Search for dissertations about: "nonlinear architecture"

Showing result 1 - 5 of 33 swedish dissertations containing the words nonlinear architecture.

  1. 1. Linear Transmitter Design Using Nonlinear Analog Circuits

    University dissertation from Department of Electroscience, Lund University

    Author : Bo Shi; [2001]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Telecommunication engineering; Elektronik och elektroteknik; Electronics and Electrical technology; BiCMOS.; CMOS; ASIC; Radio-frequency circuits; Translinear circuits; RF power amplifier linearization; Linear transmitter; Nonlinear analog circuits; Telekommunikationsteknik;

    Abstract : This dissertation deals with analog techniques at both the architecture and circuit design levels for designing power efficient linear radio-frequency (RF) transmitters. The use of nonlinear analog integrated circuits to implement certain critical signal processing functions for the multiplicative feedback and LINC techniques is investigated with the aim of improving the system performance in terms of complexity, linearity and power efficiency. READ MORE

  2. 2. Digital Predistortion for the Linearization of Power Amplifiers

    University dissertation from Department of Electroscience, Lund University

    Author : Jessica Chani Cahuana; [2015]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; behavioral model; Volterra series; nonlinear; digital predistortion; Doherty power amplifier; power amplifier; efficiency;

    Abstract : High efficiency and linearity are indispensable requirements of power amplifiers. Unfortunately they are difficult to obtain simultaneously, since high efficiency PAs are nonlinear and linear PAs may have low efficiency. READ MORE

  3. 3. Fully Nonlinear Unsteady Three-Dimensional Boundary Element Method for Ship Motions in Waves

    University dissertation from Department of Electroscience, Lund University

    Author : Martin Kjellberg; [2013]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; BEM; potential flow; MEL; ship motions; free surface; wave resistance; fully nonlinear; time-dependent;

    Abstract : The prediction of the behavior of ships in a seaway has been an important topic in ship design since the beginning of modern naval architecture. In recent years, computer simulations using numerical methods based on mathematical models of the ship hydrodynamics problem has become a valuable tool for researchers and engineers working in this field. READ MORE

  4. 4. Tailored fiber lasers and their use in nonlinear optics

    University dissertation from Stockholm : KTH Royal Institute of Technology

    Author : Peter Zeil; Fredrik Laurell; Andy Clarkson; [2015]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Physics; Fysik;

    Abstract : The objective of this thesis work was to develop tailored fiber lasers, which meet the pump requirement for efficient continuous-wave (cw) frequency conversion to the visible and the mid-infrared wavelength regimes: a stable, high-power, wavelength-tunable, narrow-linewidth output in a single polarization. As a first step, the prospect of tuning ytterbium fiber lasers over an unprecedented wavelength range, from 980nm to 1100nm, was investigated. READ MORE

  5. 5. Behavioral modeling of wireless transmitters for distortion mitigation

    University dissertation from Stockholm : KTH Royal Institute of Technology

    Author : Ali Soltani Tehrani; [2012]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; nonlinear models; wireless communications.; computational complexity; I Q imbalance; digital predistortion; Volterra series; transmitter; power amplifier; Behavioral modeling;

    Abstract : As the demand for high speed and reliable wireless communication increases, theimportance of having a linear transmitter has enhanced. Distortions created by thetransmitter, such as power amplifier nonlinearity and I/Q imbalance, diminish thefidelity and limit the performance of wireless systems, if left undealt with. READ MORE