System and method for minimizing frequency offsets between digit

Details System and method for minimizing frequency offsets between digit System and method for minimizing frequency offsets between digit

1992-05-20

1994-01-04

Kuntz, Curtis

Pulse or digital communications

Repeaters

Testing

375 96, 375 97, 375111, 375114, H03H 730, H03H 740, H03K 5159, H03D 100

Patent

active

052767060

ABSTRACT:
A system and method for frequency acquisition by a mobile receiver 14 in a cellular communication system. Data for part of a frame 10 is sampled. Synchronization pattern 36 is rotated by a pattern rotator 37 to simulate fixed frequency offsets. The known sync pattern 36 is correlated with the sampled data by correlator 30 for a number of phase advances corresponding to the simulated fixed frequency offsets. The peak outputs 54 and 58 of the correlator 30 for the number of fixed frequency offsets is interpolated by parabolic interpolator 46 to adjust the receivers voltage controlled crystal oscillator 49 to reduce the offset.

REFERENCES:
patent: 3943346 (1976-03-01), Urkowitz et al.
patent: 4644561 (1987-02-01), Paneth et al.
patent: 4941155 (1990-07-01), Chuang et al.
patent: 5068916 (1991-11-01), Harrison et al.
patent: 5121414 (1992-06-01), Levine et al.
patent: 5150380 (1992-09-01), Okanoue

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