Implementing zero-forcing algorithm

Refer to the attached m-file plz. This is a matlab task. I want to do the comparison between the 2 algorithms. 1st one represents the BER vs SNR result when the zero-forcing equalizer is implemented. The 2nd alogorithm represents the BER vs SNR result without using zero-forcing equalizer. But when the results are compared we get exactly same BER vs SNR result. I want anybody who have worked on zero-forcing algorithm and hence he can modify the equalizer equation (used in code) so that a better BER vs SNR curve is resulted when zero-forcing algorithm is applied. I also want another algorithm to be implemented, called advance zero-forcing algorithm. The result of advance zero-forcing algorithm must be such that the better BER vs SNR curve is obtained than the simple zero-forcing algorithm. If anyone who cannot implement advance zero-forcing algorithm may also apply bid (Only a bid of USD 30 will be accepted in this case). The initial-milestone must not be greater than 50% of the bid applied. The work load is much low because the algorithm is already implemented. The expert can only apply a single correct equation in the code to get the required result.