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    MULTIPLE SPREADING CODES IN SATELLITE COMMUNICATION SYSTEMS
    2.
    发明专利
    MULTIPLE SPREADING CODES IN SATELLITE COMMUNICATION SYSTEMS 未知

    公开(公告)号：CA2266720C

    公开(公告)日：2006-11-14

    申请号：CA2266720

    申请日：1998-04-28

    Applicant: MOTOROLA INC

    Inventor： HABER WILLIAM JOE ,  STARTUP JAMES WILLIAM

    IPC: H04B7/216 ,  H04B1/69 ,  H04B7/185 ,  H04L12/56

    Abstract: Signal routing from origination nodes (210) to destination nodes (250) in a spread spectrum communication system (100) is provided using spread spectrum routing codes. Origination nodes (210) and destination nodes (250) are identified using specific codes. Signal routes from origination nodes (210) to destination, nodes (250) are determined in terms of multi-level paths. Different codes are used to identify the different path levels. Data that is to be, sent to a particular user located at a destination node is first spread using the destination code for that destination node. This spread spectrum signal is spread a second ti me using a first level path code. In addition, the data can be spread a third time using a second-level path code. During the transmission of the spread data decoding processes are performed and the decoded data is routed based on the results of these decoding processes.

    Method for synchronous code division multiplexed communications
    4.
    发明专利
    Method for synchronous code division multiplexed communications 未知

    公开(公告)号：AU5108799A

    公开(公告)日：2000-02-07

    申请号：AU5108799

    申请日：1999-07-15

    Applicant: MOTOROLA INC

    Inventor： PETERS ROBERT ANTHONY ,  HOGBERG SHAWN WESLEY ,  EMMONS THOMAS PETER JR ,  STARTUP JAMES WILLIAM

    IPC: H04B7/26 ,  H04B7/216

    Abstract: In a code division multiplexed system, a subscriber unit (260, FIG. 1), which includes a pseudonoise code generator (70), is synchronized with the pseudonoise code generator (220) of a communications node (200). Synchronization between the pseudonoise code generators (70, 220) is achieved through measuring the time delay of a signal transmitted from the communications node (200) to the subscriber unit (260) and advancing the code generator of the subscriber unit in accordance with the time delay. This permits transmissions from the subscriber unit (260) to be received synchronously at the satellite. The synchronization is maintained through the periodic transmission from the communications node (200) to the subscriber unit (260) of a message which commands the subscriber unit (260) to adjust the timing of its pseudonoise code generator. The resulting synchronous code division multiplexed system offers increased capacity over conventional systems.

    Multiple spreading codes in satellite communication systems
    5.
    发明专利
    Multiple spreading codes in satellite communication systems 未知

    公开(公告)号：GB2332829A

    公开(公告)日：1999-06-30

    申请号：GB9905768

    申请日：1998-04-28

    Applicant: MOTOROLA INC

    Inventor： STARTUP JAMES WILLIAM ,  HABER WILLIAM JOE

    IPC: H04B7/216 ,  H04L12/56

    Abstract: Signal routing from origination nodes (210) to destination nodes (250) in a spread spectrum communication system (100) is provided using spread spectrum routing codes. Origination nodes (210) and destination nodes (250) are identified using specific codes. Signal routes from origination nodes (210) to destination nodes (250) are determined in terms of multi-level paths. Different codes are used to identify the different path levels. Data that is to be sent to a particular user located at a destination node is first spread using the destination code for that destination node. This spread spectrum signal is spread a second time using a first-level path code. In addition, the data can be spread a third time using a second-level path code. During the transmission of the spread data decoding processes are performed and the decoded data is routed based on the results of these decoding processes.

    MULTIPLE SPREADING CODES IN SATELLITE COMMUNICATION SYSTEMS
    6.
    发明专利
    MULTIPLE SPREADING CODES IN SATELLITE COMMUNICATION SYSTEMS 未知

    公开(公告)号：CA2266720A1

    公开(公告)日：1999-02-04

    申请号：CA2266720

    申请日：1998-04-28

    Applicant: MOTOROLA INC

    Inventor： STARTUP JAMES WILLIAM ,  HABER WILLIAM JOE

    IPC: H04B7/216 ,  H04L12/56 ,  H04B1/69 ,  H04B7/185

    Abstract: Signal routing from origination nodes (210) to destination nodes (250) in a spread spectrum communication system (100) is provided using spread spectrum routing codes. Origination nodes (210) and destination nodes (250) are identified using specific codes. Signal routes from origination nodes (210) to destination nodes (250) are determined in terms of multi-level paths. Different codes are used to identify the different path levels. Data that is to be sent to a particular user located at a destination node is first spread using the destination code for that destination node. This spread spectrum signal is spread a second time using a first-level path code. In addition, the data can be spread a third time using a second-level path code. During the transmission of the spread data decoding processes are performed and the decoded data is routed based on the results of these decoding processes.

    Phase domain multiplexed communications system
    8.
    发明专利
    Phase domain multiplexed communications system 未知

    公开(公告)号：AU5252199A

    公开(公告)日：2000-02-28

    申请号：AU5252199

    申请日：1999-08-03

    Applicant: MOTOROLA INC

    Inventor： STARTUP JAMES WILLIAM ,  HUTCHINS RUBY FIGOR

    IPC: H04J11/00 ,  H04B7/12 ,  H04L1/04 ,  H04L5/02 ,  H04B1/69

    Abstract: A phase domain multiplexed communication system generates N carrier frequencies each with a unique phase according to a selected orthogonal vector containing N elements. A subscriber information signal is first divided through a signal divider (215, FIG. 6). Each divided signal is then upconverted through a mixer (220) and phase shifted according to the selected orthogonal vector. The resulting signal is then combined through a summing element (250) and transmitted. At a receiver, the incoming signal is coupled to a signal divider (315, FIG. 7) where the signal is divided into N signal components. Each signal component is downconverted and phase shifted so that the transmitted subscriber information can be extracted at a summing element (350). At the summing element (350) the desired subscriber signal components add in-phase while the signal components corresponding to other subscribers add out-of-phase.

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