# US 2010/0164615 A1 · System And Method For Relative Phase Shift Keying > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2010/0164615 A1 - Document ID: US20100164615A1 - Status: Published application - Kind: A1 - Application number: 12/347,052 - Filed: 2008-12-31 - Published: 2010-07-01 - Earliest claimed: 2008-12-31 - Assignees: Hunt Technologies, Inc. - Inventors: Damian Bonicatto - Web page: https://patentgrep.com/patent/US20100164615A1 ## CPC - H04L 27/2053: {using more than one carrier, e.g. carriers with different phases} - H04L 27/3461: {in order to transmit a subchannel} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Disclosed are various embodiments of systems and methods for relative phase shift keying. In one embodiment, an analog waveform is converted to digital signals. A specified frequency range is isolated and the magnitudes of tones corresponding to a channel are measured. The relative phase of a subset of the tones having the greatest magnitude is measured and a relative phase component is generated. At least one symbol is associated with the subset of tones and the relative phase component. ## Claims ### Claim 1 (depends on 1) The method of claim 1, wherein the step of decoding further comprises: receiving an analog waveform; converting the analog waveform to at least one digital waveform isolating a specified frequency range from the at least one digital waveform; measuring a magnitude of a first plurality of tones within the specified frequency range; identifying a subset of the first plurality of tones having the greatest magnitude relative to a remainder of the first plurality of tones; measuring a phase of each tone of the subset relative to other tones of the subset; generating a relative phase component from the measured phase of each tone of the subset relative to other tones of the subset; and decoding at least one symbol from the subset of tones and the relative phase component. ### Claim 2 (depends on 1) The method of claim 1, wherein the relative phase component corresponds to at least one additional bit of digital data encoded within the analog waveform. ### Claim 3 (depends on 1) The method of claim 1, wherein the step of measuring a phase of each tone of the subset relative to other tones of the subset further comprises the step of measuring a phase offset between a first tone of the subset and a second tone of the subset. ### Claim 4 (depends on 1) The method of claim 1, wherein the step of generating a relative phase component from the measured phase of each tone of the subset further comprises the step of associating a first bit with the relative phase component if a first measured phase of a first tone of the subset is substantially similar to a second measured phase of a second tone of the subset. ### Claim 5 (depends on 4) The method of claim 4, wherein the step of generating a relative phase component from the measured phase of each tone of the subset further comprises the step of associating a second bit with the relative phase component if the first measured phase of the first tone of the subset is different from the second measured phase of the second tone of the subset. ### Claim 6 (depends on 4) The method of claim 4, wherein the step of measuring a phase of each tone of the subset relative to other tones of the subset further comprises the step of subtracting a first measured phase of the first tone from a second measured phase of the second tone of the subset. ### Claim 7 (depends on 1) The method of claim 1, wherein the step of generating a relative phase component from the measured phase of each tone of the subset further comprises the step of associating a symbol with a combination of the measured phase of each tone of the subset relative to one another. ### Claim 8 (depends on 1) The method of claim 1, wherein the step of decoding at least one symbol from the subset of tones and the relative phase component further comprises the step of retrieving a symbol from a symbol lookup table, the symbol lookup table indexed by a value associated with a combination of the subset of the plurality of tones and the relative phase component. ### Claim 9 (depends on 1) The method of claim 1, wherein the step of decoding at least one symbol from the subset of tones and the relative phase component further comprises the step of associating a first symbol with the subset and associating a second symbol with the relative phase component. ### Claim 10 A software radio system, comprising: a signal receiver configured to receive at least one analog waveform; at least one processor configured to isolate a specified frequency range from the at least one analog waveform; a correlator configured to measure a magnitude of a first plurality of tones within the specified frequency range, identify a subset of the first plurality of tones having the greatest magnitude relative to a remainder of the first plurality of tones, and measure a phase of each tone of the subset relative to other tones of the subset; wherein the at least one processor generates a relative phase component from the measured phase of each tone of the subset relative to other tones of the subset and decodes at least one symbol from the subset of tones and the relative phase component. ### Claim 11 (depends on 10) The system of claim 10, wherein the relative phase component corresponds to at least one additional bit of digital data encoded within the analog waveform. ### Claim 12 (depends on 10) The system of claim 10, wherein the correlator is further configured to measure a phase offset between a first tone of the subset and a second tone of the subset. ### Claim 13 (depends on 10) The system of claim 10, wherein the at least one processor generates a relative phase component from the measured phase of each tone by associating a first bit with the relative phase component if a first measured phase of a first tone of the subset is substantially similar to a second measured phase of a second tone of the subset. ### Claim 14 (depends on 13) The system of claim 13, wherein the at least one processor is further configured to generate a relative phase component from the measured phase of each tone of the subset by associating a second bit with the relative phase component if the first measured phase of the first tone of the subset is different from the second measured phase of the second tone of the subset. ### Claim 15 (depends on 13) The system of claim 13, wherein the correlator measures a phase of each tone of the subset relative to other tones of the subset by subtracting a first measured phase of the first tone from a second measured phase of the second tone of the subset. ### Claim 16 (depends on 10) The system of claim 10, wherein the at least one processor is further configured to generate a relative phase component from the measured phase of each tone of the subset by associating a symbol with a combination of the measured phase of each tone of the subset relative to one another. ### Claim 17 (depends on 10) The system of claim 10, wherein the at least one processor is further configured to decode the at least one symbol from the subset of tones and the relative phase component by retrieving a symbol from a symbol lookup table, the symbol lookup table indexed by a value associated with a combination of the subset of the plurality of tones and the relative phase component. ### Claim 18 (depends on 10) The system of claim 10, wherein the at least one processor is further configured to decode the at least one symbol from the subset of tones and the relative phase component by associating a first symbol with the subset and associating a second symbol with the relative phase component. ### Claim 19 A computer readable medium comprising a program for decoding a multi-phase waveform, the program when executed by a processor causing the processor to perform the steps: receiving an analog waveform; converting the analog waveform to at least one digital waveform isolating a specified frequency range from the at least one digital waveform; measuring a magnitude of a first plurality of tones within the specified frequency range; identifying a subset of the first plurality of tones having the greatest magnitude relative to a remainder of the first plurality of tones; measuring a phase of each tone of the subset relative to other tones of the subset; generating a relative phase component from the measured phase of each tone of the subset relative to other tones of the subset; and decoding at least one symbol from the subset of tones and the relative phase component. ### Claim 20 (depends on 19) The computer readable medium of claim 19, wherein the relative phase component corresponds to at least one additional bit of digital data encoded within the analog waveform. ### Claim 21 (depends on 19) The computer readable medium of claim 19, wherein the step of measuring a phase of each tone of the subset relative to other tones of the subset further comprises the step of measuring a phase offset between a first tone of the subset and a second tone of the subset. ### Claim 22 (depends on 19) The computer readable medium of claim 19, wherein the step of generating a relative phase component from the measured phase of each tone of the subset further comprises the step of associating a first bit with the relative phase component if a first measured phase of a first tone of the subset is substantially similar to a second measured phase of a second tone of the subset.