Abstract
Two adaptive FIR filter configurations are proposed for implementing the LMS algorithm with no analog delay elements or multipliers. The first uses a linear feedback shift register (LFSR) to generate pseudorandom binary sequences for applications where white noise has been traditionally used. The binary signals are delayed by a shift register and multiplied by on/off switching so that the resulting structure is free of analog delay lines and multipliers. For applications where inputs are colored, the second configuration uses a sigma-delta modulator as a front-end for converting the adaptive filter's input into a binary sequence. Such a filter tends to adapt itself into a low-pass characteristic to remove the high-frequency noise due to the modulator.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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