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Apparatus and methods for compensating for signal imbalance in a receiver

  • US 8,537,925 B2
  • Filed: 10/04/2011
  • Issued: 09/17/2013
  • Est. Priority Date: 11/20/2006
  • Status: Active Grant
First Claim
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1. A method for compensating for an imbalance between a first component of a data signal and a second component of the data signal, the data signal having a positive-valued frequency and being modulated by a carrier signal having a frequency error, the method comprising:

  • receiving the data and carrier signals;

    selecting a value for a time domain parameter such that a frequency domain energy corresponding to a negative-valued frequency is minimized;

    modifying in the time domain at least one of the components based on the value,estimating a carrier signal frequency corresponding to the carrier signal;

    estimating a residual carrier frequency error; and

    modifying an estimate of the carrier frequency based on the residual carrier frequency error;

    wherein the modifying in the time domain comprises;

    identifying a first value corresponding to a signal amplitude multiplier for the component; and

    identifying a second value corresponding to a phase shift for the component.

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