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A method for detecting human motion in complex scenarios based on Channel State Information (CSI) is presented. First, the sensitivity of CSI phase information to human motion is explored, especially to the strenuous motion. Through a large number of experiments, the influence of human motion on CSI phase is found out, and the characteristics of signal changes are extracted. The One-class Support...
WiFi signals based applications, such as indoor localization, human activity recognition and trace tracking, have been increasing attention in the past decade. WiFi signals are sensitive to the change of indoor environment, so the above mentioned applications encounter challenges which contain dynamic indoor environment, device diversity and motion influence. We mainly survey techniques of motion...
With the rapid development of Location Based Service (LBS) applications and the continual improvement of intelligent terminal technology, study on smartphone-based indoor positioning approach has turned to be the hot topic quickly in recent years. In this paper, a WiFi-assisted Pedestrian Dead Reckoning (PDR) algorithm based on activity recognition is proposed on the smartphone platform to realize...
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...
This paper proposes to detect event coverage and determines event sources. Generally, an appropriate sensor node is selected as the relay node for gathering and routing sensory data to sink node(s). When sensory data are collected at sink node(s), the event coverage is detected and represented as a weighted graph. Event sources are determined which correspond to the barycenters in this graph. Experiments...
In this paper, we propose an Error Tolerant Dual-Hydrophone Localization method, i.e., ET-DHL, in underwater sensor networks (USNs). To reduce the impact of the node uncertainty, measurement uncertainty, poor link quality and long latency for underwater localization problem, ET-DHL adds bit-level probability to process the binary sequence. Different from our previous work PCM, each dual-hydrophone...
After wormhole attacks the routing mechanism of wireless sensor network (WSN) is damaged, then the hop count and distance between nodes cannot be well matched, so that the WSN becomes the anisotropic sensor network, resulting in security treats for WSN. Considering that wormhole attacks can cause the changing of node connectivity, through the theoretical analysis and derivation, the paper has proposed...
In recent years, issues of Wireless Sensor Networks (WSNs) have been widely studied. The energy is limited in WSNs. However, it always takes much energy to achieve highly accurate time synchronization. In this paper, a Spanning Tree-based Energy-efficient Time Synchronization (STETS) strategy for WSNs is proposed. In STETS, only a small number of sensor nodes in the WSN have the privilege to send...
Restricted by finite battery energy, traditional wireless sensor networks (WSNs) can only maintain for a limited period of time, resulting in serious performance bottleneck in long-term deployment of WSN. Fortunately, the advancement in the wireless energy transfer technology provides a potential to free WSNs from limited energy supply and remain perpetual operational. A mobile charger called wireless...
Energy consumption has always been a hot research topic in wireless sensor networks, in this paper, a novel energy-saving routing protocol based on two-layers routing mechanism is proposed, in which, the first layer adopts the remaining energy centroid algorithm to form clusters and elect the cluster heads, and the second layer adopts multi-hop transmission to guarantee that the cluster heads can...
With the development of Internet of Things (IoT), bridging wireless sensor networks (WSNs) and other networks has become important. We divide bridging solutions into two categories: hardware solutions and middleware solutions. Hardware solutions have both low power short distance wireless interfaces and other types of transmission interfaces, e.g. GPRS, 3G/4G, via hardware implementations. This kind...
In wireless body sensor networks (WBSN) and wireless body area networks (WBAN), sensor nodes have different bandwidth requirements, therefore, heterogeneous traffic is created. In this paper, we propose a statistical medium access control (MAC) protocol with periodic synchronization for use in heterogeneous traffic networks based on human body communication (HBC). The MAC protocol is designated to...
The design and analysis of routing algorithm is an important issue in Wireless Sensor Networks (WSNs). Most traditional geographical routing algorithms cannot achieve good performance in duty-cycled networks. In this paper, we propose a k-connected overlapping clustering approach with energy awareness, namely k-OCHE, for routing in WSNs. The basic idea of this approach is to select a cluster head...
Sensors and smart phones have been widely used in various applications. Smart phone peripherals like HiJack platform suggest a growing interest in using headset port to access WSN conveniently and efficiently. However, HiJack interface only offers 8,820 baud using a Manchester-encoded communication which is much lower than that of ZigBee. The imbalance of throughput may cause transmission loss and...
In this paper1, we present the architecture, design, and simulation of an intelligent system for Temperature Monitoring used in metropolitan heating. The system consists of several TelosB-compatible motes, a Nokia uSDCard, and a smart phone. We use TelosB Motes to collect temperature data, and to transport the data to the smart phone. The uSDCard, as the middle layer, connects the smart phone with...
In this paper, an innovative design of a miniaturized heterogeneous 3DIC-based wireless sensor node (WSN) is proposed. The design contains stacks of radio frequency (RF) die, mixed-signal die, digital die, and integrated antenna die using the through silicon via (TSV) technology. Significant enhancements to the existing 2D design and verification flow are developed to solve the critical concerns of...
To suit the needs of data collection, routing protocols in WSN are normally required to form a collection tree where data flows from the source nodes to the sink nodes. These protocols, such as CTP and Multihop LQI, generally target at reducing the packet delivery cost without considering load balancing issues. We argue that load balancing is crucial for WSNs because load imbalance may cause certain...
Trend of accelerated aging society increases need of care for the aged at home. To fit this need, we designed the continuous body posture monitoring system based on wireless sensor networks. The hardware platform is made up of anchor nodes, the central control node and wireless sensor nodes which include the three axis low-g accelerometer MMA7260, 2-axis magnetic sensor HMC5883L and CC2431 System-on-Chip...
Focusing on achieving better geographic routing performance of the two-phase geographic greedy forwarding (TPGF) in duty-cycled wireless sensor networks (WSNs) when there is a mobile sink, this paper proposes a geographic distance based connected-k neighborhood (GCKN) algorithm. The algorithm analysis and simulation results show that GCKN can obtain shorter length of the transmission paths explored...
It is foreseeable that in the near future any object will have an Internet connection - this is the Internet of Things vision. All these objects will be able to exchange and process information and all information will be accessible from Internet. Some of these objects, with wireless support, are characterized by small size, power constrains and small computing resources. Connecting such devices to...
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