Patents by Inventor Chonghan Song

Chonghan Song 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).

  • Apparatus for estimating frequency offset in OFDM system
    Patent number: 8428200
    Abstract: Provided is an apparatus for estimating a frequency offset by one training symbol including two symbols having the same structure and value in an OFDM system. The apparatus includes a first likelihood function calculator for modeling non-Gaussian impulsive noise included in the training symbol to a Cauchy probability density function in which a characteristic exponent of a BIS?S probability density function is 1, and calculating a likelihood function of a Cauchy distribution using the Cauchy probability density function, and a first frequency offset estimator for estimating an effective frequency offset value in which the likelihood function of the Cauchy distribution of the first likelihood function calculator becomes highest as a frequency offset estimation value. Thereby, it is possible to improve the performance of frequency offset estimation in non-Gaussian impulsive noise environments.
    Type: Grant
    Filed: September 29, 2010
    Date of Patent: April 23, 2013
    Assignee: Sungkyunkwan University Foundation for Corporate Collaboration
    Inventors: Chonghan Song, Junhwan Kim, Youngpo Lee, Seung Goo Kang, Seokho Yoon
  • Apparatus for Estimating Frequency Offset in OFDM System
    Publication number: 20110274219
    Abstract: Provided is an apparatus for estimating a frequency offset by one training symbol including two symbols having the same structure and value in an OFDM system. The apparatus includes a first likelihood function calculator for modeling non-Gaussian impulsive noise included in the training symbol to a Cauchy probability density function in which a characteristic exponent of a BIS?S probability density function is 1, and calculating a likelihood function of a Cauchy distribution using the Cauchy probability density function, and a first frequency offset estimator for estimating an effective frequency offset value in which the likelihood function of the Cauchy distribution of the first likelihood function calculator becomes highest as a frequency offset estimation value. Thereby, it is possible to improve the performance of frequency offset estimation in non-Gaussian impulsive noise environments.
    Type: Application
    Filed: September 29, 2010
    Publication date: November 10, 2011
    Applicant: Sungkyunkwan University Foundation for Corporate Collaboration
    Inventors: Chonghan Song, Junhwan Kim, Youngpo Lee, Seung Goo Kang, Seokhe Yoon