Timing frequency recovery

Details Timing frequency recovery Timing frequency recovery

1978-08-24

1981-02-03

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

375106, H04J 306

Patent

active

042492521

ABSTRACT:
A method and apparatus for recovering the timing frequency in a modulated data signal receiver containing a timing frequency generator, by demodulating a received signal with the aid of carriers which are shifted by 90.degree. in phase relative to one another to form two demodulation products, forming the sum of the squares of the two demodulation products, and determining changes in the value of that sum with respect to time to provide characteristic values which determine the adjustment criterion for the timing frequency generator.

REFERENCES:
patent: 4015083 (1977-03-01), Bellisio
patent: 4061978 (1977-12-01), Motley et al.
patent: 4109102 (1978-08-01), Yoshida et al.

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