Patents by Inventor Ruixun Liu

Ruixun Liu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Blind spectrum sensing method and device based on fast fourier transform
    Patent number: 9590828
    Abstract: A blind spectrum sensing method and device based on fast Fourier transform. The method comprises: the spectrum sensing device receives a signal on an authorized spectrum band, calculates an autocorrelation coefficient of the received signal after sampling and filtering same, then performs a fast Fourier transform of the autocorrelation coefficient, acquires the modulus of the transform result, constructs determination variables on the basis of the modulus, and determine whether or not a signal of an authorized user is present. The method and device have the advantages of low calculation complexity, obviated need for authorization information characteristic, and insensitivity towards noise uncertainty, and are of great performance.
    Type: Grant
    Filed: June 20, 2013
    Date of Patent: March 7, 2017
    Assignee: Southeast University
    Inventors: Dongming Wang, Yufei Wu, Ruixun Liu, Xiangyang Wang, Wenrui Tang, Yuqi Huang
  • BLIND SPECTRUM SENSING METHOD AND DEVICE BASED ON FAST FOURIER TRANSFORM
    Publication number: 20160197748
    Abstract: A blind spectrum sensing method and device based on fast Fourier transform. The method comprises: the spectrum sensing device receives a signal on an authorized spectrum band, calculates an autocorrelation coefficient of the received signal after sampling and filtering same, then performs a fast Fourier transform of the autocorrelation coefficient, acquires the modulus of the transform result, constructs determination variables on the basis of the modulus, and determine whether or not a signal of an authorized user is present. The method and device have the advantages of low calculation complexity, obviated need for authorization information characteristic, and insensitivity towards noise uncertainty, and are of great performance.
    Type: Application
    Filed: June 20, 2013
    Publication date: July 7, 2016
    Inventors: Dongming Wang, Yufei Wu, Ruixun Liu, Xiangyang Wang, Wenrui Tang, Yuqi Huang