Power-line carrier communications system
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United States of America Patent
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Sep 11, 2001
Grant Date -
N/A
app pub date -
Dec 8, 1999
filing date -
Dec 8, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
An object of the present invention is to provide a reliable power-line carrier communications system having a resistance to high-level impulse noise synchronized with power-cycle frequency in virtue of redundancy on both time and frequency axes. An interleave part (11) shuffles, in n interleaving ways, transmitting symbols in a unit of symbol stream of the same length as a noise cycle. A modulation part (12) modulates the n-type symbol streams with n-piece carriers. A demodulation part (22) extracts amplitude/phase information from each of the n-piece carriers, and then outputs the information as amplitude/phase information streams. A de-interleave part (23) unshuffles the amplitude/phase information streams. A determination part (24) determines a symbol value from amplitude/phase information values in the same timing in the amplitude/phase information streams, and then outputs the values in a receiving symbol stream.
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