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We consider baseband equivalent representation of transmission circuits, inthe form of a nonlinear dynamical system $\mathbf S$ in discrete time (DT)defined by a series interconnection of a phase-amplitude modulator, a nonlineardynamical system $\mathbf F$ in continuous time (CT), and an ideal demodulator.We show that when $\mathbf F$ is a CT Volterra series model, the resulting$\mathbf S$ is a series interconnection of a DT Volterra series model of samedegree and memory depth, and an LTI system with special properties. The resultsuggests a new, non-obvious, analytically motivated structure of digitalpre-compensation of analog nonlinear distortions such as those caused by poweramplifiers in digital communication systems. The baseband model and thecorresponding digital compensation structure readily extend to OFDM modulation.MATLAB simulation is used to verify proposed baseband equivalent model anddemonstrate effectiveness of the new compensation scheme, as compared to thestandard Volterra series approach.

Baseband Equivalent Models and Digital Predistortion for Mitigating  Dynamic Continuous-Time Perturbations in Phase-Amplitude  Modulation-Demodulation Schemes (Expanded version)