Patent ID: 8676396
Filing Date: 2014-03-18
Classification: G01D,G06F,H02J,Y02B,Y04S

Abstract:
1. A method comprising: receiving with a controller at a destination node signal samples and associated sampling time indications, the signal samples and the associated sampling time indications being received from a source node via a mesh network, the signal samples being delivered with sampling time indications generated at the source node to form a series of signals corresponding to one or more characteristic(s) related to electricity supplied to one or more electrical devices from a power source; applying with the controller a compacting algorithm to the received signal samples and the received associated sampling time indications to generate a paired vector comprising compacted signal samples and an associated compacted sampling time indication; transforming the paired vector representing the compacted sampled signal in a time domain into a discrete Fourier spectrum of the signal in the frequency domain using an Approximate Fourier Transform such that the discrete Fourier spectrum of the compacted sampled signal is uniformly sampled in the frequency domain; applying a filter in the frequency domain to the discrete Fourier spectrum of the signal to generate a filtered discrete spectral representation; applying an inverse discrete Fourier transform to the filtered discrete spectral representation to generate a recovered signal in the time domain that is uniformly sampled; extrapolating future values of the recovered signal in the time domain by setting the time basis in the inverse discrete Fourier transform to be greater than the total age of the compacted source signal; and providing an adjustment signal based on the extrapolated future values to compensate for a group delay of the filter.