Decision-directed, automatic frequency control technique for non

Details Decision-directed, automatic frequency control technique for non Decision-directed, automatic frequency control technique for non

1983-01-17

1985-05-21

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329124, 329145, 375120, H03L 708, H04L 2714

Patent

active

045189226

ABSTRACT:
A data receiver apparatus for recovering digital data signals from an M-ARY FSK modulated signal incorporates a dedicated linear discriminator, downstream of the data recovery process, in the carrier tracking loop. Because the signal modulation components are removed prior to tracking, only frequency error remains, which is employed by the linear discriminator for steering a VCO in the frequency tracking loop. This results in a closed loop step response that rapidly converges to a stable level, and a linear frequency estimation characteristic.

REFERENCES:
patent: 3758870 (1973-09-01), Schmitt et al.
patent: 4039961 (1977-08-01), Ishio et al.
patent: 4079329 (1978-03-01), England et al.
patent: 4100499 (1978-07-01), Monrolin
patent: 4103244 (1978-07-01), Tan
patent: 4320345 (1982-03-01), Waggener
patent: 4394626 (1983-07-01), Kurihara et al.
Blerkom et al., "Digital Phase-Locked Loop", IBM Technical Disclosure Bulletin, vol. 10, No. 3, Aug. 1967, pp. 256, 257.

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