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A distributed transmit beamforming technique is developed for both a static and a time-varying channel in a wireless sensor network. This algorithm is based on an iterative procedure that synchronizes the transmitters to send a common message signal coherently to the receiver, using a 3-bit feedback in each timeslot. Results show that the received power increases quadratically with number of transmitters,...
This paper discusses an energy constrained distributed estimation in wireless sensor network (WSN) based on frequency and time division multiple access (FTDMA). In a measurement with WSN, sensors transmit observed quantized data to a fusion center (FC) via radio communication channels, to obtain a final estimate. Such systems require a multiple access technique such as time division multiple access,...
In this paper, we consider a collaborative scheme in wireless sensor networks where the multiple access protocol is a DS-CDMA one. When the receiver is equipped with an antenna array, it has been shown that efficient blind receivers can be derived using the PARAFAC tensor model. In general, the parameters of the PARAFAC model are fitted using an alternating least squares algorithm. Herein, we consider...
With the emergence of wireless sensor networks in military surveillance, environmental monitoring and other fields, security has become an important issue. Wormhole attack can destabilize or disable a wireless sensor network. In typical wormhole attack, the attacker receives packets in the network, forward them through a wired or wireless link with high-bandwidth low-latency links than the network...
In this paper, a ZigBee-based wireless sensor network is configured for the robot to effectively communicate with the environment platform where each sensor node is implemented using a high performance microcontroller. The localization and the navigation functions are also required for the robot and the functions are executed with various types of sensor information. A new type of ZigBee stack is...
In this paper, we propose a novel localization algorithm in Wireless Sensor Network. The proposed method is a kind of range-free localization algorithm which only uses the proximity information between sensor nodes. In the proposed method, a robust weighted algorithm is presented to calculate the average hop distances between sensor nodes and anchor nodes. The proposed method is applied to an isotropic...
Data transmission reliability is an important issue in the design of wireless sensor networks. This paper proposes a new network coding strategy combing with ARQ to improve data transmission reliability. By using single-path transmission and multi-path transmission,performance analysis of the presented strategy is given. In addition, effectiveness of the strategy is demonstrated by simulation.
In a wireless sensor network (WSN), the sensors closest to the sink tend to deplete their energies faster than the other sensors, which is known as an energy hole around the sink. To avoid this, a new scheme for placing nodes, via adjusting surface densities and initial energies in each ring in a ring model, is proposed in this paper. A new definition of network efficiency, including the consideration...
Wireless sensor networks are becoming more and more popular; however, with the advent of smart dust the security for wireless sensor networks is still a trouble. Resolving security for wireless sensor networks, an important problem is key distribution. In this paper, we show how the key distribution problem can be dealt with in environment and we make full use of asymmetric cryptographic technique...
How to minimize the network redundancy and prolong network life are important problems while designing a coordinated multi-sensors coverage system. By adopting stochastic sensing model for each sensor node, this paper founds an optimization model for coordinated multi-sensors coverage problem. Then an improved genetic algorithm based on parallelism selection is presented. The simulation results show...
This paper is concerned with the filtering problem for both discrete-time stochastic linear (DTSL) system and discrete-time stochastic nonlinear (DTSN) system. In DTSL system, an optimal filter with packet dropouts is designed across unreliable wireless sensor networks (WSNs); In DTSN system, a suboptimal filter is derived by similar method over unreliable WSNs. An application example is given and...
Heterogeneous wireless sensor networks provide endless opportunities due to their extendable capabilities such as different computing power and sensing range, but at the same time pose formidable challenges, because of the fact that energy is a scarce and usually non-renewable resources. Deployment of sensor nodes in a sensor network is a critical task as deployment should be optimum to increase network...
The main objective of sensor deployment problem in Wireless Sensor Network (WSN) is to use minimum number of sensor nodes with given sensing range that can cover any target in the coverage area to monitor the environment. The optimal sensor deployment enables accurate sensing information on target behavior with minimum sensing range and number of sensor nodes. The target coverage terrain in a locality...
A novel approach for an on demand routing protocol using sensor attractiveness-metric (Pa) gradients for the data forwarding decisions is proposed. Attractiveness based routing provides an efficient concept for a data-centric routing in wireless sensor networks. The protocol works on-demand, is source-initiated, has a flat hierarchy and has its origin in the idea of pheromone based routing. During...
Wireless sensor networks have received considerable attention in recent years and played an important role in data collection applications. Sensor nodes usually have limited supply of energy. Therefore, a major consideration for developing sensor network applications is to conserve the energy for sensor nodes. In this paper, we propose a novel energy-efficient data acquisition algorithm based on the...
Gas cylinders are used in many different situations, such as in research, in industry, in healthcare, and even in the home. Due to demand in such a wide variety of circumstances, there is the inevitable ambition of gas suppliers to improve the efficiency of their business. To this end, a tracking system is proposed in this paper in order to provide such improved efficiency whilst also integrating...
This paper presents a scheme, in which the collaborative efforts of limited number of sensor nodes provide the social guidance for localization process to be used for uniform distribution of the clusters, over the network area. Utilizing the information provided in the form of gbest value and the direction for position update as social guidance, the sensor nodes localize them iteratively adjusting...
For the importance of monitoring system in mine, this paper describes the application of wireless sensor networks for mine safety monitoring. Schemes for clustering and mobile node based on the characteristics of mine wireless sensor networks are proposed in roadway. The simulation results show that the clustering and mobile node schemes achieved in this paper can meet the requirements of mine, and...
A Digital Ecosystem is an evolving computer based system that uses communication and networking technologies to provide a solution for a specific application domain. This paper investigates how the latest multimedia and communication technologies can be used in the development of Digital Ecosystems. The high-level models of two ongoing research projects for developing Digital Ecosystems are presented...
K-coverage is a classic issue in wireless sensor network (WSN) deployment. Existing works typically assumes that every position in the monitoring field is covered by at least k sensor nodes at any given time. This may not always be necessary because certain events to be monitored will last only for a short period of time. Based upon such observation, we include the time dimension in the original k-coverage...
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