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Performance Analysis of DS/TH CDMA Cognitive Radio System under Doubly-Selective Fading Scenario

Naderi, Mohammad Saeed | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45275 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Mashhadi, Saeed
  7. Abstract:
  8. Nowadays providing services beyond the expected performance of users has become the most competition among telecommunication companies. Increase data rate at which a user is able to use a wireless system, you know that most of these companies are competing with each other. However, due to limited power to be sent to a transmitter, the first proposal to increase the data rate of wireless data transmission has a wider bandwidth. This results in increased bandwidth demand and thus sales by the government. During these years, many researchers have tried to increase efficiency in the use of broadband transceiver. These systems due to the wide band signal transmission and high-resolution mass spectrometer system gradually as a good candidate for multiple access spread spectrum communication capabilities were discussed. Hence, after years of attempts, UWB transmission is confirmed by FCC committee.In this thesis the performance of Rake receiver based on Time-Hopping spread spectrum systems for Doubly-Selective Channels are analyzed. For this purpose, the performance of the receiver DS/TH ARake (All-Rake) to detect a user's data was analyzed in the presence of other users in a Doubly-Selective channel. The analysis results in a tight band SNR and error probability are presented
  9. Keywords:
  10. Doppler Effect ; Time Hopping Technique ; Doubly Selective Fading ; Fading Channel ; Direct-Sequence/Time Hopping (DS/TH)

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