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This study proposes H2 and H∞ robust controllers to be applied to a DC-DC boost converter operates in the continuous conduction mode (CCM) in a DC microgrid system. Towards this end, the DC-DC boost converter is modelled based on the state-space averaging method with possible uncertainty in its parameters and also considerable variation in the input voltage. By deriving the open loop perturbed transfer...
Underlay device-to-device (D2D) communication is envisaged to improve the spectral efficiency in cellular networks. One main challenge in this technology is how to control transmit powers from D2D pairs in order to preserve a certain quality of service requirement for cellular users. To address this challenge, this paper proposes a price-based power control game, by which transmit power of D2D pairs...
Scheduling courses in university is an important matter in all academic institutes across the world. Scheduling courses, students, and class rooms without any crash is the main aim of university course time tabling problem. This problem is categorized as a NP-hard problem. The proposed algorithm is firstly based on a genetic grouping approach to generate feasible solutions. In the second step, an...
In this paper, we present an integrated hardware design and software implementation for a cognitive-radio wireless sensor network (CR-WSN). The implemented CR-WSN is an event-driven cluster-based network, where the sensor nodes in the network are organized into a two-level hierarchy of clusters, each with its own cognitive-enabled cluster-head (CR-CH). According to CR-WSN, the sensed data by a sensor...
We consider Energy efficient multiple access control protocol in wireless sensor networks. With the perspective of a synchronous and schedule access protocol, an optimization problem is formulated to schedule operation modes (transmit, receive and sleep) throughout the network. Using dual decomposition, a protocol is designed collaboratively by sensor nodes over time, each node determines its own...
We consider the joint allocation of receiver, bit, and power to subcarriers in the downlink of multicell orthogonal frequency-division multiple-access (OFDMA) networks. Assuming that the cells share the entire bandwidth and that the rates are discrete, we formulate the joint allocation problem as a nonlinear mixed integer program (MIP), which however has exponential worst-case complexity. We capitalize...
We address the problem of subcarrier sharing with discrete rate allocation in the downlink of multihop OFDMA networks. The co-channel interference makes the problem computationally intractable. We therefore model the problem as a non-cooperative game among the transmitting nodes with smaller scale problems. Each problem is solved using dual decomposition. Moreover, to mitigate the degradation effect...
Energy consumption scheduling to achieve a low power generation cost and a low peak-to-average ratio load is a critical component in the next generation of power systems, known as smart grids. Implementing such a component requires the knowledge of the whole power demand throughout the system. However, due to the diversity of power demands, this requirement is not always satisfied in practical scenarios...
In this paper, a hybrid power generation system suitable for Remote Island located in Alaska application is proposed. This system consists of two renewable energy sources, namely wind turbine and fuel cell. Also it is consist of diesel generator and battery. For the production and uniform supply of hydrogen for fuel cell, and electrolyzer and a reformer are also considered in the proposed system....
The focus of this paper is on joint channel-aware and queue-aware scheduling schemes for the downlink of Orthogonal Frequency Division Multiple Access (OFDMA) networks. The objective is to enhance the stability of the queues while improving the network throughput. For this purpose, a Multi-Carrier Opportunistic Stable Queue (MC-OSQ) scheduling scheme is proposed, and a multi-carrier Modified Largest...
An array of polymer microlenses, made of 32×32 individual elements spaced by a 50-∞m pitch, is used in connection to an array of 32×32 6-∞m diameter SPADs (Single Photon Avalanche Detector), with the aim of mitigating the loss in sensitivity due to the area fill-factor. The lens array is fabricated by polymer casting in a photoresist replica mold. Results about repeatability of concentration factor...
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