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Wireless energy transfer system tends to replace the battery for the power supply of implantable prosthetic devices. Coils are the key point of the wireless transfer system and affect the transfer efficiency. In this paper, high Q flexible planar-Litz coil is designed and implemented for the wireless energy transfer system. Theoretical model of planar-Litz coil is given and the measurement result...
In this paper, the performance of energy efficiency of cluster-based wireless sensor networks (WSNs) is investigated. We consider the effect of cluster head (CH) and relaying nodes (RN) selection on the energy consumption in WSNs. With the fixed clustering algorithms (FCA), we propose energy efficient minimum mean distance (EEMMD) algorithm and energy efficient relay and minimum distance (EERMD) algorithm...
A brief introduction of passive localization is presented in this paper. With the localization algorithm of wireless sensor networks, a novel algorithm classification is discussed. Outer node passive localization based on wireless sensor networks is analyzed, and a new localization algorithm is designed. The Monte-Carlo simulation experiment results demonstrate that the new algorithm has a better...
This thesis introduces the architectures and characteristics of wireless sensor networks. According to their features and the application scope of each method, it puts forward a new whole design scheme, which adopts software structure based on .net micro framework to accelerate wireless sensor networks development and simplify system complexity. Concepts verification and prototypes system design are...
This paper proposes a novel energy efficient data clustering scheme to improve energy efficiency for cluster-based wireless sensor networks (WSNs). In order to reduce the energy dissipation of transmitting sensing data at each sensor, the fixed clustering algorithm uniformly divides the sensing area into clusters where the cluster head is deployed to the centered of the cluster area. Moreover, to...
In this paper, we investigated designing multicast-capable optical cross-connects (MC-OXCs) on a basis of the 4- stage multicast network. Firstly, we derive the sufficient wide- sense nonblocking (WSNB) and rearrangeable nonblocking (RNB) conditions for the 4-stage multicast network with only two (the second and output) stages being multicast-capable. Both WSNB and RNB 4-stage multicast networks need...
Time synchronization is an important issue in wireless sensor network (WSN). Many applications of wireless sensor networks need local clocks of sensor nodes to be synchronized, requiring various degrees of precision. Some strict resources limitations of WSN make traditional synchronization methods unsuitable for it. Hence there are many synchronization algorithms for sensor networks specially. The...
Wireless sensor networks (WSNs) normally consist of large number of sensing nodes that organize themselves into multi-hop wireless networks. It is desirable for communication protocols to minimize the communication overhead and hence the energy consumption while keeping the data delivery relatively reliable. In this paper, we present a new routing protocol, called cross-layer AODV (CAODV), based on...
Localization of sensor nodes is a challenging and crucial issue in wireless sensor networks (WSNs), and high precision and low cost algorithms become the research direction. In this paper, a robust and accurate localization algorithm based on adjustment of trilateration network (LATN) for WSNs is presented. Firstly, uncomplicated distributed algorithm is used for estimating position of the nodes,...
Since flooding is used for route discovery in on-demand routing protocols in wireless sensor networks, the routing overhead increases obviously, especially in simple flooding. Many routing protocols adopt measures to control flooding overhead but result limited effect. In this paper, a novel on-demand protocol, based MPR flooding, is presented. The protocol reduces the flooding overhead effectively...
Cooperative communication can obtain spatial diversity through the cooperative use of antennas belonging to several wireless nodes. It is also believed to be an energy efficient communication means. In this paper, we give a detailed analysis on the energy issues for a typical cooperative communication model in energy constrained wireless networks such as wireless sensor networks. We find that by carefully...
Data aggregation in wireless sensor networks is widely accepted as an essential paradigm for energy efficient routing but with low reliability under node and link failures. In this paper, we propose a protocol called RDA which associates packet's reliability in data transmission with the amount of information it contains and gives higher reliability to the packet which has more information by adjusting...
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