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Visar resultat 1 - 5 av 32 avhandlingar som matchar ovanstående sökkriterier.

1. 1. Signal Processing for Spectroscopic Applications

   Författare :Erik Gudmundson; Peter Stoica; Peter Händel; Stoica Stoica; Uppsala universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; spectral estimation; spectroscopic techniques; MRI; NMR; NQR; signal detection; parameter estimation; missing data; non-uniform sampling; damped sinusoids; detection of explosives; T1-mapping; relaxometry; brain imaging; skin imaging; blood velocity estimation; medical ultrasound; Signal processing; Signalbehandling; Elektroteknik med inriktning mot reglerteknik; Electrical Engineering with specialization in Automatic Control;

   Sammanfattning : Spectroscopic techniques allow for studies of materials and organisms on the atomic and molecular level. Examples of such techniques are nuclear magnetic resonance (NMR) spectroscopy—one of the principal techniques to obtain physical, chemical, electronic and structural information about molecules—and magnetic resonance imaging (MRI)—an important medical imaging technique for, e. LÄS MER

3. 2. On System Identification and Acoustic Echo Cancellation

   Författare :Per Åhgren; Peter Stoica; Peter Händel; Uppsala universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; acoustic echo cancellation; stereophonic acoustic echo cancellation; doubletalk detection; adaptive beamforming; adaptive filtering; system identification; recursive system identification; loudspeaker impulse response estimation; Signal processing; Signalbehandling;

   Sammanfattning : The topic of acoustic echo cancellation has received a lot of interest over the years. Even though the topic is relatively old, the increasing demand for hands-free telephony has made it more important than ever before. LÄS MER

4. 3. Characterisation, Modelling and Digital Pre-DistortionTechniques for RF Transmitters in Wireless Systems

   Författare :Mahmoud Alizadeh; Peter Händel; Daniel Rönnow; Noureddine Boulejfen; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; RF power amplifiers; non-linearity; memory effects; Behavioral modelling; MIMO; Digital pre-distortion; Electrical Engineering; Elektro- och systemteknik; Intelligent industri;

   Sammanfattning : Wireless systems have become an inevitable part of modern technologies serving humankind. The rapid growth towards large dimensional systems, e.g. LÄS MER

5. 4. Characterization and Linearization of Multi-channel RF Power Amplifiers

   Författare :Shoaib Amin Amin; Peter Händel; Daniel Rönnow; Ulf Gustavsson; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electrical Engineering; Elektro- och systemteknik;

   Sammanfattning : The demands for high data rates and broadband wireless access require the development of wireless systems that can support wide and multi-band signals. To deploy these signals, new radio frequency (RF) front-ends are required which impose new challenges in terms of power consumption efficiency and sources of distortion e.g., nonlinearity. LÄS MER

7. 5. Characterization and Linearization of Multi-band Multi-channel RF Power Amplifiers

   Författare :Shoaib Amin; Peter Händel; Daniel Rönnow; Christian Fager; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electrical Engineering; Elektro- och systemteknik; Intelligent industri;

   Sammanfattning : The World today is deeply transformed by the advancement in wireless technology. The envision of a smart society where interactions between physical and virtual dimensions of life are intertwined and where human interaction is mediated by machines, e.g., smart phones, demands increasingly more data traffic. LÄS MER