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11	On spectrum sensing, resource allocation, and medium access control in cognitive radio networks Karaputugala Gamacharige, Madushan Thilina 12 1900 (has links) The cognitive radio-based wireless networks have been proposed as a promising technology to improve the utilization of the radio spectrum through opportunistic spectrum access. In this context, the cognitive radios opportunistically access the spectrum which is licensed to primary users when the primary user transmission is detected to be absent. For opportunistic spectrum access, the cognitive radios should sense the radio environment and allocate the spectrum and power based on the sensing results. To this end, in this thesis, I develop a novel cooperative spectrum sensing scheme for cognitive radio networks (CRNs) based on machine learning techniques which are used for pattern classification. In this regard, unsupervised and supervised learning-based classification techniques are implemented for cooperative spectrum sensing. Secondly, I propose a novel joint channel and power allocation scheme for downlink transmission in cellular CRNs. I formulate the downlink resource allocation problem as a generalized spectral-footprint minimization problem. The channel assignment problem for secondary users is solved by applying a modified Hungarian algorithm while the power allocation subproblem is solved by using Lagrangian technique. Specifically, I propose a low-complexity modified Hungarian algorithm for subchannel allocation which exploits the local information in the cost matrix. Finally, I propose a novel dynamic common control channel-based medium access control (MAC) protocol for CRNs. Specifically, unlike the traditional dedicated control channel-based MAC protocols, the proposed MAC protocol eliminates the requirement of a dedicated channel for control information exchange. / October 2015 Cognitive radio networks Resource allocation Medium access control MAC protocol Spectrum sensing Machine learning Dynamic common control channel OFDMA Multiuser cellular
12	First Principles-Based Interatomic Potentials for Modeling the Body-Centered Cubic Metals V, Nb, Ta, Mo, and W Fellinger, Michael Richard 23 July 2013 (has links) No description available. Physics classical interatomic potential EAM embedded atom method MEAM modified embedded atom method bcc body centered metals V vanadium Nb niobium Ta tantalum Mo molybdenum W tungsten DFT ab initio first-principles modeling force matching

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On spectrum sensing, resource allocation, and medium access control in cognitive radio networks

First Principles-Based Interatomic Potentials for Modeling the Body-Centered Cubic Metals V, Nb, Ta, Mo, and W