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Design And Simulation Of Fast Spectrum Sensing For Cognitive Radio Networks

Jouyaeian, Amir Hossein | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49922 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Fotowat Ahmadi, Ali
  7. Abstract:
  8. Deployment of demands, increase in users and new services highlight the necessity of effective frequency allocation i.e. dynamic allocation instead of fixed allocation. Cognitive radio is a proper solution for dynamic frequency allocation. Cognitive radio can scan the spectrum and use the idle bands for transmitting and receiving data. The main part of this radio which is responsible for the most pivotal task is spectrum sensing. Recently, varied methods have been proposed to sense the spectrum. The scope of this research is on designing a very high-speed spectrum sensing system. In this thesis, in order to meet the required scan rate, a tunable complex filter with 40MHz pass-band has been designed taking advantage of using a gm-C structure, which covers frequency range from 400MHz to 720MHz. After filtering, the system is followed by a circuit including switches and capacitors in order to compute Discrete Fourier Transform (DFT) in charge domain. The output conditions of the proposed DFT determine Idle and occupied bands under observation. The proposed system is designed and simulated in 180 nm CMOS technology while scanning the spectrum with 76.1MHz sweep rate and 5MHz resolution
  9. Keywords:
  10. Cognitive Radio ; Discrete Fourier Transform ; Complex Filter ; Spectrum Sensing ; Switched-Capacitor Circuits

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