Patents by Inventor Hyeong-Sook Park

Hyeong-Sook Park 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: 8054909
    Abstract: The present invention relates to a method of detecting a candidate vector and a method of detecting a transmission symbol using the same. According to an embodiment of the present invention, in a multiple input multiple output (MIMO) system using spatial multiplexing (SM), a receiver selects candidate vectors corresponding to a layer located at a last row among a plurality of rearranged layers, and sequentially ranks constellation dots of a next layer for each of the selected candidate vectors. Then, a plurality of arbitrary constellation dots are selected from the ranked constellation dots, accumulated costs of the arbitrary constellation dots are calculated, and a candidate vector is selected in correspondence with a constellation dot having a minimal accumulated cost.
    Type: Grant
    Filed: June 18, 2008
    Date of Patent: November 8, 2011
    Assignees: Samsung Electronics Co., Ltd, Electronics and Telecommunications Research Institute
    Inventors: Seung Jae Bahng, Jae Kwon Kim, Hoon Heo, Hyun Myung Wu, Youn-Ok Park, Young Jo Bang, Hyeong Sook Park, Hoon Lee, Young Ha Lee, Jung Pil Choi
  • Patent number: 8005182
    Abstract: The present invention relates to an apparatus and method of compensating for a frequency offset in an orthogonal frequency division multiple access system that is capable of efficiently estimating and compensating for the frequency offset. A receiver of the orthogonal frequency division multiple access system can individually estimate a fractional frequency offset and an integer frequency offset by using a downlink preamble signal. Further, the receiver can compensate for the frequency offset by adding the integer frequency offset once after completely compensating for the fractional frequency offset. Therefore, it is possible to efficiently compensate for the frequency offset.
    Type: Grant
    Filed: October 26, 2007
    Date of Patent: August 23, 2011
    Assignees: Electronics and Telecommunications Research Institute, Samsung Electronics Co., Ltd.
    Inventors: Hyeong-Sook Park, Jun-Woo Kim, Kyung-Yeol Sohn, Youn-Ok Park
  • Patent number: 7986757
    Abstract: The present invention relates to an apparatus and method of acquiring initial synchronization of a terminal in a mobile communication system. According to an exemplary embodiment of the present invention, one or more auto-correlation values of a preamble constituting a signal that is received from a base station are calculated. Averages of the calculated auto-correlation values according to samples are calculated, and then a peak value is detected among the calculated values. Then, a cell search is performed on the basis of the detected peak value, and a peak value from the result of the cell search is regularized. Then, the regularized peak value is compared with a predetermined reference value such that it is checked whether synchronization of a signal that has been searched is accurate or not.
    Type: Grant
    Filed: October 24, 2007
    Date of Patent: July 26, 2011
    Assignees: Samsung Electronics Co., LLP, Electronics and Telecommunications Research Institute
    Inventors: Hyeong-Sook Park, Jun-Woo Kim, Kyung-Yeol Sohn, Youn-Ok Park
  • Patent number: 7970363
    Abstract: A terminal of a communication system includes a power amplifier, an open-loop power controller, a gain controller, a modulator, and a digital/analog converter. The power amplifier amplifies transmission power of a transmission signal. The open-loop power controller measures a received signal strength to control the transmission power, and increases a gain of the power amplifier according to the received signal strength. The gain controller sets a power concentration gain and applies the power concentration gain to the transmission signal when the gain of the power amplifier is maximized. The modulator modulates the transmission signal. The digital/analog converter converts an input signal to an analog signal. The gain controller applies the power concentration gain to the trans mission signal modulated by the modulator, and transmits the power concentration gain to the digital/analog converter.
    Type: Grant
    Filed: December 8, 2006
    Date of Patent: June 28, 2011
    Assignees: Samsung Electronics Co., Ltd., Electronics and Telecommunications, SK TELECOM Co., Ltd., KT Corporation, HANARO TELECOM, Inc.
    Inventors: Dae-Ho Kim, Jun-Woo Kim, Kyung-Yeol Sohn, Hyeong-Sook Park, Youn-Ok Park
  • Publication number: 20110103521
    Abstract: Disclosed is a method and apparatus for composing a received symbol signal modulated with a bit reflected Gray code into bit information. According to an embodiment of the present invention, a positive integer of the received symbol signal having bits is assigned according to the Gray mapping rule, and a sign is determined. A value that is indicative of an arrangement of the bits constituting the received symbol signal is calculated. A boundary value in at least one bit group consisting of the bits constituting the received symbol signal is acquired, and a difference from an absolute value of the received symbol signal is calculated. The received symbol signal is converted into information per bit using a value of the received symbol signal based on the positive integer and the determined sign, the value that is indicative of the bit arrangement, and the difference from the absolute value.
    Type: Application
    Filed: September 1, 2008
    Publication date: May 5, 2011
    Inventors: Chang Wahn YU, Dong Weon Yoon, Kwang Min Hyun, Youn Ok Park, Dae Ho Kim, Jun-Woo Kim, Hyeong Sook Park, Seung Jae Bahng, Young Jo Bang, Kyung Yeol Sohn
  • Patent number: 7929621
    Abstract: A terminal demodulation apparatus previously stores a received frame signal in a memory before inputting the same into a fast Fourier transform (FFT) unit, performs a demodulation to necessary information read from the corresponding memory, and has a separate data subcarrier memory and pilot subcarrier memory, and uses the signal demodulation method mixed with a subcarrier allocation method so as to easily demodulate various subcarrier allocation methods.
    Type: Grant
    Filed: December 11, 2006
    Date of Patent: April 19, 2011
    Assignees: Samsung Electronics Co., Ltd., Electronics and Telecommunications Research Institute, KT Corporation, SK Telecom Co., Ltd., Hanaro Telecom, Inc.
    Inventors: Jun-Woo Kim, Jae-Gun Jung, Dae-Ho Kim, Hyeong-Sook Park, Youn-Ok Park
  • Patent number: 7904044
    Abstract: The present invention relates to an automatic gain control apparatus and method in a mobile communication system. According to the automatic gain control apparatus of an embodiment of the invention, when downlink signals include both directional beam signals and beam signals traveling in all directions due to the antenna system, different reception gain reference values are used according to whether downlink signals including only the beam signals traveling in all directions are received or downlink signals including the directional beam signals are received, thereby controlling the gain of the received signal. When the downlink signals including the directional beam signals are received, the automatic gain control apparatus can appropriately control the gain of the received signal on the basis of the directional beam signals to prevent saturation of the received signal.
    Type: Grant
    Filed: October 26, 2007
    Date of Patent: March 8, 2011
    Assignees: Electronics and Telecommunications Research Institute, Samsung Electronics Co., Ltd.
    Inventors: Jun-Woo Kim, Hyeong-Sook Park, Youn-Ok Park
  • Patent number: 7813435
    Abstract: The present invention relates to a method for allocating subcarriers in an orthogonal frequency division multiplex (OFDM) system, and a transmitter thereof. In the OFDM system according to an exemplary embodiment of the present invention, the subcarrier allocation is performed in the buffer (10) before a modulation mapping operation is performed according to a modulation method such that the delay may not be generated in the subchannel formed on the symbol axis. The delay corresponding to the symbols is prevented without using any additional hardware for eliminating the delay generated when the subcarriers are allocated to the subchannel formed on the symbol axis.
    Type: Grant
    Filed: May 11, 2005
    Date of Patent: October 12, 2010
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Hyeong-Sook Park, Youn-Ok Park
  • Publication number: 20100135438
    Abstract: Disclosed is a method of detecting signals at a receiver of a communication system with a multiple input multiple output antenna. With the signal detection method, a square of the distance between a received signal vector and a channel status-considered transmission symbol vector is calculated first, and the square of the distance is then classified into first and second components. The first component is minimized to calculate a plurality of first soft symbol estimates. A solution set of the first component is calculated on the basis of the plurality of first soft symbol estimates. The second component is minimized to calculate a plurality of second soft symbol estimates. A solution set of the second component is calculated on the basis of the plurality of second soft symbol estimates. A final solution set is calculated by doing the sum of the first component solution set and the second component solution.
    Type: Application
    Filed: November 30, 2009
    Publication date: June 3, 2010
    Applicants: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE, Samsung Electronics Co., Ltd.
    Inventors: Young Jo BANG, Hyeong Sook PARK, Jun-Woo KIM, Kyung Yeol SOHN, Chang Wahn YU, Youn Ok PARK, Jee Hwan AHN, Il Min KIM
  • Publication number: 20100046662
    Abstract: The present invention relates to a digital clipping method for reducing a high peak-to-average power ratio (PAPR) of a transmission signal in a transmitter of an orthogonal frequency division multiplexing access (OFDMA) system. In the method, a) the transmission signal to be digitally clipped is divided into real and imaginary parts, b) magnitudes of the real and imaginary part signals are divided into a plurality clipping levels, and c) the transmission signal is respectively clipped by comparing the real and imaginary part signals with the plurality of clipping levels while allowing phase errors. In c), a plurality of comparators is used to respectively compare the real and imaginary parts of the complex number transmission signal with the plurality of clipping levels.
    Type: Application
    Filed: October 26, 2005
    Publication date: February 25, 2010
    Applicants: Electronics and Telecommunications Research Institute, SAMSUNG ELECTRONICS CO., KT Corporation, SK Telecom Co., Ltd., KTFREETEL CO., LTD., HANARO TELECOM, INC.
    Inventors: Hyeong-Sook Park, Youn-Ok Park
  • Patent number: 7646749
    Abstract: A downlink beamforming apparatus and a transmission apparatus including the same includes a subcarrier based user identifier for dividing subcarriers according to users, a beamforming weight buffer for storing first beamforming weights for the subcarriers by each of transmitting antennas, an interpolator for outputting second beamforming weights for each transmitting antenna by interpolating the first beamforming weights, and a signal reproducer for reproducing the signal for each transmitting antenna. Subcarriers are allocated to the signal by each user; and a complex multiplier multiplies the signal for each transmitting antenna by the second beamforming weights.
    Type: Grant
    Filed: December 11, 2006
    Date of Patent: January 12, 2010
    Assignees: Samsung Electronics Co., Ltd., Electronics & Telecommunications Research Institute, KT Corporation, SK Telecom Co., Ltd., Hanaro Telecom., Inc.
    Inventors: Hyeong-Sook Park, Kyung-Yeol Sohn, Dae-Ho Kim, Jun-Woo Kim, Youn-Ok Park
  • Publication number: 20090141786
    Abstract: The present invention relates an apparatus and method of estimating a signal-to-noise ratio (SNR) of a received signal when the received signal has a timing offset. An apparatus for estimating a signal-to-noise ratio (SNR) according to an exemplary embodiment of the present invention includes a fast Fourier transform (FFT) unit that performs a fast Fourier transform on a received signal to convert the received signal into a frequency domain signal; a preamble selector that extracts a preamble from the frequency domain signal; a correlator that correlates the preamble to a preamble reference signal generated by a receiver to calculate a correlation value; an entire power estimator that calculates entire power; a noise power estimator that applies a differential demodulation method to the correlation value to remove a timing offset and calculate noise power; and an estimating unit that uses the entire power and the noise power to estimate the signal-to-noise ratio (SNR).
    Type: Application
    Filed: July 22, 2008
    Publication date: June 4, 2009
    Applicants: Electronics and Telecommunications Research Institute, Samsung Electronics Co., LTD.
    Inventors: Hyeong Sook PARK, Jun-Woo KIM, Eon Young HONG, Youn Ok PARK
  • Publication number: 20090135947
    Abstract: The present invention relates to a method of detecting a candidate vector and a method of detecting a transmission symbol using the same. According to an embodiment of the present invention, in a multiple input multiple output (MIMO) system using spatial multiplexing (SM), a receiver selects candidate vectors corresponding to a layer located at a last row among a plurality of rearranged layers, and sequentially ranks constellation dots of a next layer for each of the selected candidate vectors. Then, a plurality of arbitrary constellation dots are selected from the ranked constellation dots, accumulated costs of the arbitrary constellation dots are calculated, and a candidate vector is selected in correspondence with a constellation dot having a minimal accumulated cost.
    Type: Application
    Filed: June 18, 2008
    Publication date: May 28, 2009
    Applicants: Electronics and Telecommunications Research Institute, Samsung Electronics Co., LTD.
    Inventors: Seung Jae BAHNG, Jae Kwon KIM, Hoon HEO, Hyun Myung WU, Youn Ok PARK, Young Jo BANG, Hyeong Sook PARK, Hoon LEE, Young Ha LEE, Jung Pil CHOI
  • Publication number: 20080287078
    Abstract: A terminal of a communication system includes a power amplifier, an open-loop power controller, a gain controller, a modulator, and a digital/analog converter. The power amplifier amplifies transmission power of a transmission signal. The open-loop power controller measures a received signal strength to control the transmission power, and increases a gain of the power amplifier according to the received signal strength. The gain controller sets a power concentration gain and applies the power concentration gain to the transmission signal when the gain of the power amplifier is maximized. The modulator modulates the transmission signal. The digital/analog converter converts an input signal to an analog signal. The gain controller applies the power concentration gain to the trans mission signal modulated by the modulator, and transmits the power concentration gain to the digital/analog converter.
    Type: Application
    Filed: December 8, 2006
    Publication date: November 20, 2008
    Applicants: SAMSUNG ELECTRONICS CO. LTD., SK TELECOM CO., LTD, KT CORPORATION, HANARO TELECOM, INC., Electronics and Telecommunications Research Instit
    Inventors: Dae-Ho Kim, Jun-Woo Kim, Kyung-Yeol Sohn, Hyeong-Sook Park, Youn-Ok Park
  • Publication number: 20080205532
    Abstract: The present invention relates to a method for allocating subcarriers in an orthogonal frequency division multiplex (OFDM) system, and a transmitter thereof. In the OFDM system according to an exemplary embodiment of the present invention, the subcarrier allocation is performed in the buffer (10) before a modulation mapping operation is performed according to a modulation method such that the delay may not be generated in the subchannel formed on the symbol axis. The delay corresponding to the symbols is prevented without using any additional hardware for eliminating the delay generated when the subcarriers are allocated to the subchannel formed on the symbol axis.
    Type: Application
    Filed: May 11, 2005
    Publication date: August 28, 2008
    Inventors: Hyeong-Sook Park, Youn-Ok Park
  • Publication number: 20080144756
    Abstract: The present invention relates to an apparatus and method of acquiring initial synchronization of a terminal in a mobile communication system. According to an exemplary embodiment of the present invention, one or more auto-correlation values of a preamble constituting a signal that is received from a base station are calculated. Averages of the calculated auto-correlation values according to samples are calculated, and then a peak value is detected among the calculated values. Then, a cell search is performed on the basis of the detected peak value, and a peak value from the result of the cell search is regularized. Then, the regularized peak value is compared with a predetermined reference value such that it is checked whether synchronization of a signal that has been searched is accurate or not.
    Type: Application
    Filed: October 24, 2007
    Publication date: June 19, 2008
    Applicants: Electronics and Telecommunications Research Institute, Samsung Electronics Co., LTD.
    Inventors: Hyeong-Sook PARK, Jun-Woo KIM, Kyung-Yeol SOHN, Youn-Ok PARK
  • Publication number: 20080137768
    Abstract: The present invention relates to an apparatus and method of compensating for a frequency offset in an orthogonal frequency division multiple access system that is capable of efficiently estimating and compensating for the frequency offset. A receiver of the orthogonal frequency division multiple access system can individually estimate a fractional frequency offset and an integer frequency offset by using a downlink preamble signal. Further, the receiver can compensate for the frequency offset by adding the integer frequency offset once after completely compensating for the fractional frequency offset. Therefore, it is possible to efficiently compensate for the frequency offset.
    Type: Application
    Filed: October 26, 2007
    Publication date: June 12, 2008
    Applicants: Electronics and Telecommunications Research Institute, Samsung Electronics Co., LTD.
    Inventors: Hyeong-Sook PARK, Jun-Woo KIM, Kyung-Yeol SOHN, Youn-Ok PARK
  • Publication number: 20080119152
    Abstract: The present invention relates to an automatic gain control apparatus and method in a mobile communication system. According to the automatic gain control apparatus of an embodiment of the invention, when downlink signals include both directional beam signals and beam signals traveling in all directions due to the antenna system, different reception gain reference values are used according to whether downlink signals including only the beam signals traveling in all directions are received or downlink signals including the directional beam signals are received, thereby controlling the gain of the received signal. When the downlink signals including the directional beam signals are received, the automatic gain control apparatus can appropriately control the gain of the received signal on the basis of the directional beam signals to prevent saturation of the received signal.
    Type: Application
    Filed: October 26, 2007
    Publication date: May 22, 2008
    Applicants: Electronics and Telecommunications Research Institute, Samsung Electronics Co., LTD.
    Inventors: Jun-Woo KIM, Hyeong-Sook PARK, Youn-Ok PARK
  • Publication number: 20070133703
    Abstract: A terminal demodulation apparatus previously stores a received frame signal in a memory before inputting the same into a fast Fourier transform (FFT) unit, performs a demodulation to necessary information read from the corresponding memory, and has a separate data subcarrier memory and pilot subcarrier memory, and uses the signal demodulation method mixed with a subcarrier allocation method so as to easily demodulate various subcarrier allocation methods.
    Type: Application
    Filed: December 11, 2006
    Publication date: June 14, 2007
    Applicants: SAMSUNG ELECTRONICS CO., LTD., Electronics and Telecommunications Research Institute, KT Corporation, SK TELECOM CO., LTD., HANARO TELECOM., INC.
    Inventors: Jun-Woo Kim, Jae-Gun Jung, Dae-Ho Kim, Hyeong-Sook Park, Youn-Ok Park
  • Publication number: 20070133460
    Abstract: Disclosed herein is a base station that extracts a ranging channel signal from a received signal partially correlates each of a plurality of ranging channel signals and each of ranging codes according to ranging modes, and selects a ranging channel signal greater than a first threshold value, the plurality of ranging channel signals being signals according to plurality of time delays of a ranging channel signal. In addition, the base station correlates each of the selected ranging channel signal and each of corresponding ranging code, selects a ranging channel signal having the maximum correlation value, and estimates receiving power by using a time delay corresponding to the selected ranging channel signal.
    Type: Application
    Filed: December 11, 2006
    Publication date: June 14, 2007
    Applicants: SAMSUNG ELECTRONICS CO., LTD, Electronics and Telecommunications Research Institute, KT Corporation, SK TELECOM CO., LTD, HANARO TELECOM., INC.
    Inventors: Kyung-Yeol Sohn, Hyeong-Sook Park, Youn-Ok Park