Selective call receiver with fast bit synchronizer

Details Selective call receiver with fast bit synchronizer Selective call receiver with fast bit synchronizer

1991-10-31

1993-04-27

Kuntz, Curtis

Pulse or digital communications

Repeaters

Testing

375 94, 375111, 328109, H03D 100, H04L 704

Patent

active

052068854

ABSTRACT:
A selective call receiver comprises a receiver for receiving a signal and a digital synchronizer coupled to the receiver. The digital synchronizer examines the signal transmitted at a predetermined baud rate for a predetermined time. Upon completion of the predetermined time, a decision is made as to whether or not the signal included the predetermined baud rate. If the signal includes the predetermined baud rate, a bit clock is established indicative of the boundaries and center of each baud symbol. The synchronizer samples the signal at a multiple of the baud rate and accumulates the phase relationship between the samples and transitions of the signal during the predetermined time. Upon conclusion of the predetermined time, the distribution of the phase relationships is examined and the presence or absence of signal is determined. If the presence is determined, the bit clock is established.

REFERENCES:
patent: 4029905 (1977-06-01), Abraham
patent: 4146743 (1979-03-01), Raynham
patent: 4414676 (1983-11-01), Kraul et al.
patent: 4456884 (1984-06-01), Yarborough
patent: 4653073 (1987-03-01), Vercellotti et al.
patent: 4837854 (1989-06-01), Oyagi et al.
patent: 4928086 (1990-05-01), Drapac et al.
patent: 5095498 (1992-03-01), Deluca et al.

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