Minimum delay spread TEQ design in multicarrier systems

Recently, a time-domain equalizer (TEQ) design for multicarrier-based systems has been proposed which claims to minimize the delay spread of the overall channel impulse response. We show that this is true only in an approximate sense; depending on the channel considered, the loss in delay spread with respect to the true minimum can be significant. An iterative algorithm to find this minimum is presented, whose computational complexity is similar to that of standard TEQ designs like the MSSNR approach of Melsa et al. It is observed that the method iteratively and automatically seeks the time reference yielding best performance, an advantage with respect to the MSSNR design which must compute several TEQs over a range of time references in order to select the optimum.