Patents by Inventor Dong-Wook Roh

Dong-Wook Roh 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).

  • Method for transmitting reference signals in a downlink multiple input multiple output system
    Patent number: 8619693
    Abstract: In a system having a plurality of cells participating in a Coordinated Multi-Point (CoMP) operation, a method for transmitting Reference Signals (RSs) to User Equipment (UE) includes generating, by Base Station (BS) included in each of the plurality of cells, a subframe including RSs for a UE located in the each of the plurality of cells, and transmitting the generated subframe to the UE by the BS. The RSs include RSs for channel measurement, and RSs for data demodulation, the plurality of cells are grouped according to frequency shift values applied to the RSs for channel measurement and RS allocation patterns are determined for two cells among the plurality of cells according to a predetermined rule.
    Type: Grant
    Filed: December 2, 2009
    Date of Patent: December 31, 2013
    Assignee: LG Electronics Inc.
    Inventors: Yu Jin Noh, Dong Wook Roh, Joon Kui Ahn, Byeong Woo Kang, Dae Won Lee, Bong Hoe Kim, Dong Youn Seo
  • Packet data transmitting method and mobile communication system using the same
    Patent number: 8615696
    Abstract: A packet data transmitting method and mobile communication system using the same enables transmission of common ACK/NACK information from each sector of a base station to a user entity in softer handover. The method includes receiving via at least one of the plurality of sectors a data packet from the mobile terminal, the data packet being correspondingly received for each of the at least one of the plurality of sectors; combining the correspondingly received data packets, to obtain a signal having a highest signal-to-noise ratio; decoding the value obtained by the combining; determining a transmission status of the data packet according to the decoding; and transmitting to the mobile terminal a common ACK/NACK signal including one of a common ACK signal and a common NACK signal according to the determining, the common ACK/NACK signal being transmitted via each of the at least one sector.
    Type: Grant
    Filed: May 30, 2008
    Date of Patent: December 24, 2013
    Assignee: LG Electronics Inc.
    Inventors: Bong Hoe Kim, Joon Kui Ahn, Hak Seong Kim, Dong Wook Roh, Dong Youn Seo, Seung Hwan Won
  • METHOD AND APPARATUS FOR TRANSMITTING PLCP FRAME IN WIRELESS LOCAL AREA NETWORK SYSTEM
    Publication number: 20130336257
    Abstract: A method of transmitting a Physical Layer Convergence Procedure (PLCP) frame in a Very High Throughput (VHT) Wireless Local Area Network (WLAN) system includes generating a MAC Protocol Data Unit (MPDU) to be transmitted to a destination station (STA), generating a PLCP Protocol Data Unit (PPDU) by adding a PLCP header, including an L-SIG field containing control information for a legacy STA and a VHT-SIG field containing control information for a VHT STA, to the MPDU, and transmitting the PPDU to the destination STA. A constellation applied to some of Orthogonal Frequency Division Multiplex (OFDM) symbols of the VHT-SIG field is obtained by rotating a constellation applied to an OFDM symbol of the L-SIG field.
    Type: Application
    Filed: July 16, 2013
    Publication date: December 19, 2013
    Inventors: Dae Won LEE, Dong Wook ROH, Byeong Woo KANG, Yong Ho SEOK, Yu Jin NOH, Bong Hoe KIM
  • Method for receiving downlink signal in multi-antenna wireless communication system and device therefor
    Patent number: 8611282
    Abstract: Disclosed in a method for a terminal to receive a downlink signal in a multi user MIMO (MU-MIMO) wireless communication system. More specifically, the method comprises the steps of: receiving downlink control information (DCI) from a base station; obtaining a parameter for a downlink demodulating-reference signal (DM-RS) included in the downlink control information; receiving the downlink DM-RS specified to the terminal on the basis of the parameter; and receiving a downlink data signal on the basis of the downlink DM-RS specified in the terminal, wherein the parameter includes information on a rank which is set in the terminal and a logical antenna port in which the downlink DM-RS is defined.
    Type: Grant
    Filed: July 19, 2010
    Date of Patent: December 17, 2013
    Assignee: LG Electronics Inc.
    Inventors: Bong Hoe Kim, Byeong Woo Kang, Yu Jin Noh, Dong Wook Roh, Dae Won Lee
  • METHOD AND APPARATUS FOR ALLOCATING A PLURALITY OF DATA SYMBOLS IN A WIRELESS COMMUNICATION SYSTEM
    Publication number: 20130329824
    Abstract: According to one embodiment, a method for transmitting an uplink signal includes transmitting the uplink signal including a block of data symbols. The block of data symbols are mapped to at least two sets of subcarrier blocks. Each data symbol of the block of data symbols is mapped to one of subcarriers of the at least two sets of subcarrier blocks. The at least two sets of subcarrier blocks are not contiguous in frequency. The block of data symbols are mapped in sequence starting with a first data symbol to the at least two sets of subcarrier blocks and in increasing order of subcarrier index.
    Type: Application
    Filed: August 9, 2013
    Publication date: December 12, 2013
    Applicant: LG ELECTRONICS INC.
    Inventors: Hak Seong KIM, Bong Hoe KIM, Dong Wook ROH, Joon Kui AHN, Dong Youn SEO, Jung Hoon LEE
  • Method for transmitting data by applying precoding matrix in an open loop MIMO system
    Patent number: 8594036
    Abstract: A method for transmitting data by applying a precoding matrix in an open-loop multiple input multiple output (MIMO) system is disclosed. The method comprises selecting a precoding matrix and applying the selected precoding matrix to data during initial transmission; selecting a precoding matrix and applying the selected precoding matrix to data to be retransmitted; and retransmitting the data to which the precoding matrix is applied, wherein an index of the precoding matrix applied to the data is determined based on the times of current retransmission times of the data and index of the precoding matrix applied during initial transmission of the data.
    Type: Grant
    Filed: May 26, 2010
    Date of Patent: November 26, 2013
    Assignee: LG Electronics Inc.
    Inventors: Byeong Woo Kang, Dong Wook Roh, Dae Won Lee, Yu Jin Noh, Bong Hoe Kim, Joon Kui Ahn
  • Transmitting spread signal in communication system
    Patent number: 8582626
    Abstract: A method for receiving Acknowledgement/Negative acknowledgement (ACK/NACK) information in a mobile communication system includes receiving a first signal including first spread ACK/NACK information and second spread ACK/NACK information from a first antenna set of a transmitting end in an orthogonal frequency division multiplexing (OFDM) symbol; receiving a second signal including third spread ACK/NACK information and fourth spread ACK/NACK information from a second antenna set of the transmitting end in an OFDM symbol; and de-spreading at least the first and third spread ACK/NACK information or the second and fourth spread ACK/NACK information for identifying the ACK/NACK information.
    Type: Grant
    Filed: February 1, 2013
    Date of Patent: November 12, 2013
    Assignee: LG Electronics Inc.
    Inventors: Jung Hoon Lee, Ki Jun Kim, Dong Wook Roh, Daewon Lee, Joon Kui Ahn
  • METHOD AND APPARATUS OF LINK ADAPTATION IN A WIRELESS LOCAL AREA NETWORK SYSTEM
    Publication number: 20130294397
    Abstract: A method of transmitting modulation and coding scheme (MCS) feedback (MFB) in a wireless local area network system is provided. The method is performed by a first station and includes receiving, from a second station, a physical layer convergence procedure(PLCP) protocol data unit(PPDU), estimating a MFB based on the PPDU and transmitting, to the second station, C feedback information including a MFB field and a MFB type field. The MFB field includes the MFB and the MFB type field indicates whether or not the MFB is in response to a MFB request(MRQ) of the second station.
    Type: Application
    Filed: December 22, 2011
    Publication date: November 7, 2013
    Applicant: LG ELECTRONICS INC.
    Inventors: Dae Won Lee, Byeong Woo Kang, Yong Ho Seok, Dong Wook Roh
  • METHOD FOR TRANSMITTING CONTROL INFORMATION, AND METHOD FOR GENERATING CODEWORD FOR THE SAME
    Publication number: 20130286981
    Abstract: A method for transmitting downlink control information and a method for generating a codeword for the same are disclosed. In generating a long code having a low code rate, a basic code of which minimum distance between codes is maximized is repeated by a prescribed number of times and bits of the repeated code are adjusted. Therefore, a minimum distance condition between codes of a long code is satisfied and simultaneously the code be simply generated.
    Type: Application
    Filed: June 26, 2013
    Publication date: October 31, 2013
    Inventors: Dong Wook ROH, Bong Hoe KIM, Young Woo YUN, Dong Youn SEO, Dae Won LEE, Jung Hoon LEE, Joon Kui AHN, Ki Jun KIM
  • Method for generating reference signal sequence in multi-antenna wireless communication system and apparatus for same
    Patent number: 8565268
    Abstract: The present application discloses a method in which a base station transmits a reference signal sequence in a wireless communication system. In detail, the method comprises the steps of: generating a pseudo-random sequence using a first m-sequence and a second m-sequence; generating the reference signal sequence using the pseudo-random sequence; and transmitting the reference signal to a mobile station via antenna ports different from one another. The second m-sequence has an initial value containing parameters for discriminating reference signal sequences among users.
    Type: Grant
    Filed: April 29, 2010
    Date of Patent: October 22, 2013
    Assignee: LG Electronics Inc.
    Inventors: Bong Hoe Kim, Byeong Woo Kang, Dae Won Lee, Yu Jin Noh, Ki Jun Kim, Dong Wook Roh
  • METHOD OF ALLOCATING UPLINK TRANSMISSION CHANNELS IN A COMMUNICATION SYSTEM
    Publication number: 20130272239
    Abstract: A method of allocating channels in a user equipment is disclosed. In particular, a method of allocating a plurality of Dedicated Physical Channels (DPCHs) and Enhanced Dedicated Channels (E-DCHs) in a user equipment of a multicode transmission system. The method includes determining whether a High Speed Downlink Shared Channel (HS-DSCH) is configured for the user equipment (UE) and determining a number of codes used by the DPCH and the E-DCH. The method further includes allocating the DPCH and the E-DCH channels to an I branch or a Q branch based on the number of codes used by the DPCH and the E-DCH and the HS-DSCH configuration.
    Type: Application
    Filed: June 4, 2013
    Publication date: October 17, 2013
    Inventors: Bong Hoe KIM, Joon Kui AHN, Hak Seong KIM, Dong Wook ROH, Dong Youn SEO, Seung Hwan WON
  • Method for transmitting a downlink signal in a multi-antenna wireless communication system, and apparatus for same
    Patent number: 8559403
    Abstract: The present application discloses a method for transmitting a downlink signal in a multi-antenna wireless communication system. In detail, the method comprises: a step of mapping a signal of a codeword domain to a signal of a layer domain; a step of mapping the signal of the layer domain to a signal of a virtual antenna port domain using a precoding matrix; and a step of transmitting the signal of the virtual antenna port domain to a physical antenna port, wherein the precoding matrix is changed in a channel measurement unit, and the signal of the layer domain is layer-permutated in the channel measurement unit. Preferably, the channel measurement unit is constituted by one or more resource blocks (RBs).
    Type: Grant
    Filed: June 29, 2010
    Date of Patent: October 15, 2013
    Assignee: LG Electronics Inc.
    Inventors: Dae Won Lee, Dong Wook Roh, Byeong Woo Kang, Yu Jin Noh, Byoung Hoon Kim, Bong Hoe Kim
  • Method for receiving ACK/NACK signal in mobile communication system
    Patent number: 8553638
    Abstract: A method for transmitting information of resources for use in transmission of ACK/NACK signals in a mobile communication system is disclosed. An example method for receiving ACK/NACK signals in a mobile communication system is also disclosed. When resources for transmission of data and resources for transmission of control information of the data are scheduled through virtual unit resources, the method identifies information of resources for receiving an ACK/NACK signal for transmission data mapped to information of at least one of a virtual unit resource allocated to the transmission data and a virtual unit resource allocated to control information of the transmission data, and receives the ACK/NACK signal for the transmission data through the information of resources for receiving the ACK/NACK signal.
    Type: Grant
    Filed: November 14, 2011
    Date of Patent: October 8, 2013
    Assignee: LG Electronics Inc.
    Inventors: Dae Won Lee, Bong Hoe Kim, Young Woo Yun, Ki Jun Kim, Dong Wook Roh, Suk Hyon Yoon, Joon Kui Ahn, Dong Youn Seo, Hak Seong Kim, Jung Hoon Lee, Eun Sun Kim, Sung Duk Choi
  • Signal transmission method using CDM against the effect of channel estimation error in transmit diversity system
    Patent number: 8553668
    Abstract: A method of transmitting a signal using code division multiplexing (CDM) in order to reduce the influence of channel estimation error in a multi-input multi-output antenna (MIMO) system using transmit diversity is disclosed. That is, the method of transmitting a signal by a transmitter using a plurality of antennas includes code division multiplexing input symbols using codes according to a predetermined spreading matrix, and transmitting the code division multiplexed symbols via the plurality of antennas according to an Alamouti scheme. At this time, the predetermined spreading matrix is set such that a first component and a second component configuring interference due to channel estimation error have orthogonal phases.
    Type: Grant
    Filed: August 12, 2008
    Date of Patent: October 8, 2013
    Assignee: LG Electronics Inc.
    Inventors: Dong Wook Roh, Bong Hoe Kim, Suk Hyon Yoon, Dong Youn Seo, Jung Hoon Lee, Dae Won Lee, Hak Seong Kim, Joon Kui Ahn, Ki Jun Kim
  • Method of transmitting data in a wireless communication system
    Patent number: 8542697
    Abstract: A method of transmitting data in a wireless communication system is provided. The method includes transmitting downlink scheduling information regarding downlink radio resource allocation and uplink scheduling information regarding uplink radio resource allocation on a downlink control channel, transmitting downlink data on a downlink data channel according to the downlink scheduling information, and detecting an acknowledgement (ACK)/negative-acknowledgement (NACK) signal for the downlink data from a radio resource exclusively allocated to the ACK/NACK signal. According to the present invention, when an error occurs in a downlink control channel due to deterioration of a channel condition, the error can be promptly handled using an error detection protocol agreed between a user equipment and a base station. Therefore, data can be transmitted with higher reliability.
    Type: Grant
    Filed: June 13, 2008
    Date of Patent: September 24, 2013
    Assignee: LG Electronics Inc.
    Inventors: Hak Seong Kim, Bong Hoe Kim, Dong Wook Roh, Dae Won Lee, Suk Hyon Yoon, Dong Youn Seo
  • Methods of joint coding in mobile communication system
    Patent number: 8543885
    Abstract: A joint coding method in a mobile communication system is disclosed. To block-code k?-bit first data requiring a received signal quality and k2˜bit second data requiring a different received signal quality, the present invention includes configuring a first block code generation matrix meeting a first minimum hamming distance, configuring a second block code generation matrix meeting a second minimum hamming distance, and configuring a third block code generation matrix including the first block code generation matrix, the second block code generation matrix and a zero matrix of a specific size. Accordingly, the present invention encodes and transmits two data requiring different received signal qualities by one coding scheme, thereby enabling each data to have the required received signal quality in decoding.
    Type: Grant
    Filed: November 13, 2008
    Date of Patent: September 24, 2013
    Assignee: LG Electronics Inc.
    Inventors: Dae Won Lee, Dong Wook Roh, Bong Hoe Kim, Nam Yul Yu, Ki Jun Kim
  • METHOD AND APPARATUS FOR DETERMINING MODULATION AND CODING SCHEME FEEDBACK IN WIRELESS LOCAL AREA NETWORK SYSTEM
    Publication number: 20130235836
    Abstract: The present invention relates to a method of determining a Modulation and Coding Scheme (MCS) feedback in a Wireless Local Area Network (WLAN) system, including an MCS FeedBack (MFB) responder receiving a first frame, including a request message requesting to send the MFB, from an MFB requester and the MFB responder sending the MFB, including a recommended MCS value, to the MFB requester. The recommended MCS value is derived with reference to at least one of unsolicit type information indicative of a type of the MFB, transmit type information indicative of a transmission type of data, coding type information indicative of a coding scheme applied to the data, a group ID indicative of a group of target stations (STAs) to which the data will be transmitted, and MFB bandwidth information indicative of a bandwidth of a channel.
    Type: Application
    Filed: November 14, 2011
    Publication date: September 12, 2013
    Applicant: LG ELECTRONICS INC.
    Inventors: Dong Wook Roh, Ill Soo Sohn, Kyoung Young Song, Dae Won Lee, Yong Ho Seok
  • Method and apparatus for allocating a plurality of data symbols in a wireless communication system
    Patent number: 8526514
    Abstract: A method of allocating a plurality of data symbols from a transmitting end using multiple carrier modulation (MCM) is disclosed. More specifically, the method includes receiving the plurality of data symbols from a serial-to-parallel converter, grouping the plurality data symbols into at least one data symbol group, wherein the at least one data symbol group is formed by grouping a specified number of neighboring data symbols, and allocating the at least one data symbol group to at least one subcarrier group, wherein the at least one subcarrier group is formed by grouping a plurality of subcarriers.
    Type: Grant
    Filed: June 13, 2006
    Date of Patent: September 3, 2013
    Assignee: LG Electronics Inc.
    Inventors: Hak Seong Kim, Bong Hoe Kim, Dong Wook Roh, Joon Kui Ahn, Dong Youn Seo, Jung Hoon Lee
  • METHOD AND APPARATUS FOR TRANSCEIVING A DATA FRAME IN A WIRELESS LAN SYSTEM
    Publication number: 20130208715
    Abstract: A method of transmitting a data frame by a transmitter in a WLAN system is provided. The method includes generating a data block including at least one data units respectively transmitted through at least one or more spatial streams to at least one receiver, transmitting first control information to the at least one receiver, transmitting second control information to each receiver, and transmitting the data block to the at least one receiver. The first control information includes a length indicator for the data block, a MIMO indicator indicating whether the data block is for SU-MIMO or MU-MIMO, and a spatial stream indication field including information about the number of the spatial streams. The second control information includes a FEC coding field indicating an encoding scheme applied to the data unit and an MCS field indicating an MCS applied to the data unit.
    Type: Application
    Filed: October 27, 2011
    Publication date: August 15, 2013
    Applicant: LG ELECTRONICS INC.
    Inventors: Dong Wook Roh, Byeong Woo Kang, Dae Won Lee, Yong Ho Seok
  • Method for transmitting control information, and method for generating codeword for the same
    Patent number: 8498345
    Abstract: A method for transmitting downlink control information and a method for generating a codeword for the same are disclosed. In generating a long code having a low code rate, a basic code of which minimum distance between codes is maximized is repeated by a prescribed number of times and bits of the repeated code are adjusted. Therefore, a minimum distance condition between codes of a long code is satisfied and simultaneously the code can be simply generated. Furthermore, control information can be transmitted with a low error rate by using the generated code.
    Type: Grant
    Filed: May 9, 2008
    Date of Patent: July 30, 2013
    Assignee: LG Electronics Inc.
    Inventors: Dong Wook Roh, Bong Hoe Kim, Young Woo Yun, Dong Youn Seo, Dae Won Lee, Jung Hoon Lee, Joon Kui Ahn, Ki Jun Kim