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Investigation and Implementation of Ultra High Speed Algorithms for Frequency Measurement

Mahmoodi, Mohsen | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46137 (08)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Pezeshk, Amirmansour; Sanaei, Esmaeel
  7. Abstract:
  8. The purpose of this project is to detect the instantaneous frequency of an unknown signal which has a frequency range from 2GHz to 18GHz, and its amplitude is limited. In the first step, this signal is amplified, and its amplitude is limited and then it is converted to a digital sequence using a mono-bit scheme and entered the FPGA through an ultra-fast serial port. After that, the algorithm of this project is supposed to do two main processing stages on the received stream of pulses. Detection should be performed in the first phase. It means that it should be determined whether the received pulse sequence is a random sequence made by noise or an almost regular sequence due to a sinusoidal signal. In the other stage, after detection, the frequency of the detected signal must be extracted with high precision. In order to detection, identification, and measurement of the frequency, four methods are compared in this project. The first two methods are conventional methods, and we will simulate both of them completely to compare their results to the new methods. The performance of the third method, which is a new method,will be studied and simulated thenwe will compare them with the previous approachesaccording to our simulation results.The lastmethod, that is now one of the common methods of frequency detection,will be evaluated and optimized with new ideas, so it will become appropriate to detect the frequency of high frequency signals with low SNRs. We will simulate this method with the applied optimization approaches and demonstrate that the last method is the best one to reach the main goal which is detecting the frequency with high precision
  9. Keywords:
  10. Signal Detection ; Instantaneous Frequency Measurment ; Frequency Measurement with High Precision ; Slow Signal to Noise Ratio

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