According to an aspect of the present inventive concept there is provided a biometric identification system comprising:a bio-impedance measurement unit adapted to be worn by a user, the bio-impedance measurement unit including:a plurality of measurement electrodesa measurement circuit adapted to perform bio-impedance measurements on the user via a plurality of different groups of said plurality of measurement electrodes, each of said groups including at least two measurement electrodes,wherein the impedance measurement circuit, for each group of measurement electrodes, is adapted to measure an impedance in each frequency channel of a set of frequency channels,the system further comprising:a storage unit adapted to store each measured impedance in a measurement data set, andan identification unit adapted to perform a comparison based on the measurement data set and a reference data set.
