Patent ID: 7492809

Claim:
A method comprising: receiving an input signal in a discrete-time domain by a blind speech user interference cancellation receiver for a high speed downlink packet access; separating the input signal to a desired high speed downlink packet access signal with known spreading codes and to an interfering speech user signal with unknown spreading codes using a Walsh correlator of the blind speech user interference cancellation receiver for further processing; generating a soft-decision high speed downlink packet access signal from the desired high speed downlink packet access signal using a one-stage soft-decision parallel interference cancellation receiver; generating a hard-decision high speed downlink packet access signal based on the soft-decision high speed downlink packet access signal using a hard-decision means; generating a multiple access interference signal based on the hard-decision high speed downlink packet access signal using multiple access interference estimation means of the blind speech user interference cancellation receiver; generating an adjusted signal by subtracting the multiple access interference signal from the input signal using a first adder; providing the adjusted signal to the Walsh correlator; and separating the adjusted signal to a further desired high speed downlink packet access signal with the known spreading codes and a further interfering speech user signal with the unknown spreading codes using the Walsh correlator.