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The paper presents a novel short-range wireless sensor node architecture, based on Integral Pulse Frequency Modulator (IPFM) and Ultra-Wideband (UWB) pulse generator. Due to the lack of internal clock signal source and multi user implementation without application of a microprocessor, the architecture is simple and energy efficient. Multi-user coding is performed using delay elements, where each user...
With the rapid development of wireless networks new application domains are continuously proposed. One of these applications includes an underwater and underground sensor which relies on the properties of diminished RF performance to send the gathered information to a base station. Although many researchers deal with the theoretical background of the channel and propagation models, very few experimental...
Precise localization in wireless sensor networks depends on distributed algorithms running on a large number of wireless nodes with reduced energy, processing and memory resources. Prerequisite for the estimation of unique nodes locations is rigid network graph. To satisfy this prerequisite network graph needs to be well connected. On the other hand, execution of distributed algorithm in the graphs...
Long-term electrocardiographic (ECG) recordings can be beneficial for detection and diagnosis of heart diseases, in particular arrhythmias. A wireless multi-function biosensor that measures a potential difference between two proximal electrodes on the skin enables monitoring of vital functions, like heart rate, respiration and muscular activity. It can thus make long-term ECG measurements while users...
Ambient Assisted Living environments rely heavily on use of technology for providing its users with assistance or supervision in their Activities of Daily Living (ADLs). Thus, it is crucial to ensure that wireless sensor networks (WSN) have high reliability and availability in such systems. Performance of networks is measured by the packet delivery ratio, average end-to-end delay and power consumption...
Localization in Wireless Sensor Networks (WSNs) has been a challenging problem in the last decade. The most explored approaches for this purpose are based on multidimensional scaling (MDS) technique. The first algorithm that introduced MDS for nodes localization in sensor networks is well known as MDS-MAP. Since its appearance in 2003, many variations of MDS-MAP have been proposed in the literature...
This study utilizes a simple model for constructing sensor nodes — master controller combinations in the Internet of Things. The model combines hardware and software for embedded systems which measure a predefined set of parameters. The master controller manages several sensor nodes, collects data from them and provides data for clients. The paper introduces a proof-of-concept implementation based...
Contemporary rates of WiFi (802.11) adoption have turned the technology into an oftunderestimated source of potential security breaches. Even though the lay user base typically feels protected by employing basic encryption (first WEP, then WPA and currently WPA2), the truth is that it is trivially easy to perform a multitude of attacks on typical home and small business setups. This paper will cover...
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