In a circuit (2, 3) for processing at least one output signal (C1, C2, C3) of a communication stage, which at least one output signal (C1, C2, C3) of a communication stage can be generated by means of a communication stage, there are provided signal-mixing means (5), which signal-mixing means (5) are arranged to receive at least two output signals (C1, C2, C3) of communication stages and to mix the at least two output signals (C1, C2, C3) of communication stages and to transmit a collision signal representing the result of the mixing of the at least two output signals (C1, C2, C3) of communication stages, which collision signal represents a simultaneous occurrence of at least two output signals (C1, C2, C3) of communication stages in an electromagnetic field.