In the method of estimating a signal-to-interference+noise ratio (SINR),
either the polarities or bit values of a plurality of received data
symbol samples are estimated. Then an SINR estimate is generated based on
the plurality of received data symbol samples and the estimated
polarities or bit values of the plurality of received data symbol samples
such that the SINR estimate is not substantially dependent on the
polarities or a bit value of the plurality of received data symbol
samples.