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With the development and extensive application of Wireless Sensor Networks(WSN) technology, Wise medical Treatment has entered the ordinary household. A patient positioning System is designed based on WSN in this paper. Distance Vector-Hop (DV-Hop) algorithm is used by through analyzing the system working environment, and some improvement has made on the basis of it's error analysis. There are two...
Localization of wireless ad hoc and sensor networks has gained research attentions for several years. This paper proposes a hybrid localization scheme which exploits Received Signal Strength (RSS)-based ranging and Self Organizing Maps (SOM)-based range free localization methods to obtain the tradeoff between cost, power and location accuracy. By utilizing RSS-based distance estimation and connectivity...
This paper addresses the optimality of Network topology for localization purposes when measurements are range-only. Localization procedures based on TOA and TDOA range measurements are considered in this paper. As of now, the optimal placement of fixed terminals to locate mobile terminals has been studied based on Cramer-Rao Lower Bound (CRLB). CRLB is a universal bound on the variance of a general...
In wireless sensor networks, location-aware applications require an accurate and robust sensor localization algorithm. Among them, most of the multihop-based localization algorithms approximate the shortest path distances to the Euclidean distances. This approximation is valid only if the sensors are uniformly and densely deployed in a convex area where the shortest paths are close to straight lines...
Wireless Sensor networks are seen as one of the most promising emerging technologies, and location awareness is highly critical for wireless sensor networks for fulfilling its mission. Currently, the researches on localization generally focus on how to locate the position of the sensors, and at the same time, some researches on whether the network can be localizable are blooming, and some necessary...
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...
Geographic location of nodes is very useful for a sensor network. A novel and practical Radio Frequency (RF)-based localization algorithm called Kcdlocation is presented for some specific network topologies, such as grid and linear topology. The Kcdlocation can be applied to those wireless sensor networks deployed with known coordinate database. This algorithm examines the ordered sequence of neighboring...
This paper deals with the multi-hop localization problem in static Wireless Sensor Networks. The knowledge of geographical positions of nodes is useful in such networks, as it can be used in communication protocols or to provide geographical information of detected events. We present in this paper a new and original method to locate sensor nodes, named ADNL. In our method, each sensor knows anchor...
Many applications of Wireless Sensor Networks (WSNs) require sensor nodes know their positions. Equipping GPS modules can solve this problem easily, but it is of high cost. In this paper, we propose a centralized localization algorithm for WSN based on mesh relaxation method. Computer simulations show that with our algorithm the positions of nodes can be estimated in a relative coordinate system,...
In many applications of Wireless Sensor Networks (WSN), it is crucial to know the location of sensor nodes. Although several methods have been proposed, most of them have poor performance in irregularly shaped networks. MDS-MAP is one of the localization methods based on multidimensional scaling (MDS) technique. It uses the connectivity information to derive the location of the nodes in the network...
Connectivity-based routing protocols provide an attractive option for point to point communication in wireless networks due to its potential for low routing overhead. However, when the entire hop-count vector is used to address each node, the communication and storage overhead in the packets are often so high that it is not feasible to implement existing connectivity- based routing protocols infeasible...
Wireless sensor networks have been widely used for ambient data collection in diverse environments. While in many such networks the sensor nodes are randomly deployed in massive quantity, there is a broad range of applications advocating manual deployment. A typical example is structure health monitoring, where the sensors have to be placed at critical locations to fulfill civil engineering requirements...
Wireless sensor networks (WSNs) collect data (e.g. temperature, moving, humidity) from several energy-constrained sensor nodes and relay it to a single sink node. Therefore, the energy resource of the sensor nodes should be managed efficiently to prolong network lifetime. A single sink node topology is simple to implement and most of the researches assume a single sink node, but, as the number of...
Self-localization in wireless sensor networks (WSN) should be precise and reliable. Alternative least-square scaling algorithm (ALESSA) is a recently proposed centralized multidimensional scaling (MDS)-based localization algorithm, which uses an iterative approach to solve for the coordinates of discrete points. While ALESSA converges most of the time, like most iterative algorithm, it can be trapped...
Topology control in a wireless sensor network is useful for ensuring that the network remains connected in the presence of nodes that exhaust their energy or become altogether dysfunctional (for whatever reasons). It also ensures that all the link that can be established are energy-efficient links and the nodes utilize their energy fairly. In this paper, we propose a fair and energy efficient topology...
Given a network of N nodes with the i-th sensor's observation xi isin RM, the matrix containing all Euclidean distances among measurements ||xi - xj || foralli, j isin {1,..., N} is a useful description of the data. While reconstructing a distance matrix has wide range of applications, we are particularly interested in the manifold reconstruction and its dimensionality reduction for data fusion and...
In near future, wireless sensors networks (WSN) are expected to be deployed for a vast variety of applications. For many of these applications, sensed data individually have no meaning without proper knowledge of position where the data was sensed. Although there have been proposed algorithms for localization, many of them fall short with respect to complexity, cost, security and accuracy. Some issues...
In heterogeneous sensor networks, nodes may have a certain energy level distribution, how to get balance energy consumption and prolong the life span of wireless sensor network (WSN) is one of core issues in WSN. Focus on the issues; this paper put forward a dynamic adaptive routing protocol for heterogeneous WSN. This protocol includes topology control and multi-path routing algorithms.Simulation...
We propose a generic routing table design principle for scalable routing on networks with bounded geometric growth. Given an inaccurate distance oracle that estimates the graph distance of any two nodes with constant factor upper and lower bounds, we augment it by storing the routing paths of pairs of nodes, selected in a spatial distribution, and show that the routing table enables 1 + epsiv stretch...
Topology Control (TC) is one of the most important techniques used in wireless ad hoc and sensor networks to reduce energy consumption and radio interference, The goal of this technique is to control the topology of the graph representing the communication links between network nodes with the purpose of maintaining some global graph property (e.g., connectivity), while reducing energy consumption...
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