Sökning: "rayleigh"

Visar resultat 1 - 5 av 93 uppsatser innehållade ordet rayleigh.

1. 1. 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

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

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

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

   Sammanfattning : 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. LÄS MER

4. 3. Development of a Novel Method for Automotive On-board Transmitter EMC Immunity Testing

   Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Elektricitetslära

   Författare :Ludvig Holm; [2023]
   Nyckelord :Electromagnetic Compatibility EMC ; Reverberation Chamber RC ; Vibrating Intrinsic Reverberation Chamber VIRC ; Cumulative Distribution Function CDF ; Rayleigh Distribution; Immunity testing; On-board Transmitter OBT ; Reverberating On-board Transmitter ROBT ; Expected Isotropicity; Delta-DoF; Elektromagnetisk Kompatibilitet; Modväxlande Kammare; Kumulativ Fördelningsfunktion; Rayleighfördelning; Immunitetstest; Simulerad Strålningskälla i Fordon ISO 11451-3:2015 ; Modväxlande Simulerad Strålningskälla; Förväntad Isotropicitet;

   Sammanfattning : As the automotive industry advances through technology integration, components are designed to operate at increasingly higher frequencies. Consequently, there will be an increasing demand for automotive electromagnetic compatibility (EMC) testing. LÄS MER

5. 4. Development of a model for ionospheric instabilities in the equatorial region

   Master-uppsats, Luleå tekniska universitet/Rymdteknik

   Författare :Thea Lepage; [2023]
   Nyckelord :;

   Sammanfattning : This work is part of a bigger project on analyzing the ionospheric dynamics in the equatorial region using simulations. The main objective of this study is to determine and characterize the parameters needed to trigger instabilities and thus the formation of plasma bubbles. LÄS MER

7. 5. Performance Analysis of STTC-Based MIMO Under Cognitive RadioScenarios

   Master-uppsats, Blekinge Tekniska Högskola/Institutionen för datavetenskap

   Författare :Sanjana Kankantee; Sai Praneeth Reddy Ganta; [2023]
   Nyckelord :Space-time trellis coding; MIMO; Cognitive radio; Performance; Bit error rate; Diversity; AWGN; Rayleigh fading; Detection; Spectrum.;

   Sammanfattning : This thesis presents a comprehensive investigation into improving wireless transmission rates and reliability through the implementation of Space Time Trellis Codes(STTC). The study focuses on enhancing the coding gain, diversity gain, and flexible transmission capabilities, which are crucial for Error-Correcting Codes (ECC)in wireless communications. LÄS MER