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Signal classification plays an important role in spectrum sensing for cognitive radios to identify and avoid interference from other wireless devices. In this paper, we study a network of cognitive radios that jointly perform signal classification via cooperation. We propose a simple but effective linear cooperation scheme to fuse pre-processed measurements collected from spatially distributed cognitive...
Time synchronization is one of the key technologies in Industrial Wireless Sensor Networks (IWSNs). Considering the demand of low energy consumption, fast convergence and robustness for IWSNs, this paper presents a novel Cluster-based Maximum consensus Time Synchronization method. Based on the theory of distributed consensus, the method utilizes the maximum consensus approach to realize the intra-...
In This paper we proposed an improved routing metrics for wireless sensor networks (WSNs) based on Hybrid Energy Storage System (HESS) which merges Super capacitor (SC) and a Rechargeable Battery (RB). The proposed routing scheme assigns different metrics considering not only residual energy, harvesting rates and expected path length of next hop, but also the potential of the future hops. Simulations...
In this paper, we formulate coverage requirements of the sensor network as a minimum-cost connectivity guaranteed point k-coverage problem. An improved ant colony algorithm (EasiDesign) is proposed to achieve the approximate solution to this optimization problem. We made modifications in the convergence strategy and the ant state transition rule of the general ant colony optimization. Considering...
Wireless sensor networks are often deployed in hostile and unattended environments. Then two important problems for key management are presented. First, how to establish the encryption keys among sensor nodes to ensure the security of the network applications. Second, how to avoid the key being obtained especially the sensor be captured. In this paper, we proposed a novel key management method based...
Nowadays, the harmful blue-green algae blooms on lakes or streams threaten the daily life of millions of people in China. In this paper, we demonstrate the sensor network system we built on Lake Tai for the surveillance and cleanup of the algae blooms which is at work in Wuxi City, Jiangsu Province. We designed the sensor device and algorithm to monitor the algae bloom and estimate the bloom area...
The IEEE802.15.4 is a low-bit-rate wireless communicate standard that enables global inter-connectivity and inter-operability amongst Wireless Personal Area Network (WPAN) transceivers from different manufacturers. It is also considered as the PHY and MAC technology for Wireless Sensor Networks, which can be widely used for sensing, gathering and operating information in future smart cities. In Jan...
Key management is one of the most important issues of any secure communication. With the increasing demand for the transmission security in wireless sensor networks (WSNs), it is urgent to introduce the secure and reliable key management scheme into the WSNs. In this paper, we proposed a hierarchical key management scheme to ensure the security of the network services and applications in WSNs. Comparing...
Deployment is an important issue in wireless sensor networks (WSNs). Most of recent researches focus on the full-coverage deployment with the minimum number of sensors. In practice, there are finite number of nodes in WSNs applications, and many regions are too vast to be monitored by the limited number of sensors; On the other hand, the information that we are interested unevenly distributed in the...
Delivering the packets on an end-to-end reliable path with high efficiency in wireless sensor networks is challenging because of the highly dynamic and unpredictable bursty wireless links. In this paper, we describe a burst-link-aware routing protocol, called BLAR, for wireless sensor networks, which has three salient features. First, it discusses the impact of bursty links on routing protocol performance,...
Connectivity of wireless sensor network node has been a topic of active research in recent years. Network connectivity has been shown to be effective with respect to increasing localization performance via redundant nodes. In building sparse distribution of sensor nodes, multi-hop routing is traditionally approach to transmission information from a source node to a destination node. A disadvantage...
In a realistic sensor network, in particular with a non-uniform deployment, sensor nodes inevitably have varying workloads. This causes a natural problem that some sensor nodes are subject to excessive power consumption and thus become hot. These hot nodes deplete much earlier resulting in system performance degradation. This paper proposes a systematic approach to design a hotness-aware sensor network...
This paper presents an overview of our demonstration of a real application of a WSN system for relic protection applied in the Forbidden City of China. We briefly introduce the EasiNet hardware platform we have developed and the corresponding mesh-architecture of the system constructed. We present a sensor deployment optimization tool based on ant colony optimization technology (DT-ACO) to meet the...
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