# US 2013/0154756 A1 · Method for the phase modulation of a carrier signal transmitted from a transmitter to a contactless transponder, and device for implementing same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0154756 A1 - Document ID: US20130154756A1 - Status: Published application - Kind: A1 - Application number: 13/806,912 - Filed: 2011-06-24 - Published: 2013-06-20 - Earliest claimed: 2010-06-25 - Assignees: Commissariat A L'energie Atomique Et Aux Energies - Inventors: Jacques Reverdy; Elisabeth Crochon; Francois Dehmas; Florian Pebay-Peyroula - Web page: https://patentgrep.com/patent/US20130154756A1 ## CPC - H03C 3/02: Details - H04L 27/2014: {in which the phase changes in a piecewise linear manner during each symbol period, e.g. minimum shift keying, fast frequency shift keying (H04L27/201 takes precedence)} - H03C: MODULATION (masers or lasers H01S; coding, decoding or code conversion H03M) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract 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. ## Claims ### Claim at position 1 1-26. (canceled) ### Claim 27 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. ### Claim 28 (depends on 27) The method of claim 27, wherein said phase modulation comprises at least four phase states. ### Claim 29 (depends on 27) The method of claim 27, wherein said phase modulation comprises at least eight phase states. ### Claim 30 (depends on 27) The method of claim 27, wherein, when said phase jump is greater than a predefined phase jump threshold, a phase jump portion is applied in said first part of said symbol time to at least two carrier cycles of a symbol to be transmitted, a sum of said phase jump portions being equal to said phase jump. ### Claim 31 (depends on 30) The method of claim 30, wherein said predefined phase jump threshold is π/4. ### Claim 32 (depends on 30) The method of claim 30, wherein a phase jump portion is less than or equal to π/4. ### Claim 33 (depends on 30) The method of claim 30, wherein phase jump portions are all of the same value. ### Claim 34 (depends on 30) The method of claim 30, further comprising applying phase jump portions successively to first carrier cycles of a symbol to be transmitted. ### Claim 35 (depends on 30) The method of claim 30, further comprising applying said phase jump portions to rising edges of said symbol to be transmitted. ### Claim 36 (depends on 27) The method of claim 27, wherein spreading comprises spreading said phase jump, said carrier signal, and a derivative thereof continuously over said first part of said symbol time. ### Claim 37 (depends on 27) The method of claim 27, wherein said symbol time is equal to four or eight carrier cycles. ### Claim 38 (depends on 27) The method of claim 27, wherein said first part of said symbol time has a duration that is less than or equal to 75% of said symbol time. ### Claim 39 (depends on 27) The method of claim 27, wherein a maximum phase jump between two consecutive symbols is less than π. ### Claim 40 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. ### Claim 41 (depends on 40) The apparatus of claim 40, wherein said phase modulation comprises at least four phase states. ### Claim 42 (depends on 40) The apparatus of claim 40, wherein said data coder is configured to apply a phase jump portion to at least two carrier cycles of a symbol to be transmitted when a phase jump between two consecutive symbols to be transmitted is greater than a predefined phase jump threshold. ### Claim 43 (depends on 42) The apparatus of claim 42, wherein said predefined phase jump threshold is π/4. ### Claim 44 (depends on 42) The apparatus of claim 42, wherein said phase jump portion is less than or equal to π/4. ### Claim 45 (depends on 42) The apparatus of claim 42 wherein phase jump portions are all of the same value. ### Claim 46 (depends on 42) The apparatus of claim 42, wherein said data coder is configured to apply phase jump portions successively to first carrier cycles of a symbol to be transmitted. ### Claim 47 (depends on 42) The apparatus of claim 42, wherein said data coder is configured to apply phase jump portions to rising edges of a symbol to be transmitted. ### Claim 48 (depends on 42) The apparatus of claim 42, wherein said data coder further comprises cells for applying a phase jump portion to a carrier signal to cover a range of phase states, a multiplexer for receiving, as input, said carrier signals, said phase-shifted carrier signals, and data to be coded, and a multiplexing control unit for controlling said multiplexer. ### Claim 49 (depends on 40) The apparatus of claim 40, wherein said data coder is configured to continuously spread said phase jump, said carrier signal, and a derivative thereof over said first part of said symbol time. ### Claim 50 (depends on 49) The apparatus of claim 49, wherein said data coder comprise a phase slip module that varies carrier frequency during said first part of said symbol time. ### Claim 51 (depends on 40) The apparatus of claim 40, wherein said symbol time is equal to four or eight carrier cycles. ### Claim 52 (depends on 40) The apparatus of claim 40, wherein said first part of said symbol time has a duration less than or equal to 75% of said symbol time. ### Claim 53 (depends on 40) The apparatus of claim 40, wherein a maximum total phase jump between two consecutive symbols is less than π.