Patents by Inventor Keongkook Lee

Keongkook Lee 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).

  • Non-continuous orthogonal frequency division multiplexing system and control method of non-continuous orthogonal frequency division multiplexing system
    Patent number: 8325835
    Abstract: A Non-Continuous Orthogonal Frequency Division Multiplexing (NC-OFDM) system may be provided. The NC-OFDM system, including: a sensing unit to determine whether to use at least one frequency band; a band control unit to disable a subcarrier with respect to a frequency band in use as a result of the determination; a pruning determination unit to determine whether a number of points where the subcarrier is disabled is greater than a threshold value; a pruning retrieval unit to retrieve a pruning path generated by the disabling of the subcarrier, when the number of points is greater than the threshold value; and a Fourier transform unit to perform a Fast Fourier transform (FFT) or Inverse FFT (IFFT) by applying the pruning path to the subcarrier.
    Type: Grant
    Filed: June 15, 2010
    Date of Patent: December 4, 2012
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Deockgu Jee, Jin Up Kim, Joonhyuk Kang, Keongkook Lee, Jungho Myung
  • NON-CONTINUOUS ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING SYSTEM AND CONTROL METHOD OF NON-CONTINUOUS ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING SYSTEM
    Publication number: 20100316147
    Abstract: A Non-Continuous Orthogonal Frequency Division Multiplexing (NC-OFDM) system may be provided. The NC-OFDM system, including: a sensing unit to determine whether to use at least one frequency band; a band control unit to disable a subcarrier with respect to a frequency band in use as a result of the determination; a pruning determination unit to determine whether a number of points where the subcarrier is disabled is greater than a threshold value; a pruning retrieval unit to retrieve a pruning path generated by the disabling of the subcarrier, when the number of points is greater than the threshold value; and a Fourier transform unit to perform a Fast Fourier transform (FFT) or Inverse FFT (IFFT) by applying the pruning path to the subcarrier.
    Type: Application
    Filed: June 15, 2010
    Publication date: December 16, 2010
    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Deockgu Jee, Jin Up Kim, Joonhyuk Kang, Keongkook Lee, Jungho Myung