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Air quality is an essential factor to assess the health and life quality of people. However, air pollution has become an acute problem in major cities of developing countries due to the rapid industrialization and poor handling of air pollutants. In this scenario, air quality monitoring practices have been scarcely implemented largely because of the relatively high cost and technical complexity of...
This paper presents a transmitter design for Ultra Wideband Impulse Radio (UWB-IR) communications. The design is targeted towards the implementation of passive Wireless Sensor Tags (WST) where micro-power consumption is required. The transmitter has been implemented in UMC 0.18μm CMOS and placed inside a QFN lead-less package. It complies with the FCC regulations for Pulse Rate Frequencies (PRF) up...
This paper presents a simple and distributed clustering algorithm suitable for large-scale wireless sensor networks (WSNs) consisting of several thousands of sensor nodes and few sink nodes. A two-tiered hierarchical architecture is used to increase scalability and ensure performances and durability of such a system: Level 1 called sensor network is partitioned into several equilibrate clusters with...
Since sensor nodes are energy constrained devices, optimizing the energy efficiency of wireless sensor networks (WSNs) is a key issue. In this paper we present a new, simple and easy to implement protocol to reduce the energy consumption of nodes. The purpose of the proposed algorithm is to monitor the transmission power of sensor nodes while communicating. The algorithm has been studied, analyzed...
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