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AssigneeCommissariat A L'energie Atomique Et Aux Energies
InventorsJacques Reverdy, Elisabeth Crochon, Francois Dehmas, Florian Pebay-Peyroula
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A method for phase modulation of a carrier signal from a transmitter to a contactless transponder in which data is coded as consecutive symbols, each corresponding to a predefined number of carrier cycles, and in which a symbol time is at least two cycles of the carrier signal includes, at the transmitter, spreading a phase jump of a symbol in relation to a preceding symbol over a first part of the symbol time. The establishment of the phase jump is completed in the first part of the symbol time. The periods of the cycles are constant during a second part of the symbol time.
1-26. (canceled)
A method for phase modulation of a carrier signal from a transmitter to a contactless transponder in which data is coded as consecutive symbols, each corresponding to a predefined number of carrier cycles, and in which a symbol time is at least two carrier cycles of said carrier signal, said method comprising, at said transmitter, spreading a phase jump of a symbol in relation to a preceding symbol over a first part of said symbol time, establishment of said phase jump being completed in said first part of said symbol time and periods of said carrier cycles being constant during a second part of said symbol time.
An apparatus for phase modulation of a carrier signal from a transmitter to a contactless transponder, said apparatus comprising a data coder for coding data as consecutive symbols, each corresponding to a predefined number of carrier cycles and having a symbol time that is at least two carrier cycles of said carrier signal, wherein said data coder is configured to apply a phase jump between two consecutive symbols by spreading, on said transmitter, a phase jump of a symbol in relation to a preceding symbol over a first part of said symbol time, establishment of said phase jump being completed in said first part of said symbol time and periods of said carrier cycles being constant during a second part of said symbol time.
Dependencies are inferred from the claim text.