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This paper describes the application of a simplified indirect model predictive current control strategy for a direct Matrix Converter. The direct matrix converter has a large number of available switching states which implies that the implementation of predictive control high computational cost. In this paper, a predictive current control strategy is proposed in order to simplify the computational...
Recently the class of (…)-perfectly continuous functions between topological spaces has been introduced and studied in some detail. In this paper we consider this class of functions from the point of view of change of topology. In particular, we demonstrate that the concept of (…)-perfect continuity coincides with the notion of perfect continuity when the codomain of the function under consideration...
In this paper, we study a simple medium access control protocol based on the definitions and basics of the medium access control protocol described in by Sharma et al. Additionally, its performance under various parameters in a system composed of a single secondary user and a primary frequency band is analyzed.
In this study, control of standalone doubly-fed induction generator (DFIG), mainly used at wind turbine, has been realized by using direct voltage control scheme. In the study standalone DFIG driven by an induction-machine (IM) has been used. The IM has been rotated at sub-synchronous and super-synchronous speeds by using an inverter. Rotor circuit's power has been controlled by a rotor side converter...
In this study, microcontroller based nuts conveyor belt has been realized as design and application to be used on industrial facilities. Designed conveyor belt contains measuring circuit, zero crossing detection circuit, AC/DC converter circuit, thristor and driving circuit, microcontroller circuit and electromagnet. The amplitude of the voltage applied to electromagnet is adjusted by a microcontroller...
In this paper, the use of mobile WiMAX (IEEE 802.16e) as terrestrial multicast/broadcast segment for the delivery of multimedia content to mobile users in DVB-SH networks is investigated. The WiMAX multicast/broadcast services (MBS) protocol stack is defined after a brief description of DVB-SH system specifications and multicast/broadcast services in WiMAX. Consequently, the symbiotic mobile WiMAX...
The rapid growth in wireless technologies has intensified the demand for the radio spectrum. On the other hand, the research studies reveal that the spectrum utilization is unevenly distributed, which leads to the conclusion that there is a problem with the spectrum management and allocation rather than the scarcity of the spectrum itself. This inefficiency in spectrum usage in addition to the escalating...
Spectrum scarcity experienced due to low utilization of some spectrum bands shows that there is a need for new regulations for spectrum allocation. Static allocation over a wide area, usually a city, makes the spectrum use non efficient. In order to use spectrum more efficiently, cognitive radio concept has been introduced. A cognitive radio is a paradigm for wireless communication in which either...
Non-geostationary (NGEO) satellite networks can meet the requirements of next-generation Internet services with high bit rates and much lower latency than geostationary (GEO) systems. However, various characteristics of these systems dissimilar from wired and GEO systems expose some formidable challenges. Dynamic topology of the network and constraints on key system resources such as on-board CPU...
In this study, voice over IP (VoIP) performance in multi-layered satellite IP networks with on-board processing (OBP) capability is investigated. With on-board processing, a satellite can process the received data, and according to the nature of application, it can decide on the transmission properties. Specifically, considered OBP includes error-correcting coding to combat adverse channel conditions...
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