Radio receiver having an adaptive equalizer and method therefor

In a radio receiver that generates an intermediate frequency (IF) signal, an equalizer having an input receiving the IF signal and an output for providing an interference-reduced intermediate frequency (IF) signal comprising:

• a first tap circuit having a first input coupled to the input of the equalizer, a second input, and an output coupled to the output of the equalizer;
• an error generator having an input coupled to the output of the tap circuit, and an output;
• a first multiplier having a first input coupled to output of error generator, a second input coupled to the input of the equalizer, and an output;
• and
• a first infinite impulse response (IIR) filter circuit having an input coupled to the output of the first multiplier and an output coupled to the second input of the first tap circuit.

In a radio receiver that generates an intermediate frequency (IF) signal, an equalizer having an input receiving the IF signal and an output for providing an interference-reduced intermediate frequency (IF) signal comprising:

• a plurality of tap circuits each having a first input coupled to the input of the equalizer, a second input, and an output coupled to the output of the equalizer;
• an error generator having an input coupled to the outputs of the plurality of tap circuits, and an output;
• a plurality of multipliers each having a first input coupled to output of the error generator, a second input coupled to the input of the equalizer, and an output;
• and
• a plurality of infinite impulse filter (IIR) circuits, each corresponding to a multiplier of the plurality of multipliers and to a tap circuit of the plurality of tap circuits and having an input coupled to the output of the multiplier to which it corresponds and an output coupled to the second input of the tap circuit to which it corresponds.

In a radio receiver that generates an intermediate frequency (IF) signal, a method for providing an interference-reduced IF signal comprising:

• filtering the IF signal using tap values;
• generating an error signal responsive to the interference-reduced IF signal;
• and
• updating the tap values in response to the error signal and the IF signal by infinite impulse response filtering.