Sökning: "path-loss measurements"

Visar resultat 1 - 5 av 13 avhandlingar innehållade orden path-loss measurements.

  1. 1. 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

  3. 2. Verification of wireless communication performance and robustness for automotive applications

    Författare :Mikael Nilsson; Kommunikationsteknologi; []
    Nyckelord :Vehicle-to-Vehicle; V2V; channel modeling; path loss; two-ray; obstruction; large scale fading; shadow fading; multiple links; diversity; correlation; over-the-air; OTA; multi-probe; multipath propagation simulator; fading emulation;

    Sammanfattning : Today's test methods used for verifying the performance and robustness of automotive applications using wireless communication are often based on fieldtrails, which are time consuming, costly, and not repeatable. Therefore, there is an urgent need for new verification methods that can be performed in lab environment, where the realistic radio propagation environment can be emulated. LÄS MER

  4. 3. Radio Resource Management in Bunched Personal Communication Systems

    Författare :Miguel Berg; KTH; []
    Nyckelord :radio resource management; dynamic channel allocation; power control; interference avoidance; link-gain matrix; path-loss measurements; microcells; mobile positioning; trilateration;

    Sammanfattning : The traditional way of increasing capacity in a wirelesscommunication system has been cell splitting and fixedchannel-allocation based on prediction tools. However, theplanning complexity increases rapidly with the number of cellsand the method is not suitable for the large temporal andspatial traffic variations expected in the future. LÄS MER

  5. 4. Reverberation Chamber Characterizations for Passive and Active OTA Measurements

    Författare :Chen Xiaoming; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : Reverberation chamber (RC) has drawn more and more attention as a multipath emulator over the past decade. It has been used for antenna efficiency measurements. It has also been used to measure diversity gain and multi-input multi-output (MIMO) capacity using multi-port antenna. LÄS MER

  7. 5. Wireless measurement systems for health and safety

    Författare :Torbjörn Ödman; Maria Lindén; Dag Stranneby; Mälardalens högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; elektronik; Electronics;

    Sammanfattning : This licentiate thesis presents an advanced wireless system, built on a single hardware platform, for applications in medicine and health. In order to design a single system, adaptable for different context, an accurate system specification is required. LÄS MER