The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Received signal strength indication (RSSI) is used in most cases of the localization system for its advantages of simplicity, requiring no additional hardware and low-cost. However, due to the irregular fluctuation, there are certain measured RSSIs which do not follow the empirical path loss model, while estimating the location of the blind node. So it's quite difficult to achieve high location accuracy...
Wireless visual sensor networks (WVSN) have been developed as a directional types of sensor network with different challenges such as optimization of energy consumption. These networks provide more information than the other types of wireless sensor networks. The goal of this paper is to optimize the tradeoff between the energy consumption and the quality of the received data. For realization of this...
There is an increasing demand for indoor navigation and localization systems along with increasing popularity of location based services in last years. The paper presents our work in progress for locating indoor objects based on signal fusion. The location is based on two signals: RSSI (Received Signal Strength Indication) and video camera. This paper presents a vision-based system for human detection...
The machine-to-machine (M2M) communication network is a promising concept to improve the user experience. The M2M communication enables two M2M devices in proximity of each other to establish a direct local link and bypass the base station. Machine-to-machine communication can be applied to various important fields, such as military applications, public safety, environmental monitoring, commercial...
The recognition of human motions based on wireless sensor network technology has several obvious advantages. Since traditional recognition technology adopts a single wireless link, it is effective to identify whether an individual stays in a certain area. However, the technology fails to effectively recognize high-level human motions such as falling and lying down, which is of great importance for...
This paper presents the recent research results about the development of a Observed Time Difference (OTD) based geolocation algorithm based on network trace data, for a real Universal Mobile Telecommunication System (UMTS) Network. The initial results have been published in [1], the current paper focus on increasing the sample convergence rate, and introducing a new filtering approach based on a moving...
This paper introduces extensions of a previously proposed range-dependent modified Gilbert model for generation of realistic error patterns. With the proposed extensions our model can be used to generate signal-to-noise ratio trends corresponding to the error patterns for infrastructure-to-vehicle communications. The model parameters are estimated based on realistic highway measurements using off-the-shelf...
There are two main issues which are currently under research in the localization field when mobile beacons (aka anchors or reference nodes) are used. The first issue represents a strategy to select the most efficient reference information from redundant data collected during the reconnaissance process. The second issue is a static path planning problem which represents an anchor placement approach...
The constrained capacity of wireless sensor nodes and harsh, unattended deploy environments make the data collected by sensor nodes usually unreliable. We have proposed a count-min sketch based anomaly detection scheme with the goal of detecting the anomaly data values in WSN. In this paper, we analyze the performance of the proposed scheme thoroughly. We show through experiments with real sensed...
Smartphone capabilities can significantly enhance mobile and context-aware applications that depend on location information. Whereas outdoor Location Based Services (LBS) are highly developed thanks to GPS, indoor LBS still demand a positioning technology that provides accurate location data. In this paper, an ultrasonic signal acquisition module for fine-grained indoor positioning of portable devices,...
In this paper, we apply learning techniques to predict link quality evolution in a WSN and take advantage of wireless links with the best possible quality to improve the packet delivery rate. We model this problem as a forecaster prediction game based on the advice of several experts. The forecaster learns on-line how to adjust its prediction to better fit the environment metric values. Simulations...
Heterogeneous wireless systems such as a combination of mobile broadband wireless access (MBWA) and wireless local area network (WLAN) are candidates to attain the large capacity in the next generation mobile communication systems. For capacity expansion, small cells of multiple wireless network are deployed densely in these systems. Because a number of the cells overlap, users must discover lots...
Brain-computer interface (BCI) users can control very complex applications such as multimedia players or even web browsers. Therefore, different biosignal acquisition systems are available to noninvasively measure the electrical activity of the brain, the electroencephalogram (EEG). To make BCIs more practical, hardware and software are nowadays designed more user centered and user friendly. In this...
Wireless Capsule Endoscopy (WCE) is progressively emerging as one of the most popular non-invasive imaging tools for gastrointestinal (GI) tract inspection. As a critical component of capsule endoscopic examination, physicians need to know the precise position of the endoscopic capsule in order to identify the position of intestinal disease. For the WCE, the position of the capsule is defined as the...
One serious challenge of wireless multi-hop ad hoc networks is frequent link and node failures due to lossy wireless channels and low-cost hardware. Failure detection plays an important role in network maintenance. In order to reduce communication overhead, local-based failure detection methods conduct diagnosis processes in a local area. However, the overhead of them is still very large because several...
This paper discusses the design and development of low-cost and longer battery life wireless pulse oximetry system. The design combined a low-power analog sensor circuit with a software DSP system and a low-power wireless transceiver. The FFT algorithm was used to process the filtered signals for accurate calculations of %SpO2 and beats per minute(bpm). The prototype device connected to a Windows...
Real-time location systems (RTLS) for persons and objects are gaining high interest for consumer and industrial applications. Information about position allows the creation of intelligent context, which enables a great variety of value-added or even new services. There is no one localization technology that fits all application scenarios. But the unique aspects of ultra-wide band (UWB) make it a very...
Activity recognition has been a research field of high interest over the last years, and it finds application in the medical domain, as well as personal healthcare monitoring during daily home- and sports-activities. With the aim of producing minimum discomfort while performing supervision of subjects, miniaturized networks of low-power wireless nodes are typically deployed on the body to gather and...
This paper proposes a novel joint time of arrival (TOA)/received signal strength indicator (RSSI)-based wireless capsule endoscope (WCE) location tracking method without prior knowledge of biological human tissues. Generally, TOA-based localization can achieve much higher localization accuracy than other radio frequency-based localization techniques, whereas wireless signals transmitted from a WCE...
Wireless electrocardiography (ECG) systems are crucial in detecting and diagnosing heart disorders. Minimizing power consumption and sampling-rate should be the key aspects when designing wireless ECG systems. In order to achieve portability coupled with ultra-low power consumption and sampling-rate, clustering and classification algorithms play an important role in developing wireless ECG systems...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.