Patents by Inventor Daniel M. Devasirvathan

Daniel M. Devasirvathan 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).

  • Beacon detection method and apparatus for sharing spectrum between wireless communications systems and fixed microwave systems
    Patent number: 5412658
    Abstract: A system for spectrum sharing between a point-to-point microwave system and a TDM/TDMA wireless communications system in a common geographical area is described. Each transmitter/receiver in the point-to-point microwave system transmits, in addition to its normal information signal, a beacon signal which is uniquely associated with the receiver receive frequency. In selecting uplink and downlink frequencies for port assignment, each port monitors the beacon frequencies and selects as uplink and downlink frequencies, frequencies which associated beacons fall below a predetermined threshold. Similarly, before accessing the wireless communications system through a selected port, a portable monitors the beacons associated with the selected port's uplink frequency. If the beacon associated with the uplink frequency exceeds a threshold, the portable selects an alternate port through which to access the network.
    Type: Grant
    Filed: October 22, 1993
    Date of Patent: May 2, 1995
    Assignee: Bell Communications Research, Inc.
    Inventors: Hamilton W. Arnold, Daniel M. Devasirvathan, Nelson R. Sollenberger, Larrie G. Sutliff, Vijay K. Varma
  • Beacon detection system for sharing spectrum between wireless communications systems and fixed microwave systems
    Patent number: 5361258
    Abstract: A system for spectrum sharing between a point-to-point microwave system and a TDM/TDMA wireless communications system in a common geographical area is described. Each transmitter/receiver in the point-to-point microwave system transmits, in addition to its normal information signal, a beacon signal which is uniquely associated with the receiver receive frequency. In selecting uplink and downlink frequencies for port assignment, each port monitors the beacon frequencies and selects as uplink and downlink frequencies, frequencies which associated beacons fall below a predetermined threshold. Similarly, before accessing the wireless communications system through a selected port, a portable monitors the beacons associated with the selected port's uplink frequency. If the beacon associated with the uplink frequency exceeds a threshold, the portable selects an alternate port through which to access the network.
    Type: Grant
    Filed: October 22, 1993
    Date of Patent: November 1, 1994
    Assignee: Bell Communications Research, Inc.
    Inventors: Hamilton W. Arnold, Daniel M. Devasirvathan, Nelson R. Sollenberger, Larrie G. Sutliff, Vijay K. Varma