Phase error detection with conditional probabilities

An apparatus, comprising:

• an estimator to determine estimates of phase error for an input signal, wherein the estimates are referenced to a constellation of points;
• a probability determiner to determine weights of probabilities for the estimates of phase error;
• and
• an error calculator to calculate a composite error of phase for the input signal based on the estimates of phase error and the weights of probabilities, wherein the composite error comprises a quotient of a numerator and a denominator, wherein further the numerator comprises a first sum of products of the estimates of phase error and the weights of probabilities, wherein further the denominator comprises a second sum of the weights of probabilities.

A system, comprising:

• a tuner to generate in-phase (“I”) and quadrature-phase (“Q”) components of an input signal;
• a demodulator to demodulate the input signal;
• and
• a phase error detector to detect a composite error of phase of the input signal with reference to a constellation of points, wherein the composite error comprises a quotient of a numerator and a denominator, wherein further the numerator comprises a first sum of products of estimates of phase error and weights of probabilities associated with the estimates, wherein further the denominator comprises a second sum of the weights of probabilities.

A machine-accessible medium containing instructions, which when executed by a machine, cause said machine to perform operations, comprising:

• computing a plurality of estimates of phase error for an input signal, wherein the plurality of estimates is for a constellation of points;
• computing a plurality of weights of conditional probabilities that correspond to the estimates of phase error;
• multiplying individual estimates of phase error with individual weights to produce a plurality of weighted estimates;
• and
• dividing the plurality of weighted estimates by a sum of the plurality of weights to determine a composite estimate of phase error.