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For large-scale wireless sensor networks (WSNs) with a minority of anchor nodes, multi-hop localization is a popular scheme for determining the geographical positions of the normal nodes. However, in practice existing multi-hop localization methods suffer from various kinds of problems, such as poor adaptability to irregular topology, high computational complexity, low positioning accuracy, etc. To address these issues in this paper, we propose a novel Multi-hop Localization algorithm based on Grid‑Scanning (MLGS). First, the factors that influence the multi-hop distance estimation are studied and a more realistic multi-hop localization model is constructed. Then, the feasible regions of the normal nodes are determined according to the intersection of bounding square rings. Finally, a verifiably good approximation scheme based on grid-scanning is developed to estimate the coordinates of the normal nodes. Additionally, the positioning accuracy of the normal nodes can be improved through neighbors
Heart Rate Monitors (HRMs) have become widely used since the last two decades. It used as training aid for various types of sports. And the development of new HRMs has evolved rapidly. Thus, in order to determine the exercise intensity of training session or race, HRMs are mainly used. Compared to the other indication of exercise intensity, Heart rate is easy to monitor, compatible to use in most situation and relatively cheap. Thus, it is most beneficial if wireless sensor network can be implementing into the system. Other than monitored their condition by themselves, this system may allowed a number of athletes being monitored simultaneously. Arduino-Nano board was used to interface with nRF24AP1 and XBee. The wireless sensor network consists of a microcontroller on Arduino-Nano board, nRF24AP1 and the XBee wireless communication module which is based on the IEEE 802.15.4. This system will involve peer to peer communication of ANT+ and mesh networking among the XBee ...
Security in wireless sensor networks is difficult to achieve because of the resource limitations of the sensor nodes. We propose a trust-based decision framework for wireless sensor networks coupled with a non-deterministic routing protocol. Both provide a mechanism to effectively detect and confine common attacks, and, unlike previous approaches, allow bad reputation feedback to the network. This approach has been extensively simulated, obtaining good results, even for unrealistically complex attack scenarios.
An enhanced closed-loop power control method includes the steps of: setting an initial value of a power control variable; detecting a strength of a terminal signal and comparing the detected strength with a reference Eb/No; transmitting a power control signal to a terminal according to the comparison result and the set power control variable value; and analyzing the power control signal transmitted to the terminal for a predetermined reference time period and resetting a power control variable. When the subscriber does not move in an area with a favorable radio reception sensitivity (that is, in a state that the Eb/No is a little changed) the base station sets the power control step-size lower than the current step-size and performs a fine power control. Thus, a flux of the transmission power can be prevented. And, since the number of puncturings performed per unit time is reduced, the data transmission efficiency can be heightened.
Systems and methods for providing content-aware adaptation of multimedia communications in wireless networks to ensure Quality of Experience (QoE) of the content transmitted by the multimedia communications are generally disclosed herein. One example embodiment includes adaptive streaming optimization techniques, such as the exchanging of application-layer parameters used to establish network connectivity settings and implement an appropriate QoE for applications communicating within the wireless network. Example embodiments may also determine and implement Quality of Service (QoS) parameters for the wireless network and other connected networks based on the application-layer parameters. Such application-layer parameters may include receiver display capabilities and multimedia-specific parameters. These techniques may be used in connection with, for example, the transmission of real-time multimedia content, such as multimedia content communicated wirelessly from a computing device using a Wireless
Optimizing a plurality cell sites or sectors in a wireless network including receiving network data regarding a plurality of cell sites or sectors; determining a critical zone in which communication is degraded; determining best neighbor cell sites or sectors among the neighbor cell sites or sectors associated with the critical cell sites or sectors; determining if the critical cell sites or sectors in the critical zone have available resources for achieving a desired improvement in communications; determining if the best neighbor cell sites or sectors have available resources for achieving the desired improvement in communications; and altering wireless network parameters of the critical cell sites or sectors, or the best neighbor cells sites or sectors for achieving the desired improvement in communications. Altering wireless network parameters of the critical cell sites or sectors, or the best neighbor cell sites or sectors is performed continuously until the desired improvement in communications in
TechNavios Global M2M Wireless Network Services Market 2010-2014 report has been prepared based on an in-depth analysis of the market with inputs from industry experts. The report focuses on the Americas, the EMEA, and the APAC regions; it also covers the current market landscape and expected growth of the Global M2M Wireless Network Communication Services market. The report also includes a discussion on the major vendors that provide M2M wireless network communication services in this market ...
This paper develops a stochastic geometry-based approach for the modeling and analysis of single- and multi-cluster wireless networks. We first define finite homogeneous Poisson point processes to model the number and locations of the transmitters in a confined region as a single-cluster wireless network. We study the coverage probability for a reference receiver for two strategies; closest-selection, where the receiver is served by the closest transmitter among all transmitters, and uniform-selection, where the serving transmitter is selected randomly with uniform distribution. Second, using Matern cluster processes, we extend our model and analysis to multi-cluster wireless networks. Here, two types of receivers are modeled, namely, closed- and open-access receivers. Closed-access receivers are distributed around the cluster centers of the transmitters according to a symmetric normal distribution and can be served only by the transmitters of their corresponding clusters. Open-access receivers, on the
Wireless sensor networks have variety of applications in military and civilian tracking, habitat monitoring, patient monitoring and industrial control and automation. Many protocols have been...
A system and method for implementing a wireless sensor network. The system comprises a plurality of motes, each mote having a sensor and a wireless communication system for communicating with neighboring motes; a distributed routing table distributed amongst each of the plurality of motes; and an update system for periodically updating the distributed routing table.
A routing protocol of the Data Collection network based on Wireless Sensor Networks (WSN) routing algorithm is put forward in this essay. The Link Estimati
One of the major challenges in deployed wireless sensor networks (WSN) is to curb down congestion in networks traffic without compromising the energy consumption of the sensor nodes. Congestion disrupts the continuous flow of data, increases loss of information, delays data delivery to the destination and significantly and unnecessarily increases energy consumption in already energy-strapped nodes. Obviously, in healthcare WSN applications, particularly those that cater to medical emergencies or monitor patients in critical conditions, it is desirable to prevent congestion from occurring in the first place. In this work, the authors address the problem of congestion in the nodes of healthcare WSN using a learning automata (LA)-based approach. The primary objective is to adaptively equate the processing rate (data packet arrival rate) in the nodes to the transmitting rate (packet service rate), so that the occurrence of congestion in the nodes can be avoided.
Methods and apparatuses for position determination and other operations. In one embodiment of the present invention, a mobile station uses wireless signals from a plurality of wireless networks (e.g., with different air interfaces and/or operated by different service providers) for position determination (e.g., for data communication, for obtaining time and/or frequency information, for range measurement, for sector or altitude estimation). In one embodiment of the present invention, mobile stations are used to harvest statistical data about wireless access points (e.g., the locations of mobile stations that have received signals from the wireless access points, such as from cellular base stations, wireless local area network access points, repeaters for positioning signals, or other wireless communication transmitters) and to derive location information (e.g., position and coverage area of the wireless access points) for the wireless networks from the collected statistical data.
Wireless sensor networks are deployed for the purpose of sensing and monitoring an area of interest. Sensor measurements in sensor networks usually suffer
Wireless Sensor Networks will open the floodgates to the wireless revolution. But building a practical wireless network can be a daunting challenge unless the concepts are kept simple.
This paper models and analyzes the infrastructure communication reliability of wireless sensor networks (WSN) with tree topology. Reliability metrics are developed for WSN under five different data delivery models, including sink unicast, anycast, multicast, manycast, and broadcast. An example of WSN with tree topology is analyzed to illustrate the application of the proposed reliability metrics. Reliability results for the five data delivery models are compared and discussed.
This dissertation research proposes embedding artificial neural networks into wireless sensor networks in parallel and distributed processing framework to implant intelligence for in-network processing, wireless protocol or application support, and infusion of adaptation capabilities. The goal is to develop in-network "intelligent computation" and "adaptation" capability for wireless sensor networks to improve their functionality, utility and survival aspects. The characteristics of wireless sensor networks bring many challenges, such as the ultra large number of sensor nodes, complex dynamics of network operation, changing topology structure, and the most importantly, the limited resources including power, computation, storage, and communication capability. All these require the applications and protocols running on wireless sensor network to be not only energy-efficient, scalable and robust, but also "adapt" to changing environment or context, and application scope and focus among others, and ...
We developed a ubiquitous healthcare system consisted of aphysiological signal devices, a mobile system, a device provider system, a healthcare service provider system, a physician system, and a healthcare personal system. In this system, wireless body area network (WBAN) such as ZigBee is used to communicate between physiological signal devices and the mobile system. WBAN device needs a specific function for ubiquitous healthcare application. We propose a scanning algorithm, dynamic discovery and installation, reliable data transmission, device access control, and a healthcare profile for ubiquitous healthcare system.
Data aggregation is an essential operation to reduce energy consumption in large-scale wireless sensor networks (WSNs). A compromised node may forge an aggregation result and mislead base station into trusting a false reading. Efficient and secure aggregation scheme is critical in WSN applications due to the stringent resource constraints. In this paper, we propose a method to build up the representative-based aggregation tree in the WSNs such that the sensing data are aggregated along the route from the leaf cell to the root of the tree. In the cinema of large-scale and high-density sensor nodes, representative-based aggregation tree can reduce the data transmission overhead greatly by directed aggregation and cell-by-cell communications. It also provides security services including the integrity, freshness, and authentication, via detection mechanism in the cells.
Device, system, and method of resource allocation in a wireless network. Embodiments include optimal space-frequency architectures for very high peak rates in wireless systems. For example, an apparatus for wireless communication in a power-limited, very wideband system includes a wireless communication device having a media access controller (MAC) and a physical layer (PHY) that are adapted for a multiple-input-multiple-output (MIMO) orthogonal frequency-division multiple access (OFDMA) communication scheme; a plurality of antennas, operationally coupled to said device, to send and receive wireless communication signals according to the MIMO-OFDMA communication scheme; and a resource allocator, to allocate transmission resources of the device into desired MIMO channels optimized according to at least one of signal-to-noise ratio (SNR), bandwidth, number of users, and signal-to-noise-plus-interference ratio (SINR).
In wireless sensor network the most challenging task is to reduce energy consumption. Due to resource restricted sensor nodes, it is valu...
The global industrial wireless sensor network market size was valued at USD 3,282.2 million in 2018 and is expected to reach USD 8,669.8 million by 2025, growing at a CAGR of 15.2% from 2019 to 2025. IWSN is a network infrastructure that enables connectivity between sensor nodes and gateways without fiber cables
CiteSeerX - Scientific documents that cite the following paper: Robust positioning algorithms for distributed ad-hoc wireless sensor networks
In various wireless sensor network applications, it is of interest to monitor the perimeter of an area of interest. For example, one may need to check if there is a leakage of a dangerous substance. In this pa.... ...
Algorithms for Spatial Partitioning in Wireless Sensor Network: 10.4018/978-1-4666-4038-2.ch006: Recent interest in integrated electronic devices (sensors) that operate wirelessly creates a wide range of applications related to national security
|b|Problem statement:|/b| It has been always a challenging task for the researchers to incorporate information technology advancements in the medical profession. In order to guarantee a reliable network infrastructure that supports the employment of wireless technology and mobile devices, a hybrid infrastructure that integrates wireless networks with the traditional wired Local Area Networks (LANs) is needed. The wired network will provide the stability to the network, improve the overall performance of the hybrid network and provide an alternative to the mobile routes, hence increasing the degree of redundancy and reliability. In recent years, Wireless Mesh Networks (WMN) have become more popular than ever. WMN has advantage of robust fault tolerance. Even if some of the mesh nodes are incapable, there exist many other alternative nodes to serve relay. In addition, multi-hop of WMN can not only spread coverage but also save both cabling cost and human resource. Health care can drastically benefit by
The video stream transmission over wireless sensor networks is specially required to consider the Quality of Service (QoS), such as low p...
DIP: Density Inference Protocol for wireless sensor networks and its application to density-unbiased statistics. . Biblioteca virtual para leer y descargar libros, documentos, trabajos y tesis universitarias en PDF. Material universiario, documentación y tareas realizadas por universitarios en nuestra biblioteca. Para descargar gratis y para leer online.
Handbook of Research on Developments and Trends in Wireless Sensor Networks: From Principle to Practice Hai Jin Huazhong University of Science and Technology, China Wenbin Jiang Huazhong University of
Analysis of key aspects to manage Wireless Sensor Networks in Ambient Assisted Living environments Henar Martín, Ana M. Bernardos, Luca Bergesio, Paula Tarrío Data Processing Group (GPDS CEDITEC) ETSI
CiteSeerX - Scientific documents that cite the following paper: Modeling and worst-case dimensioning of cluster-tree wireless sensor networks
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A method for pricing wireless communications services on a wireless network is described. A selection of a plurality of priorities available for transmitting a wireless communication transaction on a wireless network is provided, wherein the priority to be selected corresponds to the speed and allowable delay by which the transaction is to be transmitted. Transactions of lower priority are temporarily discontinued in favor of higher priority transactions when network capacity reaches a predetermined level. An amount is charged for the wireless communication transaction at a price corresponding to the priority and duration to be selected.
While feeling honoured for being invited to write a paper dedicated to Prof. Yutaka Takahashi, I was enthusiastically wondering how to connect my current research on sensor networks to his excellent professional profile. The question or, better, the answer, was not simple. Considering, for instance, the field of Markov chains, as far as I know there are hardly works in literature that use this well-known modelling paradigm to represent the operational states of a sensor network. However, in a very recent work on time-driven sensor networks, I proposed the exponential randomization of the sense-and-transmit process, in order to avoid tight synchronization requirements while preserving good expectations in terms of lifetime and reconstruction quality. But$\ldots{}$oh, I said exponential, thats the connection! $\ldots{}$ So, specifically, in this paper a Markov chain is constructed to characterize the activity of a node in a time-driven sensor network based on stochastic (exponential) sampling. Since
UNIVERSIDAD CARLOS III DE MADRID Escuela Politécnica Superior - Leganés INGENIERÍA DE TELECOMUNICACIÓN PROYECTO FIN DE CARRERA Analysis of SoftToken: a Coordinated Medium Access Control (MAC) for IEEE
A practical wireless network solution for providing community broadband Internet access services are considered to be wireless mesh networks with delay-throughput tradeoff. This important aspect of ne
0080] A small sample of systems methods and apparatus that are described herein is as follows: [0081] A1. There is provided a portable encoded information reading (EIR) terminal for incorporation in a data collection system having a plurality of peer EIR terminals, said plurality of peer EIR terminal collectively forming a wireless network, said wireless network being an OSI layer 2 network, said wireless network comprising zero or more wireless access points, said wireless network further comprising zero or more portals, each portal routing MAC frames between said wireless network and at least one OSI layer 2 network, said EIR terminal comprising: a terminal module including a central processing unit (CPU), a memory, and an encoded information reading (EIR) device selected from the group consisting of a bar code reading device, an RFID reading device, and a card reading device, said EIR device configured to perform one of: outputting raw message data containing an encoded message, outputting ...
Over the past several years, federal agencies have rapidly adopted the use of wireless technologies for their information systems. In a 2005 report, GAO recommended that the Office of Management and Budget (OMB), in its role overseeing governmentwide information security, take several steps to help agencies better secure their wireless networks.
For the contradiction between the inherent uncertainty and strong fault-tolerance ability and robustness required in the system during the three-dimensional monitoring with wireless sensor networks,a probability-based K-coverage control approach for three-dimensional wireless sensor network,PKCCA,is proposed in this paper.The three-dimensional monitoring region is divided into a grid,and a greedy heuristic is used to determine the best placement of one sensor at a time until a preset upper limit on the number of sensors is reached,or K-coverage with probability T of the grid points is achieved.Comparing with the traditional random and uniform deployment,the simulation results indicate PKCCA uses less sensors to achieve the same coverage degree and detection precision or same sensors to reach higher coverage degree.The case of preferential coverage(preferential coverage degree and preferential monitoring precision) for sub-regions is also analyzed and simulated.
Have any query? ask our expert @ http://www.absolutereports.com/enquiry/pre-order-enquiry/10503854. List of Exhibit of Global Airfreight Forwarding Market 2017-2021. Exhibit 01: Global airfreight forwarding market landscape. Exhibit 02: Countries covered in different geographies. Exhibit 03: Service offerings. Exhibit 04: Airfreight forwarding process flow. Exhibit 05: Global trade: Freight composition (volume %). Exhibit 06: Recent investments in freight forwarders technology 2015-2016. Exhibit 07: Global airfreight forwarding market 2016-2021 (millions of tons). Exhibit 08: Five forces analysis. Exhibit 09: Global airfreight forwarding market by service segmentation. And Continue…. Get Discount on Airfreight Forwarding Market Research Report at: http://www.absolutereports.com/enquiry/request-discount/10503854. About Absolute Report:. Absolute Reports is an upscale platform to help key personnel in the business world in strategizing and taking visionary decisions based on facts and figures ...
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Wireless Networks for Vehicular Support: 10.4018/978-1-60566-026-4.ch661: Vehicular Ad hoc NETworks (VANETs) is an area under intensive research that promises to improve security on the road by developing an intelligent transport
A wireless communication control method of the present disclosure is a wireless communication control method controlling communication between a first wireless communication apparatus, and a first ext
Enhanced living environments employ information and communications technologies to support true ambient assisted living for adults and people with disabilities. This book provides an overview of today's architectures, techniques, protocols, components, and cloud-based solutions related to ambient assisted living and enhanced living environments. Topics covered include: an introduction to enhanced living environments; pervasive sensing for social connectedness; ethics in information and communication technologies; service scenarios in smart personal environments; technological support to stress level monitoring; big data systems to improve healthcare information searching over the Internet; sensors for wireless body area networks; linear wireless sensor networks and protocols in next generation networks; model-compilation challenges for cyber-physical systems; health monitoring using wireless body area networks; wearable health care; and intelligent systems for after-stroke home rehabilitation.
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Location: ITC 1211, Time: 13:15. Abstract: The progress made in the field of Internet of Things (IoT) and Wireless Sensor Networks (WSN) are leading into the more comprehensive and integrated organization of the Cyber Physical Systems (CPS). Both the Cloud and Fog (or Edge-computing) plays important role in extending the capability of wireless sensor networks. This, in effect, enables the virtualization and support intelligence around the various services that the wireless sensor network can offer. Ultimately the goal of transparent coordination between the virtual and physical organizations could be achieved through the two ways communication between the cloud and the WSN using the IoT (or the Internet) connectivity. Timing and synchronization among the system components are of vital importance in coordinating the controlled actions with the events of a highly complex and distributed system. The field is directly associated with wide range of applications such as transportation, farming, ...
Embodiments include a wireless mote network having a plurality of motes, wherein each of the plurality of motes includes a processing unit in communication with a communications device. Each of the motes includes at least a sensor configured to monitor an environmental condition in an area around the mote or an actuator configured to control one or more external systems. The wireless mote network also includes a central communications device configured to communicate with one or more of the motes within a range of the central communications device and a controller configured to communicate with the central communications device, to receive one or more signals indicative of the environmental condition of one or more of the plurality of motes, and to transmit one or more control signals indicating an operation of the actuator to one or more of the plurality of motes.
The present invention presents an architecture to dynamically measure and estimate the throughput perceived by a user during a connection in real-time in a wireless network system. The architecture system design of the present invention allows for information gathering independent of the mathematical models used and takes into account security settings in the network hosts. The present invention also sets forth a number of throughput estimators (TEs) that can be used within the architecture to gather the information needed to carry out the throughput estimation calculations. The throughput estimations can then be used for download rate control, QoS, load balancing, etc. The present invention also provides algorithms to calculate the real-time throughput experienced by a user flow.
In a major technology development for the mobile industry, Ooredoo has collaborated with CommScope to develop a new approach to building wireless networks, which will improve installation quality and on-going network performance and reduce deployment times, in an alliance that could have major benefits for operators around the world. The two companies have developed what is believed to be the worlds first factory-assembled tower tops for base station remote radios, which are pre-assembled according to a single global design standard. The aim of the tower top development is to create and maintain a future-ready network that is radio vendor agnostic, and does not require significant on-site remote radio modifications for future upgrades. It has become increasingly complex, time-consuming and expensive for operators to maintain existing cellular sites. Typically, the infrastructure had to be assembled on-site at the top of the tower, and the lack of a single tower top design standard has made each ...
Methods and systems are provided for use with wireless networks having one or more cell in which each cell includes a base station (BS), at least one relay station (RS) and at least one mobile station (MS). The at least one relay station can be used as an intermediate station for providing communication between the BS and MS. Methods are provided for allocating OFDM resources for communicating between the BS, RS and/or MS for example dividing transmission resources into uplink and downlink transmissions and methods of inserting pilot symbols into transmission resources used by the RS. In some embodiments on the invention, the methods are consistent and/or can be used in conjunction with existing standards such as 802.16e.
An access protocol and method for a common channel wireless network addresses the functions needed in large scale wireless local or premises area networks where the user stations are or may include ba
An increasing number of computer users setting up Wi-Fi in their homes are reportedly sending out messages to annoying neighbors via their wireless network names. The creation of the Internet has meant that the options are now vast for those people whod rather not use their vocal cords to communicate with another person, preferring instead to engage in more indirect methods of communication - they can, for example, send an email, an instant message, an SMS, or a text. Communicating through the name of your wireless network can also be added to the list, a method which is a fast-growing trend, according to a BBC report on the subject.. When someone sets up a wireless network at home, theyre prompted to give it a name so it can be easily identified. That name will be seen by anyone within range who searches for a wireless network using a computer or mobile device.. In most cases, these names are nothing out of the ordinary, something like "Bob1" or "mycomputer123". However, recently more and ...
A technique for dynamically responding to threats in a wireless network involves deploying a single network including APs capable of booting from a plurality of software images. Individual APs can switch (or be switched) between multiple sets of software so that network managers can select the AP software most appropriate for a given instance. For example, if a threat is detected, multiple APs can be switched to sensor mode to deal with the threat. As another example, all of the APs can be switched to sensor mode after hours. Alternatively, a server can provide the software image(s) needed for an AP to operate in accordance with a desired functionality.
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This book provides a novel solution for existing challenges in wireless body sensor networks (WBAN) such as network lifetime, fault tolerant approaches, reliability, security, and privacy. The contributors first discuss emerging trends of WBAN in the present health care system.
AN IMPLEMENTATION OF A WIRELESS BODY AREA NETWOFW FOR AMBULATORY HEALTH MONITORING , AN IMPLEMENTATION OF A WIRELESS BODY AREA NETWOFW FOR AMBULATORY HEALTH MONITORING , کتابخانه دیجیتال دانشگاه آزاد اسلامی خوراسگان
A system and method for routing in a wireless mesh network providing a first device, which includes a first device transceiver, a first device memory unit that includes a first device first queue, a first device second queue and a first device table of neighboring devices, and a first device central processing unit. Such a system also includes a second device that includes a second device transceiver, a second device memory unit that includes a second device first queue, a second device second queue and a second device table of neighboring devices, and a second device central processing unit.
David Gulbransen illustrates how XML penetrates just about everywhere in the Internet. However, the triumph of XML has continued even after that-to wireless technologies.
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Considering the environmental protection, forest fire becomes a more and more serious problem and requires more concerns. This paper provides an efficient method for fire monitoring and detection in forests using wireless sensor network technology. The proposed technique estimates the location of a sensor node based on the current set of hop-count values, which are collected through the anchor nodes broadcast. Our algorithm incorporates two salient features; grid-based output and event-triggering mechanism, to improve the accuracy while reducing the power consumption. Through the computer simulation, the output region obtained from our algorithm can always cover the target node. In addition, the algorithm was implemented and tested with a set of Crossbow sensors. Experimental results demonstrated the high feasibility and worked well in real environment.
IEEE Wireless Communications Magazine, Vol. Information Forensics and Security, Vol. Ad-hoc Networks, IEEE Communications seconds and services, Vol. Network and Computer Applications, Vol. Network Security, IEEE Internet Computing, Vol. Intelligent Transportation Systems, Vol. Natural Ecosystems, Journal of Mobile Information Systems, Vol. Technical Overview and Challenges, Journal of Networks, Vol. Data and Information Quality, Vol. 8221;, IEEE Internet Computing, Vol. An International Journal, Vol. 8221;, IEEE Network Magazine, Vol. Journal of Network and Computer Applications, Vol. 8221;, IEEE Wireless Communications Magazine, Vol. IEEE Internet of times Journal, Vol. IEEE Communications Magazine, Vol. Named Data Networking( NDN), IEEE Internet of styles Journal, Vol. Springer Wireless Networks, Vol. Ad Hoc Networks Journal, Vol. Journal of Homeland Security and Emergency Management, Vol. Ad Hoc Networks Journal, Vol. 8221;, Computer Journal, Vol. 8221;, ACM Computing is, Vol. Journal of Systems
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132 [65] D Johns and K Martin, Analog Integrated Circuit Design, John Wiley & Sons, Inc., 1996. [66] R. J. Baker, CMOS Circuit Design Layout and Simulation. New York: IEEE Press, 2007. [67] Z. Li and K.K.O, 15 GHz f ully i ntegrated nMOS switches in a 0.13 m CMOS p rocess, IEEE J. Solid State Circuits vol. 40, no.11, pp.23232328, Nov 2005. [68] T. Le, K. Mayaram, and T. Fiez, Efficient f ar f ield r adio f requency e nergy h arvesting for p ass ively p owered sensor n etworks, IEEE J. Solid State Circuits vol. 43, no.5, pp.12871302, May. 2008. [69] B. Razavi, Fundamentals of Microelectronics John Wiley & Sons, Inc., 2006. [70] B.W. Cook, A. Berny, A. Molnar, S. Lanzisera and K.S.J. Pister, Low p ower 2.4 GHz t ransceiver with p assive RX front end and 400mV supply, IEEE J. Solid State Circuits vol. 41, no.12, pp.2757 2766, Dec 2006. [71] S. Zhou and M.F. Chang, A CMOS p assive m ixer with l ow f lickner n oise for l ow p ower d irect conversion r eceiver, IEEE J. Soli d State Circuits vol. 40, ...
Recent years have seen the rapid development of biosensor technology, system-on-chip design and wireless technology and ubiquitous computing. When assembled into an&..
An electrosurgical generator has an output power control system that causes the impedance of tissue to rise and fall in a cyclic pattern until the tissue is desiccated. The advantage of the power control system is that thermal spread and charring are reduced. In addition, the power control system offers improved performance for electrosurgical vessel sealing and tissue welding. The output power is applied cyclically by a control system with tissue impedance feedback. The impedance of the tissue follows the cyclic pattern of the output power several times, depending on the state of the tissue, until the tissue becomes filly desiccated. High power is applied to cause the tissue to reach a high impedance, and then the power is reduced to allow the impedance to fall. Thermal energy is allowed to dissipate during the low power cycle. The control system is adaptive to tissue in the sense that output power is modulated in response to the impedance of the tissue.
As you can understand, in areas of public health we rely on the guidance and direction established by experts in the field. In this case, Health Canada, the World Health Organization, and provincial health authorities have all concluded that the use of wireless technology does not pose a public health risk.. Most recently, Ontarios Chief Medical Officer of Health, Dr. Arlene King, and the Ontario Agency for Health Protection and Promotion have confirmed the safety of this technology. A presentation by Dr. Rosana Pellizzari, Medical Officer of Health, Peterborough County-City Health Unit, was shared with our CIO last week which further endorses the safety of wireless networks within public institutions. As well, the CIO association of Canada will be hosting an online E-seminar on Wifi Safety with Public Health experts later this month.. ...
Wireless sensor network (WSN) is a network of spatially distributed sensors communicating each other. They are transmitting their data to central node i.e. sink. For any network it should be reliable and energy efficient in nature. In multi-hop communication data flows through several hops but 100% data is not transmitted to sink. Sometime the data rate is also high. Traffic load in multi-hop wireless sensor network is not distributed uniformly over the nodes so there are more chances of data loss. To prevent this loss a necessary actions should be taken. In loss recovery algorithm caching method is used to recover from loss of packets and to improve reliability of network.. ...
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Media Access Control is the set of mechanisms and protocols through which various devices on a computing and telecommunications network agree to share a media.
0035]FIG. 4 is a block diagram of an example network operating environment 400 for location aware device 102 of FIG. 1. In FIG. 4, location aware devices 402a and 402b each can represent location aware device 102. Devices 402a and 402b can, for example, communicate over one or more wired and/or wireless networks 410 in data communication. For example, wireless network 412, e.g., a cellular network, can communicate with wide area network (WAN) 414, such as the Internet, by use of gateway 416. Likewise, access device 418, such as an 802.11g wireless access device, can provide communication access to wide area network 414. In some implementations, both voice and data communications can be established over wireless network 412 and access device 418. For example, device 402a can place and receive phone calls (e.g., using VoIP protocols), send and receive e-mail messages (e.g., using POP3 protocol), and retrieve electronic documents and/or streams, such as web pages, photographs, and videos, over ...
Xu Xing,Cai Kun,Wang Zhenjie. Wireless Sensor network (WSN) has great advantage of monitoring agriculture environment, but there is difference propagation characteristic in various agriculture productions such as radio propagation path, landform, and climate. Recent researches are usually limited in specific environment, so the wireless channel model that give sufficient consideration to various propagation circumstance need to be studied to improve wireless signal transmission efficiency. In this paper, CC2530 and CC1110 were selected to measure the propagation characteristic of 2.4GHz and 433MHz frequency. The Two WSN nodes were deployed in the citrus orchard, and the Receiver Signal Strength Index (RSSI) results are recorded under the different measurement circumstance including LOS and NLOS propagation path, flat and slope, sunny day and rainy day. The new path loss combination model is proposed through traditional path loss model and rain attenuation model. Comparing the measured data, the ...
NEW YORK, July 25, 2016 /PRNewswire/ -- Updates on Wireless Communications Industry Stocks -- NII Holdings, CalAmp, Ubiquiti Networks, and Telephone and...
Adaptive Rectifier Driven by Power Intake Predictors for Wind Energy Harvesting Sensor Networks - Porcarelli, D. ; Spenza, Dora ; Brunelli, D. ; Cammarano, Alessandro ; Petrioli, Chiara ; Benini, L. - This paper presents a power management technique for improving the efficiency of harvesting energy from air-flows in wireless sensor networks (WSNs) applications. The proposed architecture consists of a two-stage energy conversion circuit: an AC-DC converter followed by a DC-DC buck-boost regulator with Maximum Power Point Tracking (MPPT) capability. The key feature of the proposed solution is the adaptive hybrid voltage rectifier, which exploits both passive and active topologies combined with power prediction algorithms. The adaptive converter significantly outperforms other solutions, increasing the efficiency between 10% and 30% with respect to the only-passive and the only-active topologies. To assess the performance of this approach in a real-life scenario, air-flow data have been collected by
WiFi enabled LTE small cell gateway is a type of a base station. Base station uses cellular wireless network for communicating with mobile phones or terminals. Base station connects mobile phones to a wireless carrier network and offers local coverage for a wireless network. The area of coverage varies from several miles to few city blocks. Each base station is typically owned by one carrier or wireless company and gives coverage only for that companys network. It may also offer roaming coverage for other networks in case carriers have agreement for roaming and technology is compatible. Base station comprises of an electronic cabinet which connected by means of cables to a group of antennas. The antennas may be mounted on an existing structure or on dedicated tower structure including top of a building, church steeple or smoke-stack and water tower.. In radio communications, base station refers to wireless communications station implemented at a fixed location and used to communicate as ...
EURASIP Journal on Wireless Communications and Networking is a peer-reviewed open access journal published under the brand SpringerOpen. The overall aim of the ...
A system (300) and mobile wireless radio security method (500) can include a transceiver (320) and a processor (302) coupled to the transceiver. The processor can be programmed to monitor (502) for abnormalities or rare activities from a mobile wireless device when attempting a transmission and to suppress (516) the transmission when an abnormality or rare activity is detected at the mobile wireless device (12). The processor can further be programmed to monitor (504) a rate of speed of the mobile wireless device and suppress transmissions when the speed of the mobile wireless device exceeds a predetermined speed. The processor can be programmed to monitor (506) emails or messages to address book or phone book entries that are rarely contacted individually or as a group and programmed to suppress transmissions of such emails or messages until a user manually confirms the transmissions
Seventy percent of the Earths surface is covered by water and all living things are dependent upon this resource. As such there are many applications for monitoring environmental data in and around aquatic environments. Wireless sensor networks are poised to revolutionise this process as the reduction in size and power consumption of electronics are opening up many new possibilities for these networks. Aquatic sensor nodes are usually battery powered, so as sensor networks increase in number and size, replacement of depleted batteries becomes time consuming, wasteful and in some cases unfeasible. Additionally, a battery that is large enough to last the life of a sensor node would dominate the overall size of the node, and thus would not be very attractive or practical. As a result, there is a clear need to explore novel alternatives to power sensor nodes/networks, as existing battery technology hinders the widespread deployment of these networks. By harvesting energy from their local ...
In this paper, we study the problem of decomposing the end-to-end delay into the per-hop delay for each packet, in multi-hop wireless ad hoc networks. Knowledge on the per-hop per-packet delay can greatly improve the network visibility and facilitate network measurement and management. We propose Domo, a passive, lightweight, and accurate delay tomography approach to decomposing the packet end-to-end delay into each hop. We first formulate the per packet delay tomography problem into a set of optimization problems by carefully considering the constraints among various timing quantities. At the network side, Domo attaches a small overhead to each packet for constructing constraints of the optimization problems. By solving these optimization problems by semi-definite relaxation at the PC side, Domo is able to estimate the per-hop delays with high accuracy as well as give a upper bound and lower bound for each unknown per-hop delay. We implement Domo and evaluate its performance extensively using ...
The lifetime of a wireless sensor network (WSN) is limited by the lifetime of the individual sensor nodes. A promising technique to extend the lifetime of the nodes is wireless energy transfer. The WSN lifetime can also be extended by exploiting the redundancy in the nodes deployment, which allows the implementation of duty-cycling mechanisms. In this paper, the joint problem of optimal sensor node deployment and WET scheduling is investigated. Such a problem is formulated as an integer optimization whose solution is challenging due to the binary decision variables and non-linear constraints. To solve the problem, an approach based on two steps is proposed. First, the necessary condition for which the WSN is immortal is established. Based on this result, an algorithm to solve the node deployment problem is developed. Then, the optimal WET scheduling is given by a scheduling algorithm. The WSN is shown to be immortal from a networking point of view, given the optimal deployment and WET ...
Vancouver, British Columbia--(Newsfile Corp. - February 11, 2019) - Edgewater Wireless Systems Inc. (TSXV: YFI) (OTCQB: KPIFF), the industry leader in innovative WiFi Multi-Channel Single Radio technology, has been issued a patent by the United States Patent and Trademark Office for its Automatic Gain
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Journal of Sensors is a peer-reviewed, Open Access journal that publishes original research and review articles related to all aspects of sensors, from their theory and design, to the applications of complete sensing devices.
In wireless networks, there is an increasing demand for higher user and system throughput, along with growing expectation for all mobile stations (MSs) in a cell to be capable of supporting data-heavy multimedia and Internet services. This is especially difficult to maintain at the cell-edge, where received signal and service clearly deteriorate. Furthermore, the necessity for more energy efficient, or "green," technologies is growing. With base stations (BSs) requiring up to 1.5 kW, a typical wide area network can consume tens of MW per annum [1]. In the uplink, while MSs do not consume nearly as much power, there are orders of magnitude more MSs then BSs in the network [2]. In addition with traffic loads increasing approximately ten times every 5 years, a doubling of the energy consumption results over the same time period. Clearly, such an increase raises serious environmental concerns. Consequently, smaller cell sizes, femto-cell deployment, relays [3, 4] and especially inter-cell ...
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A St. Louis hospital is testing a sensor network that allows vital signs to be tracked even as patients move about. By Diana Lutz, Washington University in St. Louis. A clinical warning system that uses wireless sensors to track the vital signs of at-risk patients is undergoing a feasibility study at Barnes-Jewish Hospital in St. Louis.. When the full system is operational sensors will take blood oxygenation and heart-rate readings from at-risk patients once or twice a minute. The data will be transmitted to a base station, where they will be combined with other data in the patients electronic medical record, such as lab test results.. The incoming vital signs and data in the medical record will be continually scrutinized by a machine-learning algorithm looking for signs of clinical deterioration. If any such signs are found, the system will call a nurse on a cell phone, alerting the nurse to check on the patient.. The idea is to create a virtual intensive care unit (ICU) where the patients ...
The full text of this Article may be found by clicking the PDF link below.. On May 26, 2015 the Supreme Court decided Commil USA, LLC v. Cisco Systems, Inc. Commil USA, LLC, owned a patent, number 6,430,395, for a method of implementing short-range wireless networks. The invention is used, for example, in a wireless system like a mobile device such as a phone and laptop computers. The device communicates with fixed "base stations" according to standardized procedures that govern how data exchanged between devices is formatted, ordered, maintained, and transmitted in a procedure referred to as "protocols." Effective wireless communication requires that both the transmitting and receiving devices follow the same protocol. The court describes the relationship between the wireless communication and the patent as:. The ′395 patent relates to a method of providing faster and more reliable handoffs of mobile devices from one base station to another as a mobile device moves throughout a network area. ...