Radio receiver having an adaptive equalizer and method therefor

In a radio receiver that generates digitized signal, a method for providing an interference-reduced digitized signal comprising:

• performing filtering of the digitized signal to produce a filtered digitized signal;
• generating a plurality of error messages;
• using an IIR filter for updating tap values of an equalizer in response to the plurality of error messages and the filtered digitized signal, wherein a previous error message of the plurality of error messages is weighted up by a value (m) and a current error message or the plurality of error messages is weighted up by a value 1−m, the current error message being summed with the previous error message to produce an averaged-over-time error message for updating tap values of the tap undate circuit;
• and
• performing filtering of the filtered digitized signal to produce the interference-reduced signal.

In a radio receiver that generates a digitized signal, an equalizer having an input for receiving the digitized signal and an output for providing an interference-reduced digitized 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;
• wherein the error generator provides error messages to the first IIR filter circuit, and wherein a previous error message of the error messages is weighted up by a value (m) and a current error message of the error messages is weighted up by a value 1−m, the current error message being summed with the previous error message to produce an averaged-over-time error message for updating tap values of the tap update circuit.

In a radio receiver that generates a digitized signal, an equalizer having an input receiving the digitized signal and an output for providing an interference-reduced digitized 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;
• wherein the error generator provides error messages to the plurality of IIR filter circuits, and wherein a previous error message of the error messages is weighted up by a value (m) and a current error message of the error messages is weighted up by a value 1−m, the current error message being summed with the previous error message to produce an averaged-over-time error message for updating tap values of the plurality of tap circuits.

In a radio receiver that generates a digitized signal, a method for providing an interference-reduced digitized signal comprising:

• filtering the digitized signal using an equalizer having a plurality of taps;
• generating a plurality of error messages responsive to the interference-reduced digitized signal, wherein a previous error message of the plurality of error messages is weighted up by a value (m) and a current error message of the plurality of error messages is weighted up by a value 1−m, the current error message being summed with the previous error message to produce an averaged-over-time error message;
• and
• updating a plurality of tap values of the equalizer in response to the averaged-over-time error message and the IF signal.