Patent ID: 7508870

Claim:
A method for calculation of filtered channel estimation values in radio systems, comprising: determining a sequence of unfiltered channel estimation values; selecting a specific set of filter coefficients from two or more filter coefficient sets, with the filter coefficients being calculated on the basis of the MMSE optimality criterion for a predetermined recursive digital filter; and filtering of the sequence of unfiltered channel estimation values by means of the recursive digital filter using the selected filter coefficients in order to calculate the filtered channel estimation values, wherein each set of the two or more filter coefficient sets is independent of the signal-to-interference-and-noise ratio, and wherein each set of the two or more filter coefficient sets is calculated such that the respective set of filter coefficients minimizes a sum of error deviations at two or more different values of the signal-to-interference-and-noise ratio, wherein an error deviation is defined as the distance between the mean square error of the respective set of filter coefficients at a fixed signal-to-interference-and-noise ratio, and the respective optimally obtainable mean square error of a set of filter coefficients at the same fixed signal-to-interference-and-noise ratio.