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    METHOD AND SYSTEM FOR SYNCHRONISING A TIME DIVISION MULTIPLE ACCESS COMMUNICATION NETWORK USING A SATELLITE HAVING MULTIPLE SPOT BEAM ANTENNAS AT DIFFERENT FREQUENCIES
    1.
    发明专利
    METHOD AND SYSTEM FOR SYNCHRONISING A TIME DIVISION MULTIPLE ACCESS COMMUNICATION NETWORK USING A SATELLITE HAVING MULTIPLE SPOT BEAM ANTENNAS AT DIFFERENT FREQUENCIES 未知

    公开(公告)号：DE2964714D1

    公开(公告)日：1983-03-17

    申请号：DE2964714

    申请日：1979-07-25

    Applicant: IBM

    Inventor： LAUTIER ALEX ,  MONROLIN JEAN-LOUIS

    IPC: H04J4/00 ,  H04B7/15 ,  H04B7/204 ,  H04B7/212 ,  H04J3/06 ,  H04J3/24 ,  H04L7/00 ,  H04L7/10 ,  H04B7/185

    Abstract: A method and a system are disclosed for synchronizing within a recurrent time frame the starting points of the transmissions from the various stations in a TDMA network wherein N stations distributed among M separate zones covered by M different down-link frequencies exchange pulse bursts through a satellite, each pulse burst being comprised of a preamble, a unique word, the transmitting station's address, and traffic data. The satellite includes a global beam antenna which covers all of the M zones and is adapted to receive M different up-link frequencies, means for converting these M up-link frequencies to M corresponding down-link frequencies, and M directional beam antennas covering the M zones, each of said M antennas being adapted to transmit the down-link frequency associated with the particular zone it covers. The bursts transmitted by the various stations are assigned a predetermined position within the frame. Each station detects whether it has received a unique word followed by the address of a given station. Upon detecting such an address, the station activates timing means which define a time interval associated with the station whose address has been detected and, at the end of that time interval, starts transmitting M successive bursts respectively destined for the M zones during predetermined time intervals within the frame. These M bursts are transmitted at different up-link frequencies so that the burst intended for a given zone will be transmitted at the up-link frequency corresponding to the down-link frequency for that zone. In accordance with an embodiment of the invention, the timing means comprise M timers respectively defining N time intervals associated with the N stations. The start of a station's transmission is determined by the timer which reaches its stopping point first.

    4.
    发明专利
    未知

    公开(公告)号：FR2436535A1

    公开(公告)日：1980-04-11

    申请号：FR7827024

    申请日：1978-09-15

    Applicant: IBM FRANCE

    Inventor： LAUTIER ALEX ,  MONROLIN JEAN-LOUIS

    IPC: H04J4/00 ,  H04B7/15 ,  H04B7/204 ,  H04B7/212 ,  H04J3/06 ,  H04J3/24 ,  H04L7/00 ,  H04L7/10 ,  H04B7/19 ,  H04J15/00

    Abstract: A method and a system are disclosed for synchronizing within a recurrent time frame the starting points of the transmissions from the various stations in a TDMA network wherein N stations distributed among M separate zones covered by M different down-link frequencies exchange pulse bursts through a satellite, each pulse burst being comprised of a preamble, a unique word, the transmitting station's address, and traffic data. The satellite includes a global beam antenna which covers all of the M zones and is adapted to receive M different up-link frequencies, means for converting these M up-link frequencies to M corresponding down-link frequencies, and M directional beam antennas covering the M zones, each of said M antennas being adapted to transmit the down-link frequency associated with the particular zone it covers. The bursts transmitted by the various stations are assigned a predetermined position within the frame. Each station detects whether it has received a unique word followed by the address of a given station. Upon detecting such an address, the station activates timing means which define a time interval associated with the station whose address has been detected and, at the end of that time interval, starts transmitting M successive bursts respectively destined for the M zones during predetermined time intervals within the frame. These M bursts are transmitted at different up-link frequencies so that the burst intended for a given zone will be transmitted at the up-link frequency corresponding to the down-link frequency for that zone. In accordance with an embodiment of the invention, the timing means comprise M timers respectively defining N time intervals associated with the N stations. The start of a station's transmission is determined by the timer which reaches its stopping point first.

    5.
    发明专利
    未知

    公开(公告)号：DE2420831A1

    公开(公告)日：1974-11-28

    申请号：DE2420831

    申请日：1974-04-30

    Applicant: IBM

    Inventor： MONROLIN JEAN-LOUIS

    IPC: H03H17/08 ,  H04L7/033 ,  H03H7/00 ,  H04B1/66 ,  H04L27/22 ,  H04L25/04

    Abstract: A combination purely recursive digital filter and a resolver is disclosed in which the phase relationship between an extracted signal and a reference phase is measured and used to eliminate the phase error so determined.

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