Input-output identification of nonlinear channels using PSK, QAM and OFDM inputs

Nonparametric identification of baseband and passband complex Volterra systems excited by communication inputs (PSK, QAM and OFDM) is considered. Closed form expressions are established using multidimensional orthogonal polynomials and higher order statistics. First multidimensional orthogonal polynomials are used for baseband and passband Volterra models driven by PSK and QAM inputs and closed form expressions are derived. Baseband Volterra models excited by IID circular Gaussian signals (OFDM) are identified using cross-cumulants. Performance is assessed by simulations.