Digital signal receiver having a dual bandwidth tracking loop

Details Digital signal receiver having a dual bandwidth tracking loop Digital signal receiver having a dual bandwidth tracking loop

1978-12-07

1981-01-06

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329104, 329122, 331 12, 331 17, 375 81, 455260, H03D 318, H03L 710

Patent

active

042439418

ABSTRACT:
A DPSK digital signal receiver is disclosed that has a dual bandwidth offset Costas loop that is switchable from an acquire bandwidth to a narrower tracking bandwidth in response to detection of a start code preceding a message signal included in the digital signal. Detection of the start signal may occur before absolute carrier lock on, which then is completed in the narrow-band tracking mode. Thus, carrier acquisition is achieved much faster than that obtained by prior art circuits requiring absolute carrier lock on before switching bandwidths.

REFERENCES:
patent: 3101448 (1963-08-01), Costas
patent: 3586776 (1971-06-01), Salava
patent: 3768030 (1973-10-01), Brown et al.
patent: 3906445 (1975-09-01), Beckmann et al.
patent: 3909735 (1975-09-01), Anderson et al.
patent: 3983501 (1976-09-01), Lindstrum

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