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In recent years, mobile cranes have been larger, and enhancements of various safety devices and assist functions have also been demanded. In this paper, a hoist-rope channel of mobile crane has been explored as a new area for PLC application to achieve a high-speed communication between boom-tip and hook. The channel is a loop circuit formed by a rope and two sheaves, and its simple channel model...
In recent years, mobile cranes have been larger, and enhancements of various safety devices and assist functions have also been demanded. In this paper, an over-winding detection circuit, which has been used commonly in hydraulic cranes, has been proposed to used as a PLC channel to realize a high speed network infrastructure between cab and boom-tip. The throughput performances of two types of cranes,...
Simple and low-cost PLC will be required to play a role in the Internet-of-Things (IoT) market such as ubiquitous wireless sensor networks. From the viewpoints of temporal connectivity and obtaining high SNR and stable channels, inductive coupling techniques for the kHz band PLC have been proposed in this paper. The results of three feasibility studies using a photovoltaic power system installed in...
The conventional narrowband power-line communication (NB-PLC) is a two-wire system, that has injected its signal between wires using a capacitive coupler. When communicating between floors at a large-sized building, the signal has to travel over long-distances across a switchboard which supplies electricity to distribution boards. Moreover, the signal is attenuated not only at the switchboard but...
A new signal transmission system for Narrow-Band Power-Line Communications (NB-PLC) has been proposed as an alternative to the conventional system in order to solve the signal propagation loss problem. The conventional transmission system uses the Neutral and Live (N-L) conductors, while the N-PE system uses the Protective Earth (N-PE) conductor instead of L. The channel properties and Packet Reception...
AEE-PLC (Adaptive power control method to Electromagnetic Environment for the Power-Line Communication) system was proposed by the authors to achieve the maximum throughput performance without radiation. As its radiation detection method, two methods were also proposed. One was called Scan and Sum (SAS) method which detected the radiation of burst packets. Another was Periodic Packet Sound (PPS) method...
To realize an eco-house, a new direct current (DC) distribution system has received widespread attention. This paper has proposed countermeasures to fundamental problems which make difficult to achieve a high-speed PLC over the existing alternating current (AC) systems. To reduce the signal attenuation of the conventional low-voltage (LV) power-line cables made from vinyl insulator, it is recommended...
In this paper, a new signal transmission system for Narrow-Band Power-Line Communications (NB-PLC) has been proposed in order to solve problems of the conventional systems. The serious signal propagation loss was the problem for the differential-mode transmission system, which used the live and neutral conductors. Malfunction of the earth leakage circuit breaker was the problem for the common-mode...
A dual-mode transmission system which utilizes the differential and common modes has been proposed. To improve the channel capacity, a simple diversity, which selected the better transmission mode at a client PC side, was examined at laboratory rooms in a building. It was found that the amount of throughput improvement was 45% compared with the conventional single mode transmission of differential-mode...
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