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In order to realize the high precision indoor positioning system, an embedded gateway is designed for data transmission and forwarding, and the server is developed on Windows platform for storing data, obtaining and showing location information. The indoor positioning system architecture is given, focusing on the design and implementation of gateway and server. ARM11 processor is used to design a...
A mobile robotic access point (AP) is proposed to provide better wireless network environment. This AP automatically searches and moves to the best position to provide enough radio power for all devices connected to the AP. We designed the mobile robotic AP and evaluate its performance in experiment. It was found that the proposed AP can increase radio power for all devices connected to the AP by...
This paper evaluates throughput characteristics of a multi-hop network, where a relay node itself has own traffic as well as relays transit traffic. In addition, it also has an individual per-flow scheduling such as weighted round-robin scheme to send transit and own data farther. The best route is determined in terms of various QoS criteria such as total throughput and relay node throughput. Novelty...
Extending battery life for smartphones while using wireless networks is important. In this paper, we propose Comfort Route for Energy Saving (CRFES), which helps users extend the battery life of their smartphones by navigating to their destinations via Quality of Service (QoS)-compliant energy-efficient spots such as Wi-Fi spots. To create CRFES, we construct maps of Wi-Fi spots using logging software...
GPS performs considerably well in the outdoor LoS conditions. However, its performance rapidly deteriorates when it is used in non-LoS indoor environments. This paper analyzes the performance of Wi-Fi based positioning in the outdoor environments. Our tests reveal that scene analysis can achieve high accuracies even in the outdoor setups. All observations reported in this work are based on experimental...
This paper proposes a platform for building an ad hoc network, using the Wi-Fi direct technology in a Delay-Tolerant Network (DTN) environment. In this platform, a multi-agent system is used for solving the device-to-device connection, and for improving the efficiency of communication. In order to evaluate the feasibility of the proposed platform, a prototype android application is developed and tested...
In home networks, a variety of smart devices are connected to a WiFi access point (AP) and the oversized buffer of the AP causes high latency/delay jitter and reduced network throughput (known as the bufferbloat problem). To mitigate this problem, appropriate active queue management (AQM) algorithms should be implemented at the AP. In this paper, we conduct extensive simulation study on the performance...
To show a computer screen on a large display, so far, wired cable connections like VGA, HDMI, and DisplayPort are mainly used. Recently, wireless display technology is becoming popular, especially on mobile devices like PCs, tablets, and smartphones. “Tap to Display” is a connection method triggered by an NFC tap operation. It enables users to show the desktop screen of his PC on the destination Miracast...
This paper describes a multi-purpose display and a timer developed for athletics. Traditional displays can be used for only one item of athletics, but this display can be used at long jump, throwing events, and combined events. In addition, these devices have the features of wireless communication, low cost, and easiness for users to handle. These have been already on sale and used at athletic games,...
Nowadays using smartphones is becoming common, which results in popularity of using short-range wireless communication: Bluetooth, Near Field Communication (NFC), and Wi-Fi Direct. However, we still have a problem to identify the communication partner relying on Media Access Control (MAC) addresses. To deal with this problem, we have been explored using accelerometers built into smartphones. In this...
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