Sökning: "radio series"

Visar resultat 11 - 15 av 97 avhandlingar innehållade orden radio series.

  1. 11. Gaussian Processes for Positioning Using Radio Signal Strength Measurements

    Författare :Yuxin Zhao; Fredrik Gunnarsson; Fredrik Gustafsson; Carsten Fritsche; Simo Särkkä; Linköpings universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Gaussian process; positioning; radio signals;

    Sammanfattning : Estimation of unknown parameters is considered as one of the major research areas in statistical signal processing. In the most recent decades, approaches in estimation theory have become more and more attractive in practical applications. LÄS MER

  3. 12. On Radio Wave Propagation Measurements and Modelling for Cellular Mobile Radio Networks

    Författare :Erik Östlin; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Field strength measurements; path loss prediction; point-to-area; Recommendation ITU-R P.1546; artificial neural network; large- and small-scale fading characteristics;

    Sammanfattning : To support the continuously increasing number of mobile telephone users around the world, mobile communication systems have become more advanced and sophisticated in their designs. As a result of the great success with the second generation mobile radio networks, deployment of the third and development of fourth generations, the demand for higher data rates to support available services, such as internet connection, video telephony and personal navigation systems, is ever growing. LÄS MER

  4. 13. Digital Compensation Techniques for Power Amplifiers in Radio Transmitters

    Författare :Jessica Chani Cahuana; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; nonlinear system; linearization; power amplifier; iterative learning control; digital predistortion; Volterra series;

    Sammanfattning : Power amplifiers (PAs) are vital components in radio transmitters because they are responsible to amplify the low power communication signals to power levels suitable for transmission. Important requirements of PAs are high efficiency and linearity. Unfortunately, there is a tradeoff between efficiency and linearity. LÄS MER

  5. 14. Secure Tactical Communications for Inter-Organizational Collaboration : The Role of Emerging Information and Communications Technology, Privacy Issues, and Cyber Threats on the Digital Battlefield

    Författare :Johan Sigholm; Martin Norsell; Anne Persson; Gurpreet Dhillon; Högskolan i Skövde; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Försvarssystem; Systems science for defence and security; Information Systems; Informationssystem IS ;

    Sammanfattning : The development within the area of information and communications technology (ICT) has been rapid during the last couple of decades. Advancements in mobile technology, such as smartphones and other portable devices with embedded sensors, rapid expansion of communications infrastructure, and increased spectrum utilization, has had a major impact on civilian society, but increasingly also on professional organizations such as the Swedish Armed Forces. LÄS MER

  7. 15. A Software Framework for Prioritized Spectrum Access in Heterogeneous Cognitive Radio Networks

    Författare :Yong Yao; Blekinge Tekniska Högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Cognitive Radio Networks; Queueing Modelling; Spectrum Decision; Fuzzy-Logic; Cellular Network; Ad-Hoc Network; Mesh Network;

    Sammanfattning : Today, the radio spectrum is rarely fully utilized. This problem is valid in more domains, e.g., time, frequency and geographical location. LÄS MER