Patents by Inventor Chung Gu Kang

Chung Gu Kang 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).

  • Publication number: 20060078059
    Abstract: An apparatus and method for allocating transmission power of a subchannel for each individual user in an orthogonal frequency division multiple access (OFDMA) system. The apparatus and method comprises determining the number-of-transmission bits per symbol approximating an estimated signal-to-interference ratio (SIR) for each of subchannels when transmission power is uniformly allocated to the subchannels; and calculating a required SIR corresponding to the number-of-transmission bits per symbol, and allocating transmission power to each of the subchannels according to the required SIR.
    Type: Application
    Filed: October 11, 2005
    Publication date: April 13, 2006
    Inventors: Kwang-Man Ok, Chung-Gu Kang, Min-Goo Kim, Wi-Sang Rho
  • Publication number: 20060045195
    Abstract: A transmission and reception apparatus and method for use in a wireless communication system, and an apparatus and method for adaptively transmit and receive a signal according to channel state in a wireless communication system. An apparatus for adaptively performing transmission according to a state of a channel transmitted from a transmitter to at least one receiver includes a signal to interference ratio estimator for estimating a signal to interference ratio of the channel using a signal transmitted from the at least one receiver; and an adaptive transmitter for transmitting data to the at least one receiver on a basis of the estimated signal to interference ratio.
    Type: Application
    Filed: September 2, 2005
    Publication date: March 2, 2006
    Inventors: Kwang-Man Ok, Chung-Gu Kang, Min-Goo Kim, Wi-Sang Rho
  • Publication number: 20060045066
    Abstract: A method for flooding a route request packet that is received at a node in a communication system constructed of at least three nodes including a source node that requests to establish a route and a destination node that receives the route request. One of a plurality of levels having different transmission periods is determined using a strength of a received signal of a measured packet. A transmission start point is selected at the determined level, and it is determined whether a route request packet is re-received before the selected transmission start point. The received packet is broadcast at the selected transmission start point when the packet is not re-received. The transmission start point is randomly selected within the transmission period or at the level in consideration of the number of the connected nodes.
    Type: Application
    Filed: August 31, 2005
    Publication date: March 2, 2006
    Inventors: Soon-jin Choi, Il-whan Kim, Chung-gu Kang, Min-seop Jeong, Yu-jin Lim
  • Publication number: 20060012559
    Abstract: A speaker apparatus for a mobile communications terminal includes a display window acts as a speaker by using the display window as a vibration plate. As a result, sound in lower frequency range can be reproduced. In addition, through use of filters, frequency characteristics can be further enhanced.
    Type: Application
    Filed: July 14, 2005
    Publication date: January 19, 2006
    Inventor: Chung-Gu Kang
  • Publication number: 20060013329
    Abstract: A signal transmitting device and method are provided which separate signals simultaneously transmitted through a multiple-antenna system into respective sub-channel signals. The method includes separating a transmission channel into spatial sub-channels in a time division duplex (TDD) system using a multiple-antenna system. The factors for channel separation of a current time slot are calculated using one of the factors calculated during a previous time slot, thereby reducing computational complexity.
    Type: Application
    Filed: July 13, 2005
    Publication date: January 19, 2006
    Inventors: Kwang-Hee Han, Chung-Gu Kang
  • Publication number: 20060007849
    Abstract: A dynamic resource allocation method in an OFDMA system is provided. A base station determines if each of a plurality of SSs supports subchannel-based dynamic resource allocation. If an SS supports the subchannel-based dynamic resource allocation, the base station allocates resources to the SS on a subchannel basis. If the SS does not support the subchannel-based dynamic resource allocation, the base station allocates resources to the SS on a burst basis.
    Type: Application
    Filed: July 11, 2005
    Publication date: January 12, 2006
    Inventors: Il-Whan Kim, Sang-Boh Yun, Sung-Hyun Cho, Won-Hyoung Park, Chung-Gu Kang, Jeong-Hwan Lee
  • Publication number: 20050286451
    Abstract: Provided is a connection identification (CID) allocating method in a Broadband Wireless Access (BWA) communication system having a medium access control protocol data unit (MAC PDU) format with a header field including control information and a payload field including user data. The header field has a first CID field of a first length indicating a CID of a mobile subscriber station (MSS), a second CID field of a second length and indicating the CID of the MSS by being concatenated with a CID of the first CID field, and a type field indicating whether the second CID field is used. The method includes determining a CID to be allocated to a particular MSS; and if the length of the determined CID is equal to the first length, including the determined CID in the first CID field, including, in the type field, information indicating that the second CID field is not used, and transmitting the MAC PDU to the MSS.
    Type: Application
    Filed: May 10, 2005
    Publication date: December 29, 2005
    Inventors: Il-Whan Kim, Sung-Hyun Cho, Sang-Boh Yun, Won-Hyoung Park, Chung-Gu Kang, Jeong-Hwan Lee
  • Publication number: 20050089057
    Abstract: An ad-hoc network wireless communication system transmits data packets from one hop to another hop in a relay manner, and includes a transmitting node for transmitting a RTS message in order to transmit the data packets, and a receiving node, existing in a next hop of the transmitting node, for transmitting a CTS message in response to the RTS message transmitted from the transmitting node. The receiving node transmits the CTS message to another receiving node successively connected to the receiving node in response to the transmitted CTS message, and the transmitting node transmits the data packets to the receiving node in the case that the CTS message transmitted by the receiving node of the next hop is received over a predetermined number of times. The ad-hoc network wireless communication system can maximize the communication efficiency in a multi-hop network with its complexity minimized by extending a MAC protocol based on a IEEE 802.11 DCF to a reservation-based MAC in the multi-hop network.
    Type: Application
    Filed: September 1, 2004
    Publication date: April 28, 2005
    Inventors: Chung-gu Kang, Won-soo Kim, Il-whan Kim
  • Publication number: 20040153909
    Abstract: An adaptive hybrid automatic repeat request system and method, which comprise (a) transmitting a data frame comprised of a data bit and a parity bit that are channel-coded using a predetermined initial coding rate; (b) receiving the data frame, performing channel decoding of the received data frame, and when an error exists in the channel-decoded data frame, correcting the error; (c) when there is no error in the channel-decoded data frame or the error is corrected, transmitting an ACK message to a transmitting terminal; (d) when the error of the channel-decoded data frame is not corrected, measuring an error degree of a corresponding frame and transmitting a NACK message to which the measured error degree is added, to the transmitting terminal; (e) retransmitting a parity frame that is generated by performing channel coding of a parity bit corresponding to a parity level determined in accordance with the error degree added to the NACK message; and (f) combining the retransmitted parity bit with a data bit of
    Type: Application
    Filed: September 17, 2003
    Publication date: August 5, 2004
    Inventors: Dong-Sun Lim, Chung-Gu Kang, Sang-Boh Yun
  • Patent number: 6615382
    Abstract: A method for controlling errors in a wireless link layer using a simultaneous multiple copy scheme and an adaptive forward error correction (FEC) scheme in a wideband wireless communication is provided.
    Type: Grant
    Filed: August 28, 2000
    Date of Patent: September 2, 2003
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Woo-shik Kang, Kyung Hun Jang, Chung-gu Kang, Chang-wook Ahn
  • Publication number: 20030031278
    Abstract: A decoding apparatus and method in an OFDM (Orthogonal Frequency Division Multiplexing) communication system. In the OFDM system, a channel with a given frequency band is divided into a plurality of sub-channels spaced from one another in predetermined intervals, pilot symbols are transmitted on predetermined sub-channels, and data symbols are transmitted on the other sub-channels. A channel estimator generates a first channel estimate for each of the data symbols using the pilot symbols, a log likelihood ratio calculator calculates the reception probability of each information bit in the data symbol based on the first channel estimate, and a decoder generates the estimated probability values of the information bits based on the reception probability values of the information bits in the data symbol.
    Type: Application
    Filed: May 13, 2002
    Publication date: February 13, 2003
    Inventors: Chung-Gu Kang, Seung-Young Park, Bo-Seok Seo, Jung-Je Son
  • Patent number: 6249515
    Abstract: A multiple access control method for guaranteeing a QoS requirement is disclosed. The method includes the steps of a first step in which the random access channel is separated into a plurality of sub-slots, and one of the thusly separated sub-channels is designated as a forced collision sub-slot and is shared for a mobile station which is sensitive to a reservation delay time, and a second step in which capacity-back (CB) sub-slots are designated one-by-one with respect to the mobile station, which is sensitive to the reservation delay time in the next slot when a collision occurs in the designated forced sub-slot and a reservation request is performed without a predetermined competition.
    Type: Grant
    Filed: July 28, 1998
    Date of Patent: June 19, 2001
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Yong Jin Kim, Jang Kyung Kim, Chung Gu Kang
  • Patent number: 5227435
    Abstract: A process for preparing polyester resins for powder coatings by using monomers having a low glass transition temperature and silicone compounds comprises (1) condensation reacting silicone compounds with alcohols having at least two hydroxyl groups, (2) reacting resins prepared by the step (1) with acidic compounds in the presence of esterification catalysts, and (3) reacting resins prepared by step (2) with trimellitic anhydride in the presence of catalysts to form polyester resins having an acid value of 30 to 100, a low melting viscosity, a low softening point, excellent storage stability, good heat-resistance and a good appearance.
    Type: Grant
    Filed: December 12, 1990
    Date of Patent: July 13, 1993
    Assignee: Korea Chemical Co., Ltd.
    Inventors: Chung-gu Kang, Bong-jin Kim