Sökning: "directional antennas"

Visar resultat 16 - 20 av 21 uppsatser innehållade orden directional antennas.

  1. 16. Directional Spectrum Sensing and Transmission Using a Sector Antenna

    Master-uppsats, Institutionen för informationsteknologi och medier

    Författare :Bilal Hasan Qureshi; [2012]
    Nyckelord :Spectrum Sensing; Ray-tracing and Sector Antennas;

    Sammanfattning : Spectrum sensing plays a key role for radio resource awareness in cognitive radio. To enhance the capabilities of cognitive radio nodes, exploiting the spatial resource in addition to frequency and time re-sources seems reasonable. LÄS MER

  3. 17. Modeling the Behavior of an Electronically Switchable Directional Antenna for Wireless Sensor Networks

    Master-uppsats, Blekinge Tekniska Högskola/Sektionen för ingenjörsvetenskap

    Författare :Geletu Biruk Silase; [2011]
    Nyckelord :Wireless Sensor Networks; Directional Antennas; Non-parametric Probability Density Function Estimation; Spatial Interpolation;

    Sammanfattning : Reducing power consumption is among the top concerns in Wireless Sensor Networks, as the lifetime of a Wireless Sensor Network depends on its power consumption. Directional antennas help achieve this goal contrary to the commonly used omnidirectional antennas that radiate electromagnetic power equally in all directions, by concentrating the radiated electromagnetic power only in particular directions. LÄS MER

  4. 18. Lokalisering av skidor i lössnö : Självständigt arbete i Teknisk Fysik

    Kandidat-uppsats, Institutionen för teknikvetenskaper

    Författare :Fredrik Trella; [2011]
    Nyckelord :skis; positining; 433; Atmel; ATMega; AVR; sender; receiver; byte loss rate; RSSI; Yagi; RF; USART; UART; USI; skidor; lokalisering; positionering; 433; Atmel; ATMega; AVR; sändare; mottagare; byte loss rate; RSSI; Yagi; RF; USART; UART; USI;

    Sammanfattning : This report studies the possibility of using some sort of radio sender and transmitter in order to position skis lost in powder snow. It is concluded that a RF-solution on the 433 MHz frequency should be the most efficient. LÄS MER

  5. 19. BUILDING AND EXPERIMENTALLYEVALUATING A SMART ANTENNA FOR LOWPOWER WIRELESS COMMUNICATION

    Magister-uppsats, Akademin för innovation, design och teknik

    Författare :Erik Öström; [2010]
    Nyckelord :Low Power; Smart; Antenna; SPIDA; Experimental; Parasitic element; wireless; communication;

    Sammanfattning : In wireless communication there is commonly much unnecessarycommunication made in directions not pointing towards the recipient. Normallyomni directional antennas are being used which sends the same amount ofenergy in all directions equally. LÄS MER

  7. 20. Building and experimentally evaluating a smart antenna for low power wireless communication

    Magister-uppsats, Akademin för innovation, design och teknik

    Författare :Erik Öström; [2010]
    Nyckelord :smart; antenna; SPIDA; wireless; communication; low power; parasitic element; SICS;

    Sammanfattning : In wireless communication there is commonly much unnecessary communication made in directions not pointing towards the recipient. Normally omni directional antennas are being used which sends the same amount of energy in all directions equally. LÄS MER