Sökning: "Cognitive Relay Networks"

Visar resultat 6 - 10 av 12 uppsatser innehållade orden Cognitive Relay Networks.

  1. 6. Performance Evaluation of 2-Hop and 3-Hop Relay Network using DF, AF and DAF Relaying Protocols

    Master-uppsats, Blekinge Tekniska Högskola/Sektionen för ingenjörsvetenskap

    Författare :Mohsin Kamal; Theera Yukong; [2012]
    Nyckelord :Amplify and Forward; Decode and Forward; Decode Amplify and Forward; Relay network; 2-hop and 3-hop cognitive radio networks ;

    Sammanfattning : Cognitive radio is an evolving wireless technology employed to increase the frequency spectrum utilization of the limited spectral resources. Cooperative communications has been established as a potential method of solving the fading effects in wireless communications, improving the reliability of network performance, network throughput, and adaptability. LÄS MER

  3. 7. Capacity Analysis of Cognitive Radio Relay Networks under Transmission and Interference Power Constraints

    Master-uppsats, Blekinge Tekniska Högskola/Sektionen för ingenjörsvetenskap

    Författare :Abhijith Gopalakrishna; [2012]
    Nyckelord :effective capacity; outage capacity; ergodic capacity; cognitive radio; relay networks;

    Sammanfattning : This thesis investigates the performance of cognitive radio relay networks (CRRN) in Rayleigh fading channel under various power constraints. Here spectrum sharing approach is considered, whereby a secondary user (SU) may be allowed to transmit simultaneously with a primary user (PU) as long as SU interference to PU remains below a tolerable level. LÄS MER

  4. 8. PERFORMANCE ANALYSIS OF HYBRID DECODE-AMPLIFY FORWARD RELAYING PROTOCOLS IN COGNITIVE NETWORKS

    Master-uppsats, Blekinge Tekniska Högskola/Sektionen för ingenjörsvetenskap

    Författare :Awais Salman Qazi; Muhammad Shoaib; Muhammad Shahan Saleem; [2012]
    Nyckelord :MIMOs; PU; SU; CRs; CC; Maximum Likelihood estimation ;

    Sammanfattning : Nowadays, the world has observed a tremendous increase in the demand of radio spectrum in wireless communication. Services like broadband internet, telecommunication, videoconferencing, mobile IP, online multimedia gaming and other applications have been deployed using wireless services. LÄS MER

  5. 9. Spectrum Sensing of Cognitive Radio Networks using Amplify and Forward Relay over Correlated Nakagami-m Fading Channel

    Master-uppsats, Blekinge Tekniska Högskola/Sektionen för ingenjörsvetenskap

    Författare :Suman Dongol Maharjan; [2011]
    Nyckelord :Amplify-and-forward AF ; orthogonal space-time codes OSTBCs ; correlated Nakagami-m fading; detection probability; cognitive radio.;

    Sammanfattning : In the last ten years, we have been witnessing the vast growth in wireless communications due to the popularity of many wireless devices, mobiles, smart phones etc. As a result, the demand for high data rates, bandwidth, and spectrum utilization has increased. LÄS MER

  7. 10. 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