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1. WO2020186037 - CONSTANT ENVELOPE PATH-DEPENDENT PHASE MODULATION

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[ EN ]

CLAIMS

1. A communications apparatus configured to transmit a modulated signal, comprising: a source configured to emit a carrier waveform;

a modulator configured to modulate the carrier waveform according to a path-dependent phase modulation scheme to produce the modulated signal; and

a mapping module configured to map a received data payload to the path-dependent phase modulation scheme, each symbol S in the path-dependent phase modulation scheme including a concatenation of at least one location bit L and at least one path bit P.

2. The communications apparatus of claim 1, wherein the at least one location bit corresponds to a current location of the symbol in a symbol constellation corresponding to the path-dependent phase modulation scheme, and the at least one path bit indicates a clockwise or counter-clockwise rotation from a prior location of the symbol to the current location of the symbol in a complex plane of the symbol constellation.

3. The communications apparatus of claim 2, further comprising:

a pulse-shaping filter configured to control the modulator, based on an output from the mapping module, to impose the path-dependent phase modulation scheme on the carrier waveform to generate the modulated signal.

4. The communications apparatus of claim 2, wherein the at least one location bit represents a value of lower order bits at the current location of the symbol.

5. The communications apparatus of claim 1, wherein the at least one path bit is a highest order bit in the symbol.

6. The communications apparatus of claim 2, wherein the clockwise or counter-clockwise rotation is a rotation of 180 degrees.

7. The communications apparatus of claim 2, wherein the clockwise rotation represents a zero bit and the counter-clockwise rotation represents a one bit.

8. The communications apparatus of claim 3, further comprising a forward error correction module configured to receive the data payload and to apply a forward error correcting code to the data payload.

9. The communications apparatus of claim 1, wherein the communications apparatus is an optical transmitter, the modulator is an electro-optic modulator, the source is an optical source and the modulated signal is a modulated optical signal.

10. The communications apparatus of claim 1, wherein the communications apparatus is a radio frequency (RF) transmitter, the source is an RF carrier waveform source and the modulated signal is a modulated RF signal.

11. The communications apparatus of claim 1, wherein S=[PL], where L represents log2(2N) bits, there being N symbol locations defined in a symbol constellation corresponding to the path-dependent phase modulation scheme.

12. The communications apparatus of claim 11, further comprising:

a pulse-shaping filter configured to control the modulator, based on an output from the mapping module, to impose the path-dependent phase modulation scheme on the carrier waveform to generate the modulated signal, each symbol corresponding to a phase transition in the modulated signal, with the at least one location bit, L, identifying an amount of phase change corresponding to the phase transition, and the at least one path bit, P, identifying whether the phase change is positive or negative.

13. The communications apparatus of claim 12, wherein the amount of phase change corresponding to the phase transition is pi radians.

14. The communications apparatus of claim 12, wherein a positive phase change represents a one bit and a negative phase change represents a zero bit.

15. A communications method, comprising:

generating a carrier waveform;

modulating, using a modulator, the carrier waveform according to a path-dependent phase modulation scheme to produce a modulated signal; and

mapping, using a mapping module, a received data payload to the path-dependent phase modulation scheme, each symbol S in the path-dependent phase modulation scheme including a concatenation of at least one location bit L and at least one path bit P.

16. The method of claim 15, wherein the at least one location bit corresponds to a current location of the symbol in a symbol constellation corresponding to the path-dependent phase modulation scheme, and the at least one path bit indicates a clockwise or counter-clockwise rotation from a prior location of the symbol to the current location of the symbol in a complex plane of the symbol constellation.

17. The method of claim 16, further comprising:

controlling the modulator, based on an output from the mapping module, to impose the path-dependent phase modulation scheme on the carrier waveform to generate the modulated signal.

18. The method of claim 16, wherein the at least one location bit represents a value of lower order bits at the current location of the symbol.

19. The method of claim 15, wherein the at least one location bit indicates an amount of a phase transition in the modulated signal and the at least one path bit indicates a direction of the phase transition.

20. The method of claim 15, wherein each symbol, S, is defined by S=[PL], where L corresponds to the at least one location bit and represents log2(2N) bits, there being N symbol locations defined in a symbol constellation corresponding to the path-dependent phase modulation scheme, and P corresponds to the at least one path bit.

21. An optical transmitter configured to transmit a modulated optical signal, the optical transmitter comprising:

an optical source configured to emit a carrier waveform;

a modulator configured to modulate the carrier waveform according to a path-dependent phase modulation scheme to produce the modulated optical signal;

a mapping module configured to map a received data payload to the path-dependent phase modulation scheme, each symbol in the path-dependent phase modulation scheme including a concatenation of at least one location bit and at least one path bit, the at least one location bit corresponding to a current location of the symbol in a symbol constellation corresponding to the path-dependent phase modulation scheme, and the at least one path bit representing a clockwise or counter-clockwise rotation from a prior location of the symbol to the current location of the symbol in a complex plane of the symbol constellation; and

a pulse-shaping filter configured to control the modulator, based on an output from the mapping module, to impose the path-dependent phase modulation scheme on the carrier waveform to generate the modulated optical signal.

22. The optical transmitter of claim 21, wherein the at least one location bit represents a value of lower order bits at the current location of the symbol.

23. The optical transmitter of claim 21, wherein the at least one path bit is a highest order bit in the symbol.

24. The optical transmitter of claim 21, wherein the clockwise or counter-clockwise rotation is a rotation of 180 degrees.

25. The optical transmitter of claim 21, wherein the clockwise rotation represents a zero bit and the counter-clockwise rotation represents a one bit.

26. The optical transmitter of claim 21, further comprising a forward error correction module configured to receive the data payload and to apply a forward error correcting code to the data payload.

27. The optical transmitter of claim 21, wherein the modulator is an electro-optic modulator.

28. An optical transmitter configured to transmit a modulated optical signal, the optical transmitter comprising:

an optical source configured to emit a carrier waveform;

a modulator configured to modulate the carrier waveform according to a path-dependent phase modulation scheme to produce the modulated optical signal;

a mapping module configured to map a received data payload to symbols according to the path-dependent phase modulation scheme, each symbol, S, including a concatenation of at least one location bit, L, and at least one path bit, P, such that S=[PL], where L represents log2(2N) bits, there being N symbol locations defined in a symbol constellation corresponding to the path-dependent phase modulation scheme; and

a pulse-shaping filter configured to control the modulator, based on an output from the mapping module, to impose the path-dependent phase modulation scheme on the carrier waveform to generate the modulated optical signal, each symbol corresponding to a phase transition in the modulated optical signal, with the at least one location bit, L, identifying an amount of phase change corresponding to the phase transition, and the at least one path bit, P, identifying whether the phase change is positive or negative.

29. The optical transmitter of claim 28, wherein the amount of phase change corresponding to the phase transition is pi radians.

30. The optical transmitter of claim 28, further comprising a forward error correction module configured to receive the data payload and to apply a forward error correcting code to the data payload.

31. The optical transmitter of claim 28, wherein a positive phase change represents a one bit and a negative phase change represents a zero bit.

32. An optical transmitter configured to transmit a modulated optical signal, the optical transmitter comprising:

an optical source configured to emit a carrier waveform;

a modulator configured to modulate the carrier waveform according to a path-dependent phase modulation scheme to produce the modulated optical signal;

a mapping module configured to map a received data payload to the path-dependent phase modulation scheme, each symbol in the path-dependent phase modulation scheme including a concatenation of at least one location bit and at least one path bit, the at least one location bit identifying an amount of a phase transition in the modulated optical signal and the at least one path bit identifying a direction of the phase transition; and

a pulse-shaping filter configured to control the modulator, based on an output from the mapping module, to impose the path-dependent phase modulation scheme on the carrier waveform to generate the modulated optical signal.

33. The optical transmitter of claim 32, wherein the amount of the phase transition is an integer multiple of pi radians.

34. The optical transmitter of claim 32, wherein the at least one path bit is a highest order bit in the symbol.

35. The optical transmitter of claim 32, wherein each symbol, S, is defined by S=[PL], where L corresponds to the at least one location bit and represents log2(2N) bits, there being N symbol locations defined in a symbol constellation corresponding to the path-dependent phase modulation scheme, and P corresponds to the at least one path bit.

36. The optical transmitter of claim 32, wherein a clockwise direction of the phase transition corresponds to a zero bit and a counter-clockwise direction of the phase transition corresponds to a one bit.

37. The optical transmitter of claim 32, further comprising a forward error correction module configured to receive the data payload and to apply a forward error correcting code to the data payload.