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% zero forcing equalization
   hM = toeplitz([ht([2:end]) zeros(1,2*K+1-L+1)], [ ht([2:-1:1]) zeros(1,2*K+1-L+1) ]);
   d  = zeros(1,2*K+1);
   d(K+1) = 1;
   c_zf  = [inv(hM)*d.'].';
   yFilt_zf = conv(y,c_zf);
   yFilt_zf = yFilt_zf(K+2:end);
   yFilt_zf = conv(yFilt_zf,ones(1,1)); % convolution
   ySamp_zf = yFilt_zf(1:1:N);  % sampling at time T

   % mmse equalization
   hAutoCorr = conv(ht,fliplr(ht));
   hM = toeplitz([hAutoCorr([3:end]) zeros(1,2*K+1-L)], [ hAutoCorr([3:end]) zeros(1,2*K+1-L) ]);
   hM = hM + 1/2*10^(-Eb_N0_dB(ii)/10)*eye(2*K+1);
   d  = zeros(1,2*K+1);
   d([-1:1]+K+1) = fliplr(ht);
   c_mmse  = [inv(hM)*d.'].';
   yFilt_mmse = conv(y,c_mmse);
   yFilt_mmse = yFilt_mmse(K+2:end);
   yFilt_mmse = conv(yFilt_mmse,ones(1,1)); % convolution
   ySamp_mmse = yFilt_mmse(1:1:N);  % sampling at time T
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