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Dissertations / Theses on the topic 'Digital predistortion'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Tallmarken, Manne. "Digital Predistortion for Broadcast FM repeaters." Thesis, KTH, Signalbehandling, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-53778.

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This thesis presents the design and implementation of a memoryless and adaptive digital predistorter used to linearize a power amplier. Specically, it deals with the implementation of a so-called constantgain predistorter, based on a lookup table, on a digital signal processing board built around an FPGA. The board also has two analog-to-digital converters, two digital-to-analog converters and a PIC microcontroller. By means of a high speed USB interface, input/output data to/from the system can be captured and sent to a PC. The adaptation of the constant-gain predistorter is implemented in Ma

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2

Waegemans, R. "Digital electronic predistortion for optical communications." Thesis, University College London (University of London), 2010. http://discovery.ucl.ac.uk/20007/.

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The distortion of optical signals has long been an issue limiting the performance of communication systems. With the increase of transmission speeds the effects of distortion are becoming more prominent. Because of this, the use of methods known from digital signal processing (DSP) are being introduced to compensate for them. Applying DSP to improve optical signals has been limited by a discrepancy in digital signal processing speeds and optical transmission speeds. However high speed Field Programmable Gate Arrays (FPGA) which are sufficiently fast have now become available making DSP experim

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3

Karlsson, Robert. "Digital predistortion of semi-linear power amplifier." Thesis, Linköping University, Department of Electrical Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2617.

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<p>In this thesis, a new way of using predisortion for linearization of power amplifiers is evaluated. In order to achieve an adequate power level for the jamming signal, power amplifiers are used in military jamming systems. Due to the nonlinear characteristic of the power amplifier, distortion will be present at the output. As a consequence, unwanted frequencies are subject to jamming. To decrease the distortion, linearization of the power amplifier is necessary. </p><p>In the system of interest, a portion of the distorted power amplifier output signal is fed back. Using this measurement, a

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4

Ba, Seydou Nourou. "Efficient digital baseband predistortion for modern wireless handsets." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31760.

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Thesis (Ph.D)--Electrical and Computer Engineering, Georgia Institute of Technology, 2010.<br>Committee Chair: Altunbasak, Yucel; Committee Co-Chair: Zhou, G. Tong; Committee Member: Al-Regib, Ghassan; Committee Member: Kenney, James Stevenson; Committee Member: Ma, Xiaoli; Committee Member: Pan, Ronghua. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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5

Johnson, Daniel Eric. "Adaptive Digital Predistortion with Applications for LMDS Systems." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/34964.

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A limiting factor in the widespread deployment of LMDS systems is the limited distance 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. <p>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 characteristics obtained from laboratory measurements of a 28 GHz amplifier to determine the effect of several predistortion implementati

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6

Ding, Lei. "Digital predistortion of power amplifiers for wireless applications." Diss., Available online, Georgia Institute of Technology, 2004:, 2004. http://etd.gatech.edu/theses/available/etd-04022004-020955/unrestricted/ding%5Flei%5F200405%5Fphd.pdf.

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Thesis (Ph. D.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2004.<br>J. Stevenson Kenney, Committee Member ; G. Tong Zhou, Committee Chair ; W. Marshall Leach, Committee Member ; Ye (Geoffrey) Li, Committee Member ; Jianmin Qu, Committee Member. Includes bibliographical references (leaves 100-103).

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7

Giesbers, David Mathew. "Adaptive digital polynomial predistortion linearisation for RF power amplifiers." Thesis, University of Canterbury. Electrical and Computer Engineering, 2008. http://hdl.handle.net/10092/2044.

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Development of linear modulation schemes has opened the way for spectrally efficient, high speed digital communication systems for voice and data applications. A trend has been to develop ultra wide and wide bandwidth modulation formats, which has meant feedback linearisation schemes (both analogue and digital) are no longer effective. This has in turn led to a number of approaches that involve predistorting the signal prior to amplification, with a characteristic that is the inverse to that of the power amplifier (PA). This thesis presents a polynomial based predistortion for linearisation of

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8

Barradas, Filipe Miguel Esturrenho. "Modeling and digital predistortion of wireless radio frequency transmitters." Doctoral thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/18661.

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Doutoramento em Engenharia Electrotécnica<br>Nos atuais sistemas de telecomunicações, os transmissores de rádio-frequência são desenvolvidos tendo maioritariamente em conta a eficiência da conversão da potência fornecida da fonte em potência de rádio-frequência. Este tipo de desenho resulta em amplificadores de potência com características de transmissão não-lineares, que distorcem severamente o envelope de informação no processo de amplificação, gerando distorção fora da banda. Para corrigir este problema utiliza-se um processo de compensação não linear, sendo que a pré-distorção digital se

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9

Huang, Jeffrey B. "Exploring predistortion training algorithms in a Cartesian feedback-trained digital predistortion system for RF power amplifier linearization." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/36799.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2006.<br>Includes bibliographical references (p. 117-118).<br>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 analyzes in great detail the promising loop filter pre-charging optimization and the tradeoffs associated with such training, developi

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10

Mengozzi, Mattia. "Direct Learning Power Amplifier Digital Predistortion using Multi-Objective Optimization." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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All’interno di una stazione radio base l’amplificatore di potenza a radiofrequenza (RF PA) è di gran lunga l’elemento più importante dal punto di vista energetico, dato che il suo compito è quello di fornire al segnale la potenza necessaria per essere trasmesso. Di conseguenza sono state sviluppate numerose tecniche per aumentare l’efficienza e la linearità dei PA. Ad esempio, le architetture di Envelope Tracking (ET) migliorano l’efficienza complessiva del sistema modulando la tensione di alimentazione in banda base (LF), mentre la digital predistortion (DPD) ne incrementa la linearità distor

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11

Vieira, Luis Carlos. "Digital baseband modelling and predistortion of radio over fibre links." Thesis, University of Kent, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.594103.

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Radio-over-Fibre (RoF) is an alternative solution for the distribution of RF communication signals between a central base station and remote antenna units (RAUs) and can be seen as an enabling · technique to increase the coverage area of broadband wireless access networks. However, the nonlinear distortion introduced by the ReF link may impose serious limitations on the system performance, especial ly considering the high peak-Ie-average power ratio PAPR of complex signal formats, such as orthogonal frequency-division multiplexing (OFDM) and Widehand Code Division Multiple Access (WCD:MA). The

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12

Andersson, Erik, and Christian Olsson. "Linearization of Power Amplifier using Digital Predistortion, Implementation on FPGA." Thesis, Linköpings universitet, Elektroniksystem, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-112258.

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The purpose of this thesis is to linearize a power amplifier using digital predistortion. A power amplifier is a nonlinear system, meaning that when fed with a pure input signal the output will be distorted. The idea behind digital predistortion is to distort the signal before feeding it to the power amplifier. The combined distortions from the predistorter and the power amplifier will then ideally cancel each other. In this thesis, two different approaches are investigated and implemented on an FPGA. The first approach uses a nonlinear model that tries to cancel out the nonlinearities of the

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13

Eriksson, Marcus. "Analysis of Digital Predistortion in a Wideband Arbitrary Waveform Generator." Thesis, Linköpings universitet, Kommunikationssystem, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-123410.

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Digital predistortion is a signal processing technique used to remove undesired distortions caused by nonlinear system effects. This method is predominately used to linearize power amplifiers in communication systems in order to achieve efficient transmitter circuits. However, the technique can readily be applied to cancel undesired nonlinear behavior in other types of systems. This thesis investigates the effectiveness of digital predistortion in the context of a wideband arbitrary waveform generator. A theoretical foundation discussing nonlinear system models, predistortion architectures and

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14

Haskins, Christopher Burke. "Diode Predistortion Linearization for Power Amplifier RFICs in Digital Radios." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/31888.

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The recent trend in modern information technology has been towards the increased use of portable and handheld devices such as cellular telephones, personal digital assistants (PDAs), and wireless networks. This trend presents the need for compact and power efficient radio systems. Typically, the most power inefficient device in a radio system is the power amplifier (PA). PA inefficiency requires increased battery reserves to supply the necessary DC bias current, resulting in larger devices. Alternatively, the length of time between battery charges is reduced for a given battery size, reducing

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15

Naraharisetti, Naveen. "Linearization of Concurrent Dual-Band Power Amplifier Using Digital Predistortion." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1406151856.

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16

Hadi, Muhammad Usman. "Digital predistortion for compensation of nonlinearities in Radio over Fiber Links." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016.

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In order to cope up with the ever increasing demand for larger transmission bandwidth, Radio over Fiber technology is a very beneficial solution. These systems are expected to play a major role within future fifth generation wireless networks due to their inherent capillary distribution properties. Nonlinear compensation techniques are becoming increasingly important to improve the performance of telecommunication channels by compensating for channel nonlinearities. Indeed, significant bounds on the technology usability and performance degradation occur due to nonlinear characteristics of o

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17

Gilabert, Pinal Pere Lluís. "Multi Look-Up Table Digital Predistortion for RF Power Amplifier Linearization." Doctoral thesis, Universitat Politècnica de Catalunya, 2008. http://hdl.handle.net/10803/6915.

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Aquesta Tesi Doctoral se centra en el disseny d'un nou linealitzador de Predistorsió Digital (Digital Predistortion - DPD) capaç de compensar la dinàmica i els efectes no lineals introduïts pels Amplificadors de Potència (Power Amplifiers - PAs). Un dels trets més rellevants d'aquest nou predistorsionador digital i adaptatiu consisteix en ser deduïble a partir d'un model de PA anomenat Nonlinear Auto-Regressive Moving Average (NARMA). A més, la seva arquitectura multi-LUT (multi-Taula) permet la implementació en un dispositiu Field Programmable Gate Array (FPGA).<br/><br/>La funció de predisto

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18

Isaksson, Magnus. "Radio Frequency Power Amplifiers : Behavioral Modeling, Parameter Reduction, and Digital Predistortion." Doctoral thesis, KTH, Signalbehandling, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-24198.

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This work considers behavioral modeling, parameter-reduction, and digital predistortion of radio frequency power amplifiers. Due to the use of modern digital modulation methods, contemporary power amplifiers are frequently subjected to signals characterized by considerable bandwidths and fast changing envelopes. As a result, traditional quasi-memoryless amplitudeto-amplitude (AM/AM) and amplitude-to-phase (AM/PM) characteristics are no longer sufficient to describe and model the behavior of power amplifiers; neither can they be successfully used for linearization. In this thesis, sampled input

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19

Deleu, Thibault. "Digital predistortion and equalization of the non-linear satellite communication channel." Doctoral thesis, Universite Libre de Bruxelles, 2014. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209212.

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In satellite communications, non-linear interference is created by the non-linear power amplifier aboard the satellite. Even in the case of a memoryless power amplifier, the channel is a non-linear system with memory due to the presence of linear filters on ground and aboard the satellite. The non-linear interference degrades the system performance, especially when considering high-order modulations or in case of several signals being amplified by the same power amplifier. In this thesis, we have proposed algorithms at the transmitter and at the receiver to digitally compensate this interferen

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20

Lee, Kok Chew. "Analysis and implementation of adaptive digital predistortion techniques for transmitter linearisation." Thesis, University of Birmingham, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.409072.

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21

Kim, Ji Woo. "A GENERALIZED ARCHITECTURE FOR THE FREQUENCY-SELECTIVE DIGITAL PREDISTORTION LINEARIZATION TECHNIQUE." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1339690468.

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22

Patel, Jayanti. "Adaptive digital predistortion linearizer for power amplifiers in military UHF satellite." [Tampa, Fla.] : University of South Florida, 2004. http://purl.fcla.edu/fcla/etd/SFE0000230.

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23

Franco, Marcelo Jorge Herczfeld Peter R. "Wideband digital predistortion linearization of radio frequency power amplifiers with memory /." Philadelphia, Pa. : Drexel University, 2005. http://dspace.library.drexel.edu/handle/1860/485.

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24

Wang, Siqi. "Study on complexity reduction of digital predistortion for power amplifier linearization." Thesis, Paris Est, 2018. http://www.theses.fr/2018PESC1011/document.

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Ce travail concerne la linéarisation des amplificateurs de haute puissance en utilisant la pré-distorsion numérique. L’amplificateur de haute puissance est un composant non-linéaire. La pré-distorsion numérique adaptative en bande de base est un technique efficace pour linéariser ses non-linéarités et ses effets de mémoire. Les modèles de la pré-distorsion numérique de basse complexité sont étudiés dans cette thèse. Un algorithme est proposé pour déterminer une structure optimale de modèle uni-étage ou multi-étage en prenant compte du compromis entre la précision de modélisation et la complexi

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25

Bondar, Dmytro. "Advanced digital predistortion of power amplifiers for mobile and wireless communications." Thesis, University of Westminster, 2009. https://westminsterresearch.westminster.ac.uk/item/90vz6/advanced-digital-predistortion-of-power-amplifiers-for-mobile-and-wireless-communications.

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This research work focuses on improving the performances of digital predistorters while maintaining low computational complexity for mobile and wireless communication systems. Initially, the thesis presents the fundamental theory of power amplifiers, overview of existing linearisation and memory-effects compensation techniques and reveals the current issues in the field. Further, the thesis depicts the proposed solutions to the problems, including the developed in-band distortion modelling technique, model extraction methods, memoryless digital predistortion technique based on distortion compo

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26

Eklund, Henrik. "Linearization of Resistive Digital-to-Analog Converter for RF-Applications Using Compensator and Digital Predistortion." Thesis, Linköpings universitet, Elektroniska Kretsar och System, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-177574.

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High-speed digital-to-analog converters are critical components in many radiofrequency (RF) applications. The resistive DAC (RDAC) architecture is suitable for high-speed implementation in extremely scaled digital circuit nodes. An RDAC core can be implemented as a resistance network and a digital block, consisting of inverters as drivers to the resistive network. One disadvantage of the architecture is the input code-dependent supply current. Combined with a non-zero supply network impedance, the code-dependent current will introduce non-linearity in the output voltage. One way to circumvent

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27

Trinh, Jessica. "ADS och Matlab för optimering av pre-distortion av effektförstärkare." Thesis, Linköpings universitet, Institutionen för systemteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-119222.

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This master’s thesis deals with integrating simulations using Agilents Electronic Design Automation tool ADS with customized Matlab scripts, for solving complex analog and digital radio architectures. In particular, it addresses predistortion, realized in the digital domain, of power amplifiers, modeled in the analog domain. The former is implemented in Matlab while the latter is implemented in ADS. Two versions of integrating the two systems have been tested: 1) Iterative approach on sample basis and 2) Scheduled batch solution by matrix inversion. The concept has been tested on two different

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28

Erdogdu, Gozde. "Linearization Of Rf Power Amplifiers By Using Memory Polynomial Digital Predistortion Technique." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614420/index.pdf.

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In modern wireless communication systems, new modulation types are introduced in order to support more users by considering spectral efficiency. These new signals are ensitive to nonlinearity when they have high peak to average ratio. The main part in the system that causes nonlinearity is the power amplifier. For power amplifiers, between linearity and efficiency, there is a trade-off. However, by using predistortion techniques, both linearity and efficiency can be obtained. In this thesis, various predistortion methods are explained and memory polynomial digital predistortion is studied bec

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29

Buckley, Richard James. "A digital signal processing-based predistortion technique for reduction of intermodulation distortion /." Online version of print, 1993. http://hdl.handle.net/1850/11455.

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30

Cabarkapa, Milan. "Digital predistortion of RF amplifiers using baseband injection for mobile broadband communications." Thesis, University of Westminster, 2014. https://westminsterresearch.westminster.ac.uk/item/8yq22/digital-predistortion-of-rf-amplifiers-using-baseband-injection-for-mobile-broadband-communications.

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Radio frequency (RF) power amplifiers (PAs) represent the most challenging design parts of wireless transmitters. In order to be more energy efficient, PAs should operate in nonlinear region where they produce distortion that significantly degrades the quality of signal at transmitter’s output. With the aim of reducing this 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

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31

Guérin, Alexandre, Guy Lesthievent, Jean-Pierre Millerioux, et al. "Digital Predistortion of Power Amplifier Non-Linearity Applied to CCSDS/DVB-S2 Satellite Telemetry." International Foundation for Telemetering, 2013. http://hdl.handle.net/10150/579579.

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ITC/USA 2013 Conference Proceedings / The Forty-Ninth Annual International Telemetering Conference and Technical Exhibition / October 21-24, 2013 / Bally's Hotel & Convention Center, Las Vegas, NV<br>The CNES (French Space Agency) has studied memoryless predistortion techniques for power amplifier nonlinearity of satellite payload telemetry. These techniques are applied to high order modulations taken from the DVB-S2 standard and the associated CCSDS blue book. An easy-to-implement calibration method was also developed. The predistortion was implemented at two times the symbol rate after Squar

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32

Woo, Wangmyong. "Hybrid Digital/RF Envelope Predistortion Linearization for High Power Amplifiers in Wireless Communication Systems." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6924.

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Hybrid Digital/RF Envelope Predistortion Linearization for High Power Amplifiers in Wireless Communication Systems Wangmyong Woo 151 Pages Directed by Dr. J. Stevenson Kenney The objective of this research is to implement a hybrid digital/RF envelope predistortion linearization system for high-power amplifiers used in wireless communication systems. It is well known that RF PAs have AM/AM (amplitude modulation) and AM/PM (phase modulation) nonlinear characteristics. Moreover, the distortion components generated by a PA are not constant, but vary as a function of many input conditions such

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33

Farabegoli, Alessio [Verfasser]. "Digital Predistortion and Crest Factor Reduction Architectures for Mobile Radio Handset Transmitters / Alessio Farabegoli." München : Verlag Dr. Hut, 2016. http://d-nb.info/1084386585/34.

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JIANG, TAO. "Behavioral modeling and FPGA implementation of digital predistortion for RF and microwave power amplifiers." Doctoral thesis, Politecnico di Torino, 2016. http://hdl.handle.net/11583/2639711.

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With the high interest in digital modulation techniques which are very sensitive to the PA nonlinearity, modern wireless communication systems require the usage of linearization techniques to improve the linear behavior of the RF power amplifier. The powerful and cheap digital processing technology makes the digital predistortion (DPD) a competitive candidate for the linearization of the PA. This thesis introduces the basic principle of DPD, its implementation on FPGA and the adaptive DPD system. The linearization of 4 PAs with DPD technique has been introduced: for the hybrid class AB PA ope

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Mitrevski, Dragan. "Design and Characterization of a 6 W GaN HEMT Microwave Power Amplifier with Digital Predistortion Linearization." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elektronikk og telekommunikasjon, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-12612.

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In this thesis, characterization of a 6W GaN HEMT power amplifier for optimal operating conditions through load pull simulations and measurements is investigated.The purpose is to find source and load impedances to achieve for instance maximum efficiency and maximum output power, and investigate whether thesimulated results can be replicated in a measurement setup. Simulations show that when matching for maximum output power, a peak output power of 13W is achieved, while in 1 dB compression, an output powerof 11.40W together with a power added efficiency of nearly 67% is obtained, a remarkable

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Feng, Xiaowen. "Efficient baseband digital predistortion techniques for linearizing power amplifier by taking into account nonlinear memory effect." Nantes, 2015. https://archive.bu.univ-nantes.fr/pollux/show/show?id=3619006c-f9da-4c0b-8b67-4445eda2c7b1.

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Les techniques de pré-distorsion numérique (DPD) en bande de base permettant de linéariser un amplificateur de puissance (PA) avec effets mémoires non linéaires sont étudiées. Des éléments de base liés à la linéarisation du PA sont introduits, tels que le comportement non-linéaire du PA, son influence sur les systèmes de communication, sa modélisation et caractérisation. . . Puis certaines techniques de linéarisation existantes sont décrites, telles que le recul de puissance, le feedforward, la boucle de retour, l’amplification linéaire avec des composants non linéaires et la DPD. La DPD est l

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Yu, Xin [Verfasser], and Georg [Akademischer Betreuer] Fischer. "Contributions to Digital Predistortion of Radio-Frequency Power Amplifiers for Wireless Applications / Xin Yu. Betreuer: Georg Fischer." Erlangen : Universitätsbibliothek der Universität Erlangen-Nürnberg, 2012. http://d-nb.info/1026365481/34.

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Ku, Hyunchul. "Behavioral modeling of nonlinear RF power amplifiers for digital wireless communication systems with implications for predistortion linearization systems." Diss., Available online, Georgia Institute of Technology, 2004:, 2003. http://etd.gatech.edu/theses/available/etd-04052004-180035/unrestricted/ku%5Fhyunchul%5F200312%5Fphd.pdf.

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Baschieri, Lorenzo. "Feasible predistortion loop for the linearization of Radio-over-Fiber system based on 850 nm Vertical Cavity Surface Emitting Laser and standard G.652 fiber." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/22266/.

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The main purpose of the work is to investigate a low-cost solution for systems designed for the distribution of the RF signal employing the Radio Over Fiber (RoF) technology, including the additional feature of a possible digital predistortion of the modulating signal to compensate the detrimental effects of the system nonlinearities. A Vertical Cavity Surface Emitting Laser (VCSEL) operating at 850 nm and the standard single mode fiber G-652 have been used with this purpose, since their combination is one of the cheapest possible solutions that can be implemented. The main problem present

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Donati, Giovanni [Verfasser], Georg [Gutachter] Fischer, and Jan-Erik [Gutachter] Müller. "Advanced Digital Predistortion Algorithms for modern Base-Station Front-Ends. A physically motivated approach / Giovanni Donati ; Gutachter: Georg Fischer, Jan-Erik Müller." Erlangen : FAU University Press, 2017. http://d-nb.info/1152079050/34.

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Tua-Martinez, Carlos Gustavo. "Behavioral Model and Predistortion Algorithm to Mitigate Interpulse Instabilities Induced by Gallium Nitride Power Amplifiers in Multifunction Radars." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/74445.

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The incorporation of Gallium Nitride (GaN) Power Amplifiers (PAs) into future high power aperture radar systems is certain; however, the introduction of this technology into multifunction radar systems will present new challenges to radar engineers. This dissertation describes a broad investigation into amplitude and phase transients produced by GaN PAs when they are excited with multifunction radar waveforms. These transients are the result of self-heating electrothermal memory effects and are manifested as interpulse instabilities that can negatively impact the coherent processing of multi

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Jagla, Lukáš. "Adaptace digitálního předzkreslovače pro linearizaci zesilovačů s použitím komparátoru." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-413157.

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Diplomová práce pojednává o návrhu nového hardwaru využívající komparátor ve zpětné vazbě systému pro digitální předzkreslování signálu. Vybrané vlastnosti navrhované architektury jsou ověřeny pomocí simulací a následně jsou zvoleny komponenty vhodné pro vysokofrekvenční použití za účelem implementace. Na bázi předložené architektury je navržen akviziční modul včetně obvodové realizace a vytvoření plošného spoje. Zhotovený plošný spoj je osazen a připraven pro další testování. Dále je navržen příslušný firmware pro příjem a vysílání signálu a získávání naměřených dat. Obdržené výsledky jsou ur

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Yang, Xi. "Filter-less Architecture for Multi-Carrier Software Defined Radio Transmitters." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1321403816.

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Sperlich, Roland. "Adaptive power amplifier linearization by digital pre-distortion with narrowband feedback using genetic algorithms." Diss., Available online, Georgia Institute of Technology, 2005, 2005. http://etd.gatech.edu/theses/available/etd-06232005-152633/.

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Thesis (Ph. D.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2006.<br>Leach, William M., Committee Member ; Sills, James A., Committee Member ; Kenney, J. Stevenson, Committee Chair ; Zhou, G. Tong, Committee Co-Chair ; Fenney, Robert K., Committee Member.

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Fu, Zhu. "Digital Pre-distortion for Interference Reduction in Dynamic Spectrum Access Networks." Digital WPI, 2014. https://digitalcommons.wpi.edu/etd-dissertations/152.

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Given the ever increasing reliance of todayâ€™s society on ubiquitous wireless access, the paradigm of dynamic spectrum access (DSA) as been proposed and implemented for utilizing the limited wireless spectrum more efficiently. Orthogonal frequency division multiplexing (OFDM) is growing in popularity for adoption into wireless services employing DSA frame- work, due to its high bandwidth efficiency and resiliency to multipath fading. While these advantages have been proven for many wireless applications, including LTE-Advanced and numerous IEEE wireless standards, one potential drawback of OF

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Brandon, Mathilde. "Optimisation conjointe de méthodes de linéarisation de l'émetteur pour des modulations multi-porteuses." Phd thesis, Université de Cergy Pontoise, 2012. http://tel.archives-ouvertes.fr/tel-00762747.

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Les modulations multiporteuses apparaissent aujourd'hui comme une technologie éprouvée pour la transmission de données à haut-débits sur des canaux pouvant être très perturbés. L'OFDM (Orthogonal Frequency Division Multiplexing) a d'ailleurs été choisie dans plusieurs normes de télécommunications (ADSL, Wi-Max, IEEE 802.11a/g/n, LTE, DVB,...). Cependant un des inconvénients de ce type de modulation est la forte variation de la puissance instantanée à transmettre. Cette propriété rend ces modulations très sensibles aux non-linéarités des composants analogiques, en particulier celles de l'amplif

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Warm, Stefan. "Electronic predistortion strategies for directly modulated laser systems." Aachen Shaker, 2009. http://d-nb.info/997825057/04.

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Qian, Hua. "Power Efficiency Improvements for Wireless Transmissions." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/11649.

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Many communications signal formats are not power efficient because of their large peak-to-average power ratios (PARs). Moreover, in the presence of nonlinear devices such as power amplifiers (PAs) or mixers, the non-constant-modulus signals may generate both in-band distortion and out-of-band interference. Backing off the signal to the linear region of the device further reduces the system power efficiency. To improve the power efficiency of the communication system, one can pursue two approaches: i) linearize the PA; ii) reduce the high PAR of the input signal. In this dissertation, we fir

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Pojani, Giacomo. "Implementazione su fpga di un pre-distorsore digitale a banda larga per sistemi a microonde di backhaul." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/7637/.

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The development of next generation microwave technology for backhauling systems is driven by an increasing capacity demand. In order to provide higher data rates and throughputs over a point-to-point link, a cost-effective performance improvement is enabled by an enhanced energy-efficiency of the transmit power amplification stage, whereas a combination of spectrally efficient modulation formats and wider bandwidths is supported by amplifiers that fulfil strict constraints in terms of linearity. An optimal trade-off between these conflicting requirements can be achieved by resorting to

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Hamoud, Houssam Eddine. "Linéarisation par pré-distorsion numérique d'amplificateurs de puissance pour les nouvelles générations des systèmes de télécommunications." Thesis, Limoges, 2019. http://www.theses.fr/2019LIMO0110.

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Les systèmes de communication modernes convergent vers un fonctionnement multi-standard associé à des formats de modulation à fort PAPR où l’amplificateur de puissance doit être d’abord optimisé en rendement et où la linéarité sera corrigée ensuite par l’ajout d’un prédistorteur. Si cette solution semble fonctionnelle, elle parait inadaptée et peu efficace sur les systèmes 5G où les largeurs de bandes visées posent à la fois des problèmes d’architecture (complexité de la voie d’observation) etde précision des modèles comportementaux usuels basés sur une simplification de la série de Volterra d

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