METHODS AND APPARATUS FOR CONDITIONING COMMUNICATIONS SIGNALS BASED ON DETECTION OF HIGH-FREQUENCY EVENTS IN POLAR DOMAIN
First Claim
1. A method of processing a communications signal, comprising:
- setting a high-frequency threshold;
converting in-phase and quadrature components of a baseband signal to magnitude and phase-difference components;
detecting high-frequency events in said phase-difference component during which a rate of change of phase exceeds said high-frequency threshold; and
altering a signal trajectory of said baseband signal, in response to detected high-frequency events.
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Abstract
Methods and apparatus for conditioning communications signals based on detection of high-frequency in the polar domain. High-frequency events detected in a phase-difference component of a complex baseband signal in the polar domain are detected and used as a basis for performing hole-blowing on the complex baseband signal in the quadrature domain and/or nonlinear filtering either or both the magnitude and phase-difference components in the polar domain. Alternatively, high-frequency events detected in the phase-difference signal that correlate in time with low-magnitude events detected in a magnitude component of the complex baseband signal are used as a basis for performing hole-blowing on the complex baseband signal in the quadrature domain and/or nonlinear filtering either or both the magnitude and phase-difference components in the polar domain.
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Citations
21 Claims
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1. A method of processing a communications signal, comprising:
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setting a high-frequency threshold; converting in-phase and quadrature components of a baseband signal to magnitude and phase-difference components; detecting high-frequency events in said phase-difference component during which a rate of change of phase exceeds said high-frequency threshold; and altering a signal trajectory of said baseband signal, in response to detected high-frequency events. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus for conditioning a communications signal, comprising:
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a rectangular-to-polar converter configured to convert in-phase and quadrature components of a baseband signal to magnitude and phase components; a phase-difference calculator configured to convert said phase component to a phase-difference component; frequency detecting means configured to detect high-frequency events in said phase-difference component having a rate of change of phase exceeding a high-frequency threshold; and means for altering a signal trajectory of said baseband signal, in response to detected high-frequency events. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification