Sökning: "Cognitive Radio"

Visar resultat 11 - 15 av 65 uppsatser innehållade orden Cognitive Radio.

  1. 11. Study and Comparison of Spectrum Sensing Methods

    Master-uppsats, KTH/Skolan för informations- och kommunikationsteknik (ICT)

    Författare :Huimei Lu; [2014]
    Nyckelord :cognitive radio; spectrum sensing; PSE; MTSE; FBSE;

    Sammanfattning : Efficient utilization of frequency bands has attracted more and more attention. Most of the licensed spectrum nowadays is under-utilized and some unlicensed services are allowed to use the available spectrum without causing harmful interference to the primary users. Therefore, unlicensed users should be able to detect spectrum holes reliably. LÄS MER

  3. 12. Performance Analysis of 3-hop using DAF and DF over 2-hop Relaying Protocols

    Master-uppsats, Blekinge Tekniska Högskola/Sektionen för ingenjörsvetenskap

    Författare :Faisal Mehmood; Muneeb Ejaz; [2013]
    Nyckelord :Bit Error Rate; Cognitive Radio; Decode Amplify and Forward; Energy Detection; Probability of Detection; Rayleigh Fading; Relay Network;

    Sammanfattning : In wireless Communication, the need of radio spectrum increases nowadays. But in the system we are losing approximately 82-86% of spectrum most of the time due to the absence of Primary User (PU). To overcome this issue Cognitive Radio (CR) is an admirable approach. LÄS MER

  4. 13. Minding the spectrum gaps : First steps toward developing a distributed white space sensor grid for cognitive radios

    Master-uppsats, KTH/Radio Systems Laboratory (RS Lab)

    Författare :Javier Lara Peinado; [2013]
    Nyckelord :cognitive radio; cooperative spectrum sensing; energy detector; kognitiv radio; kooperativa spektrum avkänning; energi detektor;

    Sammanfattning : The idea that the radio spectrum is growing ever more scarce has become commonplace, and is being reinforced by the recent bidding wars among telecom operators. New wireless applications tend to be deployed in the relatively narrow unlicensed frequency bands, worsening the problem of interference for all users. LÄS MER

  5. 14. Spectrum sensing based on specialized microcontroller based white space sensors : Measuring spectrum occupancy using a distributed sensor grid

    Master-uppsats, KTH/Radio Systems Laboratory (RS Lab)

    Författare :Julia Alba Tormo Peiró; [2013]
    Nyckelord :Cognitive radio; spectrum sensing; dynamic spectrum access; radio spectrum utilization; Kognitiv radio; spectrum sensing; dynamiskt spektrum tillgång; radiospektrum utnyttjas;

    Sammanfattning : The continuing increase in the adoption and use of wireless technology aggravates the problem of spectrum scarcity due to the way we utilize the spectrum. The radio spectrum is a limited resource regulated by governmental agencies according to a fixed spectrum assignment policy. LÄS MER

  7. 15. Optimization of Cognitive Radio in NLoS Backhauling of Small Cells

    Master-uppsats, Blekinge Tekniska Högskola/Sektionen för ingenjörsvetenskap

    Författare :Paresh Kumar Lakhani; Ajay Gul; Fahad Naveed; [2013]
    Nyckelord :Backhauling; Cognitive Radio; Link Budget; Long Term Evolution LTE ; Non Line of Sight NLoS ; Small Cell.;

    Sammanfattning : The increasing demand of data access and user experience result in deployment of new technologies (3G, LTE, WiMAX, Cognitive Radio), Long Term Evolution (LTE) is one of them which promises to fulfill the variable demand of subscribers through small cells instead of macro cells. The backhauling of the small cells in densely populated urban area is again a very difficult task to handle with Government regulations (eccentricities) and restrictions. LÄS MER