interference cancellation for wideband and narrowband communications systems is provided without apriori knowledge of statistical information about an interfering signal . in one embodiment a demodulator circuit can operate in an environment where a “ no lock ” situation would normally occur to remove the interference and acquire signals in low signal - to - noise ratio conditions and high signal - to - interference ration conditions . in other embodiments , performance is improved by introducing statistics of the interfering signal , and these statistics regarding the communications channel and interference properties can be adaptive or “ learned ” in other embodiments .