Loading...

Analysis and Enhancement of Information Transmission in a Cognitive Radio Device-to-Device Network with Full-Duplex Communication Capability

Yousefi, Mohammad | 2016

546 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49249 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Ashtiani, Farid; Mirmohseni, Mahtab
  7. Abstract:
  8. Increasing demand of bandwidth in wireless communications systems led to excessive congestion in frequency spectrum. Since radio spectrum is an expensive and rare source, its efcient use is an important challenge. These limitations as well as increasing number of communications service users,necessitate the use of newer technologies that work efciently with numerous users. Device-to-Device (D2D) communications, full-duplex capability and cognitive radio systems are introduced for this reason. In the previous technologies, due to excessive self-interference (SI), full-duplex transmission has not been implemented. However nowadays technology allows self-interference to be attenuated up to 100 dB.In this thesis we investigate full-duplex cognitive radio device-to-device communications and show that tolerating some costs like more packet delay, full-duplex transmission can increase the spectrum efciency. Our analysis method is based on Markov Decision Processes modeling that gives optimal policy among available actions.In our scenario, the D2D pair must choose one action among the no-transmission, half-duplex and full-duplex actions. On the other hand this pair reuses the primary network resources opportunistically, so it makes interference in the primary base station. This interference must be less than a certain threshold, so the transmission among the primary users won’t experience an outage. Because in full-duplex transmissions two packets are sent in one time slot and one frequency, we consider higher reward for this action. Finally, we conclude that full-duplex transmission is more efcient than half-duplex transmission, considering the channel occupancy ratio as the metric
  9. Keywords:
  10. Cognitive Radio ; Device to Device Communications ; Full Coupling ; Markov Decision Making ; Optimal Policy ; Self Interterence

 Digital Object List

 Bookmark

No TOC