Patents by Inventor Xiao Cheng

Xiao Cheng 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).

  • Patent number: 6496531
    Abstract: A method and system for controlling down link transmit power during a soft hand-off in a spread-spectrum wireless system supports independent power control of multiple forward channels to reduce fading. For a soft hand-off, a mobile switching center determines if a forward control channel is transmitted from different sectors of base stations than a forward data channel is. The base stations preferably adjust transmit powers of the forward channels grouped into different physical channels by receiving power control data over the allocated reverse power control channels to compensate for fading of the forward channels during a soft hand-off.
    Type: Grant
    Filed: September 2, 1999
    Date of Patent: December 17, 2002
    Assignee: Lucent Technologies Inc.
    Inventors: Raafat Edward Kamel, Wen-Yi Kuo, Martin Howard Meyers, Carl Francis Weaver, Xiao Cheng Wu
  • Publication number: 20020132244
    Abstract: Methods for detecting low frequency nuclear mutations in a target sequence from a genomic DNA sequence are disclosed.
    Type: Application
    Filed: September 27, 2001
    Publication date: September 19, 2002
    Inventor: Xiao-Cheng Li-Sucholeiki
  • Patent number: 6421005
    Abstract: A system and method have been developed wherein a cylindrical antenna array is configured and reconfigured in a wireless communication network. Position and signal information are continuously received from wireless mobile units and are used to determine reconfigurations of antenna components of the cylindrical antenna array to enhance performance of the system. As such, base station antennas are dynamically configured to minimize such things as interference and dropped calls, and to maximize their voice quality both within a cell, and among neighboring cells.
    Type: Grant
    Filed: August 9, 2000
    Date of Patent: July 16, 2002
    Assignee: Lucent Technologies Inc.
    Inventors: Carl Francis Weaver, Xiao Cheng Wu
  • Patent number: 6400335
    Abstract: Antenna components of a cylindrical antenna array are adjusted, to dynamically share loads among sectors of a cell or between cells. The antenna components are adjusted based on beam configuration and/or orientation for example, depending upon a monitored load, to thereby vary antenna coverage areas to adjust for varying traffic densities. Antenna components are adjusted to accommodate load variations within a cell, and/or between cells.
    Type: Grant
    Filed: August 9, 2000
    Date of Patent: June 4, 2002
    Assignee: Lucent Technologies Inc.
    Inventors: Carl Francis Weaver, Xiao Cheng Wu
  • Patent number: 6285886
    Abstract: A power control method of the invention may be applied to downlink power control, uplink power control, or both to support different quality of service levels for multiple channels per a mobile station. The power control method transmits control data between a base station and a multi-channel mobile station on a single communications channel or sub-channel to minimize or reduce overhead traffic from the control data.
    Type: Grant
    Filed: July 8, 1999
    Date of Patent: September 4, 2001
    Assignee: Lucent Technologies Inc.
    Inventors: Raafat Edward Kamel, Wen-Yi Kuo, Martin Howard Meyers, Carl Francis Weaver, Xiao Cheng Wu
  • Patent number: 6285664
    Abstract: A method and system that minimizes pilot signal overlap and radio frequency (“RF”) interference by estimating changes in pilot coverage for different traffic channel loading and power conditions. Once base stations are positioned, a terminal for measuring received pilot signal strengths, such as a mobile station or pilot scanner, is used to collect and generate the baseline pilot survey data, which is then stored on a disk or tape. Base station transmit pilot EC/IOs, i.e., traffic channel loads on forward links, are also stored on disk or tape. The invention uses two adjustment factors associated with transmit power and traffic channel loading to optimize for different RF conditions, specifically for different base station transmit power or forward link loading conditions. For each RF condition, the methodology calculates the changes in the baseline pilot survey data. This reflects what EC/IOs a mobile station would receive under the given conditions.
    Type: Grant
    Filed: September 8, 1998
    Date of Patent: September 4, 2001
    Assignee: Lucent Technologies, Inc.
    Inventors: Neil E. Bernstein, Xiao Cheng Wu
  • Patent number: 6080012
    Abstract: An electrical connector having a retention mechanism for steadily securing the electrical connector to a mating circuit board comprises a dielectric housing, a number of contacts received in the housing and shield for enclosing the housing. The retention mechanism comprises a pair of lugs integrally and downwardly extending from the shield. Each lug includes an engaging means forming a pair of barbs thereon and a cutout defined between the pair of barbs for engaging within a corresponding positioning hole defined in the mating circuit board. Each lug has a length substantially equal to a thickness of the mating circuit board so that the retention mechanism will not scrape away solder coated on an inner surface of each positioning hole of the circuit board. Thus, excellent soldering connections between the electrical connector and the mating circuit board are established.
    Type: Grant
    Filed: August 11, 1999
    Date of Patent: June 27, 2000
    Assignee: Hon Hai Precision Ind. Co., Ltd.
    Inventors: Zi-Qiang Zhu, Xiao-Cheng Zhu, Shu-Ying Sheu