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 22 for “"transmitter power"”.
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Throughput Optimization and Transmitter Power Saving (TOTPS) Algorithm and Extended TOTPS (ETOTPS) Algorithm for IEEE 802.11 Links
… are proposed, a throughput optimization and transmitter power saving (TOTPS) algorithm and an extended throughput optimization and transmitter power saving (ETOTPS) algorithm, based on the knowledge of the C/N ratio at the receiver. In particular, we take the approach of adjusting link …
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Adaptive Digital Predistortion with Applications for LMDS Systems
… of current systems. Rain attenuation and limited transmitter power are the primary causes of the limited distance. Adaptive digital predistortion is presented as a method of increasing effective transmitter power. A background on LMDS link design, non-linear amplification, and predistortion is …
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Faster circuit optimization techniques for full-band and notched waveforms to enable next-generation radar.
… technologies are the fast reconfiguration of the transmitter power amplifier circuitry and the transmission of spectrally notched waveforms. This thesis presents two algorithms for the real-time circuit optimization necessary in spectrally agile radars: a modified gradient search algorithm for …
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Comparison of Direct and Heterodyne Detection Optical Intersatellite Communication Links
… to the pointing and tracking errors at the transmitter and receiver. In the presence of random pointing and tracking errors, optimal antenna gains exist that will minimize the required transmitter power. In addition to limiting the antenna gains, random pointing and tracking errors also …
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Power analysis and message decoding of laser engagement systems
… to correctly decode the messages from the laser transmitters when developing a decoder, or even just for verification of correct transmitter operation. Power measurements can be calculated from the sampled waveforms, but require proper sampling rates to ensure accurate power calculations. …
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Multidimensional power amplifier circuit optimizations for adaptive radar.
… the ability to dynamically reconfigure radar transmitter power amplifiers will become necessary for adaptive radar. Reconfigurable transmitters will require the ability to tune input parameters such as load impedance, waveform bandwidth, and amplifier bias voltage to provide excellent …
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Attojoule scale computation of large optical neural networks
… 10GHz) with CMOS compatible voltages at weight transmitter power dissipation comparable to a modern CPU.
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A Game-theoretic Analysis of Link Adaptation in Cellular Radio Networks
… emerged as a promising approach to solving the power control problem in wireless networks. This thesis extends the reach of game-theoretic analysis to embrace link adaptation, thereby constituting a generalization of the power control problem. A realistic and natural problem formulation is …
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Coding Strategies for Combating Interference on Point-to-Point and Multiple Access Channels
… where the interference is unknown to the transmitter or the receiver but is known to a third party whom we call the ""helper."" The task of the helper is to use his knowledge to significantly improve the quality of the channel, i.e., enable communication at much higher rates than would be …
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STUDY OF ADAPTIVE COMPRESSIVE SENSING FOR LOW POWER APPLICATIONS
… making it appealing for implementation of low-power sensors. This dissertation investigates techniques to further improve CS efficiency by adaptively adjusting the sampling rates or CS measurement sizes according to signal sparsity variations. The proposed technique is referred to as adaptive …
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Feedback Communication Systems for Time-Varying Channels
… removed by the simple expedient of devoting some transmitter energy to a channel estimation pilot-tone signal. Channel information thus derived by the receiver is fed back to the transmitter to control transmitter power and/or transmission rate. The resulting improvement in receiver error …
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Adaptive Arrays and Diversity Antenna Configurations for Handheld Wireless Communication Terminals
… for improving the coverage, capacity, and power efficiency of wireless communication systems. Diversity experiments using a handheld antenna array testbed (HAAT) are reported here. These experiments indicate that signals received by the antennas in two-element handheld antenna arrays with …
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Resource Allocation and Adaptive Antennas in Cellular Communications
… 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 carried traffic of the …
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Design and Implementation of an RF front end for the NeXtRAD radar system
… with the design predictions, yielding peak transmitter power levels in excess of 61dBm at L-band, and 54dBm at X-band. Some non-conformances were also identified, but these were as a result of component problems and not system design. Since the front end could not yet be integrated into the …
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Circuits and systems for efficient portable-to-portable wireless charging
In today's world of ever-increasing low-power portable electronics, from implants to wireless accessories, powering these devices efficiently and conveniently is an escalating issue. The proposed solution is to wirelessly recharge these lower-power portable devices through a common magnetic link …
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Design of an HF transmit antenna for bistatic ionospheric soundings in Antarctica
… Space Agency (SANSA) plans to install a low-powered high frequency (HF) transmitter at the South Pole for use in a bistatic ionospheric sounding system intended to detect such TIDs. The aim of this dissertation was to design a suitable transmitter antenna such that propagating skywave signals …
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Efficiency Improvement of WCDMA Base Station Transmitters using Class-F power amplifiers
… such as QPSK need, in turn, a very linear power from the output of the transmitter power amplifier in order to meet the spectral requirements. A linear power amplifier, traditionally, has very low energy efficiency. Poor energy efficiency directly affects operational costs and causes …
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Efficient baseband design and implementation for high-throughput transmitters
… seeing a demand for smaller chipsets with lower power budgets. Digital basebands with increased energy-efficiency are needed while fitting within tight area constraints. High spectral efficiency demands modulation schemes with high peak to average power ratio, increasing the precision …
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3D Micromachined Passive Components and Active Circuit Integration for Millimeter-wave Radar Applications
… integrated mm-wave a 94 Ghz monopulse radar transmitter/receiver. Several architectural approaches are considered, including passive and active implementations of RF monopulse comparator networks. These architectures are enabled by a high-performance three-dimensional rectangular coaxial …
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Design of Low Power Integrated Radios
… this thesis, circuit techniques pertinent to low power CMOS integrated radio design compatible with IEEE 802.15.6 standard are presented. Low power radios are in increasing demand with the advent of an era of the Wireless Body Area Networks and Internet of Things. The performance of the proposed …
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