Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 16 of 16 for “"cellular telephones"”.
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Usability Evaluation of Notebook Computers and Cellular Telephones Among Users with Visual and Upper Extremity Disabilities
… appliances such as notebook computers and cellular telephones are becoming integral to the lives of many. These devices facilitate a variety of communication tasks, and are used for employment, education, and entertainment. Those with disabilities, however, have limited access to these …
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An Application Layer Framework for Location- based Service Discovery and Provisioning for Mobile Devices
… Wireless Application Protocol (WAP) services for cellular telephones. Such services include electronic mail, printing, fax delivery, and weather reports. But, current services are limited both in type and nature. Today, mobile telephone users need access to more dynamic, location-based, …
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Feasibility of Spectrum Sharing Between Airborne Weather Radar and Wireless Local Area Networks
… such as wireless local area networks and cellular telephones have dramatically increased the use of wireless communications services within the last 10 years. The shortage of available spectrum exists due to increasing demand for wireless services and current spectrum allocation …
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Effect of varying gate-drain distance on the RF power performance of pseudomorphic high electron mobility transistors
… communications, military and commercial radar, cellular telephones, and other RF power applications. One key figure of merit in these applications is RF power output. Increasing the gate-to-drain length (LRD) of the PHEMT leads to an increase in its breakdown voltage. This should theoretically …
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A Spatial Decision Support System for Planning Broadband, Fixed Wireless Telecommunication Networks
… devices such as AM/FM radios, cordless and cellular telephones, pagers, satellite televisions, garage door openers, and television channel changers are just some of the applications of wireless technology. More recently, wireless computer networking has seen increasing employment. A few …
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Propagation prediction for PCS design in urban microwave channels
The increasing demand for greater capacity of mobile communications has led to the petition of more radio spectrum at 1900 MHz for the new personal communication service (PCS) systems. The PCS spectrum is proposed to coexist with current fixed microwave spectrum. This presents cochannel …
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Microwave multipath resolution in microcellular channels
… scattering of radio propagation in typical microcellular environments. As a first step in this endeavor, building surface characterizations are made in order to determine empirical reflection coefficients of common building materials. Propagation experiments have been designed to determine …
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Software for site specific propagation prediction
The design of cellular wireless communication systems is influenced by the propagation characteristics of the channel and their effect on transmitted signals. The multipath propagation characteristics of a channel, except under simple transmission conditions, limits the design of emerging cellular …
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A multistage RAKE receiver for CDMA systems
… of a Code Division Multiple Access (CDMA) cellular communications system. This receiver combines the interference rejection capability of multiuser receivers with the robust performance of a RAKE receiver in the presence of multipath interference. Unlike previous multiuser receiver designs, …
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A Framework for Evaluating the Computational Aspects of Mobile Phones
… computers, Personal Data Assistants (PDAs) and cellular telephones makes this a key concern. The power consumption factors associated with operation are therefore considered alongside the three core criteria being studied in this framework. In addition to framework design, software tools for the …
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Diode Predistortion Linearization for Power Amplifier RFICs in Digital Radios
… use of portable and handheld devices such as cellular telephones, personal digital assistants (PDAs), and wireless networks. This trend presents the need for compact and power efficient radio systems. Typically, the most power inefficient device in a radio system is the power amplifier (PA). …
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Citizen Jane : exploring the relationship between gender and cellular phones in societies of control
… between women (as gendered subjects) and cellular phone technology is one of control. Women use cellular phones to organize, manage and otherwise control the multiplicity of tasks required of them on a daily basis. At the same time, through using cell phones, women participate in regimes …
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Factors influencing customer churn rate and retention in the mobile market
Dissertation submitted in compliance with the requirements for the Master's Degree in Technology: Business Administration, Durban University of Technology, Durban, South Africa, 2008.
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The use of cellular technologies by students at the University of Zululand
… study begins by investigating the development of cellular technology as within the overall convergence of Information and Communication Technologies (ICT's). The study briefly sketches its scope and extent in South Africa and the African continent. It examines the various communication functions …