Abstract: Pure and Fe+3 doped titanium dioxide thin films were prepared by sol-gel spin coating technique. Phase analysis, crystallite size, dislocation density and toughness of films were scrutinized by X-ray diffraction (XRD). The principal phase in the films was anatase. Crystallite size plummeted from 39.3 to 33.22nm whereas dislocation densities escalated from 6.47 x 10-4 to 9.06 x 10-4(nm)-3 when Fe+3 content rose from 0 to 10%. These mushroomed dislocation densities imparted strength to the films on account of grain boundary strengthening phenomenon. Principal anatase phase of the films was validated by Raman spectroscopy. Minor peak broadening and peak shifting was observed for doped films, that were attributed to the dislocation induced stresses by the rising Fe+3 content. UV-Vis spectrophotometry was undertaken to ascertain the transmittance of films in ultraviolet and visible spectrums. The films exhibited substantial transmittance in the visible region but there was a vivid landslide

• Publication Date: 10-Dec-2017
• DOI: 10.15224/978-1-63248-138-2-07
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Abstract: In this paper, power control problem is studied focusing on interference mitigation by using CoMP (Coordinated Multipoint Transmission) in a downlink, multi-cell cellular distributed antenna systems (DAS). In each cell, there are geographically distributed remote radio heads which have lossless connection to base-stations. There are multiple user equipments (UE) in each cell, and can simultaneously receive and combine signals from multiple RRHs. System-wide throughput is maximized subject to maximum RRH transmission power limit with different Jain Fairness indexes (JFI). Throughput behavior with respect to different maximum RRH transmission power limit and JFIs is investigated. Particle Swarm Optimization PSO), which is an evolutionary algorithm, is used as a solver. Due to not only the non-convexity and non-linearity of the problem, but also having a multi-modal cost surface, solution of the optimization problem may be local optimum. Thanks to PSO, even if for the problems with high c

• Publication Date: 10-Dec-2017
• DOI: 10.15224/978-1-63248-138-2-08
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