Title：Frequency modulation signal demodulation system for detecting narrowband interference or channel change
Country：China
Patent No.：201810368445.3
Legal Status：Under review
Inventor：Woogeun Rhee, Yining Zhang, Ranran Zhou, Zhihua Wang
Assignee：Tsinghua University
Address：Tsinghua University,Haidian District Beijing 100084, China
Filing Date：2018-04-23
Issue Date：
Abstract：
The invention discloses a frequency modulation signal demodulation system for detecting narrowband interference or channel change. The system comprises a signal conversion module which is used for carrying out analog-to-digital conversion to obtain a digital signal; a signal conversion module for carrying out Fourier transform on the digital signal, outputting a transform result and removing unrelated frequency points to obtain bit information; a collection storage module which is used for storing the preset number of pieces of bit information; a classification and check module which is used for periodically carrying out retiming, classification and confidence degree judgment on the preset number of pieces of bit information, and calculating modulation templates which receive symbols of the signal according to a statistical rule; and a signal demodulation module which is used for carrying out matching filtering through utilization of the calculated modulation templates, and demodulating and shaping the signal to obtain a frequency modulation signal demodulation result. According to the system, a conventional frequency shift keying signal is demodulated, an adaptive filter parameterand a channel characteristic parameter also can be provided based on the statistical characteristic of the signal, and the narrowband interference is dynamically detected.
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