Patents by Inventor Xin-Xing Yang

Xin-Xing Yang 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).

  • Apparatus and method for generating a multicarrier communication signal having a reduced crest factor
    Patent number: 8259846
    Abstract: An apparatus for generating a multicarrier communication signal having a reduced crest factor enables efficient power amplifier operation. The apparatus includes a plurality of shaping filters (205-n) for outputting a plurality of shaped baseband transmission signals. A plurality of mixers (210-n) then multiplies each signal by one of a plurality of complex carrier signals. A window function generator (235) generates a clipping window signal based on power levels of the unshaped baseband transmission signals. A plurality of window output units (245-n) outputs a plurality of subtraction-based clipping window signals. At least one summing unit (260) then generates the multicarrier communication signal having the reduced crest factor from the plurality of subtraction-based clipping window signals and the plurality of shaped baseband transmission signals.
    Type: Grant
    Filed: July 30, 2008
    Date of Patent: September 4, 2012
    Assignee: Motorola Mobility LLC
    Inventors: Xin Liang, Xin-Xing Yang
  • APPARATUS AND METHOD FOR GENERATING A MULTICARRIER COMMUNICATION SIGNAL HAVING A REDUCED CREST FACTOR
    Publication number: 20100027690
    Abstract: An apparatus for generating a multicarrier communication signal having a reduced crest factor enables efficient power amplifier operation. The apparatus includes a plurality of shaping filters (205-n) for outputting a plurality of shaped baseband transmission signals. A plurality of mixers (210-n) then multiplies each signal by one of a plurality of complex carrier signals. A window function generator (235) generates a clipping window signal based on power levels of the unshaped baseband transmission signals. A plurality of window output units (245-n) outputs a plurality of subtraction-based clipping window signals. At least one summing unit (260) then generates the multicarrier communication signal having the reduced crest factor from the plurality of subtraction-based clipping window signals and the plurality of shaped baseband transmission signals.
    Type: Application
    Filed: July 30, 2008
    Publication date: February 4, 2010
    Applicant: MOTOROLA, INC.
    Inventors: Xin Liang, Xin-Xing Yang