Synchronization of digital radio pager

Communications: electrical – Continuously variable indicating – With meter reading

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Details

375114, H04Q 900, H04B 116

Patent

active

045062625

ABSTRACT:
A method of synchronizing a digital radio pager receiver with incoming digital data signals. At switch-on the receiver first attains a "course" bit synch during the first quarter-word period and then a "fine" bit synch during the next half-word period. The receiver then examines incoming data bits to determine simultaneously (a) whether valid data is being received and (b) whether the incoming data contains a preamble sequence. If either determination is successful the incoming data is then examined to determine whether it contains a synchronizing word or an address word. The synchronization and address word determination is also carried out while bit synch is obtained and the valid data/preamble determination is effected.

REFERENCES:
patent: 4001693 (1977-01-01), Stackhouse et al.
patent: 4229822 (1980-10-01), Bench
patent: 4353065 (1982-10-01), Mori

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