FIELD: radio engineering, communication.
SUBSTANCE: invention relates to communication engineering and can be used in optical communication systems. Filter device includes a filter (101) for filtering an input signal using first and second sets of filter coefficients to obtain frequency-domain first and second filtered signals (103) for correlation of a first subset of frequency-domain components of the first filtered signal to obtain a first correlation value, and correlation of a second subset of frequency-domain components of the second filtered signal to obtain a second correlation value, wherein the first subset of correlated frequency-domain components and the second subset of correlated frequency-domain components are respectively located in a given range of correlated signals comprising a clock frequency; and a processor (105) configured to select, for filtration of the input signal, either the first set of filter coefficients or the second set of filter coefficients based on the first correlation value and the second correlation value.
EFFECT: providing frequency-domain filter adaptation.
14 cl, 6 dwg
