Patent ID: 6778598
Filing Date: 2004-08-17
Classification: H04L

Abstract:
A method for processing received signals having been transmitted via a transmission channel, comprising the steps of:estimating an estimated impulse response function (hk) of said channel based on received signals (y) which are received at a first time (tk); deriving history information (wink) based on at least one previously estimated impulse response function, calculating modifying information (mwink) on the basis of said history information (wink), and modifying said estimated impulse response function (hk) of said channel obtained on the basis of said received signals (y), by applying said modifying information (mwink) to said estimated impulse response function (hk) of said channel obtained on the basis of said received signals (y), thereby obtaining a modified impulse response function (hmk), characterized in that said history information (wink) is derived on the basis of the amplitude (|hk|) of said impulse response function (hk), a new history information (wink) is derived on the basis of the sum of the square amplitude (|hk|2) of a current impulse response function (hk) and previous history information (winkâˆ’1) each new history information (wink) is weighted by a predetermined factor (a), which factor defines the influence of the history for impulse response function modification, and each new history information is calculated using an equation of wink=a*(|Re{hk}|2+|Im{hk}|2+winkâˆ’1), with wink being the new history information, winkâˆ’1 being the previous history information, a being the predetermined factor, |Re{hk}|2 being the square value of the absolute value of the real part of the current impulse response function hk in complex representation, and |Im{hk}|2 being the square value of the absolute value of the imaginary part of current impulse response function hk in complex representation, with the sum of |Re{hk}|2+|Im{hk}|2 being representative of the amplitude of the impulse response function (hk).