Error analysis of a demodulation procedure for multicarrier signals with slowly-varying carriers

We propose a procedure to demodulate analog signals encoded by a multicarrier modulator, with slowly-varying carrier shapes. We prove that the asymptotic demodulation error can be made arbitrarily small. The intended application is the “sensorless” control of AC electric motors at or near standstill, through the decoding of the PWM-induced current ripple.