Patents by Inventor Chi-Woo Lim

Chi-Woo Lim 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).

  • Device and method for performing device to device communication in wireless communication system
    Patent number: 9357526
    Abstract: A device and a method for performing Device to Device (D2D) communication in a wireless communication system are provided. The method includes transmitting information on a self-frequency band selected from all frequency bands for the D2D communication, to the second mobile station, receiving information on a counterpart-frequency band selected for the D2D communication, from the second mobile station, determining transmission and reception frequency bands to be used for the D2D communication, based on the information on the self-frequency band and the information on the counterpart-frequency band, transmitting data to the second mobile station in the determined transmission frequency band, and receiving data from the second mobile station in the determined reception frequency band.
    Type: Grant
    Filed: April 16, 2014
    Date of Patent: May 31, 2016
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sang-Kyu Baek, Young-Bin Chang, Kyung-Kyu Kim, Hyun-Seok Ryu, Seung-Hoon Park, Chi-Woo Lim
  • Method and apparatus for performing synchronization in device-to-device network
    Patent number: 9332513
    Abstract: A method and an apparatus for performing synchronization by a first device in a Device-to-Device (D2D) network are provided. The method includes detecting a synchronization signal from at least one second device during one period, determining a phase adjustment value depending on a number of synchronization signals, which have been detected from the at least one second device during the one period, adjusting a phase value of a first device using the phase adjustment value, and transmitting a synchronization signal if the phase value of the first device reaches a predetermined specific value.
    Type: Grant
    Filed: May 16, 2013
    Date of Patent: May 3, 2016
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Seung-Hoon Park, Kyung-Kyu Kim, Dae-Gyun Kim, Chi-Woo Lim
  • Method and apparatus for encoding and decoding for frequency and quadrature-amplitude modulation in wireless communication system
    Patent number: 9331884
    Abstract: An apparatus and a method for operating a transmission end in a wireless communication system that supports Frequency and Quadrature-Amplitude Modulation (FQAM) are provided. The method includes dividing an information bit stream into a plurality of portions, encoding each of the plurality of portions using different encoding schemes, and generating an FQAM symbol by combining result values of the encoding of each of the plurality of portions, wherein the encoding schemes are different according to at least one of an encoding order, an encoding rate, an input size, and an encoding technique.
    Type: Grant
    Filed: March 11, 2014
    Date of Patent: May 3, 2016
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sung-Nam Hong, Min Sagong, Chi-Woo Lim, Hyun-Kyu Yu, Kyung-Whoon Cheun
  • Method and device for performing beam tracking through short range object detection
    Patent number: 9306648
    Abstract: A method of a terminal that forms beams and a device for performing beam tracking in a communication system that supports beamforming are provided. The method includes detecting, by the terminal, an object located at a periphery of the terminal and performing beam tracking through beams formed by the terminal, except for a beam that is formed in a direction in which the detected object is located.
    Type: Grant
    Filed: January 5, 2015
    Date of Patent: April 5, 2016
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Min Sagong, Chi-Woo Lim, Su-Ryong Jeong, Sung-Nam Hong
  • Method and apparatus for synchronization for device-to-device communication
    Patent number: 9301270
    Abstract: A method and an apparatus for synchronization for a device-to-device communication are disclosed. The method includes: instantly adjusting a synchronization phase value according to a time point when a synchronization signal is received, as soon as a device receives the synchronization signal from an adjacent device in an unconnected state; accumulatively storing at least one phase adjustment value according to a time point when at least one synchronization signal is received, whenever the device receives the at least one synchronization signal from at least one adjacent device in a connected state; and adjusting the synchronization phase value according to the stored at least one phase adjustment value when the device transitions from the connected state to the unconnected state.
    Type: Grant
    Filed: October 23, 2013
    Date of Patent: March 29, 2016
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Seung-Hoon Park, Kyung-Kyu Kim, Dae-Gyun Kim, Chi-Woo Lim
  • Apparatus and method for generating synchronization channel in a wireless communication system
    Patent number: 9277516
    Abstract: A Synchronization Channel (SCH) transmission method includes generating a Primary SCH (P-SCH) sequence according to supplementary information. The supplementary information includes at least one of Base Station (BS) type information, Fast Fourier Transform (FFT) size information, BandWidth (BW) information, group information, sector information, and carrier type information. The method also includes modulating the P-SCH sequence and mapping the modulated P-SCH sequence to subcarriers within a predefined subcarrier set. The subcarriers are included in the subcarrier set being spaced one subcarrier interval apart. The method further includes generating a P-SCH symbol by Orthogonal Frequency Division Multiplexing (OFDM)-modulating the P-SCH sequence mapped to the subcarriers, and transmitting the P-SCH symbol.
    Type: Grant
    Filed: September 30, 2013
    Date of Patent: March 1, 2016
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Sung-Eun Park, Jae-Weon Cho, Seung-Hoon Choi, Chi-Woo Lim, Song-Nam Hong
  • METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING DATA IN WIRELESS COMMUNICATION SYSTEM SUPPORTING NON-BINARY CHANNEL CODE
    Publication number: 20160036609
    Abstract: The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates beyond 4th-Generation (4G) communication system such as a Long Term Evolution (LTE). A method for transmitting data in a transmitting apparatus in a wireless communication system supporting a non-binary channel code is provided. The method includes generating at least one modulation symbol by modulating at least one code symbol based on a predetermined modulation scheme; and transmitting the at least one modulation symbol to a receiving apparatus, wherein the generating of the at least one modulation symbol comprises generating the at least one modulation symbol from the at least one code symbol to thereby reduce a number of complex modulation symbols generated from a plurality of code symbols.
    Type: Application
    Filed: July 31, 2015
    Publication date: February 4, 2016
    Inventors: Seok-Ki Ahn, Woo-Myoung Park, Min Sagong, Chi-Woo Lim, Sung-Nam Hong
  • METHOD AND APPARATUS FOR CONTROLLING TRANSMISSION POWER OF DEVICE-TO-DEVICE COMMUNICATION NETWORK
    Publication number: 20150373651
    Abstract: The present invention is to provide a method and device for controlling transmission power by taking comprehensive consideration not only of the effect received onto itself in each device-to-device (D2D) link of a D2D communication network but also of the effect exerted onto the neighboring links.
    Type: Application
    Filed: February 7, 2014
    Publication date: December 24, 2015
    Inventors: Hyun-Seok RYU, Min-Young CHUNG, Dong-Hyun KIM, Sueng-Jae BAE, Kyung-Kyu KIM, Dae-Gyun KIM, Seung-Hoon PARK, Chi-Woo LIM
  • METHOD AND APPARATUS FOR MEASURING LINK QUALITY IN WIRELESS COMMUNICATION SYSTEM SUPPORTING DEVICE-TO-DEVICE COMMUNICATION
    Publication number: 20150365992
    Abstract: The present disclosure relates to a device-to-device (D2D) communication for direct communication between nodes in a wireless communication system, wherein an operation method of a terminal includes the steps of: generating sequences, which belong to an orthogonal sequence set, according to a sequence pattern corresponding to a priority of a link; and transmitting the sequences, as signals for measurement of a reception electric power of a counterpart terminal, through sub-blocks within a channel, wherein one sequence is transmitted through each of the sub-blocks.
    Type: Application
    Filed: January 16, 2014
    Publication date: December 17, 2015
    Inventors: Chi-Woo Lim, Hyung-Jin Choi, Kyung-Hoon Won, Won-Jun Hwang, Wi-Pil Kang, Kyung-Kyu Kim, Dae-Gyun Kim, Hyun-Seok Ryu, Seung-Hoon Park
  • METHOD AND DEVICE FOR TRANSMITTING AND RECEIVING SIGNAL BY USING MODULATION TECHNIQUES IN WIRELESS COMMUNICATION SYSTEM
    Publication number: 20150358194
    Abstract: Disclosed is a method and device for transmitting and receiving a signal by using modulation techniques in a wireless communication system. The method according to the present invention includes: selecting one of QAM and improved QAM according to at least one predefined criterion; encoding information bits to be transmitted according to a first encoding scheme and mapping encoded information bits to QAM symbols when the QAM is selected; encoding information bits to be transmitted according to a second encoding scheme and mapping encoded information bits to improved QAM symbols when the improved QAM is selected; and transmitting the QAM symbols or the improved QAM symbols through a given resource region.
    Type: Application
    Filed: December 23, 2013
    Publication date: December 10, 2015
    Inventors: Hyun-Kyu Yu, Won-Il Roh, Jeong-Ho Park, Min Sagong, Ji-Yun Seol, Chi-Woo Lim, Kyung-Whoon Cheun, Jae-Weon Cho, Sung-Nam Hong
  • Apparatus and method for transmitting preamble in a wireless communication system
    Patent number: 9210019
    Abstract: An apparatus and method for reducing a Peak to Average Power Ratio (PAPR) of a Secondary Advanced (SA) preamble in a wireless communication system are provided. A method for transmitting an SA preamble includes determining an SA preamble, constructed in a unit of subblocks, according to a frequency band to be used for transmitting information, determining a sequence for reducing a PAPR of the SA preamble in consideration of at least one of a frequency band, a segment IDentifier (ID), and the number of antennas transmitting the SA preamble, updating the SA preamble using the determined sequence, and transmitting the updated SA preamble to a receive end.
    Type: Grant
    Filed: June 23, 2010
    Date of Patent: December 8, 2015
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Chi-Woo Lim, Sung-Eun Park
  • Apparatus and method for operating a sounding antenna switching scheme in a mobile communication system
    Patent number: 9209879
    Abstract: In a mobile communication system, an Advanced Mobile Station (AMS) sends, to an Advanced Base Station (ABS), a message including information indicating whether the AMS supports a sounding antenna switching scheme. If the information indicates that the AMS supports the sounding antenna switching scheme, the message including the information includes information indicating an antenna configuration that the AMS desires to use in a sounding antenna switching operation.
    Type: Grant
    Filed: July 12, 2011
    Date of Patent: December 8, 2015
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Chi-Woo Lim, Tae-Young Kim, Mi-Hyun Lee
  • METHOD AND APPARATUS FOR DECODING NON-BINARY LOW DENSITY PARITY CHECK CODE IN COMMUNICATION SYSTEM
    Publication number: 20150349801
    Abstract: A method for decoding a non-binary Low Density Parity Check (LDPC) code by a decoding apparatus in a communication system is provided. The method includes selecting a predetermined number of symbol messages from among received symbol messages, performing a variable node update process on the selected symbol messages to generate variable node updated symbol messages, performing a check node update process on the variable node updated symbol messages, and performing a decoding operation based on the result of the variable node update process and the check node update process, wherein the performing of the check node update process includes generating an intermediate message for the variable node updated symbol messages using symbol messages which are selected based on reliability, and generating an output message of each edge between a variable node and a check node.
    Type: Application
    Filed: May 29, 2015
    Publication date: December 3, 2015
    Inventors: Woo-Myoung PARK, Kyeong-Cheol YANG, Sang-Min KIM, Min SAGONG, Seok-Ki AHN, Chi-Woo LIM, Sung-Nam HONG
  • DECODING METHOD, APPARATUS, AND ALGORITHM FOR NONBINARY LDPC CODES
    Publication number: 20150295592
    Abstract: Provided is a method for decoding a non-binary (NB) low density parity check (LDPC) code at a user equipment (UE) that implements at least one variable nodes that receive a received signal of a wireless channel and deliver an input message to a check node and the check node that checks the input message and outputs an output message. The method includes receiving at least one input messages, generating a temporary vector by using the at least one input messages, searching for an element having a dominant value by checking the temporary vector, generating a configuration set, which is a check target, by using the element having the dominant value, and generating the output message by performing comparison with respect to the generated configuration set.
    Type: Application
    Filed: April 14, 2015
    Publication date: October 15, 2015
    Inventors: Seok-Ki Ahn, Kyeong-Cheol Yang, Sang-Min Kim, Woo-Myoung Park, Min Sagong, Chi-Woo Lim, Sung-Nam Hong
  • Method and apparatus for generating connection identifier for device-to-device communication
    Patent number: 9155115
    Abstract: A method and a device for generating a CID for D2D communication are provided. A transmitting device transmits a request for direct communication between the transmitting device and a receiving device on a resource unit of a first resource index determined based upon at least one of a device ID of the transmitting device or of the receiving device during a first period, receives information about at least one used CID being used by at least one surrounding device from the peripheral device during a second period, transmits information including at least one available CID acquired during the second period on a resource unit of a second resource index being identical to the first resource index during a third period, and determines at least one CID to be used for D2D communication between the transmitting device and the receiving device based on the transmitted information.
    Type: Grant
    Filed: October 18, 2012
    Date of Patent: October 6, 2015
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Chi-Woo Lim, Kyung-Kyu Kim, Seung-Hoon Park
  • DECODING APPARATUS AND METHOD IN MOBILE COMMUNICATION SYSTEM USING NON-BINARY LOW-DENSITY PARITY-CHECK CODE
    Publication number: 20150280744
    Abstract: A decoding method in a mobile communication system using a non-binary LDPC code according to various embodiments of the present disclosure includes: selecting a message value having the highest reliability from each column and each row of an input vector message; generating a configuration set using the message value selected for each column and a GL element corresponding to the message value; and generating a check node output message using the generated configuration set and an extra output message value. According to various embodiments of the present disclosure, a decoding time period is reduced.
    Type: Application
    Filed: March 27, 2015
    Publication date: October 1, 2015
    Inventors: Sang-Min Kim, Woo-Myoung Park, Seok-Ki Ahn, Chi-Woo Lim
  • APPARATUS AND METHOD FOR CORRECTING ERROR IN MOBILE COMMUNICATION SYSTEM USING NON-BINARY LOW-DENSITY PARITY-CHECK CODES
    Publication number: 20150263763
    Abstract: Various embodiments of the present disclosure adjusts the size (nm) of a message input to a corresponding check node in case the unsatisfied check equation increases as the iteration count increases. Another embodiment of the present disclosure relates to a method for selecting a message and grasps the data distribution characteristics of the message vector values converted using the signal to noise ratio (SNR) and modulation and coding scheme (MCS) parameters of the receiver to select the message value with a value smaller than the threshold value in each message vector.
    Type: Application
    Filed: March 12, 2015
    Publication date: September 17, 2015
    Inventors: Sang-Min Kim, Woo-Myoung Park, Chi-Woo Lim
  • APPARATUS AND METHOD FOR CHANNEL QUALITY INFORMATION FEEDBACK IN WIRELESS COMMUNICATION SYSTEM USING FREQUENCY QUADRATURE AMPLITUDE MODULATION
    Publication number: 20150230118
    Abstract: A method of operating a base station in a wireless communication system supporting frequency and quadrature-amplitude modulation (FQAM) is provided. The method includes receiving channel quality information and non-Gaussian information for a data region from a mobile station, and determining a MCS level on the basis of the channel quality information and the non-Gaussian information.
    Type: Application
    Filed: February 10, 2015
    Publication date: August 13, 2015
    Inventors: Chi-Woo Lim, Min Sagong, Sung-Nam Hong, Hyun-Kyu Yu, Kyung-Whoon Cheun
  • APPARATUS AND METHOD FOR ADAPTIVELY SELECTING CHANNEL CODE BASED ON NON-GAUSSIANITY OF CHANNEL IN WIRELESS COMMUNICATION SYSTEM
    Publication number: 20150222472
    Abstract: A method and apparatus are provided for adaptive channel code selection according to a non-Gaussianity of a channel in a wireless communication system. A method includes receiving channel feedback information from a receiving node; selecting, based on the channel feedback information, a channel code among a plurality of channels code having different degree distributions of repetition codes; and encoding transmission data based on the selected channel code.
    Type: Application
    Filed: April 14, 2015
    Publication date: August 6, 2015
    Inventors: Woo-Myoung PARK, Sang-Min Kim, Chi-Woo Lim
  • Apparatus and method for broadcast in system performing inter-device direct communication
    Patent number: 9100204
    Abstract: A method and an apparatus for broadcasting data using a frame structure having a plurality of sections in a system performing inter-device direct communication are provided. In the method, whether there is data to broadcast is determined. Broadcast indicate information is exchanged with neighbor devices via a retrieve section for retrieving information about neighbor devices, the broadcast indicate information representing an indication of whether data is broadcast. A data transmission section is divided into a broadcast section and a unicast section. A broadcast signal is received during the broadcast section.
    Type: Grant
    Filed: August 29, 2012
    Date of Patent: August 4, 2015
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Chi-Woo Lim, Kyung-Kyu Kim, Seung-Hoon Park