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.
Multi-dimensional Wireless sensor grids (WSG)s are deployed in complex environments to sense and collect data relating to multiple attributes (multi-dimensional data). Such networks present unique challenges to data dissemination, data storage of in-network information discovery. However, in order to fully exploit these networks for mission-critical applications, energy-efficient and scalable solutions...
Abnormal activity sensing has attracted increasing research attention in military surveillance, patient monitoring, and health care of children and elderly, etc. Researchers have exploited the characteristics of wireless signals to sense “keystrokes” and “human talks”, relieving the privacy invasion concern caused by mounting the surveillance cameras or wearing the smart devices. However, existing...
We build an ubiquitous abnormal activity detection system, namely NotiFi, for accurately detecting the abnormal activities on commercial off-the-shelf (COTS) IEEE 802.11 devices. In contrast to the traditional wearable sensor based and computer vision based systems which require additional sensors or enough lighting in line-of-sight (LoS) scenario, we proceed directly with abnormal activity characterization...
Most recently, activity localization and recognition has increasingly attracted significant attentions due to its broad range of applications to support smart devices. Pioneer systems based on WiFi signals usually require six to eight antennas to localize the activity while the commodity WiFi infrastructure does not meet this requirement. In addition, they also require the priori learning of wireless...
Multidimensional WSNs are deployed in complex environments to sense and collect data relating to multiple attributes (multi-dimensional data). An efficient information discovery for multi-dimensional WSNs deployed in mission-critical environments has become an essential research consideration. Timely and energy efficient information discovery is very important to maintain the QoS of such mission critical...
With the rapid development of internet of things (IoT) with various low-cost machine type communications (MTC) devices, intelligent wearable devices, vehicular sensors and environmental sensors etc, it's anticipated that trillions of wireless nodes in IoT with diversified applications and services may come to life in the fifth generation wireless communication system (5G). These devices, however,...
There are some common problems, such as low location accuracy and low sampling efficiency, existing in the present node localization algorithms that are based on Monte Carlo Localization (MCL) in mobile wireless sensor networks. To improve these issues, a Monte Carlo box localization algorithm based on RSSI(MCBBR) is proposed in this paper. In the algorithm, sampling box was constructed through RSSI...
Multidimensional WSNs are deployed in complex environments to sense and collect data relating to multiple attributes (multidimensional data). Such networks present unique challenges to data dissemination, data storage and in-network query processing (information discovery). In this paper, we investigate efficient strategies for information discovery in large-scale multidimensional WSNs and propose...
Wireless meter reading based on a combination of WIA wireless network technology and 4G wireless network technology is proposed. Data can be collected and transferred to the background processing center timely and accurate. The article describes WIA wireless network hardware design and software design process. Greatly saving cost of laying communication lines due to using the wireless communication...
In this paper we introduce a precise real-time 3D indoor localization concept using a combination of the MISAS (multilateral inverse synthetic aperture secondary radar) approach and particle filtering. The synthetic aperture approach is a promising locating technique with effective multipath suppression. However, the practical usage in real-time applications is limited by its huge computational load...
For body sensor networks (BSN) nodes, extending battery lifetime is one of the key problems. In this paper, we address the problems of designing battery-friendly packet transmission policies in order to maximize the lifetime of batteries for BSN nodes under certain delay and deadline constraints. We present local optimization scheme for slack time and evaluate it with respect to battery performance...
The development and realization of a portable wireless electroencephalogram (EEG) monitor has become feasible due to the recent active research activities in the area of Wireless Sensor Networks (WSN). In this paper, we propose an EEG monitor design based on a commercially available WSN device, Body Sensor Networks node (BSN node). The device utilizes Zigbee technology and operates on the TinyOS operating...
This paper presents a compact wireless sensor node for 3D motion sensing, which can be used in wearable computing research. The sensor node is based on a commercial orientation sensor module and a wireless communication module. To extend the lifetime of this motion sensor node in many wearable computing applications, a power management unit is designed and implemented, which consists of a micro controller...
Wireless grid is a wireless network based virtual system that consists of wireless-connected different types of electronic devices and computers. It has broad application prospects in e-learning, mobile e-business, modern healthcare, smart home, wireless sensor networks and disaster management. Wireless cloud is a natural extension of wireless grid. On the basis of a literature analysis, this paper...
Wireless sensor networks (WSN) are attractive for information gathering in large-scale data rich environments. Emerging WSN applications require dissemination of information to interested clients within the network requiring support for differing traffic patterns. Further, in-network query processing capabilities are required for autonomic information discovery. In this paper, we formulate the information...
The resource sharing of wireless sensor networks (WSNs) under the Internet environment is one of the key issues to be solved for the application of WSNs. It proposed a Web Services based sensor network architecture, which can enlarge the application domain and increase the scalability and maintenance of current solutions. In the scheme, users can conveniently access WSNs via web browser at anytime...
This paper presents a novel frequency synchronizator for orthogonal frequency division multiplexing (OFDM) systems over multipath fading channels. With the help of pilot chips and channel estimates in frequency domain, we can analyze the delay power spectrum (DPS) of multipath channels and estimate the integer carrier frequency offset (CFO). Furthermore, the pseudo noise (PN) pilot chips are proposed...
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.