Patents by Inventor Jae Hwui Bae

Jae Hwui Bae 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).

  • Patent number: 7742538
    Abstract: There are provided a method for selecting an optimal beam to improve digital broadcasting receiving performance, and a digital broadcasting receiving apparatus using the same. The method includes the steps of: a) calculating a mainpath Signal to Multipath signal and Noise Ratio (SMNR) based on a channel impulse response for a plurality of beams which are formed according to steering directions from output signals of antennas, wherein the output signal of each antenna has different phase shift according to location of antenna element; b) selecting a predetermined number of beams having a high SMNR value by comparing the calculated SMNR value for respective beam; c) calculating a mainpath Signal to Dominant Multipath signal Ratio (SDMR) based on a channel impulse response corresponding to the selected beam; and d) selecting a beam output signal having the biggest SDMR value by comparing SDMR values calculated in selecting a predetermined number of beams.
    Type: Grant
    Filed: November 25, 2005
    Date of Patent: June 22, 2010
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Ju-Yeun Kim, Young-Su Kim, Jae-Hwui Bae, Hyun Lee, Jong-Soo Lim, Soo-In Lee
  • Publication number: 20080291336
    Abstract: Provided are an apparatus and method for selecting an optimal signal using auxiliary equalization in a diversity receiver. The optimal signal selecting apparatus includes: a plurality of sync recovery units for extracting sync information from baseband signals, which are candidate signals, except a baseband signal selected as a current optimal signal a plurality of auxiliary equalizers for channel-equalizing the candidate signals based on the extracted sync information; a plurality of SNR measuring units for measuring signal-to-noise ratios (SNRs) of the candidate signals inputted to the auxiliary equalizers and the candidates signals equalized in the auxiliary equalizers; and an optimal signal selector for selecting an optimal candidate signal from the candidate signals by using the extracted sync information and the measured SNRs, and replacing the optimal signal with the optimal candidate signal when reception quality of the current optimal signal is poor.
    Type: Application
    Filed: November 7, 2006
    Publication date: November 27, 2008
    Inventors: Ju-Yeun Kim, Young-Su Kim, Jae-Hwui Bae, Hyun Lee, Jong-Soo Lim, Soo-In Lee
  • Publication number: 20080205537
    Abstract: There are provided a method for selecting an optimal beam to improve digital broadcasting receiving performance, and a digital broadcasting receiving apparatus using the same. The method includes the steps of: a) calculating a mainpath Signal to Multipath signal and Noise Ratio (SMNR) based on a channel impulse response for a plurality of beams which are formed according to steering directions from output signals of antennas, wherein the output signal of each antenna has different phase shift according to location of antenna element; b) selecting a predetermined number of beams having a high SMNR value by comparing the calculated SMNR value for respective beam; c) calculating a mainpath Signal to Dominant Multipath signal Ratio (SDMR) based on a channel impulse response corresponding to the selected beam; and d) selecting a beam output signal having the biggest SDMR value by comparing SDMR values calculated in selecting a predetermined number of beams.
    Type: Application
    Filed: November 25, 2005
    Publication date: August 28, 2008
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Ju-yeun Kim, Young-Su Kim, Jae-hwui Bae, Hyun Lee, Jong-soo Lim, Soo-In Lee
  • Publication number: 20080092194
    Abstract: Provided are a beam combining and hybrid beam selection method that can improve digital broadcasting reception performance by combining more than two beam output signals (beam combination type) instead of simply selecting one of beam output signals (beam selection type), or even selecting an optimal method between the beam selection type and the beam combination type, and a digital broadcasting receiving apparatus using the same.
    Type: Application
    Filed: July 4, 2005
    Publication date: April 17, 2008
    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Ju-Yeun Kim, Young-Su Kim, Jae-Hwui Bae, Hyun Lee, Jong-Soo Lim, Soo-In Lee
  • Patent number: 7315589
    Abstract: There is provided to an apparatus and method for selecting a beam having an optimal channel characteristic among multiple beams, which are formed at a digital TV receiver employing a switched beamforming part.
    Type: Grant
    Filed: December 31, 2003
    Date of Patent: January 1, 2008
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jae-Hwui Bae, Jae-Hyun Seo, Seung-Won Kim, Soo-In Lee
  • Patent number: 6946993
    Abstract: A receiver for improving reception ability of digital broadcasting service by switched beam-forming is disclosed. The receiver includes: an array antenna having a plurality of antenna elements for receiving signals of the digital broadcasting service; a demodulation unit for demodulating the receiving signals corresponding to each of antenna elements in the array antenna; beam-forming unit for generating a predetermined number of beam-forming signal by applying a beam-forming weights in order to direct to a predetermined direction according to the modulated signal from the modulation unit; and beam selection unit for selectively receiving signals of desired direction according to the beam forming signal. The present invention effectively eliminates multipath based on space filtering by utilizing beam-forming method with an array antenna for improving receiving performance of digital television broadcasting with VSB.
    Type: Grant
    Filed: July 31, 2003
    Date of Patent: September 20, 2005
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jae Hyun Seo, Jae Hwui Bae, Seung Won Kim, Chieteuk Ahn
  • Publication number: 20040252244
    Abstract: There is provided to an apparatus and method for selecting a beam having an optimal channel characteristic among multiple beams, which are formed at a digital TV receiver employing a switched beamforming part.
    Type: Application
    Filed: December 31, 2003
    Publication date: December 16, 2004
    Inventors: Jae-Hwui Bae, Jae-Hyun Seo, Seung-Won Kim, Soo-In Lee
  • Publication number: 20040061645
    Abstract: A receiver for improving reception ability of digital broadcasting service by switched beam-forming is disclosed. The receiver includes: an array antenna having a plurality of antenna elements for receiving signals of the digital broadcasting service; a demodulation unit for demodulating the receiving signals corresponding to each of antenna elements in the array antenna; beam-forming unit for generating a predetermined number of beam-forming signal by applying a beam-forming weights in order to direct to a predetermined direction according to the modulated signal from the modulation unit; and beam selection unit for selectively receiving signals of desired direction according to the beam forming signal. The present invention effectively eliminates multipath based on space filtering by utilizing beam-forming method with an array antenna for improving receiving performance of digital television broadcasting with VSB.
    Type: Application
    Filed: July 31, 2003
    Publication date: April 1, 2004
    Inventors: Jae Hyun Seo, Jae Hwui Bae, Seung Won Kim, Chieteuk Ahn
  • Publication number: 20030115540
    Abstract: A baseband encoding apparatus and frequency modulation method using the same in vestigial sideband (VSB) transmission system is disclosed. The apparatus includes a trellis encoder having a 1/2 code rate for generating a 2-bit output signal based on a 1-bit input signal and generating 4 types of signal levels in baseband by using the 2-bit output signal for converting the 4 types of the signal levels of the trellis encoder to symbols and generating 4 types of output symbols. The present invention can improve the receiving performance of the VSB transmission system in a mobile environment by implementing the trellis coded modulation having 1/2 code rate in the VSB broadcasting transmission system, which critically decreases minimum signal-to-noise ratio for recovering an original signal.
    Type: Application
    Filed: November 6, 2002
    Publication date: June 19, 2003
    Inventors: Jae-Hwui Bae, Jae-Hyun Seo, Seung Won Kim, Chieteuk Ahn