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AssigneeMotorola Solutions, Inc.
InventorsDarrell J. Stogner, Yadunandana N. Rao, Charles R. Ruelke, Chet A. Lampert
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A method and apparatus for correcting direct current (DC) offset errors of a received signal in a direct conversion receiver (DCR) are provided. DC offset correction algorithms are incorporated into the DCR, each algorithm being optimized for a particular receive signal operating environment. The DC offset correction algorithms remove DC offset errors in baseband In-phase and Quadrature-phase signals received within the direct conversion receiver baseband signal path. Individual DC offset correction algorithms are selected for use as determined by a signal quality estimator component. A DC offset correction component of the direct conversion receiver determines an appropriate DC offset correction algorithm suited for a particular operating environment. A criterion for a signal quality estimate is set to control transitioning between DCOC algorithms. A dual threshold strategy may be adopted to transition between one DC offset correction algorithm and another DC offset correction algorithm to provide hysteresis.
A method for correcting direct current (DC) offset error of a received signal in a direct conversion receiver, the method comprising:
An apparatus for correcting direct current (DC) offset error of a received signal in a direct conversion receiver comprising a DC offset correction (DCOC) component adapted to select individual DCOC algorithms from a plurality of DCOC algorithms as determined by a signal quality estimator component, the DCOC algorithms being adapted to remove DC offset errors in baseband in-phase (I) and quadrature-phase (Q) signals received within a baseband signal path of the direct conversion receiver, wherein the DCOC component is adapted to control transitioning between the plurality of DCOC algorithms based on a set criterion for a signal quality estimate.
Dependencies are inferred from the claim text.