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Analysis of OFDM-based Cognitive Radio System with Multiuser Detection in Doubly-selective Fading Scenario

Tavakkolnia, Iman | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44688 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Mashhadi, Saeed
  7. Abstract:
  8. Today, with the expanding usage of wireless communication systems, the need for system which uses the spectrum efficiently is inevitable. Therefore, Cognitive Radio structures have be the center of attention, recently. In cognitive radio structures, the system tries to use the empty spectrum efficientlyin time, frequency, and space domain. Autonomous Vehicular Networks are interesting application, in which cognitive radio can be used. In such networks, due to high speed, the channel state changes drastically which negatively affects the system.Hence, in this thesis, an OFDM-based multiuser structure is designed which work properly in such condition. For designing the structure, a doubly selective fading scenario is assumed that expresses the channel state in high speed condition. Improving the structure to a non-continuous OSDM, and using Carrier Interferometry codes help to achieve better performance. We will derive an approximate formula for error probability which shows the behavior of the structure is different conditions. Also, simulation results demonstrate the good performance of the structure
  9. Keywords:
  10. Multiuser Receiver ; Cognitive Radio ; Orthogonal Frequency Division Multiplexing (OFDM) ; Doubly Selective Fading ; Orthogonal Signal Division Multiplexing (OSDM) ; Carriers Interferometry Codes

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