Patent ID: 7173966

Claim:
A multi-band equalizer for a modem receiver, comprising: a self-interference canceling filter for receiving an input signal, for removing from the input signal cross correlation terms resulting from input signal self-interference and for providing a corrected input signal, the self-interference canceling filter comprising a fixed tap-weight filter bank for filtering the input signal, a weighting circuit for weighting the filtered input signal with a pre-determined function of a differential phase angle between adjacent subbands of the input signal, and a subtraction circuit for subtracting the weighted, filtered input signal from the input signal to generate the corrected input signal; a quantizer for quantizing the corrected input signal and for providing a quantizer error signal based upon a difference between the corrected input signal and the quantized, corrected input signal; and a feedback circuit for calculating a proportional phase correction metric from the quantizer error signal and for providing phase values for plural subbands, derived from the proportional phase correction metric, to the self-interference canceling filter.