Digital transmission over telephone channel may suffer from intersymbol interference (ISI) because of the serious distortion in the available bandwidth. One approach to solve this problem is to use adaptive equalizers. In this paper, a new design for adaptive equalizers is proposed, in which the computational complexity involved is significantiy less than that of conventional adaptive equalizers because almost all the multiplication operations involved in the latter are replaced by addition operations in the former. The key point is that by taking intermediate decisions from the received signal and using these decisions with finite possible values rather than the received signal samples to caiculate the equalized signal and to adjust the equalizer tap coefficients, muitiplications can effectively be replaced by additions.
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