Abstract: A system and method involve receiving, at a processor, a phase modulated signal such as an optical or electromagnetic signal, using one or more samples of an in-phase component I(t) and a quadrature component Q(t) of the received phase modulated signal to generate, at the processor, a processed signal using the equation [A?B×I(t)]×Q(t), where A and B are numerical parameters, and inputting the processed signal into a receiver operatively connected to the processor. The processed signal may be filtered prior to being input into the receiver. Parameters A and B may be selected to vary complexity and performance of the receiver while controlling distortion for different modulation indices.

Abstract: A threshold noise-canceling method comprising the steps of: receiving an angle-modulated signal; identifying in the angle-modulated signal potential threshold noise events that exceed a first threshold value; calculating average values of the phase of the angle-modulated signal before and after a potential threshold noise event; identifying every potential threshold noise event as a threshold noise event when the difference between the corresponding before and after average values of the phase is greater than a second threshold value; and canceling out each threshold noise event by adding to the phase of the angle-modulated signal a 2? phase shift of polarity opposite to that of the corresponding threshold noise event.