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Directional antenna offers various benefits for wireless sensor networks, such as increased spatial reuse ratio and reduced energy consumption. Numerous localization schemes using anchor nodes equipped with omni-directional antenna to transmit beacon information have been proposed. However, the radiated RF signal from an omni-directional antenna is easier(More)
Localization is one of the crucial issues in wireless sensor networks. In range-based mechanisms, the nodes obtain pairwise distances or angles with extra hardware for high localization accuracy. On the other hand, the range-free schemes obtain lower localization accuracy at low hardware cost. To improve location accuracy, we present a three dimensional(More)
In this paper, we present an improved localization algorithm for wireless sensor network using a mobile anchor node which is equipped with a GPS receiver to obtain its position. The mobile anchor node moves around in a sensor area to broadcast beacon messages which include its location information. Each stationary sensor node takes the position as a beacon(More)
Wireless sensor networks (WSNs) are a large ad hoc networks of distributed sensors that are equipped with low power supply modules. Location information is a basic requirement for many WSNs applications. Because localization accuracy is sufficient for many sensor network applications, range free localization schemes based on RSSI technique are being pursed(More)
In this paper, we present an energy efficient localization algorithm for wireless sensor networks using a mobile anchor node. It is based on the distance measurement with extra hardware. The mobile node is equipped with a GPS receiver, RF (radio frequency) and ultrasonic transmitter. Each stationary sensor node is equipped with a RF and ultrasonic receiver.(More)
Directed diffusion is a classic data-centric routing protocol in Wireless Sensor Networks (WSNs). In directed diffusion based WSNs, data generated by sensor nodes is named by attribute-value pairs. A sink requests data by sending interests. The data that match the interests are then "drawn" down towards the sink. Intermediate nodes cache or transform data,(More)
Localization is one of the crucial issues in wireless sensor networks. In range-based mechanisms, the nodes obtain pairwise distances or angles with extra hardware for high localization accuracy. On the other hand, the range-free schemes obtain the lower localization accuracy at low hardware cost. We present a range-free localization scheme by using a(More)
Large-scale wireless sensor networks have been used for a wide range of applications, one of the most important issues in these applications is how to improve network lifetime of the sensor node powered by battery. In this paper, we propose a novel data collection algorithm using compressive sensing. The network energy consumption is analyzed theoretically.(More)