1. A method performed on a contact-less communication device for detecting a delimiter pattern in a signal stream, wherein the signal stream contains a carrier or subcarrier modulated by the delimiter pattern comprising: specifying an expected delimiter occurrence time of an occurrence of the delimiter pattern and a tolerance zone within which the expected delimiter occurrence time may jitter; rectifying or demodulating the signal stream to obtain a data stream and performing a zero detection by approximation, within the tolerance zone, to find a zero of the cross correlation function (CCF) of the data stream within the delimiter pattern; calculating a first maximum of the cross correlation function (CCF) within the tolerance zone by use of the approximated zero; calculating all other maxima of the cross correlation function (CCF) within the tolerance zone; detecting a highest maximum among the calculated maxima, which highest maximum is representative for the moment in time of the occurrence of the delimiter pattern.