquitous Network for Building and home control system

This paper describes practical solutions for constructing a ubiquitous network in building and home control systems. A hybrid network, which consists of a low power ad-hoc wireless network and a power/pipe line communication network with high frequency band dispersed-tone method, is developed. We have constructed appliance control systems by utilizing the proposed hybrid network system and have installed them in an actual building and home to evaluate their reliability and capability. High reliability and capability of the network system have been confirmed through the field test.

Terrestrial Data Multiplex Broadcasting News Delivery System And its Terminal

The features of a service system and its user terminal developed to deliver the whole of the text of newspaper articles to subscribers are described. Using terrestrial data multiplex broadcasting, the service system enables one to to distribute information at low cost. The user terminal possesses both the portability and the stability of the transmission, and it is designed to be used easily even by people who are unaccustomed to electronic devices.