Study of the ubiquitous sensor-network by the cable and radio fusion type high-speed powerline communication

传统的电力线通信（PLC）是在100伏的线路之间注入通信信号的通信方法，其中，该注入方法被称为正常模式注入。另一方面，所提出的注入方法是在100 V线路和大地之间进行的，并且被称为幻影模式注入。注入的体模模式信号从100 V线发射到空间。如果在一个像房间这样的封闭空间里铺设许多线路，就会产生一个微弱的电磁场，从而使无线电通信成为可能。在这种情况下执行的通信被称为“电缆和无线电融合型PLC”。本研究以融合式PLC为系统架构，应用于室内移动的目标的高精度定位。主要结果有以下两点。(1)利用弱电磁波的无线电通信技术：开发了两种模式信号的注入/提取电路和有效激励电力线天线所需的天线耦合器。此外，为了保持天线效率，建议采用PLC调制解调器的屏蔽AC软线。这些成果被申请为专利。（2）高精度定位技术：在假设家庭机器人导航的情况下，检验了通过可听频率DS-CDM的室内高精度定位及其精度。通过使用弱无线电波技术（1）来同步麦克风和扬声器，所提出的定位技术在房间中存在许多障碍物的环境下实现了几厘米的精度。这些结果被写在三篇论文中，在国际会议上发表，并作为邀请论文和指导论文发表。

The conventional power-line communication (PLC) is a communication method which injects the communication signals between the lines of 100 volts, where the injection method is called the normal-mode injection. On the other hand, the proposed injection method was done between the 100V line and the earth, and called the phantom-mode injection. The injected phantom-mode signals were emitted from the 100V line to space. If many lines are wired in a closed space like a room, a weak electric-magnetic field will be filled, so that radio communications become possible. The communication performed in such a situation is called "a cable and radio fusion type PLC". In this research, a system of the fusion type PLC that was applied to achieve the highly accurate localization of an indoor mobile object. The main results are the following two points.(1) Technology of Radio communication using the weak electro-magnetic wave :An injection/extraction circuit of both mode signals and an antenna coupler that was necessary to excite a power-line antenna efficiently were developed. Moreover, to maintain the antenna efficiency, it was proposed to adopt the shielded AC cord of the PLC modem. These results were applied for as a patent.(2)Technology of highly accurate localization :An indoor highly accurate localization by audible frequency DS-CDM and its accuracy were examined, where the navigation of the home robot was assumed. By using the technology (1) of weak Radio wave to synchronize the mike and speakers, the proposed localization technology achieved the accuracy of several cm under the environment where a lot of obstacles existed in a room.These results were written in three papers presented at international conferences, and published as an invited paper and a tutorial paper.