Patents by Inventor Karl Steadman

Karl Steadman 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: 8018840
    Abstract: Described are an apparatus and method for routing packets through a multiple-hop wireless communications network. Interference with packet switched communications carried by radio frequency (RF) over the multiple-hop wireless communications network is detected. In response to information related to the detected interference, a route is adaptively determined for transmitting packets through the multiple-hop wireless communications network that mitigates the effect of the interference on the packets.
    Type: Grant
    Filed: August 3, 2007
    Date of Patent: September 13, 2011
    Assignee: SRI International
    Inventors: Barghav R. Bellur, Richard G. Ogier, Ambatipudi R. Sastry, Karl Steadman, John Waterston
  • Publication number: 20090047920
    Abstract: A method for classifying a signal is disclosed. The method can be used by a station or stations within a network to classify the signal as non-cooperative (NC) or a target signal. The method performs classification over channels within a frequency spectrum. The percentage of power above a first threshold is computed for a channel. Based on the percentage, a signal is classified as a narrowband signal. If the percentage indicates the absence of a narrowband signal, then a lower second threshold is applied to confirm the absence according to the percentage of power above the second threshold. The signal is classified as a narrowband signal or pre-classified as a wideband signal based on the percentage. Pre-classified wideband signals are classified as a wideband NC signal or target signal using spectrum masks.
    Type: Application
    Filed: August 15, 2007
    Publication date: February 19, 2009
    Applicant: SHARED SPECTRUM COMPANY
    Inventors: Eugene LIVSICS, Mark A. McHenry, Dmitry Dain, Karl Steadman, Olga Ritterbush
  • Publication number: 20080095042
    Abstract: Methods for using a detector to monitor and detect channel occupancy are disclosed. The detector resides on a station within a network using a framed format having a periodic time structure. When non-cooperative transmissions are detected by the network, the detector assesses the availability of a backup channel enabling migration of the network. The backup channel serves to allow the network to migrate transparently when the current channel becomes unavailable. The backup channel, however, could be occupied by another network that results in the migrating network interfering with the network already using the backup channel. Thus, the detector detects active transmission sources on the backup channel to determine whether the backup channel is occupied. Methods for using the detector include scheduling detection intervals asynchronously. The asynchronous detection uses offsets from a reference point within a frame.
    Type: Application
    Filed: October 18, 2006
    Publication date: April 24, 2008
    Inventors: Mark A. McHenry, Dmitry Dain, Jevgenijs Livsics, Karl Steadman, Olga Ritterbush
  • Patent number: 7342876
    Abstract: Described are an apparatus and method for routing packets through a multiple-hop wireless communications network. Interference with packet switched communications carried by radio frequency (RF) over the multiple-hop wireless communications network is detected. In response to information related to the detected interference, a route is adaptively determined for transmitting packets through the multiple-hop wireless communications network that mitigates the effect of the interference on the packets.
    Type: Grant
    Filed: December 20, 2001
    Date of Patent: March 11, 2008
    Assignee: SRI International
    Inventors: Barghav R. Bellur, Richard G. Ogier, Ambatipudi R. Sastry, Karl Steadman, John Waterston
  • Publication number: 20070268880
    Abstract: Described are an apparatus and method for routing packets through a multiple-hop wireless communications network. Interference with packet switched communications carried by radio frequency (RF) over the multiple-hop wireless communications network is detected. In response to information related to the detected interference, a route is adaptively determined for transmitting packets through the multiple-hop wireless communications network that mitigates the effect of the interference on the packets.
    Type: Application
    Filed: August 3, 2007
    Publication date: November 22, 2007
    Inventors: Barghav Bellur, Richard Ogier, Ambatipudi Sastry, Karl Steadman, John Waterston
  • Publication number: 20030119558
    Abstract: Described are an apparatus and method of adaptively controlling an antenna pattern of a wireless communications device in a packet-switched wireless communications network. An electromagnetic signal is received over the packet-switched wireless communications network by a wireless communication device having a receive antenna pattern. The electromagnetic signal is determined to be from an intended or unintended source. The receive antenna pattern is adapted if the electromagnetic signal is from an unintended source.
    Type: Application
    Filed: December 20, 2001
    Publication date: June 26, 2003
    Inventors: Karl Steadman, John Waterston
  • Publication number: 20030120809
    Abstract: Described are an apparatus and method for routing packets through a multiple-hop wireless communications network. Interference with packet switched communications carried by radio frequency (RF) over the multiple-hop wireless communications network is detected. In response to information related to the detected interference, a route is adaptively determined for transmitting packets through the multiple-hop wireless communications network that mitigates the effect of the interference on the packets.
    Type: Application
    Filed: December 20, 2001
    Publication date: June 26, 2003
    Inventors: Barghav R. Bellur, Richard G. Ogier, Ambatipudi R. Sastry, Karl Steadman, John Waterston