Zero crossing based powerline pulse position modulated communication system

摘要

A transmitting controller is connected to an AC powerline and on command places a series of signal pulse in the powerline in a series of signal timing windows related to zero voltage crossing points so that the signal pulses are in the powerline temporal quiet zone. The receiving controller is connected to the powerline and has a filter circuit therein which filters away the powerline AC signal and noise to leave the sensed pulses. The sensed pulses are compared to zero voltage crossing points to determine in which signal timing window the pulses have occurred. Digital data is communicated over the powerline in accordance with the placement of the signal pulses related to the particular timing window.