Patents by Inventor Kazuhiko Fukuawa

Kazuhiko Fukuawa 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 and apparatus for equalizing transmission line characteristics which vary at high speed in mobile radio communication
    Patent number: 5436928
    Abstract: In an apparatus for equalization in an impulse response of mobile transmission which varies fast in mobile radio communication, a signal generating circuit outputs a signal sequence undergoing transition at a predetermined period and corresponding to each state transition and a signal sequence corresponding to the path of each state transition. An adaptive filter receives the signal sequence corresponding to each state transition and outputs an estimated signal for each state transition. The apparatus also includes state estimating circuits for performing state estimation by using the square of an estimation error obtained by subtracting each estimated signal from a sampled signal, and a control circuit for controlling the tap coefficient of the adaptive filter by using the RLS algorithm in order to minimize the square of the estimation error.
    Type: Grant
    Filed: April 3, 1992
    Date of Patent: July 25, 1995
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Kazuhiko Fukuawa, Hiroshi Suzuki