A Novel Adaptive Equalizer with DCT Domain Second-Order Volterra Series for Nonlinear channel

Based on analysis of second-order Volterra series nonlinear filter, making use of continuous signal´s DCT domain second-order polynomial nonlinear filter for communication nonlinear channels, a new structure nolinear adaptive equalizer with DCT domain second-order Volterra series is proposed, and adaptive algorithm is deduced with the normalized least mean squares (NLMS). Computer simulations show that no matter what linear channel or nonlinear channel the novel structure nonlinear equalizer can availably cancel nonlinear distortions and intersymbol interference (ISI), moreover bit error rates (BER) performance also gets obviously improvement, especially reduces the number of weight coefficients.