Response to the following problem:
Determine the tap weight coefficients of a three-tap zero-forcing equalizer if the ISI spans three symbols and is characterized by the values x(0) = 1, x(-1) = 0.3, x(1) = 0.2. Also determine the residual ISI at the output of the equalizer for the optimum tap coefficients.
Make sure you use enough details to support your answer.