Patents by Inventor Z. K. Cheng

Z. K. 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).

  • Microcell frequency planning
    Patent number: 5822698
    Abstract: The system is comprised of a microcellular underlay to increase the coverage of a macrocellular overlay system. The frequencies are assigned to the microcells by interleaved frequency segregation. Channels are selected from the macrocell frequency groups based on a minimum channel separation from the other channels in the microcell frequency group. The channels in the microcell frequency group that are greater than a minimum channel separation from the channels in the macrocell sector i overlay are assigned to the microcell sector i.
    Type: Grant
    Filed: August 8, 1996
    Date of Patent: October 13, 1998
    Assignee: Northern Telecom Limited
    Inventors: Yuqiang Tang, Z. K. Cheng, Man-Fai Ng