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 12 of 12 for “"Adaptive antennas"”.
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Resource Allocation and Adaptive Antennas in Cellular Communications
… for mitigating co-channel interference, such as adaptive antennas and power control. Also, by allocating transmitter power and communication channels efficiently (resource allocation), overall co-channel interference can be maintained below a desired maximum tolerable level, while maximizing the …
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Analysis of CDMA cellular radio systems employing adaptive antennas
… (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 radio systems. …
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Analysis and Development of Blind Adaptive Beamforming Algorithms
… for the development and analysis of blind adaptive algorithms. An adaptive algorithm is said to be 'blind' if it does not require a known training sequence. The main focus is on application of these algorithms to adaptive antenna arrays in mobile radio communications. Adaptive antenna …
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Rim-Mounted Reconfigurable Surfaces for Interference Nulling in Focus-Fed Axisymmetric Reflector Antenna Systems
This thesis addresses the use of an electronic reconfigurable surface (ERS) attached to an axisymmetric paraboloidal reflector antenna to mitigate interference through nulling for radio astronomy applications. The ERS is a reflectarray that consists of multiple elements, which can be electronically …
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Adaptive antenna systems for mobile broadband communications
… thrust in wireless communications is the use of adaptive antennas at the transceivers, along with the associated advanced array signal processing, to improve cell coverage, link quality and system capacity. This dissertation first provides a framework of adaptive antenna systems for wireless …
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Simulation of Adaptive Array Algorithms for CDMA Systems
… to improve spectrum utilization. The CDMA and adaptive antenna array are two approaches that shows real promise for increasing spectrum efficiency. In this research, we investigate the performance of different blind adaptive array algorithms in the CDMA systems. Two novel algorithms, …
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Contribution to the characterization and evaluation of multiple antenna systems for communications: prototyping, propagation and antenna perspective
… systems that are based on the use of multiple antennas to take advantage of the available spatial diversity in the channel. Moreover, current open issues and problems that prevent multi-antenna systems from being widely adopted have been thoroughly analysed, with special emphasis on real …
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Simulation of Adaptive Array Algorithms for OFDM and Adaptive Vector OFDM Systems
… intersymbol interference (ISI). Deploying an adaptive antenna array at the receiver can help separate the desired signal from interfering signals which originate from different spatial locations. This enhancement of signal integrity increases system capacity. In this research, we apply …
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Neural network field programmable gate array (FPGA) controllers for reconfigurable antennas
Advantages of reconfigurable antennas are numerous, but limited by the method of controlling their configuration. This dissertation proposes to utilize the advantages of both Neural Networks (NN) and Field Programmable Gate Arrays (FPGAs) to overcome this dilemma. In this work, the methodology of …
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Integrated broadband microphotonic beamformer for adaptive nulling in smart antennas
… rates for wireless communication systems. Smart antennas are the promising technology for improving the wireless communication systems performance. Smart antennas are system that consist of antenna arrays capable of adaptively adjusting the beam pattern, thereby enhancing the desired signals …
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Design And Analysis Of Adaptive And Reconfigurable Antennas For Wireless Communication
… a tremendous increase in the number of antennas onboard, on the ground, and in orbital space. This places a burden due to the confined volume and limited weight requirements especially in space applications. The reconfigurable antenna is a promising and exciting new type of antenna, …