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The IEEE 802.15.4a standard for wireless sensor networks is designed for highly accurate ranging with impulse radio Ultra Wideband (UWB) signals. The standard is designed for coherent and non-coherent (energy detector) receivers, thus the choice of complexity is left to the implementer. In this paper, the maximal operating distance is analyzed for ranging, using a coherent receiver and an energy detector...
Derivation of a formula to estimate the location of a receiver by using the received signal strengths is presented. The formula is derived for a one-dimensional system in which the receiver is placed between two transmitters. Lognormal channel with a known path loss exponent is assumed. The derivation is based on the maximum likelihood estimation. The performance of this technique is evaluated by...
Accurate ranging is one of the most promising applications of ultra wideband radio in sensor networks. Amongst variety of ranging methods, threshold-based ranging is a primitive, but robust technique suitable for battery-limited systems. This contribution reports the performance of two threshold-based ranging methods: leading edge detection and search back method. The evaluation utilized real-world...
Localization has many important applications in wireless sensor networks (WSNs). A variety of technologies, such as acoustic, infrared and UWB (ultra-wide band) media have been utilized for localization purposes. In this paper, we propose a holistic, bottom-up design of a UWB-based communication architecture and related protocols for localization in WSNs. A new UWB coding method, called U-BOTH (UWB...
The IEEE802.15.4a Task Group for wireless personal area networks (WPAN) is working on an ultra-wideband (UWB) radio standard for the indoor sensor network applications. In 4a Task Group, various modulation and signal sources are being proposed to find the sensor network solutions satisfied with low cost and low power consumption. Among of them, the non-coherent direct sequences (DS) chaotic system...
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