METHOD FOR THE PHASE MODULATION OF A CARRIER SIGNAL TRANSMITTED FROM A TRANSMITTER TO A CONTACTLESS TRANSPONDER, AND DEVICE FOR IMPLEMENTING SAME

摘要

The invention relates to a method for the phase modulation of a carrier signal transmitted from a transmitter to a contactless transponder, and to a device for implementing same. According to said method, data is encoded in the form of consecutive symbols (Sn-1, Sn), each of which correspond to a predefined number of carrier cycles, and have a symbol time (Ts) that is greater than or equal to two cycles of the carrier signal. Then, at the transmitter, a phase hop is applied to one symbol with respect to a previous symbol over a first portion (11) of the symbol time, the establishment of the phase hop being completed during the first portion (11) of the symbol time, and the periods of the cycles being constant during the second portion of the symbol time.