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Shadowing losses on proximate wireless links have been experimentally proven to be highly correlated in various scenarios. However, most of the existing works on the reliability modeling of Wireless Multi-Hop Networks (WMHNs) assume independent link shadowing. Neglecting shadowing correlations could lead to inaccurate network simulation results and unreliable wireless system design. In this paper,...
Wireless image sensor networks acquire and transmit image data through self-organized method. Considering processing ability, energy consumption and cost, this paper implements a practical image sensor node with low-power sleeping mechanism in order to achieve image data's gathering, processing and transmission. To ensure transmission reliability of image data in wireless channel, this paper improves...
Through researches on design and application of wireless sensor network in botanic garden environment monitoring system, enforcing the deployment of wireless sensor network in areas that traditional wired network unable to reach, hence support task systems. This paper discusses the features of wireless self-organize sensor network and the feasibility of adopting this technology in botanic garden;...
Wireless Sensor Networks (WSNs) consist of a large number of wireless nodes and are responsible for sensing, processing and monitoring environmental data. WSNs suffer of some problems such as limited processing capability, low storage capacity, limited time of testing and limited reliability. The Compressed sensing theory holds promising improvements to these parameters. Compressed Sensing shows that...
We use wireless networks in various field. However, a link of realistic wireless sensor networks (WSNs) can be unreliable. Therefore, data forwarding with efficiency and reliability is a core issue. For solving previous geographic routing protocols, we proposed Protocol considering Both side of Link-quality and Energy (PBLE), an efficient and optimal routing protocol that uses modified link-quality,...
Wireless sensor networks can be used to deploy various applications to reflect the circumstance of environment. Video sensors used in wireless multimedia sensor networks (WMSNs) enhance such applications with multimedia data, but with specific characteristics requirement for the network. The aim of this work is to provide reliable data transport with multipath routing and load balancing congestion...
Wireless sensor and actor networks (WSANs) can be considered as a combination of sensor network and actor network in which powerful and mobile actor nodes can perform application specific actions based on the received data from the sensors. As most of these actions are performed collaboratively among the actors, so the connected inter-actor network is important to the effectiveness of WSANs. However,...
Body Area Networks (BANs) are only recently beginning to revolutionize e-healthcare by making monitoring of various patients accessible and convenient for physicians and patients. Past research in BANs has focused on biosensor design, signal processing, power efficiency, and wireless protocols. However, numerous challenges plague its development and implementation to this day. One of these is the...
Existing deployments of wireless sensor networks (WSNs) are often conceived as stand-alone monitoring tools. In this paper, we report instead on a deployment where the WSN is a key component of a closed-loop control system for adaptive lighting in operational road tunnels. WSN nodes along the tunnel walls report light readings to a control station, which closes the loop by setting the intensity of...
In this paper we formulate and analyze a model for assessing the reliability of a wireless sensor network (WSN) based on classifying the operating states of each node at any instant into one of three possible states: a state where both the sensing and wireless modules are operating, a state where only the wireless module is operating, and a state where the wireless module is failed. Thus, in the second...
Ubiquitous technology through sensor networks is being applied to numerous industrial fields specially to increase the quality of human life (QoL). Therefore, Wireless Sensor Networks (WSNs) lossless data is one of the communications challenges to provide accurate data. Although, end-to-end data retransmission has evolved as a reliable transportation in Internet, this method is not applicable to WSNs...
New propagation techniques using magnetic induction (MI) waveguide solve the problems of traditional techniques in the underground soil medium. However, the deployment of the MI waveguide to connect the wireless underground sensor networks (WUSNs) is challenging due to the high deployment cost and the complex shape of the communication range of the MI waveguides. In this paper, two algorithms are...
Wireless sensor networks are equipped with batteries with limited charge, and are often deployed in conditions that make their retrieval and replacement infeasible. Thus, energy conservation has been a primary consideration for protocol design for such networks. Recent advancements in the transfer of energy wirelessly over large distances, such as through radio frequency electromagnetic (EM) waves...
Data packets in multi-hop wireless sensor networks require a variety of Communication Reliability (CR) according to applications. Recently, a scheme for supporting a desired CR, called AC, has proposed. In order to support the desired CR, AC simply maintains 100% of data packets of a source at intermediate nodes on a routing path which do not satisfy the desired CR. However, since AC does not consider...
As many experimental simulations were conducted in the field of wireless sensor networks, OMNeT++ has gained popularity due its scalability and rich graphical user interface. The use of OMNeTT++ based simulation for reliable point-to-point wireless transmission and realistic Segmentation and Reassembly (SAR) with error control for a distributed wireless sensor network are explored. Simulations demonstrated...
Clustering technique is an effective topology control approach which can improve the scalability and lifetime in wireless sensor networks (WSNs). LEACH is a classical clustering algorithm for low energy scheme, however, it still have some deficiencies. This paper studies LEACH protocol, and put an Improved LEACH protocol which has more reasonable set-up phase. In the cluster heads election phase,...
This paper proposes medium contention aware routing schemes for rate-constrained traffic in wireless sensor networks (WSNs) that maximize network lifetime. Three sufficient conditions, referred to as rate-based, degree-based, and mixed constraints, are incorporated into the routing formulations to guarantee medium access feasibility of the routing solutions. Simulations show that the mixed condition...
Adaptive packet sizing techniques are widely used in wireless communication to enhance the link reliability. Typically, shorter packets are less error prone than longer packets. Adaptive packet size technique is used in IEEE 802.11 wireless network to enhance link reliability and packet delivery ratio. In this work, we adopt this technique to work in IEEE 802.15.4 based networks, and specifically...
Recent advances in wireless multimedia sensor networks have led to disjoint multipath routing protocols specifically designed for transmitting large multimedia traffic. Towards the coexistence of different kinds of multimedia traffics, a packet scheduling scheme is proposed for disjoint multipath routing based wireless multimedia sensor networks. The scheme classifies the packets into four classes...
This study investigates the graph theoretic implications of applying collaborative rate-adaptive storage and data management to enhance the reliability of connectivity-challenged sensor networks employing dynamic heterogeneity setups. The topologies of sensor networks are synthesized through a spatially-dependent probabilistic random graph model. Around this model a degree-density-connectivity-clustering...
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