A blind direct channel-shortening approach for multicarrier systems

We propose a blind adaptive channel-shortening method for designing finite-impulse response time-domain equalizers (TEQs) in single-input multiple-output systems employing multicarrier modulations. The proposed algorithm, which relies on a constrained minimization of the mean-output-energy at the TEQ output, does not require neither a priori knowledge of the channel impulse response nor transmission of training sequences. Moreover, the proposed TEQ is narrowband interference resistant and its synthesis only requires an upper bound (rather than the exact knowledge) of the channel order.