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

常规电力线通信（PLC）是在100伏线路之间注入通信信号的通信方式，其中注入方式称为正模注入。另一方面，所提出的注入方法是在100V线和地之间进行的，称为幻模注入。注入的幻模信号从100V线发射到太空。如果在像房间这样的封闭空间内连接许多线路，就会充满微弱的电磁场，从而使无线电通信成为可能。在这种情况下进行的通信称为“电缆和无线电融合型PLC”。本研究采用融合型PLC系统实现室内移动物体的高精度定位。主要结果有以下两点。(1)利用弱电磁波的无线电通信技术：开发了有效激励电力线天线所必需的模式信号注入/提取电路和天线耦合器。此外，为了保持天线效率，提出采用PLC调制解调器的屏蔽交流电源线。这些结果被申请为专利。(2)高精度定位技术：在假设家用机器人导航的情况下，研究了一种基于频域DS-CDM的室内高精度定位方法及其精度。本文提出的定位技术利用(1)微弱无线电波同步麦克风和扬声器的技术，在室内存在大量障碍物的环境下，实现了几厘米的精度。这些结果在国际会议上发表了三篇论文，并作为特邀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.