Efficient Decision Feedback Equalisation of Nonlinear Volterra Channels

Intersymbol interference caused by nonlinear channel imperfections can be reduced by a Decision Feedback Equaliser (DFE). The desire to eliminate the need for a tentative decision that arises in the nonlinear channel DFE has led to the development of root finding methods for obtaining the correct symbols in such equalisers. This chapter offers several further developments to this approach. An a priori root selection method suitable for up to 3rd order nonlinear Volterra channels is given. An analysis of the conditions for monotonicity of Volterra channels is presented. Finally, an efficient symbol decision method suitable for general Nth order nonlinear channels using a modified form of the bisection method is developed.

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