Sökning: "Secondary networks"

Visar resultat 1 - 5 av 91 avhandlingar innehållade orden Secondary networks.

1. 1. Distributed Detection in Cognitive Radio Networks

   Författare :Ahti Ainomäe; Mats Bengtsson; Tõnu Trump; Olav Tirkkonen; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Cognitive Radio; distributed estimation; distributed detection; Diffusion LMS; Diffusion Networks; Adaptive Networks; Spectrum Sensing; Energy Detection; Random Matrix; Largest Eigenvalue Detection.; Electrical Engineering; Elektro- och systemteknik;

   Sammanfattning : One of the problems with the modern radio communication is the lack of availableradio frequencies. Recent studies have shown that, while the available licensed radiospectrum becomes more occupied, the assigned spectrum is significantly underutilized. LÄS MER

3. 2. Performance Analysis of Cognitive Radio Networks with Interference Constraints

   Författare :Hung Tran; Blekinge Tekniska Högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Cognitive Radio Networks; Spectrum Underlay Access; Interference Constraints; Cognitive Cooperative Radio Networks;

   Sammanfattning : To support the rapidly increasing number of mobile users and mobile multimedia services, and the related demands for bandwidth, wireless communication technology is facing a potentially scarcity of radio spectrum resources. However, spectrum measurement campaigns have shown that the shortage of radio spectrum is due to inefficient usage and inflexible spectrum allocation policies. LÄS MER

4. 3. Social Networks and the School-to-Work Transition

   Författare :Dagmar Müller; Oskar Nordström Skans; Anna Sjögren; Lena Hensvik; Albrecht Glitz; Uppsala universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; labor economics; social networks; social contacts; job search; job matching; young workers; school-to-work transition; youth labor market entry; Economics; Nationalekonomi;

   Sammanfattning : Essay I: This paper studies the importance of market work during high school for graduates' school-to-work transition and career. Relying on Swedish linked employer-employee data, I show that such work provides students with an important job-search channel that some graduates are deprived of due to establishment closures that occur just prior to graduation and labor market entry. LÄS MER

5. 4. Smart Cooperation with Network Coding in Hierarchical Wireless Networks

   Författare :Nan Li; Lars Kildehöj Rasmussen; Daniel Lucani; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Wireless communications; Hierarchical networks; 5G; Cognitive radio; Internet of Things; Cooperative communications; Spectrum sharing; Network coding; Optimization; Performance analysis.; Electrical Engineering; Elektro- och systemteknik;

   Sammanfattning : To achieve more dynamic, efficient and intelligent use of the scarce wireless spectrum resource, the concept of cooperation has been formalized into several hierarchical network models in future mobile networks. Cooperative communications, such as relaying, can potentially increase communication efficiency and spectrum utilization due to the broadcast nature of wireless networks, and may lead to a better support for diverse communication modes with flexible spectrum sharing. LÄS MER

7. 5. Low-Power Secondary Access to the TV and Aeronautical Bands

   Författare :Evanny Carol Obregon Gamarra; Jens Zander; Ki Won Sung; Ben Slimane; Jonas Kronander; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Secondary Access; Interference Management; TV band; Aeronautical Band; SRA - ICT; SRA - Informations- och kommunikationsteknik;

   Sammanfattning : The avalanche in mobile data consumption represents a big challenge for mobile operators. The efficient use of radio resources, e.g. technology, infrastructure and spectrum, is needed to meet the new capacity requirement in the mobile networks. LÄS MER