Patents by Inventor Derald O. Johnson, Jr.

Derald O. Johnson, Jr. 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).

  • Signal acquisition in a wireless communication system by transmitting repeated access probes from a terminal to a hub
    Patent number: 5907813
    Abstract: A novel and improved method and apparatus for signal acquisition in a wireless telecommunication system having large transmission delay uncertainty is described. A terminal first acquires the forward link signal from a hub and extracts timing information from that forward link signal. Using the timing information the terminal estimates the time at which a next search window takes place during an access slot, and the time and pseudorandom code state necessary to transmit an access probe so as to arrive at during the search window assuming the terminal is located a maximum distance from the hub. The terminal proceeds to transmit additional access probes at times occurring one access slot period plus a delta time interval after the previous transmission. The delta time interval has a duration less than that of a search window associated with each access slot.
    Type: Grant
    Filed: November 30, 1995
    Date of Patent: May 25, 1999
    Assignee: QUALCOMM Incorporated
    Inventors: Derald O. Johnson, Jr., Paul T. Williamson, James A. Hutchison, IV, Gwain Bayley