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 30 for “"predistortion"”.
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Exploring predistortion training algorithms in a Cartesian feedback-trained digital predistortion system for RF power amplifier linearization
A Cartesian feedback-trained digital predistortion system for RF power amplifier linearization offers many advantages with its combination of two different linearization techniques. This thesis describes such a system, focusing on the important issue of predistorter training. It examines and …
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Novel predistortion techniques for RF power amplifiers
… is an essential accessory for everyone nowadays, predistortion for the RF power amplifiers in mobile phone systems becomes more and more popular. Especially, new predistortions for power amplifiers with both nonlinearities and memory effects interest the researchers. In our thesis, novel …
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Predistortion for Nonlinear Power Amplifiers with Memory
The fusion of voice and data applications, along with the demand for high data-rate applications such as video-on-demand, is making radio frequency (RF) spectrum an increasingly expensive commodity for current and future communications. Although bandwidth-efficient digital modulation alleviates …
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Adaptive Digital Predistortion with Applications for LMDS Systems
… 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 presented to assist the reader. A developed simulation uses AM-AM and AM-PM …
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Diode Predistortion Linearization for Power Amplifier RFICs in Digital Radios
… work presented in this thesis focuses on diode predistortion linearization, particularly for PA RFICs in digital radios. Background discussion on common linearization techniques available to the PA designer is presented. In addition, a discussion of traditional and modern methods of nonlinearity …
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Advanced digital predistortion of power amplifiers for mobile and wireless communications
… model extraction methods, memoryless digital predistortion technique based on distortion components iterative injection, baseband equalisation technique for minimising memory effects, Matlab-ADS co-simulation system and adaptation circuit with an offline training scheme. The thesis presents …
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Compact Digital Predistortion for Multi-band and Wide-band RF Transmitters
… is focusing on developing a compact digital predistortion (DPD) system which costs less DPD added power consumptions. It explores a new theory and techniques to relieve the requirement of the number of training samples and the sampling-rate of feedback ADCs in DPD systems. A new theory about …
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Digital predistortion of RF amplifiers using baseband injection for mobile broadband communications
… distortion and improve signal quality, digital predistortion (DPD) techniques are widely used. This work focuses on improving the performances of DPDs in modern, next-generation wireless transmitters. A new adaptive DPD based on an iterative injection approach is developed and experimentally …
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Compensation of nonlinear distortion in RF amplifiers for mobile communications
… model, in order to develop an effective predistortion system. Current researches are focused on modelling and predistortion of power amplifiers with memory, as well as memoryless ones. Different methods for modelling are used, as the Volterra series, polynomial models, look-up tables, the …
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Behavioral Model and Predistortion Algorithm to Mitigate Interpulse Instabilities Induced by Gallium Nitride Power Amplifiers in Multifunction Radars
… This model has been used to develop a digital predistortion technique that successfully mitigates the impact of the transients. The Moving Target Indicator (MTI) Improvement Factor and the Root Mean Square (RMS) Pulse-to-Pulse Stability are used as metrics to assess the impact of the transients …
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New architecture for RF power amplifier linearization
… : two-point architecture and adaptive digital predistortion using a [delta sigma] modulator for automatic inversion of power amplifier nonlinearity. Two-point architecture can be seen as a solution that extends the linearization bandwidth of the traditional feedback architecture while also …
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Energy-efficient wireless transmitter architecture for mobile multimedia
… transmitter reliability. First, mobile adaptive predistortion to improve transmitter reliability is presented. Second, parallel segmented modulation (PSM) to improve average efficiency is introduced. A prototype PSM transmitter chip for gigabit Wi-Fi (IEEE 802.11ac VHT160 standard) is designed, …
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Design and implementation of adaptive baseband predistorter for OFDM nonlinear transmitter. Simulation and measurement of OFDM transmitter in presence of RF high power amplifier nonlinear distortion and the development of adaptive digital predistorters based on Hammerstein approach.
… investigate, design and measurement of a digital predistortion linearizer that is able to compensate the dynamic nonlinear distortion of a High Power Amplifier (PA). The effectiveness of the proposed baseband predistorter (PD) on the performance of a WLAN OFDM transmitter utilizing a nonlinear PA …
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Image formation using geometrical theory of diffraction and its applications to lithography
… AND USING THE VERTEX-BASED MODEL, THE AMOUNT OF PREDISTORTION</P><P>NEEDED FOR OPTICAL PROXIMITY CORRECTION CAN BE SOLVED FROM A SYSTEM OF</P><P>LINEAR EQUATIONS. THE IMAGE DISTURBANCE OF 1D NON-PLANAR MASK OBJECT CAN BE OBTAINED</P><P>SIMILARLY. COMPARED WITH EXISTING METHODOLOGY WHERE THE …
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A fully-integrated all-digital outphasing transmitter for wireless communications
… It is newly proposed that two distinct digital predistortion algorithms are required for perfect compensation for both PAs and a combiner. All phase calibration values can be adaptively calculated as a function of outphase angle and saved in digital look-up tables to predistort the phase inputs …
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Design and Linearization of Energy Efficiency Power Amplifier in Nonlinear OFDM Transmitter for LTE-5G Applications. Simulation and measurements of energy efficiency power amplifier in the presence of nonlinear OFDM transmitter system and digital predistortion based on Hammerstein-Wiener method
This research work has made an effort to understand a novel line of radio frequency power amplifiers (RFPAs) that address initiatives for efficiency enhancement and linearity compensation to harmonize the fifth generation (5G) campaign. The objective is to enhance the performance of an orthogonal …
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Bioorthogonal Reagents: Design, Synthesis, and Reactivity
… of hyperconjugative antiaromaticity and predistortion. These dienes can also be stabilized to biological nucleophiles allowing their use in biological systems. In part 2, a new cyclooctyne is developed for SPAAC. This cyclooctyne, ABC, is activated by increased strain and electronic …
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Joint compensation of I/Q impairments and PA nonlinearity in mobile broadband wireless transmitters
… using accurate, low complexity digital predistortion (DPD) technique. After analysing the distortion created by I/Q modulators and PAs together with nonlinear crosstalk effects in multi-branch multiple input multiple output (MIMO) wireless transmitters, a novel two-box model is proposed …
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Class-E Power Amplifiers in Modern RF Transmitters
… is presented. Secondly, a novel phase-only predistortion technique for class-E outphasing PAs is proposed. Thirdly, linearization of the fabricated outphasing PA based on memory polynomial model is demonstrated using a 64QAM OFDM modulated signal with 20 MHz bandwidth. Overall, this work …
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