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In wireless sensor networks (WSNs), how to gather the sensory data efficiently is a major challenge to deploy effective sensor systems. The compressive sensing (CS) provides an improved data acquisition method in WSNs by exploiting a priori data sparsity information. Moreover, the concept of group sparsity has been evolved into signal recovery, which can further enhance the recoverability. In this...
Node localization is a fundamental and important technology in wireless sensor networks. In this paper, a localization algorithm in wireless sensor networks based on PSO is proposed. Unlike most of the existing location algorithm, the proposed algorithm figures out the rectangular estimation range of unknown node by bounding box algorithm and takes one value as the estimated coordinates of this node,...
Two important issues have arisen in 5G wireless communications: spectral efficiency and energy efficiency. The existing wireless communication architectures and technologies may not be able to address these two issues at the same time for 5G multi-tier networks where users in different tiers have different priorities for channel access. In this article, we first present the motivation for our proposal...
Mobile object localization and tracking means that a multitude of sensor nodes collaborate with each other to determine the locations and tracks of target objects in a specified area. It is one of the most significant research directions in WSN. This paper implements a system named MOLTS (Mobile Object Localization and Tracking System Based on Wireless Sensor Networks), which applies abundant sound...
To acquire continuous observation results is an essential demand to environmental monitoring. Wireless sensor networks (WSNs), composed of many tiny sensing equipment, give a good solution to collect continuously temporal and spatial data. Due to the limitation of WSNs, such as volume of wireless sensors, cost, energy, processing capability, and transmission distance, we need a solution in charge...
The Localization is an important topic in wireless sensor networks (WSN). In this paper, an improved Sum-Dist approach is used to reduce the impact of distance measurement errors on the location estimate. In addition, the proposed strategy to get accurate position of the unknown sensor using by using a minimum numbers of anchor nodes can reduce the final localization error. The simulation results...
The failed nodes lead to the phenomenon of coverage holes in Wireless Sensor Networks (WSN), which is due to the exhausted energy or destroyed environment. In this paper, the Best Fit Node Policy (BFNP) is proposed to repair coverage holes of WSN. The main idea of Best Fit Node Policy (BFNP) is that WSN detects the coverage holes when the base station has found the failed nodes of network, and selects...
The nodes of wireless sensor networks (WSNs) should execute tasks such as sensor data acquiring, routing, data processing etc, it will cause decrease of the data transmission rate while using single-task framework. In the paper, multitask cooperation of thread pool technology is applied to WSNs. It will no only speeds up the executing efficiency of WSNs, but realizes task decoupling easily, avoids...
Recently years research on wireless sensor networks (WSN) paid more attention to solve the localization of the wireless sensors, different algorithms had been applied, one of them is DV-Hop, which still need to be improved to obtained better position accuracy. In this paper, we propose a strategy to get accurate location from the unknown sensor using the average hopsize and average error reducing...
Multi-sensor was needed while using data fusion technique in wireless sensor networks. A data fusion algorithm of single sensor was proposed in the paper. With recursive least square method in the algorithm, the dynamic model of sensor was built up, and the achievement of data fusion between sensor's measure value and estimate value increased the measure precision. Simulation results show that the...
Concerning event-driven wireless sensor network scenario where the traffic has burst-bulk characteristic, an intra-flow network coding based opportunistic multipath routing protocol called Code Paths was proposed. A routing metric taking delay and congestion factors into account has been defined and implemented, which is used to establish gradient field from nodes to sink. When an event occurs in...
A new addressing protocol, TTDA (two-tier dynamic addressing protocol), is proposed for cluster-based wireless sensor networks in this paper. Two-tier address assignment is adopted in TTDA, in which the sink node assigns addresses for the cluster heads using Huffman coding to reduce energy consumption by allocating shorter addresses for nodes far from sink, and the cluster head nodes assign addresses...
Data forwarding in the wireless networks typically employs a sender-oriented approach in which the next hop node is pre-selected based on neighbor or network information. This method incurs large overhead when accurate information is needed for making the optimal forwarding decision. In this paper, a receiver-oriented robust data delivery scheme (RRDD) is proposed for mobile sensor networks. In RRDD,...
Clustering techniques in routing protocols improve the scalability of wireless sensor networks. To solve the "hot spot" problem caused by the cluster heads near the sink, which are burdened with heavy relay traffic via multi-hop transfer and tend to die earlier and therefore leads to the network being partitioned, an energy balanced scheme based on variable cell transmission range for wireless...
Clustering is a popular topology control method in wireless sensor networks, which can facilitate the network self-management and make it easy to devise the communication protocols. Also clustering can improve energy efficiency and the network scalability. Existing clustering algorithms concern much about the local energy consumption, but little about the overall energy consumption. A novel energy-efficient,...
An energy-efficient event detection and dissemination (EEDD) scheme for event-driven wireless sensor networks applications is introduced. Based on clustering-based architecture, EEDD includes sensor and aggregation management, sleep and wakeup scheduling, and a customized multi-channel MAC/routing protocol with power control. Bit map based MAC approach is adapted to use not only in intra-cluster communication,...
Network-layer address is used to identify sensor nodes in wireless sensor networks (WSNs). Since a WSN might be composed of a huge number of sensor nodes, it is difficult to assign an address to each node manually. In this paper we propose a novel auto-configuration algorithm ACSA, which assigns an address to a geographical area instead of an individual sensor node. This addressing scheme is based...
The limited battery power characteristic limits the utilization time of wireless devices and networks. Thus, an energy-efficient routing protocol is critical to the performance of Wireless Sensor Networks (WSNs), especially to the lifetime of network. Some routing protocols have been proposed in previous work which mainly concentrated on the efficient use of energy. This paper proposes a novel energy-efficient...
Acquiring critical events for mobile or static sinks poses great challenges for applications of wireless sensor network in emergency response and other surveillance scenarios. In this paper, a clustering-based multi-path data dissemination scheme (CMPDD) is proposed. The cluster head and several dissemination nodes in each cluster collaboratively process data and deliver data to multiple mobile/static...
This paper presents an adaptive distributed TDMA slot assignment algorithm, called A-DRAND, which is an improved version of DRAM) in clustered wireless sensor networks where cluster heads need more slots and will be alternated afterwards by other cluster members for energy balance reason. It utilizes cluster info to allocate slots discriminately for different kind of sensor node and adapts its operation...
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