Patents by Inventor Byung-Shik Kang

Byung-Shik 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).

  • Coherent dual-channel QPSK modulator/demodulator for CDMA systems, and modulating/demodulating methods therefor
    Patent number: 5960029
    Abstract: A coherent dual-channel QPSK modulator/demodulator for a CDMA system, and modulating/demodulating methods therefor, are disclosed, in which the crosstalk interferences between an I-channel and a Q-channel are eliminated by an orthogonal spreading method, which assigns different Walsh codes to the I-channel and Q-channel. Pseudo-random modulation and pseudo-random demodulation are carried out by using one PN code so as to minimize the channel parameter estimation errors, thereby improving receiving performance.
    Type: Grant
    Filed: September 30, 1996
    Date of Patent: September 28, 1999
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Seong-Rag Kim, Hun Lee, Byung-Shik Kang, Jae-Wook Jung