Digital signal processing for PLC communications having communication frequencies
First Claim
1. A circuit-based apparatus comprising:
- a transceiver circuit configured and arranged to communicate over power distribution lines that carry power using alternating current (AC);
one or more processing circuits configured and arranged to providean analog to digital converter module configured to generate an input digital signal from an analog signal that was received at the transceiver circuit;
a decimator module configured to produce, in response to a variable decimation rate, a decimated input digital signal;
a reference signal generator module configured to generate a reference signal having a frequency responsive to the decimation rate; and
a decimation modification module configured and arranged to modify, in response to an indication of change in a phase difference between the reference signal and the AC, the decimation rate to counteract the phase difference.
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Accused Products
Abstract
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.
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Citations
18 Claims
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1. A circuit-based apparatus comprising:
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a transceiver circuit configured and arranged to communicate over power distribution lines that carry power using alternating current (AC); one or more processing circuits configured and arranged to provide an analog to digital converter module configured to generate an input digital signal from an analog signal that was received at the transceiver circuit; a decimator module configured to produce, in response to a variable decimation rate, a decimated input digital signal; a reference signal generator module configured to generate a reference signal having a frequency responsive to the decimation rate; and a decimation modification module configured and arranged to modify, in response to an indication of change in a phase difference between the reference signal and the AC, the decimation rate to counteract the phase difference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method comprising:
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converting, using an analog-to-digital converter (ADC), an analog input signal from power distribution lines that carry power using alternating current (AC) to a digital form; using a processing circuit to decimate the input digital signal according to a decimation rate; generate a reference signal that is responsive to the decimation rate; detect a change in a phase difference between the AC and reference signal; and modify, in response to detecting a change in the phase difference, the decimation rate to counteract the detected change in the phase difference. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification