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Localization is one of the most important technologies in Underwater Wireless Sensor Networks (UWSNs), since it plays a critical role in many applications. As the variable speed of sound and the long propagation delays under water, using the traditional localization algorithms become difficult and impractical in UWSNs. In this paper, a new localization algorithm for UWSNs is presented. By deploying...
Time synchronization has received a great attention as its crucial parts in wireless sensor networks. To minimize the number of transmission packets and achieve energy efficiency, a time synchronization scheme based on ant colony algorithm (TSAC) is presented in this paper. By exploiting the principle of ant colony algorithm adjusting the pheromone dynamically and automatically, an optimum pair selection...
In this letter, we consider a more practical scenario when the primary user (PU) transmits with multiple levels of power in a cognitive radio (CR) network. The optimal spectrum sensing algorithm at the secondary user (SU) that could discriminate the PU's' transmitting power is proposed and the related performance is analyzed. We also designed a new SU transmission strategy where one transmit power...
Although many localization protocols have been proposed for wireless sensor networks in a three dimensional topology, the demand to further improve the accuracy of node positioning method make it necessary to design and develop new localization algorithms. In this paper, a three-dimensional localization algorithm of wireless sensor networks base on particle swarm optimization (TLP) is presented. By...
The measurement and control of water salinity in aquaculture, environmental protection, and marine resource exploitation is crucial. This paper presents wireless method measure water salinity, it mainly analyses the theoretical of the measurements of water salinity, illustrates the effects of temperature on the salinity measurement, and proposes temperature compensation methods to get a more accurate...
The multi-Gbps wireless personal area network (WPAN) using 60-GHz is being standardized in the task group of IEEE 802.15.3c. In the physical (PHY) layer design, there are two competitive techniques, one is orthogonal frequency division multiplexing (OFDM) and the other is single-carrier frequency-domain equalization (SC-FDE), a.k.a., single-carrier block transmission (SCBT). This paper compared the...
Estimating the positions of sensor nodes is a crucial task in many wireless sensor network (WSN) applications. On the ZigBee compatible sensor nodes we have developed, received signal strength indication (RSSI) is adopted as a coarse but simple method of distance estimation. Based on ROCRSSI, we propose a hybrid approach, ring overlapping based on hybrid access of RSSI (ROHA) in this paper. Simulation...
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