Sökning: "channel estimate"

Visar resultat 1 - 5 av 75 uppsatser innehållade orden channel estimate.

  1. 1. Network Orientation and Segmentation Refinement Using Machine Learning

    Master-uppsats, Linköpings universitet/Institutionen för medicinsk teknik

    Författare :Michael Nilsson; Jonatan Kentson; [2023]
    Nyckelord :deep learning; semantic segmentation; orientation learning; road networks; retina networks;

    Sammanfattning : Network mapping is used to extract the coordinates of a network's components in an image. Furthermore, machine learning algorithms have demonstrated their efficacy in advancing the field of network mapping across various domains, including mapping of road networks and blood vessel networks. LÄS MER

  3. 2. ISAR Imaging Enhancement Without High-Resolution Ground Truth

    Master-uppsats, Linköpings universitet/Datorseende

    Författare :Moltas Enåkander; [2023]
    Nyckelord :SAR; SAR Imaging; ISAR; ISAR Imaging; Machine learning; Convolutional neural network; CNN; neural network; Super resolution; Unsupervised learning;

    Sammanfattning : In synthetic aperture radar (SAR) and inverse synthetic aperture radar (ISAR), an imaging radar emits electromagnetic waves of varying frequencies towards a target and the backscattered waves are collected. By either moving the radar antenna or rotating the target and combining the collected waves, a much longer synthetic aperture can be created. LÄS MER

  4. 3. Adaptive Fishway Design : Designing a Bypass Channel to Fit Large Discharge Fluctuations

    Master-uppsats, KTH/Hållbar utveckling, miljövetenskap och teknik

    Författare :Melina Sattelmeier; [2023]
    Nyckelord :;

    Sammanfattning : Especially with regard to achieving the goals of the European Water Framework Directive, the construction of fishways is becoming more prominent in Sweden's hydraulic engineering sector. Particularly the importance of nature-like bypass channels is increasing, being the type of fishway that is currently implemented in most cases of small scale hydropower. LÄS MER

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

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

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

    Sammanfattning : 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. LÄS MER

  7. 5. Undervattenskommunikation : En turboutjämnares förmåga att skatta kanalen

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Signaler och system

    Författare :Marcus Hellström; [2023]
    Nyckelord :undervattenskommunikation; turboutjämning;

    Sammanfattning : Despite advancements in wireless communication worldwide, wireless underwater communication remains a significant challenge. The marine environment presents unique and challenging conditions for wireless communication, rendering radio waves unsuitable for long-distance underwater communication due to the water's absorption of electromagnetic waves. LÄS MER