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Exploiting Bandpass Sampling and Compressed Sensing Alghorithms for RF to Digital Direct Conversion

Sobhani, Ghasem | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47687 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Tabandeh, Mahmoud; Pezeshk, Amir Mansour
  7. Abstract:
  8. The target of reconnaissance receivers is to detect radio frequencies and pulses present in the environment and extracting their characteristics. To receive the signals in the range of 2 to 18 GHz, different receptors can be used. Each receptor has its specific aplications, advantages and disadvantages. In this project, we proposed a receptor scheme with the following features: 1-simple hardware, 2-ability to detect simultaneous signals, 3-hundred percent probability of intercept (POI), 4-high input bandwidth and 5-rapid threat detection. To have such a receptor, we should move data processing parts of receptor to digital domain as much as possible, and reduce the amount of analog circuits, for direct conversion of RF to digital. In this project, we used bandpass sampling and compressed sensing alghorithms for above mentioned target. Our design uses bandpass sampling alghorithm to receive and sample input signal with much lower rate than the carrier frequency of the bandpass signal. Our scheme includes two bandpass sampling paths with different sampling rates. Input signal is sampled directly into digital (without any mixer to shift signals to baseband). Digitized signal obtained is processed in FPGA to extract its characteristics. Carrier frequency retrieval and other information detection methods, used in this project, are explained in this thesis. Also, the compressed sensing algorithm has been studied to be used in the proposed reconnaissance receiver. The proposed design has been simulated, implemented and tested practically and shown satisfactory results
  9. Keywords:
  10. Compressive Sensing ; Field Programmable Gate Array (FPGA) ; Bandpass Sampling ; Radio Ferequency to Digital Conversion ; Reconnaissance Receiver

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