Carrier frequency error detector capable of accurately detecting

Details Carrier frequency error detector capable of accurately detecting Carrier frequency error detector capable of accurately detecting

1992-07-30

1994-01-04

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375 96, 375 97, 375 86, 329304, H04L 2706

Patent

active

052767108

ABSTRACT:
On detecting a carrier frequency error in a received signal, a correlation unit (12) detects a correlated signal in signals which a transmission unique word signal in the received signal and a local unique word signal are differentially detected. A frequency fine detection unit (17) detects a fine frequency error by using the correlated signal and a frame timing signal. A frequency coarse detection unit (21) detects a coarse frequency error by using the buffered signal from a data buffer (20) and the frame timing signal. A first adder (25) adds the fine frequency error to the coarse frequency error to a first added signal. A second adder (31) adds the first added signal to a maximum power frequency detected by a maximum power frequency detection unit (27) to produce the carrier frequency error.

REFERENCES:
patent: 4485477 (1984-11-01), Nossen
patent: 4726043 (1988-02-01), Levesque
patent: 4829543 (1989-05-01), Borth et al.
patent: 5012491 (1991-04-01), Iwasaki
patent: 5031193 (1991-07-01), Atkinson et al.

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