Pulse or digital communications – Synchronizers – Frequency or phase control using synchronizing signal
Patent
1995-07-19
1998-04-07
Chin, Stephen
Pulse or digital communications
Synchronizers
Frequency or phase control using synchronizing signal
375200, 327156, H04L 700
Patent
active
057373728
ABSTRACT:
In a spread spectrum multipoint-to-point communication system there is provided a novel frequency to phase converter, for automatically synchronizing the PN codes of the user transmitters/receiver with the receiver/transmitter in the central hub. The highly accurate frequency to phase converter generates a highly accurate phase error signal for synchronizing the multiuser network. The frequency to phase converter includes a serial adder and a series to parallel converter and a shift register which integrates the highly accurate phase error signal values and produces a highly accurate frequency value which is applied to the input of the resident processor in the central hub transmitter/receiver. The central hub transmitter/receiver calculates the clock offset for synchronizing each of the user receiver transmitters and generates a clock adjusting signal which is transmitted to the user receiver/transmitters.
REFERENCES:
patent: 4110557 (1978-08-01), Huber
patent: 4879674 (1989-11-01), Iijima et al.
patent: 5060180 (1991-10-01), Kingston et al.
patent: 5103459 (1992-04-01), Gilhousen et al.
patent: 5111478 (1992-05-01), McDonald
Barham Steven Todd
Kingston Samuel Charles
Zscheile, Jr. John Walter
Chin Stephen
Samuels, Esq. Steven B.
Sowell. Esq. John B.
Starr, Esq. Mark T.
Unisys Corporation
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