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 157 for “"base stations"”.
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Argos: Practical Base Stations for Large-scale Beamforming
… many antennas (e.g. M >> 10) on wireless base stations to serve many users simultaneously through multi-user beamforming (MUBF). However, realizing such a large-scale design is nontrivial, and has yet to be achieved in the real world. We present the design, realization, and evaluation of …
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A digital signal processing solution for multichannel base stations
… this, cell sizes will reduce and the number of base stations will increase. Current base station architectures use analogue combining techniques which are expensive, voluminous and inflexible. This thesis investigates a Digital Signal Processing (DSP) solution which produces a cheaper, smaller …
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Channelization for Multi-Standard Software-Defined Radio Base Stations
… for multi-standard Software-Defined Radio (SDR) base stations in general and public mobile radio base stations in particular. A comprehensive evaluation of non-uniform channelizers (existing and developed during the course of this work) shows that parallel and recombined variants of the …
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Optimal resource allocation In base stations for mobile wireless communications
… problems under consideration arise when mobile base stations have an Orthogonal Frequency-Division Multiple Access (OFDMA) architecture, where there are subcarriers for data transmission and users with various transmission demands. In such systems, we simultaneously allocate subcarriers to users …
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Superconducting RF front-end filters for cell phone base stations
… the function of front-end filters on cell phone base stations, serving to reject any unnecessary signals, eliminating intermodulation distortion (IMD). Broader geographical coverage and higher calling capacity per tower are other effects of the superconducting filters compared to their dielectric …
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Multi-beam Antenna Arrays for Base Stations in Cellular Communication Systems
… complexity and secondly, a multi-beam antenna based on a spherical Luneburg lens implemented with an artificial dielectric material which is approaching low frequency limitations of excessive size, weight and anisotropy is explored. In the case of Butler matrix networks, control of beamwidth …
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A digital up-conversion architecture for future high efficiency wireless base stations
… of the power requirements of a typical wireless base station. This research is focused on the modulation and up-conversion circuits for generating the SMPA drive signals. The switched (‘on’/‘off’) nature of the amplifier drive signal creates an opportunity for an all-digital solution removing …
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Investigation and Design of New, Efficient and Compact Load Modulation Amplifiers for 5G Base Stations. Design, Simulation, Implementation and Measurements of Radio Frequency Power Amplifiers Using Active Load Modulation Technique for More Compact and Efficient 5G Base Stations Amplifiers
High efficiency is an essential requirement for any system, where the energy can be saved with full retention of system performance. The power amplifier in modern mobile communications system consumes most of the supplied power through the dissipated power and the required cooling systems. However, …
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Capacity Enhancement Approaches for Long Term Evolution networks: Capacity Enhancement-Inspired Self-Organized Networking to Enhance Capacity and Fairness of Traffic in Long Term Evolution Networks by Utilising Dynamic Mobile Base-Stations
… An example of such network involves transceiver base stations (BTSs) within a self-organizing network (SON). Besides these great breakthroughs, the conventional LTE and LTE-Advanced networks have not been designed with the intelligence of scalable capacity output especially in sudden demographic …
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Design and performance of resonant cavities for communication systems. The theory and performance of resonant cavities for application-, in mobile radio and base-stations in the VHF and UHF bands are investigated.
… and receivers simultaneously from the same base station or mobile unit without interference. The best method to achieve this has been found in the use of filters inserted in the transmission line between the antenna and the transmitter(s) on one hand and the receiver(s) on the other hand. …
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DSP implementation of trellis coded modulation and distributed space time coding
… which is the process of using multiple base stations to communicate with a single mobile station. Simulation results are shown for two types of macrodiversity systems, one using two base stations and another using three base stations. For the system that uses three base stations, we …
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Retransmission strategies for moving networks over ricean fading channels
The problem of designing retransmission protocols based on Hybrid Automatic Repeat reQuest (HARQ) for moving networks over Ricean fading channels has been considered. The scenario of interest consists of one receiver traveling at a given speed while connected to a wireless network based on OFDM …
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Locating Unknown Interference Sources with Time Difference of Arrival Estimates
… signals measured at multiple time-synchronized base stations to estimate the time difference of arrival (TDoA) between each pair. Then, we used a TDoA localization algorithm to locate each unknown transmitted signal source. In particular, for POWDER, we applied these methods to estimate the …
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Improvement of position and orientation tracking accuracy by fusing HTC Vive trackers and Inertia Measurement Units
… changes with micrometre accuracy. Vision-based tracking systems such as an OptiTrack Motion Capture system have also been used for navigation, pick-and-place, or less precise machining. The price of the vision-based tracking system is lower than laser trackers, but its performance can …
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Optical generation of mm-wave signals for use in broadband radio over fiber systems
… broad band multimedia services to numerous base stations of the network. The radio signals are placed on an optical carrier and distributed by means of an optical fiber network to the base stations (BS). In the BS the optical signals heterodyne in a photodiode to produce the radio signals …
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Performance Modeling, Design, and Analysis of Large Scale Terahertz Networks
… of two tiers, where tier 1 is composed of small base stations (SBSs) operating on the sub-6GHz spectrum, and tier 2 consists of dense deployment of Terahertz (THz) base stations (TBSs) with lower power transmission compared to the RF layer. Using stochastic geometry (SG) tools, I modeled and …
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The design and optimization of cooperative mobile edge
… directly attached to the deployed heterogeneous base stations. Different from the traditional wireless access networks, where the only dynamics come from the user mobility, the evolving mobile edge will be operated in the constantly changing and volatile environment. The harvested green energy …
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The estimation of precipitable water vapour from GPS measurements in South Africa
… using the South African network of permanent GPS base stations. This thesis sets out to answer four fundamental questions: i. In theory, can GPS observations be used to estimate the amount of precipitable water vapour (PWV) in the atmosphere? ii. What permanent GPS networks are being used in other …
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Optimisation and algorithms in wireless networks for mission critical applications
… Frequency Division Multiple Access (OFDMA)-based cooperative base stations and (b) event-region detection in Wireless Sensor Networks (WSNs). The first area of work makes contribution on problem of maximising the sum rate of two interfering users, while limiting the received interference at …
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