A Study of Power-Line Communications for Realization of High-speed and High-reliable Home-Network

实现高速高可靠家庭网络的电力线通信研究

基本信息

批准号：
13650413
负责人：
TSUZUKI Shinji
金额：
$ 2.3万
依托单位：
EHIME UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

The demand for a home network is increasing in recent years, so that power-line communication (PLC) and wireless communications attract attention as newly wiring-less methods. The research and development of high-speed PLC of around 10Mbps using the high-frequency band under 30MHz have become active in Japan. However, since a network topology of a power line is complicated and its transfer function is influenced by the household-electric-appliances which are connected to the power-line, it has been supposed that an estimation method of the transfer function of power-line channel was not easy generally.In 2001, it was shown that the power-line channel must be treated as a distributed constant circuit at the high-frequency band. The distributed constants of a VVF (Vinyl insulation, Vinyl sheath, Flat) cable, which is widely used for the residential power-line in Japan, were obtained. Moreover an estimation method of the transfer function of branched power-line channel was developed. The … More channel was segmented at each branching point, and the segmented piece of the cable was modeled as a four terminal network represented by a transmission matrix. Its elements were determined by the distributed constants when the cable length was given.One of PLC's difficulties is the wiring scheme, which sometimes affects the signal-attenuation property and sometimes introduces an unnecessary radiation due to the electrical unbalance. These problems may occur, when power-line channels are branched, the length of two signaling-wires is different due to switch circuits, and the conventional layout of ground-wire for outlets with ground connecter is used. In 2002, new wiring schemes were proposed. It was shown that the schemes were effective in improving the transmission characteristic of the power-line -channels. Moreover, the scheme allowed us to make the phantom transmission available when 3-wires VVF cables were used. The phantom transmission made the power-line channel-capacity double. The new phantom transmission circuit was developed, and its effectiveness was shown experimentally. Less

近年来，家庭网络的需求不断增加，电力线通信(PLC)和无线通信作为新的无布线方式受到关注，利用高频的10Mbps左右的高速PLC的研究和开发。 30MHz以下的频段在日本已开始使用，但是，由于电力线的网络拓扑复杂，并且其传输函数受到连接到电力线的家用电器的影响，因此需要进行估计。的方法电力线通道的传递函数一般来说并不容易。2001年，人们发现电力线通道必须被视为高频段的分布常数电路，广泛用于电缆。此外，还开发了一种分支电力线信道传输函数的估计方法，在每个分支点对信道进行分段。电缆的一段被建模为由传输矩阵表示的四端网络，当电缆长度给定时，其元素由分布常数决定。PLC的困难之一是布线方案，它有时会影响信号衰减特性和特性。有时由于电气不平衡而引入不必要的辐射，当电源线通道分支、由于开关电路而导致两条信号线的长度不同以及接地插座的地线的常规布局时，可能会出现这些问题。使用连接器。 2002年，新的布线方案被提出，结果表明该方案可以有效改善电力线通道的传输特性，并且该方案使我们能够在使用3线VVF电缆时实现幻象传输。幻象传输使电力线信道容量增加了一倍，并通过实验证明了其有效性。