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In this paper, a maximum efficiency extracting technique is presented for endoscopic capsule's Wireless Power Transfer (WPT). Instead of conventional regulators, a DC-DC Bulk LTC3129-1 with Maximum Power Point Control (MPPC) capability is adopted to boost the power conversion efficiency of the WPT receiver (including RF-DC rectifier and DC-DC Converter) up to 60%. Measurements validate that DC-DC...
Node localization plays a fundamental role in wireless sensor networks (WSNs). The distance vector hop (DV-Hop) algorithm is one of the best localization algorithms because of its low complexity, low cost, and simplicity. However, the localization accuracy can be poor when the number of anchor nodes is low. To improve this accuracy, a weighted DV-Hop algorithm based on the received signal strength...
This paper is concerned with the problem of distributed state estimation for linear discrete system with packet loss. A state prediction consensus mechanism is introduced to promote the estimation performance. By applying matrix theory, a sufficient condition for the convergence of the estimation error system is derived. Then, a numerical example is given to show the algorithm proposed in this paper...
With the rapid development of wireless sensor network (WSN), Entity authentication in a wireless environment is highly desirable, but ensuring security and efficiency of this process is challenging. In this paper, we built a two-party entity certification model based on SEAHA (Secure and Efficient Handover Authentication) scheme, and made improvements on its authentication algorithm. The improved...
A two-stage centroid localization algorithm for wireless networks (WSNs) based on received signal strength (RSS) is proposed. In the first stage, the unknown node performs symmetric lens presence tests to construct a virtual neighboring anchor list. By using the locations of two neighboring anchors and the RSS relationships, a symmetric lens presence test determines a residence area of the unknown...
In the underwater sensor network, the deployment of multiple water surface gateway can effectively improve the network capacity, reduce the network delay and save the energy of underwater sensor nodes. Due to the underwater sensor nodes is easily affected by ocean currents affect which occurred in the position drift, surface gateway deployment locations need regular dynamic optimization and update...
Localization has been a fundermental and crucial issue for wireless sensor networks (WSNs). In this paper, we propose a distributed range-free localization scheme based on RSS rank vectors (RRV). In RRV, each normal node is first localized in an estimative rectangle based on the connectivity constraints. Then the estimative rectangle of the normal node is refined with the RSS rank vector. At last,...
Aiming at issues of load imbalance and low energy efficiency in the existing underwater sensor network clustering algorithm, a novel global optimal clustering algorithm with the low complexity and parallel processing is proposed. The algorithm is based on the basic idea of particle swarm optimization algorithm (PSO). After the binary initial code of the sensor nodes, the particle code is adjusted...
IEEE 802.11p is a new standard to support intelligent transport system (ITS) applications which is an approved amendment to the IEEE 802.11a standard to add wireless access in vehicular environments. Timing synchronization is studied a lot for IEEE 802.11a, but for IEEE 802.11p, there is few literature. Therefore, a new method is put forward and the characteristics of the timing synchronization samples...
With the rapid development of wireless communication technology, the wired automatic meter reading system is gradually replaced by the wireless one. In this paper, a new kind of wireless automatic reading system based on digital image processing technology, ZigBee and 3G network is proposed. This design mainly aims to apply in residential buildings or areas, and it uses digital image processing technology...
This paper proposes an incremental localization algorithm in wireless sensor network based on the estimation of distribution algorithms. In this algorithm, the distances between an unknown node and the anchor nodes are measured, and then samples are chosen in the area in which the unknown node is located possibly. Thus, the high accuracy samples selection is based on the calculated fitness, and the...
In wireless sensor network, sensory readings are often noisy due to the imprecision of measuring hardware and the disturbance of deployment environment, so it is often inaccurate if we use individual sensor readings to answer queries. In this paper, we consider a useful application of sensor network: maximum average value region query. This query returns the region with the maximum average value among...
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