An interference canceler comprises a first complex multiplier for multiplying a signal recovered from a quadrature modulated carrier by a first correlation value, and a second complex multiplier for multiplying a delayed version of the recovered signal by a second correlation value. The outputs of the multipliers are additively combined in an adder and subtractively combined in a subtractor. The output of the adder is amplified by an AGC amplifier to produce a reference signal representative of the envelope of the adder output. First correlation between the recovered signal and the reference signal is detected and the first correlation value is derived therefrom and second correlation is detected between the delayed version of the recovered signal and the reference signal and the second correlation value is derived therefrom. One of the outputs of the amplifier and the subtractor is selected by a selector. A decision feedback equalizer operates on the output of the selector to produce a decision output and a decision error. The decision error is compared with a threshold value and the selector is controlled depending on whether the decision error is higher or lower than the threshold value.
Time-diversity interference canceler with add/subtract/select circuit responsive to decision error