Method and apparatus for aligning a digital receiver

Details Method and apparatus for aligning a digital receiver Method and apparatus for aligning a digital receiver

1994-09-06

1995-12-26

Chin, Stephen

Pulse or digital communications

Receivers

Automatic frequency control

455257, H04L 2706

Patent

active

054794528

ABSTRACT:
A method is used in a receiver (100) for aligning the receiver (100). The method has a step of intercepting and demodulating the FM signal, which includes data symbols. The method has a step of determining error rates, in which the error rates of at least two subsets of the data symbols are determined. Each subset includes a plurality of the data symbols modulated at a unique one of a plurality of frequency deviations. The at least two subsets include data symbols of two opposite polarities. The method has a step of generating a frequency control signal, in which the frequency control signal is determined based on the error rates. The method has a step of aligning a receiver section (105), in which the receiver section (105) is aligned to the FM signal by controlling a local oscillator (320)which is responsive to the frequency control signal.

REFERENCES:
patent: 5222079 (1993-06-01), Rasor
"SENSAR" Series Service Manual, No. 68P81045C10, 1986, by Motorola, Inc., Schaumburg, Ill., pp. 1-5.

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