Source: http://www.google.com/patents/US6288631?dq=PCT/US01/05609
Timestamp: 2017-08-22 06:37:46
Document Index: 131748648

Matched Legal Cases: ['art 11', 'art 11', 'art 14', 'art 14', 'art 12', 'art 14', 'art 11', 'art 142', 'art 14', 'art 12', 'art 22', 'art 22', 'art 22', 'art 222', 'art 22']

Patent US6288631 - Power-line carrier communications system - Google Patents
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,...http://www.google.com/patents/US6288631?utm_source=gb-gplus-sharePatent US6288631 - Power-line carrier communications system
Publication number US6288631 B1
Application number US 09/456,495
Publication number 09456495, 456495, US 6288631 B1, US 6288631B1, US-B1-6288631, US6288631 B1, US6288631B1
Inventors Satoshi Shinozaki, Masahiro Maki, Yuji Igata
Patent Citations (6), Referenced by (61), Classifications (23), Legal Events (4)
Power-line carrier communications system
US 6288631 B1
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
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.
2. The power-line carrier communications system as claimed in claim 1, wherein said determination means calculates an average value of amplitude information and/or phase information within a predetermined threshold value 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, and then determining a value of a kth symbol according to the average value.
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
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
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
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.
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
13. The power-line carrier communications system as claimed in claim 3, wherein said modulation means modulates in an OFDM scheme, and
14. The power-line carrier communications system as claimed in claim 4. wherein said modulation means modulates in an OFDM scheme, and
15. The power-line carrier communications system as claimed in claim 5, wherein said modulation means modulates in an OFDM scheme, and
16. The power-line carrier communications system as claimed in claim 6, wherein said modulation means modulates in an OFDM scheme, and
17. The power-line carrier communications system as claimed in claim 7, wherein said modulation means modulates in an OFDM scheme, and
18. The power-line carrier communications system as claimed in claim 8, wherein said modulation means modulates in an OFDM scheme, and
19. The power-line carrier communications system as claimed in claim 9, wherein said modulation means modulates in an OFDM scheme, and
20. The power-line carrier communications system as claimed in claim 10, wherein said modulation means modulates in an OFDM scheme, and
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:
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
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.
22. The power-line carrier communications system as claimed in claim 21, wherein said determination device is operable to calculate an average value of amplitude information and/or phase information within a predetermined threshold value 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, and then determine a value of a kth symbol according to the average value.
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.
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:
calculate amplitude average and distribution values of the amplitude/phase information streams transmitted with the same carrier;
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
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:
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
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.
said demodulation device is operable to demodulate in the OFDM scheme.
32. The power-line carrier communications system as claimed in claim 22, wherein said modulation device is operable to modulate in an OFDM scheme; and
33. The power-line carrier communications system as claimed in claim 23, wherein said modulation device is operable to modulate in an OFDM scheme; and
34. The power-line carrier communications system as claimed in claim 24, wherein said modulation device is operable to modulate in an OFDM scheme; and
35. The power-line carrier communications system as claimed in claim 25, wherein said modulation device is operable to modulate in an OFDM scheme; and
36. The power-line carrier communications system as claimed in claim 26, wherein said modulation device is operable to modulate in an OFDM scheme; and
37. The power-line carrier communications system as claimed in claim 27, wherein said modulation device is operable to modulate in an OFDM scheme; and
38. The power-line carrier communications system as claimed in claim 28, wherein said modulation device is operable to modulate in an OFDM scheme; and
39. The power-line carrier communications system as claimed in claim 29, wherein said modulation device is operable to modulate in an OFDM scheme; and
40. The power-line carrier communications system as claimed in claim 30, wherein said modulation device is operable to modulate in an OFDM scheme; and
In the transmission apparatus 10, the interleave part 11 generates a plurality of symbol streams each structured by the transmitting symbols shuffled on a time axis. Thereafter, the interleave part 11 outputs these streams to the symbol differentiation part 14. The symbol differentiation part 14 converts each symbol information of the symbol streams in such a manner as to have the information correspond to a phase difference between the symbol and a preceding symbol (relative phase), and then outputs the information to the modulation part 12. As a specific example, the symbol differentiation part 14 is structured by a circuit shown in FIG. 6A. An XOR circuit 141 receives a symbol outputted from the interleave part 11 and a symbol one-symbol-delayed (that is, outputted in relation to the preceding symbol) via a delay part 142. In this manner, as exemplarily shown in FIG. 6B, the symbol differentiation part 14 outputs a symbol of “. . . 011000. . . ” with respect to the received symbol of “. . . 110100. . . ” (in FIG. 6B, an immediately-before output of the symbol is provided with a symbol “1”).
In the reception apparatus 20, when demodulating receiving signals in a corresponding manner to modulation applied in the modulation part 12 to take out amplitude/phase information in carriers, the demodulation part 22 simultaneously outputs a amplitude/phase information stream indicating how each carrier has changed with respect to a preceding symbol. In other words, the demodulation part 22 detects any delay in receiving signals. As a specific example, the demodulation part 22 is structured by a circuit shown in FIG. 6C. An XOR circuit 221 receives a demodulated symbol and a symbol which is the demodulated symbol one-symbol-delayed via a delay part 222. In this manner, the demodulation part 22 outputs, as shown in FIG. 6D, a symbol of “. . . 110100. . . ” being a phase difference from the received symbol of “. . . 1011000. . . ”.
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U.S. Classification 375/260, 370/485, 714/751, 340/310.12, 714/792, 340/12.33
International Classification H04B1/74, H04J1/00, H04B3/54, H04J11/00, H04L1/00, H03M13/27, H04L27/26
Cooperative Classification H04L27/2601, H04L1/04, H04L1/0041, H04B3/542, H04L1/0071
European Classification H04L1/04, H04L1/00B3, H04B3/54A, H04L27/26M, H04L1/00B7V
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SHINOZAKI, SATOSHI;MAKI, MASAHIRO;IGATA, YUJI;REEL/FRAME:010445/0682