Patent ID: 6771937
Filing Date: 2004-08-03
Classification: H03J

Abstract:
A circuit configuration, comprising:a radio-frequency section having a reception mixing stage configured to receive an RF received signal and to convert the RF received signal to an analog IF received signal by down-mixing with an adjustable mixing frequency; and a signal processing circuit connected to said radio-frequency section and having an A/D converter for converting the analog IF received signal to a digital received signal; a digital filter connected to receive the digital received signal from said A/D converter, said digital filter having a given pass band and outputting a filtered digital received signal; a channel estimator for estimating a transfer function of a radio channel connected to said digital filter; and a frequency estimator contained in said channel estimator and connected to receive the filtered digital received signal from said digital filter, said frequency estimator continuously determining a first frequency correction control signal representative of a frequency offset between a frequency of the analog IF received signal and a frequency characteristic of the pass band of said digital filter, and said frequency estimator outputting the first frequency correction control signal for readjusting the mixing frequency in said radio-frequency section.