Maximization of useful-to-null subcarrier energy ratio for blind multicarrier SIMO channel shortening

We propose a blind adaptive channel shortening technique to design a time domain finite impulse response equalizer (TEQ) in multicarrier (MC) single-input, multiple-output systems. Exploiting the presence of null subcarriers in many practical MC transmission systems, the proposed approach attempts to maximize the ratio of the energy of useful subcarriers to that of the interference and noise present in null subcarrier bins. An adaptive formulation of this criterion is also developed, in order to allow the TEQ track possible channel variations. Numerical simulations are provided, illustrating the advantages of the proposed technique over recently developed blind channel shorteners.