Patent ID: 7940853

Claim:
A method for calculating zero-crossing reference sequences for the data detection of a sequence of zero crossings of a received signal that is based on a data symbol sequence angle-modulated signal, comprising calculating the zero-crossing reference sequences according to an equation specifying an output of a finite state machine that describes signal generation in a device, performing a demodulation by determining a transmitted data sequence by comparing the calculated zero-crossing reference sequences with a detected sequence of zero crossings, wherein the comparing comprises comparing a part-sequence of finite length of the detected sequence of zero crossings with the zero-crossing reference sequences for each time increment, wherein a data symbol transmitted in the time increment considered is determined by way of the comparison, and wherein determining the data symbol sequence is performed in accordance with the Viterbi algorithm by processing a trellis diagram that describes a state diagram of the finite state machine, for each time increment, wherein transition metric values between a precursor state and a target state in the trellis diagram are calculated by comparing the state-dependent zero-crossing reference sequences with the sequence of zero crossings detected for the time increment considered.