Landis+gyr Technologies, LLC

Landis+gyr, Inc.

Bryce D Johnson

Chad K Wolter

Stuart Haug

Paul Virden

Stuart L Haug

Aspects of the present disclosure are directed toward receiver devices and methods of using receiver devices. One such method can include converting, using an analog-to-digital converter (ADC), and an analog input signal from power distribution lines that carry power using alternating current (AC) to a digital form. This input digital signal can be an oversampled digital signal, where the digital signal is oversampled relative to downstream processing (e.g., FFT-based processing). A processing circuit(s) can then be used to decimate the input digital signal according to a decimation rate. A reference signal can be generated by the processing circuit that is responsive to the decimation rate. The processing circuit can also be used to detect a change in a phase difference between the AC and reference signal and to modify, in response to detecting a change in the phase difference, the decimation rate to counteract the detected change in the phase difference.

Digital signal processing for PLC communications having communication frequencies

In one or more embodiments, an apparatus includes a first power-line communication circuit to communicate data with a second power-line communication circuit over power lines and using a communication protocol requiring that one of the first power-line communication circuit or the second power-line communication circuit join into regular communications in response to an initiation message received over the power lines. The first power-line communication circuit communicates data regularly with the second power-line communication circuit over the power lines after being joined into regular communications by an initiation message received over the power lines, the initiation message being communicated over the power lines at an initiation time interval, the initiation time interval being based on a random interval that is within an interval range and that is based on a relative time at which at least two of the plurality of endpoint devices are designated to join within an interval range.

Initialization of endpoint devices joining a power-line communication network

Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for varying symbol amplitude. In one aspect, a system includes a symbol generator that includes a waveform generator configured to output waveforms at a plurality of selectable fundamental frequencies and with a selectable duty cycle. The symbol generator can also include a bandpass filter having a pass-band that corresponds to a communications channel of a communications network. The system can also include data processing apparatus operable to interact with the symbol generator and further operable to determine that at least a threshold number of endpoints that receive symbols from the symbol generator are experiencing a same type of transmission error. In response to the determination, the data processing apparatus can cause the waveform generator to adjust at least one of the fundamental frequency or a duty cycle of the waveforms. The fundamental frequency can be adjusted to a frequency having a harmonic that is within the pass-band.

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Breezy Point, MN, United States of America

Bryce D Johnson