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Here three subwavelength multiband receiving antennas have been designed using corrugated ring resonator printed on a thin dielectric substrate with spiral-shaped defect ground structure (DGS). Numerical simulations verified that these multiband antennas have multiband with a small size of only 0.1λ*0.1λ. In addition, a 2*2 antenna array has been proposed and numerically demonstrated that the gain...
With the growing use of wireless devices and easy access to received signal strength (RSS), there are increasing attentions on utilizing RSS technology for indoor positioning. In this paper, we propose indoor positioning algorithm based on parallel multilayer neural network (PMNN) for RSS-positioning. Two multilayer neural networks are trained separately to estimate x and y coordinate index, using...
In Wireless Sensor Networks, the attribute-based naming using data-centric characteristics of sensor nodes has been attracted researchers’ attention because it is impractical for sensor applications to communicate directly to an individual sensor node. Related researches proposed effective data abstraction scheme essential for a smart sensing, but they reveals several weaknesses of heavy code problem,...
The opportunistic cooperative platform and adaptive cooperative control scheme were proposed based on the redundancy degree and priority of cooperative data packet, as well as selective characteristics of time domain and frequency domain. First, opportunistic cooperative platform was defined according to the cooperative data stream scale, mapping algorithm, and priority and redundancy of cooperative...
In real-time multimedia applications, the most problems are how to store, process, and transport the multimedia data with cloud, how to optimize the cloud platform to satisfy the user demand, as well as how to provide the quality of service (QoS) guarantees by combining cloud platform and wireless sensor networks (WSNs). To overcome these issues, the multimedia cloud was designed according to the...
The majority of wireless sensor networks are built on bespoke platforms, that is, custom designed and built hardware with a light weight software stack. There are a number of advantages to this approach. First, the ability to closely match and minimise the resource requirements (e.g., power consumption and communications protocols) to those that are suitable for the intended deployment. Second, as...
Aquatic environments are extremely difficult for developing, deploying, and maintaining wireless sensor networks. Networks deployed in aquatic settings face multiple challenges, such as marine fowling of equipment, limited power supply, communications difficulties, and restricted accessibility for maintaining and updating sensor nodes. The SEMAT project is an initiative to create “smart”, low-cost,...
Developing a large sensor-based observation system faces two serious challenges: 1) incompatible sensor technologies from different manufacturers; and 2) complexity of the data streaming process. Sensor Abstraction Layer (SAL) is a middle-ware integration platform which enables a single interface to view and control heterogeneous sensors regardless of the technologies involved. Although SAL addresses...
Wireless sensor networks (WSNs) require simple and facile error control schemes because of the low complexity and high energy efficiency request of sensor nodes. In this paper, we discuss ARQ, FEC, and Chase combing hybrid ARQ (HARQ) schemes using energy efficiency analysis on different communication distances and link layer frame lengths. We proposed a high energy efficiency adaptive error control...
This paper proposes a link layer adaptive hybrid FEC/ARQ based on Hops (HH-FEC/ARQ) for Wireless Multimedia Sensor Networks, in the hope that the media could be played on receiving sensor nodes with high quality. The algorithm, based on cross-layer optimization design, adjusting the FEC parameter N and the ARQ parameter Nmax according to the Hops of the link layer frames, can maximize the performance...
Mobile Sensor Networks (MSN) are used for network load balancing, prolonging network lifetime, and improving network coverage by monitoring critical areas where manual sensor deployment cannot be performed. Addressing the problem of how to achieve maximum network coverage and network uniformity, after deploying sensors in critical areas randomly, is of significant importance recently. In this paper,...
Mobile sensor networks have received significant attention recently. Mobile sensors are deployed to achieve network load balancing, prolonging network lifetime, and improving network coverage, by monitoring critical areas where manual sensor deployment cannot be performed. To achieve these goals, energy estimation is one of the main constraints and concerns to consider, while deploying mobile sensors...
Wireless multimedia sensor networks (WMSNs) are a new and emerging type of wireless sensor networks (WSNs), which enable applications of multimedia captured through special sensors equipped with cameras or microphones etc. However, WMSNs face the challenges of transport reliability and energy consumption. In this paper, we propose an adaptive error control mechanism based on the importance of link-layer...
Recently there have been many research topics in wireless sensor networks (WSN) for efficiently monitoring the environments, and localizing, detecting, and classifying targets of interest. Most of these researches assume that the environment to be stable. On the other hand, if the sensor nodes are deployed randomly, the establishing connection between the sensor nodes is critical importance. In this...
Energy efficient and reliable data forwarding becomes important if resources are limited such as in wireless sensor networks. Although directed diffusion, a data centric routing approach is widely used in wireless sensor networks,it is inefficient in terms of reliability and energy efficiency. In this paper we present a new routing scheme for wireless sensor networks, in which routing is based on...
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