Patents by Inventor Qiang Shen

Qiang Shen 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: 6463043
    Abstract: Methods and apparatus for performing complex channel gain estimation from a transformer output and a non-coherent combiner output include a selector, an envelope detector, a weighting unit, a controller, store units, and an averager. The device may perform coherent complex channel gain estimation on link signals for signals transmitted by IS-95 burst randomization, and may operate on a power control group.
    Type: Grant
    Filed: November 25, 1998
    Date of Patent: October 8, 2002
    Assignee: Nortel Networks Limited
    Inventors: Qiang Shen, Peter Savinsky, Rui Wang, Wen Tong, Dmitry Menyailov, Dmitry Pogorilko, Alexander Garmonov
  • Publication number: 20020101832
    Abstract: A method and system for closed loop power control in a wireless communication network. A received signal is despread. The signal power of the despread received signal is estimated. The noise power of the despread received signal is estimated. Estimating the noise power includes multiplying the despread received signal with an orthogonal noise code to cancel the received signal, accumulating the multiplied despread received signal over one frame and determining a signal-to-noise ratio of the received signal at least in part by dividing the estimated signal power by the estimated noise power. A reverse power control bit is determined based on the determined signal-to-noise ratio.
    Type: Application
    Filed: January 30, 2001
    Publication date: August 1, 2002
    Inventors: Xixan Chen, Neil N. Mcgowan, Weigang Li, Jeffrey D. Stanier, M. K. Islam, Qiang Shen, Xin Jin
  • Patent number: 5939299
    Abstract: An enzyme preparation that exhibits cephalosporin chloroperoxidase activity is isolatable from a microorganism species of the Rathayibacter genus. This enzyme preparation can convert cephalexin to cefaclor in a single step. A particular, unique microorganism that can provide the cephalosporin chloroperoxidase enzyme preparation is Rathayibacter biopuresis.
    Type: Grant
    Filed: June 26, 1997
    Date of Patent: August 17, 1999
    Assignee: Biopure Corporation
    Inventors: Bing L. Wong, Yong-Qiang Shen, Yung-Pin Chen
  • Patent number: 5854054
    Abstract: An enzyme preparation that exhibits cephalosporin haloperoxidase activity is isolatable from a microorganism species of the Rathayibacter genus. This enzyme preparation can convert cephalexin to a halogenated cephalosporin antibiotic in a single step. A particular, unique microorganism that can provide the cephalosporin haloperoxidase enzyme preparation is Rathayibacter biopuresis.
    Type: Grant
    Filed: December 30, 1996
    Date of Patent: December 29, 1998
    Assignee: Biopure Corporation
    Inventors: Bing L. Wong, Yong-Qiang Shen, Yung-Pin Chen
  • Patent number: 5695951
    Abstract: An enzyme preparation that exhibits cephalosporin chloroperoxidase activity is isolatable from a microorganism species of the Rathayibacter genus. This enzyme preparation can convert cephalexin to cefaclor in a single step. A particular, unique microorganism that can provide the cephalosporin chloroperoxidase enzyme preparation is Rathayibacter biopuresis.
    Type: Grant
    Filed: December 20, 1994
    Date of Patent: December 9, 1997
    Assignee: Biopure Corporation
    Inventors: Bing L. Wong, Yong-Qiang Shen, Yung-Pin Chen
  • Patent number: 5589354
    Abstract: An enzyme preparation that exhibits cephalosporin haloperoxidase activity is isolatable from a microorganism species of the Rathayibacter genus. This enzyme preparation can convert cephalexin to a halogenated cephalosporin antibiotic in a single step. A particular, unique microorganism that can provide the cephalosporin haloperoxidase enzyme preparation is Rathayibacter biopuresis.
    Type: Grant
    Filed: December 20, 1994
    Date of Patent: December 31, 1996
    Assignee: Biopure Corporation
    Inventors: Bing L. Wong, Yong-Qiang Shen, Yung-Pin Chen