Method of and system for power line carrier communications
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United States of America Patent
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Nov 6, 1990
Grant Date -
N/A
app pub date -
Apr 26, 1989
filing date -
Apr 26, 1989
priority date (Note) -
Expired
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Abstract
The transmitter in a power line communications system applies to the power line encoded logical-one and logical-zero bit signals consisting of signals formed respectively of predetermined different sequences of frequencies. The receiver, coupled to the power line, includes a first homodyne, non-coherent, quadratic demodulator for demodulating the logical-one bits and a second for demodulating the logical-zero bits. The first demodulator produces, locally, and in first and second channels, respectively, a first reference signal that is a replica of the logical-one bit sequence of frequencies and a second reference signal that is the replica in quadrature. The second demodulator produces, locally, and in third and fourth channels, respectively, cooresponding third and fourth reference signals for the logical-zero bit sequence. Each of the four reference signals is applied to a corresponding analog multiplier for multiplication by the input signal in each channel. The output of each multiplier is applied to a low pass filter that passes only the dc component of the product signal which in turn is squared. The resultant signals in the first and second channels are summed to provide a first output signal, and the resultant signals in the third and fourth channels are summed to provide a second output signal. Compensation circuitry cancels error voltages developed in the demodulatin channels as a result of component offset, and the two output signals are integrated over a bit period and then compared to each other to detect a logical-one or logical-zero bit.
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- 15 United States
- 10 France
- 8 Japan
- 7 China
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Patent Owner(s)
- ITRON, INC.
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
LaPorte, Eric | Roswell, GA | 2 | 235 |
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Fee | Large entity fee | small entity fee | micro entity fee |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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