Power-line carrier communications system
First Claim
1. A power-line carrier communications system in which a power-line is used for a transmission path, and a symbol is transmitted from a transmitting apparatus to a reception apparatus, whereinsaid transmission apparatus comprises:
- interleave means for shuffling m symbols (where m is an integer of 2 or more) in a unit of symbol stream in n ways (where n is an integer of 2 or more) and generating n-type symbol streams in which 1st to mth symbols are shuffled;
modulation means for subjecting said n-type symbol streams generated by said interleave means to amplitude-modulation and/or phase-modulation in such a manner as to randomly distribute each symbol on both time and frequency axes by using predetermined carriers each corresponding thereto, and outputting the same as modulated signals; and
transmission amplifier means for amplifying said modulated signals to be in a predetermined amplitude, and outputting the same to said transmission path, and said reception apparatus comprises;
reception amplifier means for amplifying, to be in a predetermined amplitude, and outputting the modulated signals received through said transmission path;
demodulation means for subjecting the modulated signals outputted from said reception amplifier means to amplitude-modulation and/or phase-demodulation by using predetermined reference carriers each corresponding thereto, and then generating n-type amplitude/phase information streams;
de-interleave means for unshuffling the symbols in said n-type amplitude/phase information streams generated by said demodulation means in an inverse manner to the interleave means, and then outputting the unshuffled n-type amplitude/phase information streams; and
determination means for determining a value respectively for said 1st to mth symbols according to each information on said unshuffled n-type amplitude/phase information streams outputted from said de-interleave means.
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Accused Products
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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Citations
40 Claims
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1. A power-line carrier communications system in which a power-line is used for a transmission path, and a symbol is transmitted from a transmitting apparatus to a reception apparatus, wherein
said transmission apparatus comprises: -
interleave means for shuffling m symbols (where m is an integer of 2 or more) in a unit of symbol stream in n ways (where n is an integer of 2 or more) and generating n-type symbol streams in which 1st to mth symbols are shuffled;
modulation means for subjecting said n-type symbol streams generated by said interleave means to amplitude-modulation and/or phase-modulation in such a manner as to randomly distribute each symbol on both time and frequency axes by using predetermined carriers each corresponding thereto, and outputting the same as modulated signals; and
transmission amplifier means for amplifying said modulated signals to be in a predetermined amplitude, and outputting the same to said transmission path, and said reception apparatus comprises;
reception amplifier means for amplifying, to be in a predetermined amplitude, and outputting the modulated signals received through said transmission path;
demodulation means for subjecting the modulated signals outputted from said reception amplifier means to amplitude-modulation and/or phase-demodulation by using predetermined reference carriers each corresponding thereto, and then generating n-type amplitude/phase information streams;
de-interleave means for unshuffling the symbols in said n-type amplitude/phase information streams generated by said demodulation means in an inverse manner to the interleave means, and then outputting the unshuffled n-type amplitude/phase information streams; and
determination means for determining a value respectively for said 1st to mth symbols according to each information on said unshuffled n-type amplitude/phase information streams outputted from said de-interleave means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
calculates an amplitude average value of the amplitude/phase information streams transmitted with the same carrier, calculates relative amplitude information for said amplitude average value, determines a degree of reliability based on whether or not a value of said relative amplitude information is within a predetermined range, and calculates an average value by using only reliable amplitude information and/or phase information, and then determines a value of a kth symbol according to the average value. -
4. The power-line carrier communications system as claimed in claim 1, wherein, from kth (where k is an integer equal to or less than m) amplitude information and/or phase information in said unshuffled n-type amplitude/phase information streams, said determination means
calculates amplitude average and distribution values of the amplitude/phase information streams transmitted with the same carrier, calculates relative amplitude information for said amplitude average value, determines a degree of reliability based on whether or not an absolute value of said relative amplitude information is smaller than an absolute value obtained by multiplying said distribution value by a predetermined constant, and calculates an average value by using only reliable amplitude information and/or phase information, and then determines a value of a kth symbol according to the average value. -
5. The power-line carrier communications system as claimed in claim 1, wherein, from kth (where k is an integer equal to or less than m) amplitude information and/or phase information in said unshuffled n-type amplitude/phase information streams, said determination means
determines a degree of reliability whether or not a difference between an amplitude value of symbol the amplitude/phase information streams transmitted and an amplitude value of a preceding symbol, with the same carrier, is within a predetermined value, and calculates an average value by using only reliable amplitude information and/or phase information, and then determines a value of a kth symbol according to the average value. -
6. The power-line carrier communications system as claimed in claim 1, wherein said symbol stream having 1st to mth symbols in said interleave means is equal to or less than a half power-supply cycle time.
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7. The power-line carrier communications system as claimed in claim 2, wherein said symbol stream having 1st to mth symbols in said interleave means is equal to or less than a half power-supply cycle time.
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8. The power-line carrier communications system as claimed in claim 3, wherein said symbol stream having 1st to mth symbols in said interleave means is equal to or less than a half power-supply cycle time.
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9. The power-line carrier communications system as claimed in claim 4, wherein said symbol stream having 1st to mth symbols in said interleave means is equal to or less than a half power-supply cycle time.
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10. The power-line carrier communications system as claimed in claim 5, wherein said symbol stream having 1st to mth symbols in said interleave means is equal to or less than a half power-supply cycle time.
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11. The power-line carrier communications system as claimed in claim 1, wherein said modulation means modulates in an OFDM scheme, and
said demodulation means demodulates in the OFDM scheme. -
12. The power-line carrier communications system as claimed in claim 2, wherein said modulation means modulates in an OFDM scheme, and
said demodulation means demodulates in the OFDM scheme. -
13. The power-line carrier communications system as claimed in claim 3, wherein said modulation means modulates in an OFDM scheme, and
said demodulation means demodulates in the OFDM scheme. -
14. The power-line carrier communications system as claimed in claim 4. wherein said modulation means modulates in an OFDM scheme, and
said demodulation means demodulates in the OFDM scheme. -
15. The power-line carrier communications system as claimed in claim 5, wherein said modulation means modulates in an OFDM scheme, and
said demodulation means demodulates in the OFDM scheme. -
16. The power-line carrier communications system as claimed in claim 6, wherein said modulation means modulates in an OFDM scheme, and
said demodulation means demodulates in the OFDM scheme. -
17. The power-line carrier communications system as claimed in claim 7, wherein said modulation means modulates in an OFDM scheme, and
said demodulation means demodulates in the OFDM scheme. -
18. The power-line carrier communications system as claimed in claim 8, wherein said modulation means modulates in an OFDM scheme, and
said demodulation means demodulates in the OFDM scheme. -
19. The power-line carrier communications system as claimed in claim 9, wherein said modulation means modulates in an OFDM scheme, and
said demodulation means demodulates in the OFDM scheme. -
20. The power-line carrier communications system as claimed in claim 10, wherein said modulation means modulates in an OFDM scheme, and
said demodulation means demodulates in the OFDM scheme.
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21. A power-line carrier communications system in which a power-line is used for a transmission path, and a symbol is transmitted from a transmission apparatus to a reception apparatus, wherein:
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said transmission apparatus comprises;
interleave device operable to shuffle m symbols (where m is an integer of 2 or more) in a unit of symbol stream in n ways (where n is an integer of 2 or more) and generate n-type symbol streams in which 1st to mth symbols are shuffled;
modulation device operable to subject the n-type symbol streams generated by said interleave device to amplitude-modulation and/or phase-modulation in such a manner as to randomly distribute each symbol on both time and frequency axes by using predetermined carriers each corresponding thereto, and outputting the same as modulated signals; and
transmission amplifier device operable to amplify the modulated signals to be in a predetermined amplitude, and output the same to said transmission path; and
said reception apparatus comprises;
reception amplifier device operable to amplify, to be in a predetermined amplitude, and output the modulated signals received through said transmission path;
demodulation device operable to subject the modulated signals outputted from said reception amplifier device to amplitude-modulation and/or phase-demodulation by using predetermined reference carriers each corresponding thereto, and then generating n-type amplitude/phase information streams;
de-interleave device operable to unshuffle the symbols in the n-type amplitude/phase information streams generated by said demodulation device in an inverse manner to the interleave device, and then output the unshuffled n-type amplitude/phase information streams; and
determination device operable to determine a value respectively for the 1st to mth symbols according to each information on the unshuffled n-type amplitude/phase information streams outputted from said de-interleave device. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
calculate an amplitude average value of the amplitude/phase information streams transmitted with the same carrier, calculate relative amplitude information for the amplitude average value;
determine a degree of reliability based on whether or not a value of the relative amplitude information is within a predetermined range; and
calculate an average value by using only reliable amplitude information and/or phase information, and then determine a value of a kth symbol according to the average value.
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24. The power-line carrier communications system as claimed in claim 21, wherein, from kth (where k is an integer equal to or less than m) amplitude information and/or phase information in the unshuffled n-type amplitude/phase information streams, said determination device is operable to:
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calculate amplitude average and distribution values of the amplitude/phase information streams transmitted with the same carrier;
calculate relative amplitude information for the amplitude average value;
determine a degree of reliability based on whether or not an absolute value of the relative amplitude information is smaller than an absolute value obtained by multiplying the distribution value by a predetermined constant; and
calculate an average value by using only reliable amplitude information and/or phase information, and then determine a value of a kth symbol according to the average value.
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25. The power-line carrier communications system as claimed in claim 21, wherein, from kth (where k is an integer equal to or less than m) amplitude information and/or phase information in the unshuffled n-type amplitude/phase information streams, said determination device is operable to:
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determine a degree of reliability whether or not a difference between an amplitude value of symbol the amplitude/phase information streams transmitted and an amplitude value of a preceding symbol, with the same carrier, is within a predetermined value; and
calculate an average value by using only reliable amplitude information and/or phase information, and then determine a value of a kth symbol according to the average value.
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26. The power-line carrier communications system as claimed in claim 21, wherein the symbol stream having 1st to mth symbols in said interleave device is equal to or less than a half power-supply cycle time.
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27. The power-line carrier communications system as claimed in claim 22, wherein the symbol stream having 1st to mth symbols in said interleave device is equal to or less than a half power-supply cycle time.
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28. The power-line carrier communications system as claimed in claim 23, wherein the symbol stream having 1st to mth symbols in said interleave device is equal to or less than a half power-supply cycle time.
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29. The power-line carrier communications system as claimed in claim 24, wherein the symbol stream having 1st to mth symbols in said interleave device is equal to or less than a half power-supply cycle time.
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30. The power-line carrier communications system as claimed in claim 25, wherein the symbol stream having 1st to mth symbols in said interleave device is equal to or less than a half power-supply cycle time.
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31. The power-line carrier communications system as claimed in claim 21, wherein said modulation device is operable to modulate in an OFDM scheme;
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said demodulation device is operable to demodulate in the OFDM scheme.
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32. The power-line carrier communications system as claimed in claim 22, wherein said modulation device is operable to modulate in an OFDM scheme;
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said demodulation device is operable to demodulate in the OFDM scheme.
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33. The power-line carrier communications system as claimed in claim 23, wherein said modulation device is operable to modulate in an OFDM scheme;
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said demodulation device is operable to demodulate in the OFDM scheme.
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34. The power-line carrier communications system as claimed in claim 24, wherein said modulation device is operable to modulate in an OFDM scheme;
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said demodulation device is operable to demodulate in the OFDM scheme.
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35. The power-line carrier communications system as claimed in claim 25, wherein said modulation device is operable to modulate in an OFDM scheme;
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said demodulation device is operable to demodulate in the OFDM scheme.
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36. The power-line carrier communications system as claimed in claim 26, wherein said modulation device is operable to modulate in an OFDM scheme;
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said demodulation device is operable to demodulate in the OFDM scheme.
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37. The power-line carrier communications system as claimed in claim 27, wherein said modulation device is operable to modulate in an OFDM scheme;
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said demodulation device is operable to demodulate in the OFDM scheme.
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38. The power-line carrier communications system as claimed in claim 28, wherein said modulation device is operable to modulate in an OFDM scheme;
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said demodulation device is operable to demodulate in the OFDM scheme.
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39. The power-line carrier communications system as claimed in claim 29, wherein said modulation device is operable to modulate in an OFDM scheme;
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said demodulation device is operable to demodulate in the OFDM scheme.
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40. The power-line carrier communications system as claimed in claim 30, wherein said modulation device is operable to modulate in an OFDM scheme;
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said demodulation device is operable to demodulate in the OFDM scheme.
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Specification