Patent ID: 7848460

Claim:
A method of recovering information from a composite signal including a desired signal component modulated according to a first modulation scheme and an interfering signal component modulated according to a second modulation scheme, the method comprising: applying a phase rotation associated with the second modulation scheme to the composite signal to generate a rotated signal; generating, based on the rotated signal, a channel model associated with the desired signal component and interference cancelling filter coefficients associated with the interfering signal component; filtering the rotated signal according to the interference cancelling filter coefficients to suppress the interfering signal component from the rotated signal; accumulating a squared error branch metric calculated based on the channel model, a current symbol hypothesis rotated in accordance with a difference in phase rotations associated with the first and second modulation schemes, and one or more past symbol hypotheses rotated in accordance with a difference in the phase rotations associated with the first and second modulation schemes; and estimating one or more transmitted symbols based on the accumulated squared error branch metric.