Phase-jump detector and corrector method and apparatus for phase-modulated communication systems that also provides a signal quality indication
AssigneeMilgo Electronic Corporation
InventorsRan-Fun Chiu, James Bryon Sherman, Judson Truman Gilbert
Life of this patent
Estimating the term…
Abstract
In a phase-modulated communication system utilizing voice-band communication channels wherein phase-jumps may be experienced, a phase-jump detector indicates the occurrence of such phase-jumps. A phase-jump corrector responds to the persistence of a phase-jump condition by correcting for it without requiring shut-down and complete reequalization of the transmission channel. Monitoring of the incoming signal for phase-jump occurrence provides a convenient signal quality indication that represents the magnitude of the error in the X and Y components of each received symbol.
Claims28
A method for detecting the occurrence of phase-jumps in a phase-modulated voice-band communication system wherein received phase symbols are converted into binary X and binary Y components, said method comprising:
- generating an error X and error Y indication that represents the difference between the binary X and binary Y components of a received symbol and the ideal binary X and binary Y components of that symbol;
- generating a rotated error X and rotated error Y indication that represents the difference between the binary X and binary Y components of and received symbol rotated by N degrees and the ideal binary X and binary Y components of the rotated symbol;
- and
- comparing the magnitude of the error X and error Y indication with the rotated error X and rotated error Y indication.
A method for detecting the occurrence of phase-jumps in a phase modulated voice-band communication system wherein received phase symbols are converted into binary X and binary Y components, said method comprising:
- comparing the binary X and binary Y components of the received symbol with the ideal binary X and binary Y components of that symbol;
- generating an error X and error Y indication that represents the difference between the received and the ideal binary X and binary Y components;
- generating a rotated binary X and binary Y component that represents the received symbol rotated N degrees;
- comparing the binary X and binary Y component of the rotated symbol with the ideal binary X and binary Y components of the rotated symbol;
- generating a rotated error X and rotated error Y indication that represents the difference between the received rotated and the ideal rotated binary X and binary Y components;
- and
- comparing the magnitude of the error X and error Y indication with the magnitude of the rotated error X and rotated error Y indication.
A method for producing a signal quality indication in a phase-modulated voice-band communication system wherein received symbols are converted into binary X and binary Y components, said method comprising:
- comparing the binary X and binary Y components of the received symbol with the ideal binary X and binary Y components of that symbol;
- generating an error X and error Y indication that represents the difference between the received and the ideal binary X and binary Y components;
- and
- combining the error X and error Y indications to produce a signal quality indication.
In a phase-modulated voice-band communication system wherein received phase symbols are converted into binary X and binary Y components, apparatus for detecting the occurrence of phase-jumps therein comprising:
- means for generating an error X and error Y indication that represents the difference between the binary X and binary Y components of a received symbol and the ideal binary X and binary Y components of that symbol;
- means for generating a rotated error X and rotated error Y indication that represents the difference between the binary X and binary Y components of the received symbol rotated by N degrees and the ideal binary X and binary Y components of the rotated symbol;
- and
- means for comparing the magnitude of the error X and error Y indication with the rotated error X and rotated error Y indication.
In a phase-modulated voice-band communication system wherein received phase symbols are converted into binary X and binary Y components, apparatus for producing a signal quality indication, comprising:
- means for generating an error X and error Y indication that represents the difference between the received and ideal binary X and binary Y components;
- and
- means for combining the error X and error Y indication to produce a signal quality indication.
In a phase-modulated voice-band communication system wherein received phase symbols are converted into binary X and binary Y components, apparatus for compensating for phase-jumps in the communication system, comprising:
- means for detecting the occurrence of a phase-jump;
- and
- means for correcting for the phase-jump.
In a phase-modulated voice-band communication system wherein received phase symbols are converted into binary X and binary Y components, apparatus for compensating for N degree phase-jumps in the communication line, comprising:
- means for detecting the occurrence of an N degree phase-jump;
- and
- means for modifying the binary X and binary Y components of the received symbols by N degrees.
Dependencies are inferred from the claim text.