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 43 for “"Intermodulation"”.
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Intermodulation distortion in a broad band balanced mixer.
Massachusetts Institute of Technology. Dept. of Electrical Engineering. Thesis. 1969. M.S.
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Analysis of intermodulation interference to the instrument landing system
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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The automatic recognition of intermodulation, hum and snow noise in cable television systems
… of three kinds of impairments is discussed; intermodulation carrier beats, hum modulation and snow noise. The detection algorithms we develop are non-intrusive and do not require the use of test signals. A mathematical model which describes an intermodulation carrier beat is developed and the …
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Verification of d-wave pairing symmetry by microwave intermodulation distortion measurements in yttrium barium copper oxide
… and power dependence of the microwave frequency intermodulation distortion (IMD) in high quality pulsed laser deposition (PLD) Yttrium Barium Copper Oxide (YBCO) on LaAlO3 substrate. A low-temperature (T < 30 K) increase in IMD is the observation of an upturn of the nonlinear coefficient of the …
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Phased array impedance tuning, secure transmission, and nonlinear spatial intermodulation suppression for next-generation radar and communications systems.
… to the antenna elements. Undesired spatial intermodulation beams are transmitted as a result of the nonlinearities in these power amplifiers and can degrade both radar and communications mission abilities. The research presented in this dissertation resolves the nonlinear intermodulation …
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System model for the evaluation of interference "Cosite Analysis Model"
… the most important reason of interference is intermodulation (IM); this project introduces an intermodulation product interference detection and analysis tools. One of promising method which will use in this project is known as Method of Performing Antenna Cosite Analysis using Intermodulation …
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Interference mitigation in colocated wireless systems
… within the victim receiver front-end to produce intermodulation products that may fall on its desired receive channel and cause interference. The strong signals may also saturate the receiver circuits and cause desensitization. Second, large jamming signals from one colocated transmitter can …
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Methodologies for electromagnetic field modeling for computer aided analysis of multi-domain physical interactions
… for the phenomenological modeling of passive intermodulation generation in metallic contacts due to electron tunneling. The methodology provides for the development of passive intermodulation source models that are compatible with general-purpose electromagnetic and non-linear network …
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Observation of Singly Charged Barium Ions in a Buffer Gas: Towards a Functional Barium-Tagging System for Use in the Enriched Xenon Observatory
… of observation – continuous excitation and intermodulation. The intermodulation technique was determined to be more sensitive as single barium ions were observed with a high signal-to-noise ratio of ~4 for a one second observation time. Single ions were not observed using the continuous …
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New strategies for low noise, agile PLL frequency synthesis
… dBc/Hz at 100 kHz offset from the carrier. The intermodulation effect in synthesisers is capable of producing a family of spurious components of identical form to fractional spurs caused in quantisation process. This effect directly introduces high spurs on some channels of the synthesiser …
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The Design of Linearized Power Amplifier for Wireless Communications
… magnitude into the input in order to cancel the intermodulation terms at the output. Simulation and on the bench lab results validate the suggested technique. Also a hybrid PA module was designed and tested based on the suggested technique, and showed an improvement of 23 dB in the Third Order …
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Analysis of RF Front-End Non-linearity on Symbol Error Rate in the Presence of M-PSK Blocking Signals
… this will affect the system performance due to intermodulation products, and cross-modulation, to name a few. Intermodulation products are the result of adjacent channel signals that combine and create intermodulation distortion of the received signal. We call these adjacent channel signals …
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Third Order Nonlinearity In III-Nitride Microwave Switches
… the level of introduced nonlinear distortions. Intermodulation distortions occur due to device nonlinearity when multiple input frequencies produce undesired output signals. 3rd order intermodulation product is very important because it occurs in the frequency range close to that of fundamental …
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A new approach to dynamic range enhancement
… to be superior both in reducing harmonic and intermodulation distortion compared to other dynamic range enhancement techniques. The DRET has several advantages over automatic gain control (AGC) including stability and the absence of parasitic modulation on weak signals caused by fading or …
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Design of Ultrawideband Digitizing Receivers for the VHF Low Band
… signals or spectrum, either directly or through intermodulation. The receivers will typically use simple (i.e., narrowband) antennas, so the efficiency of power transfer to the preamplifier needs to be carefully considered. This thesis takes these design challenges into account and produces a …
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Modulation-Doped Field-Effect Transistors for High-Power Microwave Applications
… device characteristics is important to minimize intermodulation of high frequency signals under high-power operation. The linearity of device performance is investigated through the comparison of InGaAs/GaAs PHEMTs and doped channel FETs at dc and rf operation. InP is investigated as a channel …
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Wireless Information and Power Transfer Methods for IoT Applications
… that utilize RF backscattering, harmonics, and intermodulation products. These communication schemes operate with minimal power consumption and can be powered solely from harvested RF energy. The RF energy harvester and RF-powered transmitters designs are validated through simulation, …
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Novel predistortion techniques for RF power amplifiers
… reduce the upper and lower sideband third order intermodulation products in a two-tone test by 60 dB, or suppress the spectral regrowth by 40 dB and reduce the EVM (Error Vector Magnitude) down to 0.7% rms in 16 QAM signals, disregarding whether the tested power amplifiers or cascade amplifier …
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Superconducting RF front-end filters for cell phone base stations
… 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 counterparts. Were a business to sell these filters, the intended …
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