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 36 for “"Radio signal"”.
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Coarse Radio Signal Classifier on a Hybrid FPGA/DSP/GPP Platform
… all the parameters needed from a received signal for physical layer demodulation and configure a cognitive radio accordingly. Currently, UCS can process analog amplitude modulation (AM) and frequency modulation (FM) and digital narrow band M-PSK, M-QAM and wideband signal orthogonal …
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An investigation into the viability of using radio signal strength across multiple frequencies for personnel tracking
… with one mobile network point, and measuring the radio signal strength of the network communications between the mobile and fixed points. This project attempted to improve on this technique by investigating whether additional information and accuracy could be achieved by measuring signal strength …
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KAAY's Beaker Street 1966-1977: Late Nights Of Underground Radio Programming, From Little Rock To The Western Hemisphere, On The Airwaves Of The Nighttime Voice Of Arkansa
During the 1960s in the United States, AM radio stations began broadcasting an underground format. The purpose of this study is to examine the Beaker Street program on Little Rock's KAAY AM-1090. This show presented non-mainstream programming. Disc jockeys supported alternative points of view, …
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Construction and analysis of real-time relay for efficient antenna sharing
… packets. I use a heterodyne system where the radio signal from the originating node is translated to a new frequency band to retransmit. Latency measurements of less than one microsecond and signal-to-noise ratio loss of 2.3 dB are found. Comparisons with a time domain multiplexing digital …
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Design and Implementation of an Analog High Power Broadband Self Interference Canceller for In Band Full Duplex
… for Simultaneous Transmit And Receive (STAR) of radio signal broadcasting. Previous research and designs by other groups have resulted in systems that either operate at high powers or are capable of cancellation over a wide bandwidth. This work seeks to build upon previous research in order to …
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A field programmable gate array based software defined radio design for the space environment
This thesis focuses on a Software Defined Radio (SDR) designed to compress a wideband radio signal input for a narrowband signal output. The design is based on a Field Programmable Gate Array (FPGA), which is chosen for its reprogrammability, flexibility, and our ability to introduce fault …
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Exploiting Cyclostationarity for Radio Environmental Awareness in Cognitive Radios
… in continuing this growth. Recent studies on radio spectrum usage have shown that pre-allocation of spectrum bands to specific wireless communication applications leads to poor utilization of those allocated bands. Therefore, research into new techniques for efficient spectrum utilization is …
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Characterization of Electron Number Density of Rocket Exhaust Plumes Through Microwave Transmissions
… (FDTD) simulations also supports the results. Radio frequency and radar methodologies are used to characterize the plume as a dynamic component of an electrical system, supported by the construction of an RF apparatus that includes the design and manufacture of ultra-wideband antenna arrays. …
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Human Mesh Recovery Using Radio Signals
… and bad lighting conditions. We leverage that radio frequency (RF) signals in the WiFi range traverse clothes and occlusions and bounce off the human body. Our model parses such radio signals and recovers 3D body meshes. Our meshes are dynamic and smoothly track the movements of the …
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Thermal design and analysis of the SKA SA MeerKAT Digitiser
… venture attempting to build the world's largest radio telescope. Australia and South Africa (together with other African countries), will be host to the SKA site. Both countries are building pre-cursor radio telescopes to demonstrate their ability to successfully host the project. Square …
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Application of an automatic data acquisition system in mass transit
… processing accurately, removing the need for a radio signal to be imbedded for locational accuracy. This, consequently eliminates the signposts installation and maintenance costs and worries. A sensitivity analysis of the algorithm using a real life data file revealed that the matching process …
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Improving the Performance of the world Wide Web over Wireless Networks
… to fetch over low-bandwidth wireless networks. Radio signal dropouts cause file transfers to abort; users have to restart file transfers from the beginning. Dropouts also prevent access to documents that have not yet been visited by the user. All of these problems create user frustration and …
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The impact of Rayleigh fading channel effects on the RF-DNA fingerprinting process
… that unintentionally occur within a given radio’s transmit chain during waveform generation. In this work, the application of RF-DNA fingerprinting is extended by developing a Nelder-Mead-based algorithm that estimates the coefficients of an indoor Rayleigh fading channel. The performance …
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Total power radiometers at 12, 20 and 30 GHz used in the OLYMPUS experiment at Virginia Tech
This paper discusses the total power radiometers in the propagation experiment at Virginia Tech using the OLYMPUS communications satellite. The experiment is set up to measure the received signal strength of beacons at 12.502, 19.770 and 29.656 GHz on board the OL YMPUS satellite in order to gather …
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A*-Based Path Planning for an Unmanned Aerial and Ground Vehicle Team in a Radio Repeating Operation
… strategies can cause substantial degradations in radio link quality. Therefore, this thesis incorporates an unmanned aerial vehicle as a radio repeating node and presents a path planning strategy to cooperatively navigate the vehicle team so that radio link health is maintained. This navigation …
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Multifrequency Scintillation in the Polar Caps
… of modifying the phase and amplitude of a radio signal in a rapid random manner in a process called scintillation. The Coherent Electromagnetic Radio Tomography (CERTO) and the Canadian High Arctic Ionospheric Network (CHAIN) are two different networks of scintillation receivers, each with …
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Real-time localization using received signal strength
… and tracking of wireless devices using radio signal strength (RSS) measurements in an indoor environment is undertaken. This dissertation is presented in the form of five papers.</p><p>The first two papers deal with localization and placement of receivers using a range-based method where …
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Integration of rain fade into OPNET
… it uses common propagation models to model radio propagation. It is also possible for users to include their own custom made propagation models to run as part of simulations.This dissertation covers the study done to integrate rain fade into OPNET by including in one of the propagation …
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An intelligent approach to quality of service for MPEG-4 video transmission in IEEE 802.15.1
… high-security, high-speed and low-cost radio signal technology. This wireless technology allows a maximum access range of 100 meters yet needs power as low as 1mW. Regrettably, IEEE 802.15.1 has a very limited bandwidth. This limitation can become a real problem If the user wishes to …
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