Sökning: "matching pursuit"

Visar resultat 1 - 5 av 12 uppsatser innehållade orden matching pursuit.

1. 1. Sparse Approximation of Spatial Channel Model with Dictionary Learning

   Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

   Författare :Matilda Zhou; [2022]
   Nyckelord :Spatial channel model SCM ; dictionary learning; compressive sensing CS ; discrete Fourier transform DFT ; overcomplete discrete Fourier transform ODFT ; Rumslig kanalmodell; ordbokslärning; kompressionsavkänning; diskret Fourier-transform; överkomplett diskret Fourier-transform;

   Sammanfattning : In large antenna systems, traditional channel estimation is costly and infeasible in some situations. Compressive sensing was proposed to estimate the channel with fewer measurements. Most of the previous work uses a predefined discrete Fourier transform matrix or overcomplete Fourier transform matrix to approximate the channel. LÄS MER

3. 2. Level 1 processing  algorithms of MicroCarb  microsatellite : Performance assessment of ISRF in-flight estimation through new algorithms

   Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

   Författare :Quentin Taupin; [2021]
   Nyckelord :;

   Sammanfattning : Facing global warming and its dramatic consequences, it is now of the utmost urgency to improve our understanding of the carbon cycle mechanisms through which global climate change unfolds. The MicroCarb mission will allow to accurately monitor CO2 global sources and sinks over the entire surface of the Earth. LÄS MER

4. 3. Variable Selection in High-Dimensional Data

   Kandidat-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

   Författare :Sarah Reichhuber; Johan Hallberg; [2021]
   Nyckelord :variable selection; variable selection methods; linear regression; high-dimensional data; variable importance;

   Sammanfattning : Estimating the variables of importance in inferentialmodelling is of significant interest in many fields of science,engineering, biology, medicine, finance and marketing. However,variable selection in high-dimensional data, where the number ofvariables is relatively large compared to the observed data points,is a major challenge and requires more research in order toenhance reliability and accuracy. LÄS MER

5. 4. The pursuit of sustainability in the oil industry : A case study in an international company

   Master-uppsats, Jönköping University/IHH, Företagsekonomi

   Författare :Visa Seinelä; Yara Galouk; [2020]
   Nyckelord :Sustainability; Triple bottom line; supply chain management; supplier selection; supplier development; reactive practices; proactive practices; sustainability barriers;

   Sammanfattning : Abstract Background: The oil industry is experiencing tremendous challenges due to the shifts in global markets and decreasing profits from oil. These challenges have steered companies to select more profitable investments and disregarding different matters of sustainability. LÄS MER

7. 5. Hybrid Beamforming Design for Full-Duplex mmWave Relaying Systems

   Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

   Författare :Zhe Wu; [2020]
   Nyckelord :mmWave; full-duplex; hybrid beamforming; self-interference cancellation; OMP; fast ADMM; convergence; mmwave; fullständig duplex; hybridstrålformning; självförstörande annullering; OMP; snabb ADMM; konvergens;

   Sammanfattning : With the tremendous growth in the mobile data traffic, the demand for highdata rate is increasing rapidly, and higher frequency resources shall be exploredto alleviate the congestion in the overcrowded spectrum, thus, the millimeterwave (mmWave) frequency resource ranging from 30 GHz to 300 GHz has beenrecognized as a nature fit for the fifth-generation (5G) and beyond network. Tocompensate the severe path-loss in the mmWave band as well to realize theefficient transmissions by applying the low-cost architecture, it is of intereststo investigate the beamforming schemes with large-scale antenna arrays andthe full-duplex (FD) relaying strategy, which are indispensable in the operationof directional signal transmission and the efficient spectrum utilization inthe mmWave transmission, respectively. LÄS MER