Essays about: "Spectral effektivitet"

Showing result 1 - 5 of 16 essays containing the words Spectral effektivitet.

1. 1. Performance Analysis of the Uplink of Multi-antenna Systems Operating in Aging Channels

   University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS)

   Author : Prasetyo Putranto; [2023]
   Keywords : Channel aging; Pilot spacing; Rayleigh; Rician; Spectral efficiency; Uncrewed aerial vehicles; Kanalåldring; Pilotavstånd; Rayleigh; Rician; Spectral effektivitet; Obemannade flygfordon;

   Abstract : In wireless communications, employing pilot symbols enables to estimate the state of the wireless channel at the expense of decreasing the number of symbols available for transmitting data. Addressing this trade-off is particularly challenging when the channel changes rapidly over time, since channel estimates become obsolete over short transmission periods. READ MORE

3. 2. Channel Estimation and Power Control Algorithms in the Presence of Channel Aging

   University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS)

   Author : Yan Bixing; [2023]
   Keywords : Fading channel; auto-regressive model; power allocation; uncrewed aerial vehicle networks; Fading kanal; auto-regressiv modell; krafttilldelning; obemannade flygfordonsnätverk;

   Abstract : Power allocation algorithms that determine how much power should be allocated to pilot and data symbols play an important role in addressing the trade-off between accurate channel estimation and high high spectral efficiency for data symbols in the presence of time-varying fading channels. Dealing with this trade-off is highly non-trivial when the channel changes or ages rapidly in time. READ MORE

4. 3. Real-Time Continuous Euclidean Distance Fields for Large Indoor Environments

   University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS)

   Author : Erik Warberg; [2023]
   Keywords : Room segmentation; Gaussian processes; Euclidean distance fields; mapping; line segment detection; mobile robots; spectral clustering; Rumssegmentering; Gaussiska processer; Euklidiska avståndsfält; kartläggning; detektering av linjesegment; mobila robotar; spektral klustring;

   Abstract : Real-time spatial awareness is essential in areas such as robotics and autonomous navigation. However, as environments expand and become increasingly complex, maintaining both a low computational load and high mapping accuracy remains a significant challenge. READ MORE

5. 4. Personalized Federated Learning for mmWave Beam Prediction Using Non-IID Sub-6 GHz Channels

   University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS)

   Author : Yuan Cheng; [2022]
   Keywords : Personalized Federated Learning; Millimeter wave; Beamforming; DeepMIMO; Non-IID; Personaliserad Federad Inlärning; Millimetervågor; Strålformning; DeepMIMO; Icke-IID;

   Abstract : While it is difficult for base stations to estimate the millimeter wave (mmWave) channels and find the optimal mmWave beam for user equipments (UEs) quickly, the sub-6 GHz channels which are usually easier to obtain and more robust to blockages could be used to reduce the time before initial access and enhance the reliability of mmWave communication. Considering that the channel information is collected by a massive number of radio base stations and would be sensitive to privacy and security, Federated Learning (FL) is a match for this use case. READ MORE

6. 5. Extrapolation of polynomial nets and their generalization guarantees

   University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS)

   Author : Yongtao Wu; [2022]
   Keywords : Polynomial neural networks; Neural tangent kernel; Extrapolation; Polynomial neural networks; Neural tangent kernel; Extrapolation;

   Abstract : Polynomial neural networks (NNs-Hp) have recently demonstrated high expressivity and efficiency across several tasks. However, a theoretical explanation toward such success is still unclear, especially when compared to the classical neural networks. READ MORE