Patents by Inventor Kyesan Lee

Kyesan Lee 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).

  • Transmitter device and transmitting method using OFDM and MC-CDMA
    Patent number: 7391715
    Abstract: A transmitter device comprises an OFDM transmission unit, a MC-CDMA transmission unit, and a control unit for selecting either the OFDM transmission unit or the MC-CDMA transmission unit at slot time assigned to a receiver device in response to propagation conditions for the receiver device. The propagation conditions are a distance from the receiver device and a CINR.
    Type: Grant
    Filed: October 17, 2003
    Date of Patent: June 24, 2008
    Assignee: KDDI Corporation
    Inventors: Kyesan Lee, Takeo Ohseki, Hiroyasu Ishikawa, Hideyuki Shinonaga
  • Transmitter device and transmitting method using OFDM nd MC-CDMA
    Publication number: 20040141481
    Abstract: A transmitter device comprises an OFDM transmission unit, a MC-CDMA transmission unit, and a control unit for selecting either the OFDM transmission unit or the MC-CDMA transmission unit at slot time assigned to a receiver device in response to propagation conditions for the receiver device. The propagation conditions are a distance from the receiver device and a CINR.
    Type: Application
    Filed: October 17, 2003
    Publication date: July 22, 2004
    Applicant: KDDI CORPORATION
    Inventors: Kyesan Lee, Takeo Ohseki, Hiroyasu Ishikawa, Hideyuki Shinonaga
  • Transmitter device and receiver device adopting space time transmit diversity multicarrier CDMA, and wireless communication system with the transmitter device and the receiver device
    Publication number: 20040116077
    Abstract: A receiver device adopting STTD MC-CDMA scheme, includes a plurality of receive antennas, a plurality of MC-CDMA receive units for respectively converting received signals from the plurality of receive antennas into parallel signals, for respectively performing FFT of the converted parallel signals, for respectively inversely spreading transformed signals, and for respectively equalizing and combining inversely spread signals, STTD decoding units for decoding in time direction and in space direction output signals from the plurality of MC-CDMA receive units, a parallel to serial conversion unit for converting output signals from STTD decoding units into serial signals, a de-mapping unit for de-mapping output serial signals from the parallel to serial conversion unit, and a decoding de-interleaving unit for de-interleaving output signals from the de-mapping means and for decoding de-interleaved data by performing error correction.
    Type: Application
    Filed: July 29, 2003
    Publication date: June 17, 2004
    Applicant: KDDI CORPORATION
    Inventors: Kyesan Lee, Takeo Ohseki, Hiroyasu Ishikawa, Hideyuki Shinonaga