Method and apparatus for digital automatic frequency control of

Details Method and apparatus for digital automatic frequency control of Method and apparatus for digital automatic frequency control of

1993-09-24

1995-06-06

Urban, Edward F.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

4551922, 455264, 375344, H04B 110

Patent

active

054230853

ABSTRACT:
An automatic frequency control method re-modulates a binary data sequence output from an equalizer using the convolution of an estimated channel characteristic value function and a transfer function of the modulator in the transmitter of a communication system, to obtain a reference phase. The reference phase then is compared with a receiving phase to produce a phase error value. The phase error value is converted into a frequency error value, which is then converted into an analog control voltage and applied to a voltage controlled oscillator. Apparatus for performing the method includes an equalizer, a channel characteristic estimator, a re-modulator, a phase comparator, a frequency error estimator and a digital-to-analog converter, to thus improve the receiving performance of a receiver by digital implementation.

REFERENCES:
patent: 3163823 (1964-12-01), Kellis et al.
patent: 4696056 (1987-09-01), Morita
patent: 4814887 (1989-03-01), Marz et al.
patent: 5228062 (1993-07-01), Bingham

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