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.

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.

公开(公告)号：BE726821A

公开(公告)日：1969-06-16

申请号：BE726821

申请日：1969-01-13

Applicant: IBM

Inventor： NUSSBAUMER HENRI ,  PIERRET JEAN MARC ,  LAUTIER ALEX

IPC: H03D

公开(公告)号：CA1121075A

公开(公告)日：1982-03-30

申请号：CA334090

申请日：1979-08-20

Applicant: IBM

Inventor： LAUTIER ALEX ,  MONROLIN JEAN L

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

Abstract: METHOD AND SYSTEM FOR SYNCHRONIZING A TDMA COMMUNICATION NETWORK COMPRISING A SATELLITE EQUIPPED WITH SEVERAL DIRECTIONAL BEAM ANTENNAS TRANSMITTING SIGNALS AT VARIOUS FREQUENCIES 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. FR9-78-005

公开(公告)号：CA984472A

公开(公告)日：1976-02-24

申请号：CA167865

申请日：1973-03-28

Applicant: IBM

Inventor： LAUTIER ALEX ,  MADDENS FRANCIS P ,  NUSSBAUMER HENRI J ,  PIERRET JEAN M

IPC: H04B3/06 ,  H03H17/00 ,  H03H17/08 ,  H04L27/01

Abstract: A self-adjustable equalizer for a phase modulation communication system in which the equalizer output signal s is sampled at the modulation rate and weighted by a factor proportional to envelope amplitude distortion dR/R, R being the envelope amplitude at given instants and the product sdR/R being the adjustment control signal. In the preferred embodiment the product of the sign of s and the sign of dR serves as the control or error signal. One implementation frequency translates the equalizer output signal and compares the amplitude of the translated signal with a reference at given instants to determine the sign of dR which is eventually multiplied by the sign of s.

公开(公告)号：FR2394218A1

公开(公告)日：1979-01-05

申请号：FR7718762

申请日：1977-06-10

Applicant: IBM FRANCE

Inventor： LAUTIER ALEX ,  MONROLIN JEAN

IPC: H04L27/22 ,  H04L27/227

公开(公告)号：DE2317597A1

公开(公告)日：1973-11-15

申请号：DE2317597

申请日：1973-04-07

Applicant: IBM

Inventor： LAUTIER ALEX ,  MADDENS FRANCIS PAUL ,  NUSSBAUMER HENRI JEAN ,  PIERRET JEAN MARC

IPC: H04B3/06 ,  H03H17/00 ,  H03H17/08 ,  H04L27/01 ,  H04L27/22

Abstract: A self-adjustable equalizer for a phase modulation communication system in which the equalizer output signal s is sampled at the modulation rate and weighted by a factor proportional to envelope amplitude distortion dR/R, R being the envelope amplitude at given instants and the product sdR/R being the adjustment control signal. In the preferred embodiment the product of the sign of s and the sign of dR serves as the control or error signal. One implementation frequency translates the equalizer output signal and compares the amplitude of the translated signal with a reference at given instants to determine the sign of dR which is eventually multiplied by the sign of s.