Transceiver circuit for interfacing between a power line communication system and a data processor
First Claim
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1. A transceiver for connection between a power line and a data processing bus in a power line communication system employing amplitude shift keying modulation of broadband signals on the power line and baseband signals on the data processing bus, said transceiver comprising:
- an autocorrelation receiver connectable to said power line for receiving amplitude shift keyed signals of a carrier frequency signal, said autocorrelation receiver including digital autocorrelation means for providing an output indicative of the detection of said carrier frequency signal, digital filter means connected to said digital autocorrelation means for rejecting detected harmonics of said carrier signal in the output of said digital autocorrelation means, sampling means connected to the output of said digital filter means for sampling the output thereof at a rate which is an integral multiple of said carrier frequency signal, and digital averaging means connected to the output of said sampling means for averaging the output thereof over one period of said carrier frequency signal;
a transmitter connectable to said power line for transmitting an amplitude shift keyed signal in response to an enable signal, said transmitter including digital wave synthesizer means for generating a digital apporximation of said carrier frequency signal having minimal harmonic content; and
an interface circuit connected to receive the output of said averager means and connectable to provide an output at baseband to said data processing bus and receive an input at baseband from said data processing bus to generate said enable signal, said interface circuit including digital integrator means connected to the output of said digital averager means for integrating the output of said digital averager means over a substantial portion of an amplitude shift keying period to produce baseband signals, and gateway means connected to the output of said digital integrator means and connectable to said data processing bus for supplying baseband signals to said data processing bus and for receiving baseband signals from said data processing bus, said gateway means generating said enable signal in response to baseband signals from said data processing bus and in the absence of baseband signals from said digital integrator means.
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Abstract
A transparent transceiver interface between a broadband power line communication system and a baseband data processor includes an autocorrelation receiver. The autocorrelation receiver achieves an extremely narrow bandpass function without passive elements. The receiver accepts wideband limited signals from the power line and performs an autocorrelation test over a single cycle of the carrier frequency.
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Citations
14 Claims
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1. A transceiver for connection between a power line and a data processing bus in a power line communication system employing amplitude shift keying modulation of broadband signals on the power line and baseband signals on the data processing bus, said transceiver comprising:
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an autocorrelation receiver connectable to said power line for receiving amplitude shift keyed signals of a carrier frequency signal, said autocorrelation receiver including digital autocorrelation means for providing an output indicative of the detection of said carrier frequency signal, digital filter means connected to said digital autocorrelation means for rejecting detected harmonics of said carrier signal in the output of said digital autocorrelation means, sampling means connected to the output of said digital filter means for sampling the output thereof at a rate which is an integral multiple of said carrier frequency signal, and digital averaging means connected to the output of said sampling means for averaging the output thereof over one period of said carrier frequency signal; a transmitter connectable to said power line for transmitting an amplitude shift keyed signal in response to an enable signal, said transmitter including digital wave synthesizer means for generating a digital apporximation of said carrier frequency signal having minimal harmonic content; and an interface circuit connected to receive the output of said averager means and connectable to provide an output at baseband to said data processing bus and receive an input at baseband from said data processing bus to generate said enable signal, said interface circuit including digital integrator means connected to the output of said digital averager means for integrating the output of said digital averager means over a substantial portion of an amplitude shift keying period to produce baseband signals, and gateway means connected to the output of said digital integrator means and connectable to said data processing bus for supplying baseband signals to said data processing bus and for receiving baseband signals from said data processing bus, said gateway means generating said enable signal in response to baseband signals from said data processing bus and in the absence of baseband signals from said digital integrator means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An autocorrelation receiver for connection between a power line and a data processing bus in a power line communication system employing amplitude shift keying modulation of broadband signals on the power line and base band signals on the data processing bus, said autocorrelation receiver comprising:
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digital autocorrelation means connectable to said power line for receiving amplitude shift keyed signals of a carrier frequency signal and providing an output indicative of the detection of said carrier frequency signal; digital filter means connected to said digital autocorrelation means for rejecting detached harmonics of said carrier signal in the output of said digital autocorrelation means; sampling means connected to the output of said digital filter means for sampling the output thereof at a rate which is an integral multiple of said carrier frequency signal; and digital averaging means connected to the output of said sampling means for averaging the output thereof over one period of said carrier frequency signal. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification