System and method for maintaining continuous phase during up/dow

Details System and method for maintaining continuous phase during up/dow System and method for maintaining continuous phase during up/dow

1995-04-03

1998-11-03

Chin, Wellington

Pulse or digital communications

Receivers

Automatic frequency control

375327, 375375, 395381, 39542104, 395496, 36494834, H03D 324, H04L 2706

Patent

active

058320431

ABSTRACT:
A digital rotating complex phasor generator (60) provides a constant magnitude continuous phase signal at either a positive or a negative frequency for translating the frequencies of a modulated signal from a near-zero intermediate frequency (IF) to baseband. The rotating complex phasor generator allows a digital receiver front-end to down-convert the received signal to an IF of substantially zero Hertz prior to analog to digital conversion, even in the presence of large Doppler frequency shifts and tuning uncertainties which may result in a residual IF carrier which has either a positive or a negative frequency.

REFERENCES:
patent: 4916405 (1990-04-01), Keate et al.
patent: 5107522 (1992-04-01), Kitayama et al.
patent: 5113416 (1992-05-01), Lindell
patent: 5287388 (1994-02-01), Ogura et al.
patent: 5311546 (1994-05-01), Paik et al.
patent: 5400363 (1995-03-01), Waugh et al.
patent: 5402449 (1995-03-01), Schultes et al.
Francis Natol:, "AFC Tracking Algorithms", 1994 pp. 935-947.

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