公开(公告)号：US3571717A

公开(公告)日：1971-03-23

申请号：US3571717D

申请日：1968-10-01

Applicant: IBM

Inventor： MONROLIN JEAN L

IPC: H03D1/22 ,  H04L27/06 ,  H04B1/68

CPC classification number: H04L27/066 ,  H03D1/22

Abstract: In a communication system transmitting both the lower sideband of a modulated signal and the carrier, the phase shift of the recovered carrier relative to the signal spectrum can be adjusted to improve signal demodulation. Two pilot frequencies, one higher than and one lower than the signal frequencies to be transmitted and having a known phase relationship are mixed with the signal for modulation by the carrier and transmission. In the receiver, the signal is demodulated with a recovered carrier signal and the pilot frequencies are phase compared to determine the magnitude and direction of their relative phase shift. The recovered carrier signal is then phase shifted to reduce the relative phase shift of the pilot frequencies to within a limited range.

公开(公告)号：CA1141492A

公开(公告)日：1983-02-15

申请号：CA335354

申请日：1979-09-10

Applicant: IBM

Inventor： MONROLIN JEAN L ,  VACHEE PIERRE

IPC: H03M5/16 ,  H04J9/00 ,  H04J99/00 ,  H04L5/02 ,  H04L25/30 ,  H04L25/49 ,  H04J3/00 ,  H03K13/00

Abstract: A process for transmitting binary sequences of data using a ternary coded signal. Several trains of binary signals are time multiplexed by a group of registers to generate a first binary sequence which is applied to an encoding unit. The encoding unit also receives a second binary sequence and clocking information. When the time-multiplexed sequence of binary signals is at one binary level the encoding unit codes the combined signal in a bipolar mode. When the time-multiplexed sequence of binary signals is at a second binary level, the resulting signal is coded in the biphase mode. FR9-78-001

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：CA1016609A

公开(公告)日：1977-08-30

申请号：CA198957

申请日：1974-04-30

Applicant: IBM

Inventor： MONROLIN JEAN L

IPC: H03H17/08 ,  H04L7/033

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.

公开(公告)号：CA1092656A

公开(公告)日：1980-12-30

申请号：CA300379

申请日：1978-04-04

Applicant: IBM

Inventor： LAUTIER ALEX H ,  MONROLIN JEAN L

IPC: H04L27/22 ,  H04L27/227 ,  H04B1/16 ,  H04B1/26

Abstract: RECEIVER FOR DATA TRANSMITTED BY MEANS OF THE INTERLEAVED BINARY PHASE SHIFT KEYED MODULATION TECHNIQUE A receiver in which the received signal is demodulated by means of an in-phase reference carrier and a quadrature reference carrier both of which are supplied by a clock and carrier recovery device, thereby supplying the in-phase and quadrature components of the signal. The sign of the sum of these components and that of the difference between them are selectively gated to the output of the receiver under control of the clock signal supplied by the clock and carrier recovery device. In this device, the frequency of the received signal is doubled and the signal thus obtained is modulated by the clock signal at half the signaling rate extracted from the received signal. This modulation operation yields a signal at twice the carrier frequency from which the in-phase and quadrature reference carriers are extracted.

公开(公告)号：CA976250A

公开(公告)日：1975-10-14

申请号：CA142061

申请日：1972-05-10

Applicant: IBM

Inventor： MONROLIN JEAN L ,  FROMENT JEAN C

IPC: H03H19/00

Abstract: An N path filter where signals are applied to two orthogonal input paths and where the modulated and filtered signals from the input paths are combined and applied to each of the N equiphase output paths, the signals on each output path being suitably modulated, the filter output signal being formed from the algebraic sum of the modulated N output path signals. A pulse approximation to sinusoidal modulating signals is also disclosed.

公开(公告)号：CA1085003A

公开(公告)日：1980-09-02

申请号：CA287435

申请日：1977-09-26

Applicant: IBM

Inventor： MONROLIN JEAN L

IPC: H03L7/06 ,  H04B7/155 ,  H04L27/00 ,  H04L27/227 ,  H04L27/22

Abstract: CARRIER SYNCHRONIZATION SYSTEM FOR COHERENT PHASE DEMODULATORS A carrier synchronization system for a four-phase coherent PSK demodulator in which the four-phase PSK signal is demodulated by an in-phase reference carrier and a quadrature reference carrier both of which are locally generated by a reference carrier source. The in-phase and quadrature components of the four-phase PSK signal that result from these demodulation operations are delayed a time interval substantially equal to T/2 seconds, T being the signalling period. The product of the delayed in-phase component by the sign of the quadrature component is subtracted from the product of the delayed quadrature component by the sign of the in-phase component to provide a phase error signal. This error signal controls the adjustment of the reference carrier source.

公开(公告)号：CA994871A

公开(公告)日：1976-08-10

申请号：CA160727

申请日：1973-01-08

Applicant: IBM

Inventor： MONROLIN JEAN L ,  PIERRET JEAN M

IPC: H03H7/01 ,  H03H15/00 ,  H04B3/06 ,  H04L27/01