5 research outputs found

    Advanced Trends in Wireless Communications

    Get PDF
    Physical limitations on wireless communication channels impose huge challenges to reliable communication. Bandwidth limitations, propagation loss, noise and interference make the wireless channel a narrow pipe that does not readily accommodate rapid flow of data. Thus, researches aim to design systems that are suitable to operate in such channels, in order to have high performance quality of service. Also, the mobility of the communication systems requires further investigations to reduce the complexity and the power consumption of the receiver. This book aims to provide highlights of the current research in the field of wireless communications. The subjects discussed are very valuable to communication researchers rather than researchers in the wireless related areas. The book chapters cover a wide range of wireless communication topics

    Ultra Short Multiband AM/FM/DAB Active Antennas for Automotive Application

    Get PDF
    The length reduction of rod antennas is nowadays a major concern in the automotive industry. The need for new shorter rods stems from the desire to fulfil the design aesthetics of modern cars and to alleviate the mechanical issues the longer rods have. However, despite the severe length reduction, the short rods have to perform at least as good as the 40 cm long active monopoles usually met nowadays. In this context, the present thesis investigates the possibilities to use for AM, FM and DAB broadcast reception in an automotive environment 20 cm long active monopole antennas and 14 cm long active helical elements. Electrically very short active antennas are challenging because the very low effective height of the antenna element and its inconvenient antenna impedance with a highly reactive character pose important constrains upon the antenna amplifier. The amplifier has to have high input impedance, which has to be increasingly higher, as the antenna impedance gets also higher. At the same time, the amplifier has to exhibit enough gain and low noise character, in order to achieve good sensitivity. There are also important requirements to be fulfilled concerning its linearity

    Modern Telemetry

    Get PDF
    Telemetry is based on knowledge of various disciplines like Electronics, Measurement, Control and Communication along with their combination. This fact leads to a need of studying and understanding of these principles before the usage of Telemetry on selected problem solving. Spending time is however many times returned in form of obtained data or knowledge which telemetry system can provide. Usage of telemetry can be found in many areas from military through biomedical to real medical applications. Modern way to create a wireless sensors remotely connected to central system with artificial intelligence provide many new, sometimes unusual ways to get a knowledge about remote objects behaviour. This book is intended to present some new up to date accesses to telemetry problems solving by use of new sensors conceptions, new wireless transfer or communication techniques, data collection or processing techniques as well as several real use case scenarios describing model examples. Most of book chapters deals with many real cases of telemetry issues which can be used as a cookbooks for your own telemetry related problems

    Space station systems: A bibliography with indexes (supplement 9)

    Get PDF
    This bibliography lists 1,313 reports, articles, and other documents introduced into the NASA scientific and technical information system between January 1, 1989 and June 30, 1989. Its purpose is to provide helpful information to researchers, designers and managers engaged in Space Station technology development and mission design. Coverage includes documents that define major systems and subsystems related to structures and dynamic control, electronics and power supplies, propulsion, and payload integration. In addition, orbital construction methods, servicing and support requirements, procedures and operations, and missions for the current and future Space Station are included

    Shortest Route at Dynamic Location with Node Combination-Dijkstra Algorithm

    Get PDF
    Abstract— Online transportation has become a basic requirement of the general public in support of all activities to go to work, school or vacation to the sights. Public transportation services compete to provide the best service so that consumers feel comfortable using the services offered, so that all activities are noticed, one of them is the search for the shortest route in picking the buyer or delivering to the destination. Node Combination method can minimize memory usage and this methode is more optimal when compared to A* and Ant Colony in the shortest route search like Dijkstra algorithm, but can’t store the history node that has been passed. Therefore, using node combination algorithm is very good in searching the shortest distance is not the shortest route. This paper is structured to modify the node combination algorithm to solve the problem of finding the shortest route at the dynamic location obtained from the transport fleet by displaying the nodes that have the shortest distance and will be implemented in the geographic information system in the form of map to facilitate the use of the system. Keywords— Shortest Path, Algorithm Dijkstra, Node Combination, Dynamic Location (key words
    corecore