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Visar resultat 1 - 5 av 39 uppsatser som matchar ovanstående sökkriterier.

1. 1. Beam selection using Machine Learning in Massive MIMO systems

   Master-uppsats, Lunds universitet/Institutionen för elektro- och informationsteknik

   Författare :Simon Persson; [2023]
   Nyckelord :Massive MIMO; Beamforming; Machine Learning; 5G; NR; Antenna selection; Technology and Engineering;

   Sammanfattning : In mobile communications the demand for increased capacity and speeds is a constant. 5G NR is the latest generation which is now seeing widespread adoption. Crucial technologies like Massive MIMO and beamforming are enabled by the use of large antenna arrays. LÄS MER

3. 2. Whole-body SAR measurements of 5G mmW base stations in a reverberation chamber

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

   Författare :Jens Eilers Bischoff; [2022]
   Nyckelord :Reverberation chamber; Whole body specific absorption rate; 5G; Absorption; Antenna measurements; Modväxlande kammare; Helkroppsbaserad specifik absorptionshastighet; SAR; 5G; Absorption; Antennmätningar;

   Sammanfattning : This study presents a method for measurement of whole-body average specific absorption rate (WBSAR) of a millimeter wave (mmWave) antenna in a reverberation chamber. The method takes advantage of multiple radiated power measurements to estimate the power absorbed in a phantom placed in front of the antenna. LÄS MER

4. 3. Characterization of Passive Intermodulation Distortion in MultiBand FDD Radio Systems

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

   Författare :Tomás Soares da Costa; [2019]
   Nyckelord :;

   Sammanfattning : Intermodulation distortion (IMD) is a phenomenon that results in generation of spurious distortion signals when two or more signals of different frequencies pass through a nonlinear system. In general, IMD occurs in active circuits of a radio system, however, passive wireless components such as filters, transmission lines, connectors, antennas, attenuators etc. LÄS MER

5. 4. Beamforming Solutions for Efficient Link Setup and Link Maintenance in mmWave Communication Systems

   Master-uppsats, Lunds universitet/Institutionen för elektro- och informationsteknik

   Författare :Hesham Sharkas; Haruhi Echigo; [2019]
   Nyckelord :5G; Beamforming; Beam-forming; Beam Management; Beam Searching; Beam Sweeping; Codebook; code-book; Initial Access; MIMO; MillimeterWave; millimeter wave; mmWave; mm-Wave; mm Wave; Precoding; Slepian Beam; Synthesizer; Beam Synthesizer; Technology and Engineering;

   Sammanfattning : Millimeter wave (mmWave band) technology has gained a lot of attention in 5G communications, due to large amounts of spectrum being available in the mmWave frequency range. However, mmWave links suffer from severe free-space loss and atmospheric absorption. LÄS MER

7. 5. Investigate Redundancy In Sounding Reference Signal Based Channel Estimates

   Master-uppsats, Lunds universitet/Institutionen för elektro- och informationsteknik

   Författare :Nishanth Bhavani Sankar; Akshay Thakaramkunnath Ajayakumar; [2019]
   Nyckelord :Sounding Reference Signals; Multiple Input Multiple Output; 5th Generation; Time Division Duplexing; Lossless compression; Lossy Compression; Technology and Engineering;

   Sammanfattning : 5G supports enormous increase in data rate. Massive antenna beamforming is expected to play a key role in increasing capacity in case of multi-user MIMO and coverage in case of single-user MIMO. LÄS MER