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We have developed a position detection system to identify the positions of rescue workers working in tunnels and/or passages in underground facilities using leaky coaxial cables (LCXs). Via LCX, this system sends 2.4 GHz band signals as references for targets and receives 1.2 GHz band signals from targets. With these signals, this system can determine the positions of multiple numbers of terminals...
Minimizing blind zones and providing stable wireless communications are serious concerns in setting up wireless LAN access systems along meandering passages in buildings and underground facilities. To solve the problem, we have developed a dual band long leaky coaxial cable for the 2.4 and 5 GHz bands. Experiments conducted with meandering cable configuration show that communications over distances...
In installing wireless LAN access systems for indoor use, problems that arise include blind areas and interference between radio waves transmitted by neighboring base stations. To solve these problems, leaky coaxial cables have attracted attention. Commercially available leaky coaxial cables for 2.4 GHz wireless LANs are not long enough for outdoor use. Therefore, We have developed a 300 m leaky coaxial...
In wireless LAN technology, access point selection at each station is a critical problem in order to obtain satisfactory throughputs. The current protocol for access point selection is based on the received signal strength, and a concentration of stations causes a degradation of the entire wireless network. In the present paper, we propose two access point selection algorithms for maximizing two types...
This paper presents a framework that adapts the conventional home electric appliances with the infrared remote controls (legacy appliances) to the emerging home network system (HNS). The proposed method extensively uses the concept of service-oriented architecture to improve programmable interoperability among multi-vendor appliances. We first prepare APIs that assist a PC to send infrared signals...
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