A.
          White noise is sampled from a Gaussian (0,q_d) distribution.
        </li>
        <li>
          <a href = "f_alpha_tgaussian.m">f_alpha_tgaussian.m</a>, 
          generates a discrete colored noise vector of size N with power 
          spectrum distribution of ALPHA.
          White noise is sampled from a truncated Gaussian distribution
          with zero-mean, variance Q_D, and range (-R,+R).
        </li>
        <li>
          <a href = "f_alpha_uniform.m">f_alpha_uniform.m</a>, 
     