A Microprocessor-Oriented Algorithm for Adaptive Equalization

Adaptive equalization based on a transversal filter is extremely important for reliable data transmission over the voiceband telephone lines. Unfortunately, implementation of rapidly converging and small residual distortion algorithms on the standard MOS microprocessors or standard-cell MOS VLSI chips is difficult because of their mathematical complexity. In this paper, an adaptive equalization algorithm is proposed which is suitable for cost-effective implementation on MOS microprocessors and standard-cell MOS VLSI chips. It is based on the same principle of delayed decision that was used successfully in delta modulation. It involves no multiplications or analog-to-digital conversion, but is relatively fast and provides a relatively low residual distortion. The proposed algorithm is simulated in both noise-free and noisy environments and is compared to two well-known classical algorithms.