Design of Multilevel Pseudorandom Signals for Specified Harmonic Content

Pseudorandom signals have been used in system identification for many years, usually in their binary form, usually for the identification of linear systems and usually because of their correlation propemes.' Pseudorandom binary signals are unsuitable for the identification of nonlinear systems but pseudorandom ternary signals have been used for the purpose, exploiting their higher-order correlation properties.2 In contrast, system identification exploiting the harmonic properties of pseudorandom signals has received considerably less attention, although the author has described how these properties can be used in the identification of both linear