Communication over power lines
First Claim
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1. A power line carder telecommunication apparatus, comprising:
- tuned interface means for connection to a power line for transmission and reception of messages and having a timed resonant frequency;
tramsmission means connected to the tuned interface means for transmitting a first frequency selected to be below the tuned resonant frequency for a first data clock period to indicate the transmission of a data separator; and
the transmission means further for transmitting a second frequency selected to be above the tuned resonant frequency having a second data clock period to indicate the transmission of a logical ZERO andh having a third data clock period to indicate the transmission of a logical ONE.
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Abstract
The present invention describes an FSK carrier communication systems for transmitting and receiving data on a electric utility line even in the presence of extreme noise. The present invention uses a unique FSK transmit and receive protocol to distinguish between noise and actual data. By careful selection of the space and mark frequencies transmitted on the power line and by using a unique variable width data-bit protocol, the receiver can distinguish between actual data and corrupted information due to noise spikes with nearly error free communication.
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4 Claims
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1. A power line carder telecommunication apparatus, comprising:
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tuned interface means for connection to a power line for transmission and reception of messages and having a timed resonant frequency; tramsmission means connected to the tuned interface means for transmitting a first frequency selected to be below the tuned resonant frequency for a first data clock period to indicate the transmission of a data separator; and the transmission means further for transmitting a second frequency selected to be above the tuned resonant frequency having a second data clock period to indicate the transmission of a logical ZERO andh having a third data clock period to indicate the transmission of a logical ONE.
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2. A method of communicating information over a power line, comprising the steps of:
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placing a polling message on the power line; receiving the polling message from the power line and transmitting the information in response thereto, comprising the substeps of; transmitting a first frequency for a first data clock period to indicate the transmission of a data separator; transmitting a second frequency for a second data clock period following the first data clock period to indicate the transmission of a logical ONE; and transmitting the second frequency for a third data clock period following the first data clock period to indicate the transmission of a logical ONE.
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3. A method of encoding data for serial communication of information over a power line, the power line having an alternating current frequency, comprising the steps of:
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assigning a tuned resonant frequency selected to be higher than the alternating current frequency on the power line; assigning a data clock period having a duration selected to be in excess of the time period of noise spikes on the power line; assigning a first frequency to correspond to a local ZERO which is selected to be lower than the tuned resonant frequency; assigning a second frequency to correspond to a logical ONE which is selected to be higher than the tuned resonant frequency; assigning a decision frequency to discriminate between a logical ONE and logical ZERO such that a received frequency below the decision frequency is decoded as a logical zero and such that a received frequency above the decision frequency is decoded as a logical ONE, the decision frequency selected to be between the tuned resonant frequency and the first frequency; transmitting the first frequency for one data clock period followed by no signal in the next data clock period to indicate the transmission of a logical ZERO; and transmitting the second frequency for two data dock periods followed by no signal for the next data dock period to indicate the transmission of the logical ONE. - View Dependent Claims (4)
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Specification