Development of the ubiquitous network by the cable and radio fusion type high-speed power-line communication

泛在网络的研究和开发得到了大力开展。本研究采用电力线通信（PLC）作为通信方式。虽然传统的PLC变送器在100V线路之间注入信号，称为正模注入，但提出的变送器在100V线路和地球之间注入信号，称为幻模注入。通过这两种注入方式，旨在实现信道容量的两倍提高。由于电力线电缆是为能量传输而设计的，注入的具有高频谱成分的信号不能被密封在电缆中，虽然信号对空间微弱，但仍会发射出去。然后电缆就像天线一样工作。如果在一个封闭的空间，如房间内部，将许多线路连接起来，就会充满一个微弱的电磁场，从而实现无线电通信。在这种情况下进行的通信称为“电缆和无线电融合型PLC”。利用PLC实现100Mbps左右的住宅泛在网络是本课题的研究目的。幻模电流主要对电力线的电磁场辐射有贡献。即使注入模式是正常的，根据电力线的电气不平衡程度，该模式也会部分转换为幻象模式。因此，实现电气不平衡度的精确测量是非常重要的。测量的不平衡会影响通道的建模。2003年研制了一种测量纵向转换损耗（LCL）的探头，用于测量不平衡。2004年对包含平衡度的通道建模技术进行了检验，并使用上述LCL探针进行了实验验证。利用该探头，可以方便地实现对幻模信号的注入/提取。

Research and development of ubiquitous networks have been done energetically. As the communication method, power-line communication (PLC) was used in this research. Although the conventional PLC transmitters inject signals between 100V lines, called the normal-mode injection, the proposed transmitters inject signals between a 100V line and the earth, called the phantom-mode injection. By using these two injection methods, the twice improvement of the channel capacity is aimed.Since the power-line cable has been designed for energy transmission, the injected signals with high spectrum components cannot be sealed in the cable, but the signals are emitted though feeble to space. Then the cable works as a kind of an antenna. If many lines are wired in a closed space like the interior of a room, a weak electric-magnetic field will be filled, so that radio communications can be realized. The communication performed in such a situation is called "a cable and radio fusion type PLC". It is the purpose of this research to realize the residential ubiquitous network about 100Mbps by PLC.Phantom-mode currents mainly contribute to the electromagnetic field radiation from power lines. Even if the injected mode was normal, the mode would be partly converted to the phantom mode depending on the degree of en electrical unbalance of the power-lines. Therefore it is very important to realize an accurate measurement of the degree of en electrical unbalance. The measured unbalance can affect the channel modeling.A probe for measuring LCL (Longitudinal Conversion Loss) which is the measure of the unbalance was developed in 2003. The channel modeling technique containing the degree of balance was examined in 2004, and it showed the validity experimentally using the above-mentioned LCL probe. By using this probe, the injection/extraction method of the phantom-mode signal could realize easily.