Sökning: "cooperative spectrum sensing"

Visar resultat 6 - 9 av 9 uppsatser innehållade orden cooperative spectrum sensing.

  1. 6. Spectrum Sensing and Management in Cooperative Cognitive Radio

    Master-uppsats, Blekinge Tekniska Högskola/Sektionen för ingenjörsvetenskap

    Författare :Ghayoor Abbas Jafri; Ateeq Ur Rehman; Muhammad Tariq Sadiq; [2011]
    Nyckelord :Cognitive radio networks; Cooperative communication; Dynamic spectrum sharing; Cross layer design ; OC-MAC Protocol ; Opportunistic spectrum access; Spectrum sensing; Spectrum management;

    Sammanfattning : In the last few years, there has been enormous improvement in mobile communication services. Due to this rapid growth in the field of communications, the demand for wireless spectrum has increased rapidly. In the early days in order to remove the interference problem, the spectrum was assigned statically. LÄS MER

  3. 7. Analysis of OSTBC in Cooperative Cognitive Radio Networks using 2-hop DF Relaying Protocol

    Master-uppsats, Blekinge Tekniska Högskola/Sektionen för ingenjörsvetenskap

    Författare :Muhammad Mustafa Tahseen; MatiUllah Khan; Farhan Ullah; [2011]
    Nyckelord :Cognitive Radio; Cooperative Communication; Alamouti STBC; OSTBC; Rayleigh Fading; Energy Detector; DF Relay; Maximum Likelihood; MRC;

    Sammanfattning : To achieve cooperative diversity in cognitive radio network, Decode and Forward (DF) protocol is implemented at Cognitive Radios (CRs) using Orthogonal Space Time Block Coding (OSTBC). The 2-hop communication between source and destination is completed with the help of Cognitive Relays (CRs) using Multiple Input Multiple Output (MIMO) technology within the network. LÄS MER

  4. 8. Applying OSTBC in Cooperative Cognitive Radio Networks

    Master-uppsats, Blekinge Tekniska Högskola/Sektionen för ingenjörsvetenskap

    Författare :Hamid Shahzad; Jaishankar Botchu; [2010]
    Nyckelord :Cognitive Radio; Cooperative Communication; OSTBC; Rayleigh Fading; Alamouti STBC; AF Relay; MRC; Energy Detector ;

    Sammanfattning : In this report, we introduce cooperative spectrum sensing using orthogonal space time block coding (OSTBC) in order to achieve cooperative diversity in the cognitive radios (CRs) network. Transmit diversity or gain is achieved by introducing more than one antenna on the transmitter and receiver side, but in small electronic mobile devices it looks impractical. LÄS MER

  5. 9. DETECTION OF VACANT FREQUENCY BANDS IN COGNITIVE RADIO

    Master-uppsats, Blekinge Tekniska Högskola/Sektionen för ingenjörsvetenskap

    Författare :Ahmed Rehan; Ghous Yasir Arfat; [2010]
    Nyckelord :Cognitive radio; Spectrum Sensing ; Vacant Frequency bands; Spectrum Hole; Spectrum mobility; Cooperation strategies;

    Sammanfattning : Cognitive radio is an exciting promising technology which not only has the potential of dealing with the inflexible prerequisites but also the scarcity of the radio spectrum usage. Such an innovative and transforming technology presents an exemplar change in the design of wireless communication systems, as it allows the efficient utilization of the radio spectrum by transforming the capability to dispersed terminals or radio cells of radio sensing, active spectrum sharing and self-adaptation procedure. LÄS MER