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 20 of 64 for “"Radio Systems"”.
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Noise blanker for land mobile radio systems
The field of private mobile radio systems (taxis, police, emergency services, dispatch systems etc.) is undergoing accelerated change and deregulation. More users, demanding more services with better quality, are squeezed into the same bandwidth. However, noise and impulsive noise levels on the …
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Dynamic resource allocation for cognitive radio systems
Cognitive Radio (CR) is considered to be a novel approach to improve the underutilization of precious radio resources by exploiting the unused licensed spectrum in dynamically changing environments. Designing efficient resource allocation algorithms for dynamic spectrum sharing and for power …
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Precoder Design for Cooperative Cognitive Radio Systems
Cognitive radio (CR) has been an active area of research in wireless communication in recent years. In this thesis, optimal transmission strategies at the source and relay nodes in cooperative underlay CR systems assumption are studied with an aim of achieving maximum possible throughput for the …
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Interference Control of Indoor Cognitive Radio Systems
… the re-use occurs inside a building that shields radio signals and re- duces interference to the primary system. However buildings typically do not have equal radio shielding ability. The SUs will be required to adjust their transmit powers according to their locations in the building in order to …
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Analysis and simulation of army tactical radio systems
… of a Single Channel Ground and Airborne Radio System (SINCGARS), currently in use by the United States Army. Although this radio was mainly designed as a voice radio, it also has the capability to transmit data messages. The amount of voice traffic which is capable of flowing through the …
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Threat and Application of Frequency-Agile Radio Systems
As traditional wireless systems that only operate on fixed frequency bands are reaching their capacity limits, advanced frequency-agile radio systems are developed for more efficient spectrum utilization. For example, white space radios dynamically leverage locally unused TV channels to provide …
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Cognitive Radio Systems: Performance Analysis and Optimal Resource Allocation
… led to the analysis and development of cognitive radio systems. Cognitive radio systems provide dynamic and more efficient utilization of the available spectrum by allowing unlicensed users (i.e., cognitive or secondary users) to access the frequency bands allocated to the licensed users (i.e., …
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Analysis of CDMA cellular radio systems employing adaptive antennas
… Multiple Access (CDMA) cellular communication systems employing adaptive antennas at the base station. First, a simple analysis is presented which shows that significant improvements in performance can be obtained by using directional antennas in the mobile-to-base station link of CDMA cellular …
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Analysis and simulation of computer controlled cellular mobile radio systems
Cellular mobile radio systems will be of increasing importance in the future. This thesis describes research work concerned with the teletraffic capacity and the canputer control requirements of such systems. The work involves theoretical analysis and experimental investigations using digital …
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Digitally Assisted Transmitter Enhancement Techniques for Millimeter Wave Radio Systems
… The data to be transmitted is modulated on radio frequency carrier signals for transmission where the bandwidth of the signal to be transmitted increases proportional to the speed at which the data is intended to be transmitted. The present generation cellular wireless communication systems …
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Assignment of Spreading Codes in Code Division Multiple Access Radio Systems
… in Direct Sequence Code Division Multiple Access radio systems. Particular emphasis is given to Quasi-Synchronous Code Division Multiple Access. The frequency spectrum required for these systems depends on the length of the spreading code used. Frequency spectrum is an important and expensive …
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A Defense-In-Depth Security Architecture for Software Defined Radio Systems
Modern wireless communications systems are constantly evolving and growing more complex. Recently, there has been a shift towards software defined radios due to the flexibility soft- ware implementations provide. This enables an easier development process, longer product lifetimes, and better …
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Digital Hardware Design Decisions and Trade-offs for Software Radio Systems
Software radio is a technique for implementing reconfigurable radio systems using a combination of various circuit elements and digital hardware. By implementing radio functions in software, a flexible radio can be created that is capable of performing a variety of functions at different times. …
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Investigation of a Packet-Switched Inter-System Interface for Land Mobile Radio Systems
Traditionally, and up to this date, Land Mobile Radio (LMR) systems have been interconnected via leased lines and microwave links across circuit-switched networks. With the recent deployment of digital LMR standards such as the Association of Public and Communications Officials (APCO) Project 25 …
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The optimization of multiple antenna broadband wireless communications. A study of propagation, space-time coding and spatial envelope correlation in Multiple Input, Multiple Output radio systems
… for a commercial dual band 802.11n MIMO radio operating indoors in a variety of line of sight and non-line of sight scenarios. The physical model of the space is based on architectural schematics, and realistic propagation data for the construction materials. The modelling is then …
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Adaptive Coded Modulation Classification and Spectrum Sensing for Cognitive Radio Systems. Adaptive Coded Modulation Techniques for Cognitive Radio Using Kalman Filter and Interacting Multiple Model Methods
… future trends of modern wireless communication systems place heavy demands on fast data transmissions in order to satisfy end users’ requirements anytime, anywhere. Such demands are obvious in recent applications such as smart phones, long term evolution (LTE), 4 & 5 Generations (4G & 5G), and …
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Building a Dynamic Spectrum Access Smart Radio With Application to Public Safety Disaster Communications
… the limitations of current mobile communication systems for public safety first responders. First, in a point-to-point configuration, legacy radio systems used by first responders from differing agencies are often made by competing manufacturers and may use incompatible waveforms or channels. In …
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A day in the life of the RF spectrum
… to modernize this strategy. Given advances in radio technology that can lead to fully cooperative broadcast, relay, and reception designs, we begin by studying the existing radio environment in a qualitative manner. We wish to objectively understand the purpose of a particular transmission, its …
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A Novel Variable Inductor-Based VCO Design with 17% Frequency Tuning Range for IEEE 802.11AD Applications
… (TR) limitation of the IEEE 802.11ad compliant radio systems. The IEEE 802.11ad standard has drawn strong attention from the industry as the next generation affordable multi-gigabit speed wireless communication standard. Prepared for the global market, IEEE 802.11ad compliant systems are …
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