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In distributed detection for wireless sensor networks, multiple access schemes and channel conditions affect the performance of data fusion at a fusion center together with communication constraints (bandwidth and transmission energy). For an efficient channel use, the type-based multiple access (TBMA) has been proposed by Mergen et al. Since the performance of TBMA is not satisfactory for zero-mean...
In this paper, serial distributed detection under node failure for wireless sensor networks is studied. All previously suggested distributed detection algorithms for wireless sensor networks assume sensor nodes are completely functional. However, sensor nodes are vulnerable to failure for variety of reasons. Hence, node failure tolerant algorithm design is crucial to provide robustness to system under...
In wireless sensor networks where nodes are powered by batteries, it is critical to prolong the network lifetime by minimizing the energy consumption of each node. In this paper, the cooperative multi-input-multi-output (MIMO) and data aggregation techniques are jointly adopted to improve energy efficiency in a cluster based wireless sensor network. Using the energy model derived, the average energy...
Wireless sensor networks may be utilized for various application areas such as health, military, home, and so on. In the wireless sensor networks, data transmission typically relies on multi-hop communication with high packet loss rates on wireless links so that reliable end-to-end data transmission is desirable. Recently, in order to achieve desired Communication Reliability (CR) levels of the various...
For multicast applications with large-scale groups in large-scale wireless sensor networks, it is an important issue for energy saving in geographic multicasting both to obtain location information of destination nodes and to construct the geographic multicast tree efficiently. To address this issue, there have been proposed global search based hierarchical geographic multicasting protocols. Such...
This paper describes a medical IT platform based on Wireless Sensor Networks and e-textile which supports indoor location-aware services as well as monitoring physiological parameters, such as ECG, heart rate, body temperature, etc., from a group of patients within hospital facilities. The paper presents the architecture, system deployment and validation results based on local test as well as on a...
We study the physical layer design of a distributed time-division multiple access (TDMA) protocol for wireless body area networks (WBAN). The distributed TDMA scheme is derived from a bio-inspired algorithm known as Pulse-Coupled Oscillator (PCO), in which each node in the network updates its state based on its knowledge of the neighborhood. ON-OFF ultra wide band (UWB) modulation is used by the sensors...
Future pervasive communication systems requirements for highly performing, flexibly deployable and cost/energy-efficient services and applications are expected to revolutionize the way we design, optimize and use wireless networks. From a cellular perspective, the emphasis is placed on achieving ubiquitous and reliable real-time data communications at cell-edge, as articulated in ITU's IMT-Advanced...
This works illustrates the LAURA system, which performs localization, tracking and monitoring of patients hosted at nursing institutes by exploiting a wireless sensor network based on the IEEE 801.15.4 (Zigbee) standard. We focus on the indoor personal localization module, which leverages a method based on received signal strength measurements, together with a particle filter to perform tracking of...
Cooperative positioning is an emerging topic in wireless sensor networks and navigation. It can improve the positioning accuracy and coverage in GPS-challenged conditions such as inside tunnels, in urban canyons, and indoors. Different algorithms have been proposed relying on iteratively exchanging and updating positional information. For the purpose of computational complexity, network traffic, and...
RSS-based localization is considered a low-complexity algorithm with respect to other range techniques such as TOA or AOA. The accuracy of RSS methods depends on the suitability of the propagation models used for the actual propagation conditions. In indoor environments, in particular, it is very difficult to obtain a good propagation model. For that reason, we present a cooperative location algorithm...
Wireless location refers to obtaining the position information of a mobile subscriber in a cellular environment. Such positioning information is usually provided in terms of geographic coordinates of the mobile subscriber with respect to a geographic reference point. Wireless location finding has emerged as an essential feature of cellular systems and has many potential applications in areas such...
Indoor Wireless sensor networks require a highly dynamic, adaptive routing scheme to deal with the high rate of topology changes due to fading of indoor wireless channels. Besides that, energy consumption rate needs to be consistently distributed among sensor nodes and efficient utilization of battery power is essential. If only the link reliability metric is considered in the routing scheme, it may...
Wireless actuators are small scale devices that can receive/accept instructions and act on their environment. The IP Multimedia Subsystem (IMS) is a key component for 3G networks. It aims at seamless provisioning of multimedia services. Combining actuation capabilities with IMS capabilities will certainly enable novel value added services. This paper proposes an architecture for the integration of...
Previous work predominantly assumes that the pdf of range measurements exhibit Gaussian characteristics. The objective of this paper is to scrutinize this assumption for different environments. Experiments are performed in both outdoor and indoor environments with Line-of-Sight (LOS) and Non-Line-of-Sight (NLOS) conditions using IEEE 802.15.4 compliant devices. These devices consist of a low-cost...
This paper deals with the effect of mesh and cluster-tree topologies (that are defined in 802.15.4/Zigbee or 802.15.4a standards) in the performance of cooperative and range-based localization algorithms. In this type of localization at least three reference or anchor nodes within range are needed for location estimation (two dimensions). Therefore the successful localization depends on the connectivity...
In this paper indoor wireless Infrared (IR) technology for healthcare monitoring is studied. Monitoring provides a continuous and reliable vital sign measurement to secure patient staying in the hospital. Considering that patient moving is inevitable, we focus on a mobile IR channel based on diffuse propagation. A model of mobile channel is developed through the study of statistical distributions...
Dense monitoring of time-varying 2D field by Wireless Sensor Networks (WSN) needs to define new strategies to aggregate and encode data according to 2D sensor deployments. In this paper optimal design of communication protocol for WSN is conveniently cast for a set of linear sensor networks (sensor arrays) synchronously monitoring a correlated 2D time-varying field (e.g., for tracking time variations)...
Wireless Sensor Networks (WSNs) have been of high interest during the past couple of years. One of the most important aspects of WSN research is location estimation. As a good solution of fine grained localization Reichenbach et al. introduced the Distributed Least Squares (DLS) algorithm, which splits the costly localization process in a complex precalculation and a simple postcalculation which is...
Wireless Body Area Network (WBAN) allows the integration of low-power, miniaturized, intelligent, invasive or/and non-invasive wireless sensor nodes that are used to monitor the health status of a patient with real-time updates to a base-station/physician. Since multiple low-power sensor nodes are deployed in/on a human body, Medium Access Control (MAC) protocols are required to share the channel...
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