Patents by Inventor Kyoungwoo Heo

Kyoungwoo Heo 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).

  • Polarization division multiplexed optical orthogonal frequency division multiplexing transmitter and receiver
    Patent number: 8693459
    Abstract: Provided is a polarization division multiplexed optical OFDM transmitter. The polarization division multiplexed optical OFDM transmitter includes a data demultiplexer, a training symbol generation unit and an optical up-converter and polarization division multiplexing unit. The data demultiplexer divides a transmission signal into a plurality of groups. The training symbol generation unit allocates a plurality of training symbols for each OFDM data which is included in the respective multiplexed groups, and allocates repetitive data in a time domain for the respective training symbols for data of 0 to periodically appear for the respective training symbols in a frequency domain. The optical up-converter and polarization division multiplexing unit performs optical frequency band conversion and polarization division multiplexing on an output of the training symbol generation unit to output a polarization division multiplexed optical OFDM signal corresponding to a plurality of polarization components.
    Type: Grant
    Filed: May 3, 2010
    Date of Patent: April 8, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Chun Ju Youn, Yong-Hwan Kwon, Jong-Hoi Kim, Joong-Seon Choe, Kwang-Seong Choi, Kyoungwoo Heo, Eun Soo Nam
  • POLARIZATION DIVISION MULTIPLEXED OPTICAL ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING TRANSMITTER AND RECEIVER
    Publication number: 20110096855
    Abstract: Provided is a polarization division multiplexed optical OFDM transmitter. The polarization division multiplexed optical OFDM transmitter includes a data demultiplexer, a training symbol generation unit and an optical up-converter and polarization division multiplexing unit. The data demultiplexer divides a transmission signal into a plurality of groups. The training symbol generation unit allocates a plurality of training symbols for each OFDM data which is included in the respective multiplexed groups, and allocates repetitive data in a time domain for the respective training symbols for data of 0 to periodically appear for the respective training symbols in a frequency domain. The optical up-converter and polarization division multiplexing unit performs optical frequency band conversion and polarization division multiplexing on an output of the training symbol generation unit to output a polarization division multiplexed optical OFDM signal corresponding to a plurality of polarization components.
    Type: Application
    Filed: May 3, 2010
    Publication date: April 28, 2011
    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Chun Ju YOUN, Yong-Hwan Kwon, Jong-Hoi Kim, Joong-Seon Choe, Kwang-Seong Choi, Kyoungwoo Heo, Eun Soo Nam