Recently, closed-form approximated
expressions were obtained for the residual Inter Symbol Interference (ISI)
obtained by blind adaptive equalizers for the biased as well as for the
non-biased input case in a noisy environment. But, up to now it is unclear
under what condition improved equalization performance is obtained in the
residual ISI point of view with the non-biased case compared with the biased
version. In this paper, we present for the real and two independent quadrature
carrier case a closed-form approximated expression for the difference in the residual
ISI obtained by blind adaptive equalizers with biased input signals compared
with the non-biased case. Based on this expression, we show under what
condition improved equalization performance is obtained from the residual ISI
point of view for the non-biased case compared with the biased version.
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