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Demands for indoor-localization or indoornavigation are increasing in many fields such as a marketing, shopping related industries, and anticrime application. At present, many types of technologies of indoor-localization or indoor-navigation are proposed. Some examples are those that use ultrasonic waves, Wi-Fi, or IR-UWB. In this paper, we focus on IR-UWB technology because of its great potential...
Body area network (BAN) has been attracting more and more attentions, especially since BAN standardization was formally started by IEEE 802 in 2008. By enabling reliable wireless connection within body area, BAN is expected to provide an efficient way to lower disease occurrence rate and reduce medical expenditure when combining with various vital signal sensors deployed on human body. In this paper,...
Wireless body area network (WBAN) solution is an emerging technology to resolve the small area connection issues around human body, especially for the medical applications. Based on the integrated superframe structure of IEEE 802.15.4, this paper proposes a modified medium access control (MAC) protocol for WBAN with focus on the simplicity, dependability and power efficiency. Considering the support...
This paper shows channel models on path loss and power delay profile for wireless body area networks. These models were derived from measured channel transfer functions by using a vector network analyzer. The path loss models were obtained for the frequency bands of 430, 611, 953, 2450 MHz, and UWB band. A power delay profile model was given only for the UWB band because typical symbol duration of...
IEEE 802.15.4 is a current major technology for low-rate low-power wireless networks. To study the applicability of IEEE 802.15.4 over a wireless body area network (WBAN), in this paper we evaluate its three different access schemes' performance through several metrics. Considering the coexistence of contention access period (CAP) and contention-free period (CFP), we also study the mutual influences...
A new major application of UWB is medical healthcare using advantages of low power spectrum density, high capacity of transmission and accurate ranging. As a core network of medical healthcare based on ICT, i.e. medical ICT, a body area network (BAN) has been researched and developed. BAN can provide a wide range of applications in primary for medical healthcare such as tele-metering vital sign, e...
IEEE 802.15.4 is a current major technology for low- rate low-power wireless personal area networks (WPANs). To study the reliability of its medium access control (MAC) function, in this paper we evaluate its packet dropping rate performance with focus on the reason to drop a packet. Considering the compatibility with the original protocol, when the access failure happens the packet isn't dropped...
A body area networks (BAN) can provide a wide range of applications in primary for medical healthcare such as telemetering vital sign, telecontrolling medical equipment, and in addition for non-medical service such as entertainment. To harmonize with the strong demands from both medical healthcare societies and ICT industries, a standardization committee referred to as IEEE 802.15.6 was formally set...
The distance between two asynchronous impulse ultra-wideband (UWB) sensors can be obtained from round trip flying time through two-way ranging (TWR) transaction. The clock difference causes error in the flying time measurement account for the order of 10 nanoseconds propagation delay. This paper presents a clock management between UWB sensors in the TWR transaction. The ranging responder estimates...
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