Patents by Inventor Hee-Jin Yoo

Hee-Jin Yoo 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 and method for detecting I/Q channel imbalance in direct conversion digital quadrature transmission system
    Patent number: 7209526
    Abstract: An apparatus and a method for detecting imbalances between an I-channel signal and a Q-channel signal in order to suppress a spurious signal in a direct conversion digital quadrature transmission system is disclosed. The apparatus includes: a compensation signal generating unit for generating a first and a second compensation signals based on a digital I-channel and a digital Q-channel signals; a baseband signal generating unit for generating an I-channel and a Q-channel baseband signals by converting a radio frequency signal into a low frequency signal; and a detecting unit for detecting a phase imbalance and an amplitude imbalance between the digital I-channel and the digital Q-channel signals by using a correlation between the first and the second compensation signals with the I-channel and the Q-channel baseband signals.
    Type: Grant
    Filed: July 12, 2004
    Date of Patent: April 24, 2007
    Assignees: Electronics and Telecommunications Research Institute, Hanbat National University Industry-Academic Cooperation Foundation
    Inventors: Young-Wan Kim, Chang-Seok Lee, Yu-Shin Kim, Hee-Jin Yoo, Eun-Suk Kwak
  • Apparatus and method for detecting I/Q channel imbalance in direct conversion digital quadrature transmission system
    Publication number: 20050123067
    Abstract: An apparatus and a method for detecting imbalances between an I-channel signal and a Q-channel signal in order to suppress a spurious signal in a direct conversion digital quadrature transmission system is disclosed. The apparatus includes: a compensation signal generating unit for generating a first and a second compensation signals based on a digital I-channel and a digital Q-channel signals; a baseband signal generating unit for generating an I-channel and a Q-channel baseband signals by converting a radio frequency signal into a low frequency signal; and a detecting unit for detecting a phase imbalance and an amplitude imbalance between the digital I-channel and the digital Q-channel signals by using a correlation between the first and the second compensation signals with the I-channel and the Q-channel baseband signals.
    Type: Application
    Filed: July 12, 2004
    Publication date: June 9, 2005
    Inventors: Young-Wan Kim, Chang-Seok Lee, Yu-Shin Kim, Hee-Jin Yoo, Eun-Suk Kwak