1. A method, comprising: calculating a plurality of estimates of phase error for an input signal, wherein the plurality of estimates are for a constellation of points used by a modulation technique; calculating 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 a first sum of the plurality of weighted estimates by a second sum of the plurality of weights to determine a composite estimate of phase error.