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For the energy-constrained cognitive networks, it is particularly important to improve their energy efficiency (EE). We focus on the EE optimization of the continuous spectrum sensing (CSS). The EE of the secondary user (SU) networks is derived. To maximize the EE, an optimization problem is formulated under the constraints of sensing performance. After some theoretical analyses, the detailed processes...
Efficient identification of tags has been an essential operation for Radio Frequency IDentification (RFID) systems. In this paper, we consider the crucial problem of collecting all tags in a large-scale system through a handheld RFID reader. The reader has to move around due to the limited communication range of tags. We focus on the minimization of power consumption of the reader given the constraint...
The IEEE 802.16e mobile WiMAX technology aims to provide with an energy efficient communication platform for various mobile applications. In the standard, the sleep mode feature with three Power Saving Classes (PSCs) is designed to compensate for the power saving as the target. Prior work has shown that the proposed Markov Decision Process (MDP) approach can achieve the optimal performance in terms...
There is a growing interest in using wireless sensor networks for security monitoring in the underground coal mines. In such applications, the sensor nodes are deployed to detect interested events, e.g., the density of certain gas at some locations is higher than the predefined threshold. These events are then reported to the base station outside. Using conventional multi-hop routing for data reporting,...
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