Patents Assigned to Celsat America, Inc.
  • Patent number: 6449461
    Abstract: A mobile communications system for permitting the communications of a mobile unit in proximity to a communications service having priority over the communications of the mobile unit. An interference zone is formed around the priority communications site such that if the mobile unit were to transmit in the frequency band of the priority system, interference would be created with the operation of the priority receiver. In order to eliminate interference with the priority system by the mobile unit, a proximity detector determines if the mobile unit is located in the interference zone. Once the determination has been made that the mobile unit is located in the interference zone, the mobile unit alters its transmission to eliminate the interference of the mobile unit with the priority service.
    Type: Grant
    Filed: July 15, 1996
    Date of Patent: September 10, 2002
    Assignee: Celsat America, Inc.
    Inventor: David De Sales Otten
  • Patent number: 6108561
    Abstract: A cellular communications system is provided having both surface and satellite nodes which are fully integrated for providing service over large areas. Two-way adaptive power control and signal quality monitoring and power control responsive thereto are provided for controlling the power output levels of transmitters to the minimum necessary for satisfactory communications. Each transmission includes a code representative of the transmitter output power level. Receivers compare this code to the received signal strength and adjust their associated transmitter power output level accordingly. Bit error rate and SNR are monitored by receivers to develop a measure of signal quality. A signal quality code is transmitted to remote units and transmission output power level is adjusted in response. Timing signals are provided by one or more nodes to obtain user position information.
    Type: Grant
    Filed: March 1, 1999
    Date of Patent: August 22, 2000
    Assignee: Celsat America, Inc.
    Inventor: Albert Jack Mallinckrodt
  • Patent number: 5995832
    Abstract: A cellular communications system is provided have both satellite nodes and surface nodes for providing mobile cellular communications services for a plurality of mobile user units. The surface and satellite nodes are fully integrated by a network controller for providing service over large areas. In the alternative, each user unit includes link control means permitting the user unit to designate the mode of communications, either satellite node communications or ground node communications. In addition, multiple beam, relatively high gain antennas are disposed in the satellite nodes to establish satellite cells having enough gain in the satellite part of the system such that a user unit need only comprise a small, mobile handset with a non-directional antenna for communications with both ground nodes and satellite nodes.
    Type: Grant
    Filed: October 28, 1998
    Date of Patent: November 30, 1999
    Assignee: Celsat America, Inc.
    Inventor: Albert J. Mallinckrodt
  • Patent number: 5940753
    Abstract: A cellular communications system is provided have both satellite nodes and surface nodes for providing mobile cellular communications services for a plurality of mobile user units. The surface and satellite nodes are fully integrated by a network controller for providing service over large areas. Multiple beam, relatively high gain antennas are disposed in the satellite nodes to establish satellite cells having enough gain in the satellite part of the system such that a user unit need only comprise a small, mobile handset with a non-directional antenna for communications with both ground nodes and satellite nodes.
    Type: Grant
    Filed: October 6, 1997
    Date of Patent: August 17, 1999
    Assignee: Celsat America, Inc.
    Inventor: Albert J. Mallinckrodt
  • Patent number: 5878329
    Abstract: A cellular communications system is provided having both surface and satellite nodes which are fully integrated for providing service over large areas. Two-way adaptive power control and signal quality monitoring and power control responsive thereto are provided for controlling the power output levels of transmitters to the minimum necessary for satisfactory communications. Each transmission includes a code representative of the transmitter output power level. Receivers compare this code to the received signal strength and adjust their associated transmitter power output level accordingly. Bit error rate and SNR are monitored by receivers to develop a measure of signal quality. A signal quality code is transmitted to remote units and transmission output power level is adjusted in response. Timing signals are provided by one or more nodes to obtain user position information.
    Type: Grant
    Filed: January 8, 1997
    Date of Patent: March 2, 1999
    Assignee: Celsat America, Inc.
    Inventor: Albert Jack Mallinckrodt
  • Patent number: 5835857
    Abstract: Methods for operating a wireless communications system provided for reducing the use of the system by unauthorized users by establishing the geographical location of selected user, comparing this location with the known locations of authorized users and denying service to the selected user if the selected user's location does not correspond to the known location of authorized users. Seamless hand-over of a user between nodes of the communication system is effected by periodically recomputing a algorithm which determines a preferred node for communication with the user. When the algorithm indicates that another node is preferred, a call initiation handshake is established between the user and the preferred node, while still maintaining communication with the original node. Communication between the user and the first node is not interrupted until the user establishes a communication "lock" with the second node.
    Type: Grant
    Filed: November 18, 1996
    Date of Patent: November 10, 1998
    Assignee: Celsat America, Inc.
    Inventor: David D. Otten
  • Patent number: 5832379
    Abstract: A cellular communications system is provided have both satellite nodes and surface nodes for providing mobile cellular communications services for a plurality of mobile user units. The surface and satellite nodes are fully integrated by a network controller for providing service over large areas. In the alternative, each user unit includes link control means permitting the user unit to designate the mode of communications, either satellite node communications or ground node communications. In addition, multiple beam, relatively high gain antennas are disposed in the satellite nodes to establish satellite cells having enough gain in the satellite part of the system such that a user unit need only comprise a small, mobile handset with a non-directional antenna for communications with both ground nodes and satellite nodes.
    Type: Grant
    Filed: October 6, 1997
    Date of Patent: November 3, 1998
    Assignee: Celsat America, Inc.
    Inventor: Albert J. Mallinckrodt
  • Patent number: 5612703
    Abstract: A cellular communications system is provided having both surface and satellite nodes which are fully integrated for providing service over large areas. Position means are included for determining the position of a selected user unit within the cells by providing a timing signal to the selected user unit from at least one node, providing a timing response signal from the selected user unit in response to each timing signal, receiving the timing response signal by at least one node, measuring the response time of the user unit to the timing signal based on receipt of the timing response signal, and determining the position of the user unit based on the round trip time of transmission of the timing signal and receipt of the timing response signal. Preferably, the invention provides position determination in a cellular communications system using code division multiple access (CDMA) employing forward error correction coding (FECC) and spread spectrum waveforms.
    Type: Grant
    Filed: May 19, 1995
    Date of Patent: March 18, 1997
    Assignee: Celsat America, Inc.
    Inventor: Albert J. Mallinckrodt
  • Patent number: 5511233
    Abstract: A mobile communications system provides communications with mobile users in the interference zones of communications services having priority of use of the frequency band in which the mobile user operates. The frequency band has been previously allocated for use by the other services, such as fixed microwave service (FMS); however, by means of the invention, the mobile user is able to conduct communications operations on a subband or subbands in that frequency band. A position locating system determines the position of the mobile user and if the user is within an interference zone, the mobile user is assigned subbands for operation in the previously allocated frequency band that are outside the subbands of operation of the FMS. A memory accessible by the processor selecting the frequency band of operation of the mobile user includes descriptions of the transmit and receive interference zones of each FMS.
    Type: Grant
    Filed: April 5, 1994
    Date of Patent: April 23, 1996
    Assignee: Celsat America, Inc.
    Inventor: David D. Otten
  • Patent number: 5446756
    Abstract: A cellular communications system is provided having both surface and satellite nodes which are fully integrated for providing service over large areas. A spread spectrum system is used with code division multiple access (CDMA) employing forward error correction coding (FECC) to enhance the effective gain and selectivity of the system. Two-way adaptive power control and signal quality monitoring and power control responsive thereto are provided for controlling the power output levels of transmitters to the minimum necessary for satisfactory communications. Each transmission includes a code representative of the transmitter output power level. Receivers compare this code to the received signal strength and adjust their associated transmitter power output level accordingly. Bit error rate and SNR are monitored by receivers to develop a measure of signal quality. A signal quality code is transmitted to remote units and transmission output power level is adjusted in response.
    Type: Grant
    Filed: October 28, 1993
    Date of Patent: August 29, 1995
    Assignee: Celsat America, Inc.
    Inventor: Albert J. Mallinckrodt