Patents by Inventor Xiaoling Qin

Xiaoling Qin 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).

  • Receiver in a spread spectrum communication system having low power analog multipliers and adders
    Patent number: 6278724
    Abstract: A signal reception apparatus in the spread spectrum communication system requires only a small amount of circuitry and consumes a small amount of electric power. A quadrature detector decomposes received signals into in-phase components and quadrature components, and supplies them to a complex-type matched filter. The complex-type matched filter de-spreads the in-phase components and the quadrature components and sends them to a multi-path selector. The multi-path selector selects, from among the received de-spread signals, multiple paths having high levels of signal electric powers and sends the received signals of the selected paths to multiple phase correction blocks. Analog operation circuits calculate phase errors of the received signals of two successive pilot symbol blocks for each path. An analog operation circuit corrects the phases of the received signals of the information symbol block that has been received between the two successive pilot symbol blocks.
    Type: Grant
    Filed: March 6, 1998
    Date of Patent: August 21, 2001
    Assignees: Yozan, Inc., NTT Mobile Communications Network, Inc.
    Inventors: Changming Zhou, Guoliang Shou, Kunihiko Suzuki, Xuping Zhou, Xiaoling Qin, Jie Chen, Mamoru Sawahashi, Fumiyuki Adachi
  • Matched filter
    Patent number: 5887024
    Abstract: The present invention provides a matched filter which can refresh an entire while keeping the speed of a calculation comparable to a small sized circuit. The first and second addition circuits of a matched filter of the present invention are classified into a plurality of groups, the first and second auxiliary adders replace functions for the groups of the first and second adders respectively. The outputs of the first and second adders are then inputted to the first and second subtractors, respectively, and the refreshing means appropriately refreshes the groups replaced by the first and second auxiliary adders. Further, the present invention decreases the number of auxiliary sapling and holding circuits to be used, and decides the refreshing intervals by considering the change of the voltage caused by leakage and other permissible errors of output voltage.
    Type: Grant
    Filed: December 26, 1996
    Date of Patent: March 23, 1999
    Assignees: Yozan Inc., Sharp Kabushiki Kaisha
    Inventors: Xiaoling Qin, Kunihiko Suzuki, Guoliang Shou, Changming Zhou, Jie Chen
  • Matched filter circuit
    Patent number: 5841315
    Abstract: An object of the present invention is to provide a matched filter circuit of small size and consuming low electric power. Paying attention that a spreading code is a 1 bit data string, an input signal is sampled and held as an analog signal along the time sequence, classified into "1" and "-1" and the classified signals are added in parallel by capacitive coupling in a matched filter circuit according to the present invention.
    Type: Grant
    Filed: July 26, 1996
    Date of Patent: November 24, 1998
    Assignees: Yozan Inc., Sharp Kabushiki Kaisha
    Inventors: Guoliang Shou, Changming Zhou, Kazunori Motohashi, Xiaoling Qin, Shengmin Lin, Makoto Yamamoto, Sunao Takatori