The concept of long-range wireless power transmission (WPT) has been formulated shortly after the invention high microwave amplifiers. promise WPT, energy transfer over large distances without need to deploy a wired electrical network, led development landmark successful experiments, and provided incentive for further research increase performances, efficiency, robustness these technological solutions. In this framework, key-role challenges in designing transmitting receiving antenna arrays...

Application of wireless technologies in the smart home is dealt with by pointing out advantages and limitations available approaches for solution heterogeneous coexisting problems related to distributed monitoring inhabitants. Some hot challenges facing exploitation noninvasive devices user behavior are then addressed application fields power management elderly people chosen as representative cases where estimation activities improves potential location-aware services home. The problem...

A decision support system based on the combination of wireless sensor and actuation network technology fuzzy logic theory is proposed to irrigation management in agriculture. The farmers' experience best practices are modeled through rule sets, outputs numerical soil crop models used provide a context-aware optimized schedule. suggested actions devoted reduce waste water maximize yield according weather conditions real needs. methodology embedded gateway making system, truly smart autonomous...

In this paper, the design of sparse planar arrays is yielded through a set innovative and efficient pattern matching algorithms within Bayesian Compressive Sensing (BCS) framework. Towards end, 2D synthesis problem formulated in probabilistic fashion single-task (ST) multi-task (MT) BCS solutions are derived. The results from numerical validation concerned with different aperture size target patterns prove that proposed implementations enable an element saving ranging 25% up to 87%, while...

The localisation of moving and transceiver-free objects is addressed by processing the Received Signal Strength Indicator (RSSI) available at nodes a wireless sensor network. Starting from RSSI measurements, probability presence unknown mobile determined means customised classification approach based on support vector machine. Experimental results assess feasibility proposed approach.

In this paper, an innovative strategy for the passive localization of transceiver-free objects is presented. The yielded by processing received signal strength data measured in infrastructured environment. problem reformulated terms inverse source one, where probability map presence equivalent modeling moving target looked for. Toward end, a customized classification procedure based on support vector machine exploited. Selected, but representative, experimental results are reported to assess...

We describe the deployment of a Wireless Sensor Network (WSN), composed 135 soil moisture and 27 temperature sensors, in an apple tree orchard about 5000 m2, located municipality Cles, small town Alpine region, northeastern Italy. The is divided into three parcels each one subjected to different irrigation schedule. objective present work monitor dynamics top detail, both space time, suitable analyze interplay between plant physiology. consists locations (verticals) connected by multi hop...

The knowledge of the directions arrival (DOAs) signals impinging on an antenna receiver enables use adaptive control algorithm suitable for limiting effects interferences and increasing gain towards desired in order to improve performances wireless communication systems. In this paper, innovative multi-resolution approach real-time DOA estimation multiple a planar array is presented. method based support vector classifier it exploits multi-scaling procedure enhance angular resolution...

Abstract The integration of smart antennas in wireless sensor networks is a challenging and very attractive technical solution to improve the system capacity, quality service, power control. In this paper, some benefits coming from such an are experimentally assessed dealing with set test scenarios. Finally, conclusions discussed order point out current potentialities limitations envisage future possible advances.

In this letter, the design of a quad-band antenna is presented. The has planar geometry printed on dielectric substrate orthogonal to reference ground plane and its geometrical parameters are optimized starting from Hilbert-like prefractal shape. reliability synthesized assessed by means set experimental tests verify compliance with project constraints.

In this paper, a multiband antenna based on perturbed Sierpinski Gasket fractal for distributed systems in ubiquitous wireless environments is presented. The enables communication services within the 868/915 MHz ZigBee bands and 2.4 GHz WLAN frequencies. geometrical characteristics of radiator are determined to fit electrical radiation requirements through an optimization approach particle swarm strategy. prototype performances assessed numerical experimental validations.

Driven by economic and environmental pressures, precision agriculture has brought many technological enhancements to traditional farm machinery management tools. For a small tillage, manual control of inputs (such as water, fertilizer, pesticide) is still possible, but such an approach becomes unfeasible for larger cultivations. Furthermore, the based on operator's opinion often have no quantitative basis. In order optimize yield use available resources, wireless sensor networks can play...

The smart control of lighting systems in museums deals with multiple and competing objectives, such as the quality visitor experience well energy saving. An evolutionary optimization strategy is proposed to adaptively intensity lights starting from real-time measurement brightness conditions consumption. system implemented using low-cost wireless devices it has been experimentally validated a real indoor test site. obtained results point out capability find optimal actuation able satisfy...

The pesticide dosage reduction is addressed by means of an innovative combination the wireless sensor network technology and fuzzy logic theory. proposed solution introduces estimation spatial distribution optimal thanks to pervasive feature architecture. rules imitate human reasoning through simple modeling farmers' best practices. has been experimentally tested in a vineyard north Italy for treatment downy mildew infection. A 47% obtained during three-months measurement campaign.

In the last two decades, wide diffusion of mobile phones and wireless technologies has brought many advantages in professional activities as well everyday life. general, communication networks are constituted by a limited number base stations. The spatial distribution field radiated from stations turns out to be non-uniform with variations both time space that can exceed normative limits electromagnetic emissions. order real-time long-term monitor emissions, an innovative low cost solution...

In this letter, the prototype of a planar antenna working in three different frequency bands and suitable to be integrated multimode wireless devices is described. The fed by single RF port without any matching circuit, it operates DVBH channel at GSM UMTS bands. Its dimension 0.15 lambda lower band. effectiveness feasibility proposed assessed means both simulations measurements.

Wireless sensor networks (WSNs) are composed of autonomous nodes that cooperate among themselves to monitor scenarios in environmental, industrial, civilian and military applications. The wide applicability such systems stimulates the growth intelligent services make living environments more comfortable safer. Concerning security surveillance issues, WSNs have been widely integrated with multi-modal sensors actuators order actively detect any abnormal events. Though fusion provides accuracy...

The design of electrical filters for the suppression electromagnetic interferences is a complex multiconstrained problem. solution to such problem aims identify suitable circuit and components taking in consideration nonidealities hardware as well parasitic phenomena. A customized optimization strategy proposed automatic ready-to-build filter solution. procedure integrates circuital simulator library models simulate behavior commercially available passive components. obtained designed fit...

ABSTRACT This work is aimed at presenting the water saving potentialities of a scalable smart irrigation system applied to precision agriculture. A fuzzy logic strategy integrated in distributed monitoring based on wireless sensor network technology. The optimal schedule adaptively estimated according real‐time measurement soil status and weather conditions. objective optimize content ( i ) maximize health plants, ii improve quality products, iii reduce waste water. proposed has been...

Thanks to the coordinated infrastructure composed by a distributed collection of different resources, sensor webs currently represent very effective solution earth observation. These global entities are able coordinate networks heterogeneous sensing platform, such as spacecrafts, airborne instruments, or ground-based devices. In framework technologies operating at local level, wireless (WSNs) characterized small, low-cost, and autonomous devices that collect data about physical quantities in...

Abstract The wireless localization of mobile terminals in indoor scenarios by means a semantic interpretation the environment is addressed this work. A training‐less approach based on real‐time calibration simple path loss model proposed which combines (i) received signal strength information measured terminal and (ii) topological features domain. customized evolutionary optimization technique has been designed to estimate optimal target position that fits complex propagation...

In this paper, the real-time estimation of indoor occupancy has been evaluated starting from processing environmental parameters. The proposed system is based on a low cost and non-invasive wireless sensor network infrastructure for distributed acquisition simple quantities like temperature humidity. algorithm structured in three successive phases detection, filtering, classification order to face with high variability instability such quantities. problem recast as an inverse solved by means...

In this paper, a method for the localization of mobile devices within museum areas is proposed. The proposed semantic wireless approach combines potentialities RSS-based active with those representation environment. final objective real-time and accurate estimation visitors positions in order to provide new advanced services useful (e.g., adaptive contents related position, path, interests) as well managers flows, statistics, security). A customized App has been developed installed on...