Method for preprocessing a signal and method for signal processing

A method for preprocessing a signal and for signal processing are suggested, wherein an iterative process with at least one iteration is performed to generate an output signal (O) based on an input signal (I). In each iteration a preceding intermediate output signal (PIO) and said input signal (I) are received (S 21 ). A process (g) is applied (S 22 ) to said preceding intermediate output signal (PIO) to transform the latter according to a given transfer function (h) so as to generate a transformed preceding intermediate output signal (TPIO). Then, said input signal (I) is subtracted (S 23 ) from said transformed intermediate output signal (TPIO). Thereby, an intermediate error signal (IE) is generated and then added to said intermediate output signal (PIO) so as to generate a succeeding intermediate output signal (SIO) which is used as an output signal (O) after the iterative process stopped.