Sökning: "channel bandwidth adaptation"

Visar resultat 1 - 5 av 6 avhandlingar innehållade orden channel bandwidth adaptation.

  1. 1. Enhancing P2P Systems over Wireless Mesh Networks

    Författare :Marcel Cavalcanti de Castro; Andreas Kassler; Edmundo Monteiro; Karlstads universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; peer-to-peer overlay; wireless mesh networks; peer selection; channel assignment; routing; optimization; adjacent channel interference; channel bandwidth adaptation; Datavetenskap; Computer Science;

    Sammanfattning : Due to its ability to deliver scalable and fault-tolerant solutions, applications based on the peer-to-peer (P2P) paradigm are used by millions of users on the internet. Recently, wireless mesh networks (WMNs) have attracted a lot of interest from both academia and industry, because of their potential to provide flexible and alternative broadband wireless internet connectivity. LÄS MER

  3. 2. Channel Estimation and Prediction for MIMO OFDM Systems : Key Design and Performance Aspects of Kalman-based Algorithms

    Författare :Daniel Aronsson; Mikael Sternad; Ove Edfors; Uppsala universitet; []
    Nyckelord :channel estimation; channel prediction; OFDM; Kalman filtering; Electrical Engineering with specialization in Signal Processing; Elektroteknik med inriktning mot signalbehandling;

    Sammanfattning : Wireless broadband systems based on Orthogonal Frequency Division Multiplexing (OFDM) are being introduced to meet demands for high data transfer rates. In multiple users systems, the available bandwidth has to be shared efficiently by several users. The radio channel quality will fluctuate, or fade, as users move. LÄS MER

  4. 3. Introducing Power Control and Link Adaptation in Flooding-based Underwater Networks : Extending the applicability of flooding-based routing protocols

    Författare :Elias Erstorp; Jacob Kuttenkeuler; Roald Otnes; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Acoustic Underwater Networks; Distributed Power Control; Link Adaptation; Farkostteknik; Vehicle and Maritime Engineering;

    Sammanfattning : Underwater communication and networking are key enabling technologies for many current and future marine applications. Generally, the envisioned applications include environmental monitoring, aquaculture, and surveillance. LÄS MER

  5. 4. Limited Feedback Information in Wireless Communications : Transmission Schemes and Performance Bounds

    Författare :Thanh Tùng Kim; Mikael Skoglund; Hesham El Gamal; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Diversity-multiplexing tradeoff; Large deviation analysis; Limited feedback; MIMO channels; Relay channels; Telecommunication; Telekommunikation;

    Sammanfattning : This thesis studies some fundamental aspects of wireless systems with partial channel state information at the transmitter (CSIT), with a special emphasis on the high signal-to-noise ratio (SNR) regime. The first contribution is a study on multi-layer variable-rate communication systems with quantized feedback, where the expected rate is chosen as the performance measure. LÄS MER

  7. 5. Augmenting L1 Adaptive Control of Piecewise Constant Type to Aerial Vehicles

    Författare :Anders Pettersson; Institutionen för reglerteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : In aerial vehicle control design, the industrial baseline is to use robust control methods together with gain-scheduling to cover the full airspeed and altitude flight envelope. An adaptive controller could possibly add value by increasing performance while keeping robustness to deviation from nominal assumptions. LÄS MER