Method for determining an inverse impulse response of a communication channel

A method for determining an inverse impulse response of a communication channel with a pulse amplitude modulation (PAM) receiver connected to the communication channel, comprising an adaptive filter, wherein the communication channel, for the purpose of communication with a PAM transmitter by means of an electrical data signal, is configured with at least two states,

• wherein the states each represent a symbol, wherein a symbol is assigned to each clock of the data signal,
• wherein the PAM receiver has an electronic circuit including the following:
• a data interface configured to connect to the communication channel;
• a circuit section connected to the data interface, including:
• an equalizer for compensating for disturbances of the digital signal caused by the communication channel, wherein the equalizer has a first input for receiving the data signal and an output for outputting a processed data signal;
• an interpreter arranged downstream of the equalizer, for detecting symbols transmitted by the digital signal, wherein the interpreter receives the processed data signal;
• the method comprising:
• switching on the PAM receiver in a first method step;
• if a PAM transmitter is switched on, setting a difference, UF, between a clock frequency of the data signal and a sampling frequency of the PAM receiver in a second method step;
• comparing a symbol output by the interpreter with a state that is supplied to the interpreter, and outputting an error value, E, in a third method step, wherein a symbol associated with a sampling clock is compared with a state associated with the same sampling clock;
• adapting m filter coefficients of the equalizer to minimize error values in a fourth method step with m as natural number;
• repeating the third method step and the fourth method step until an error limit value is reached.