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 data over power distribution lines that carry power using alternating current (AC); and
a logic circuit configured and arranged togenerate an input digital signal from an analog signal received at the transceiver circuit,produce, in response to a variable decimation rate, a decimated input digital signal, andin response to an indication of change in a phase difference between a reference signal and the AC, control the decimation rate to counteract the phase difference; and
a reference signal generator module configured to generate the reference signal having a frequency responsive to the decimation rate, and wherein the reference signal generator module is configured and arranged to generate the reference signal using a direct digital synthesizer.
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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
20 Claims
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1. A circuit-based apparatus comprising:
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a transceiver circuit configured and arranged to communicate data over power distribution lines that carry power using alternating current (AC); and a logic circuit configured and arranged to generate an input digital signal from an analog signal received at the transceiver circuit, produce, in response to a variable decimation rate, a decimated input digital signal, and in response to an indication of change in a phase difference between a reference signal and the AC, control the decimation rate to counteract the phase difference; and a reference signal generator module configured to generate the reference signal having a frequency responsive to the decimation rate, and wherein the reference signal generator module is configured and arranged to generate the reference signal using a direct digital synthesizer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. 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; and using a logic circuit to decimate the input digital signal according to a decimation rate, detect a change in a phase difference between the AC and a reference signal, and control, in response to detecting a change in the phase difference, the decimation rate to counteract the detected change in the phase difference, wherein using a logic circuit further includes generating the reference signal by setting a frequency of the reference signal to a value that correlates virtual carrier channel frequencies for the frequency of the reference signal with the decimation rate. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A circuit-based apparatus comprising:
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a transceiver circuit configured and arranged to communicate data over power distribution lines that carry power using alternating current (AC); a logic circuit configured and arranged to generate an input digital signal from an analog signal received at the transceiver circuit, produce, in response to a variable decimation rate, a decimated input digital signal, in response to an indication of change in a phase difference between a reference signal and the AC, control the decimation rate to counteract the phase difference, and set the decimation rate, per each period of the AC or each symbol period, to a fixed number of FFT input samples. - View Dependent Claims (20)
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Specification