Patent ID: 7978788
Filing Date: 2011-07-12
Classification: H04L

Abstract:
1. A method of estimating a DC offset for a signal received in a radio receiver, wherein the received signal includes a digitally modulated signal component, a DC offset component, and a noise component, said digitally modulated signal component having a statistical distribution, said method comprising: estimating by a parameter estimator, at least one parameter of a postulate of the statistical distribution of the digitally modulated signal component; estimating by a DC offset estimator, the DC offset utilizing the at least one estimated parameter of the postulate of the statistical distribution of the digitally modulated signal component; determining by a stopping criteria checking unit, whether a predefined stopping criterion has been met; if the predefined stopping criterion has been met, subtracting the estimated DC offset from the received signal; if the predefined stopping criterion has not been met: determining by a comparator, whether a ratio of a chosen one of the estimated parameter(s) to the estimated noise standard deviation is greater than a pre-defined threshold value; if the ratio is greater than the predefined threshold value, utilizing the estimated DC offset; and if the ratio is not greater than the predefined threshold value, calculating and utilizing an average value of the received signal over a received burst to estimate the DC offset.