Power-line carrier communication apparatus

• US 8,072,323 B2
• Filed: 08/24/2010
• Issued: 12/06/2011
• Est. Priority Date: 01/24/2002
• Status: Expired due to Term

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Kodama, Nobutaka, Koga, Hisao
• Primary Examiner(s): Tweel, Jr., John A
• Application Number:
  US12/862,598
• Publication Number:
  US 20100322322A1
• Time in Patent Office: 469 Days
• Field of Search: 340/538, 340/310.11, 340/310.12, 375/219, 375/220, 375/240.18, 375/240.19
• US Class Current: 340/538
• CPC Class Codes: H04B 2203/5416 by adding signals to the wave form of the power source
• CPC Class Codes: H04B 3/54 Systems for transmission via power distribution lines
• CPC Class Codes: H04B 3/542 the information being in digital form
• CPC Class Codes: H04L 27/0004 using wavelets
• CPC Class Codes: H04L 5/0008 Wavelet-division

Abstract

The invention provides a power-line carrier communication apparatus including a transmission unit with a signal point mapping device for mapping a plurality of bit streams produced from transmission data, a wavelet inverse transforming device for modulating the respective sub-carriers by wavelet waveforms which are orthogonal to each other for producing temporal waveform series data, and a D/A converter for converting the temporal waveform series data into an analog temporal waveform series signal; and a reception unit with an A/D converter for obtaining sampling-series waveform data from a power-line communication signal, a wavelet transforming device for wavelet-transforming the sampling-series waveform data into signal point data of the respective sub-carriers, and a symbol judging device for judging bit streams mapped by the signal point mapping device by inverse-mapping a plurality of these signal point data, and for synthesizing the judged bit streams with each other as a reception data series.

Claims

1. A power-line carrier communication apparatus that performs communication by use of a plurality of sub-carriers through a power line, comprising:

a mapping section that produces bit streams from transmission data to map the bit streams to respective constellation points and allocates the respective constellation points to respective sub-carriers; and

a wavelet inverse transforming section that carries out a wavelet inverse transformation about the respective sub-carriers to produce a transmission signal,

wherein the mapping section causes at least one sub-carrier among the respective sub-carriers to be masked.

2. The power-line carrier communication apparatus as claimed in claim 1, wherein the mapping section inserts a zero with respect to at least one sub-carrier among the respective sub-carriers, thereby causing the sub-carrier to be masked.

3. The power-line carrier communication apparatus as claimed in claim 1, wherein the wavelet inverse transforming section carries out a wavelet inverse transformation by use of at least one of a lapped orthogonal transformation (LOT), a generalized lapped orthogonal transformation (GLT), and an extended modulated lapped transformation (ELT).

4. The power-line carrier communication apparatus as claimed in claim 1, wherein the wavelet inverse transforming section is configured by either one of a poly-phase filter bank circuit and a lattice structure filter bank circuit.

5. The power-line carrier communication apparatus as claimed in claim 1, further comprising:

a wavelet transforming section that carries out a wavelet transformation with respect to a reception signal, to obtain information corresponding to said bit streams; and

an inverse mapping section that inversely maps, to said bit streams, the information corresponding to the bit streams.

6. The power-line carrier communication apparatus as claimed in claim 5, wherein the wavelet transforming section carries out a wavelet transformation by use of at least one of a lapped orthogonal transformation (LOT), a generalized lapped orthogonal transformation (GLT), and an extended modulated lapped transformation (ELT).

7. The power-line carrier communication apparatus as claimed in claim 5, wherein the wavelet transforming section is configured by either one of a poly-phase filter bank circuit and a lattice structure filter bank circuit.

8. The power-line carrier communication apparatus as claimed in claim 1, further comprising:

an analog conversion section that analog-converts the transmission signal; and

a power-line superimposing section that superimpose the transmission signal that is analog-converted by the analog conversion section, with a power line.

9. The power-line carrier communication apparatus as claimed in claim 1, further comprising an arrangement control section that changes an arrangement on a complex region in which the bit streams should be mapped, on the basis of an error related to data received from another power-line carrier communication apparatus.

10. The power-line carrier communication apparatus as claimed in claim 1, further comprising:

a sub-carrier changing section that changes the sub-carrier that is masked, to another sub-carrier, on the basis of an error related to data received from another power-line carrier communication apparatus.

11. A power-line carrier communication method for performing communication by use of a plurality of sub-carriers through a power line, comprising the steps of:

producing bit streams from transmission data to map the bit streams to respective signal points to respective constellation points; and

allocating the respective constellation points to respective sub-carriers; and

carrying out a wavelet inverse transformation about the respective sub-carriers to produce a transmission signal,

wherein the mapping causes at least one sub-carrier among the respective sub-carriers to be masked.

12. A power-line carrier communication apparatus that performs communication by use of a plurality of sub-carriers through a power line, comprising:

a mapping section that produces bit streams from transmission data to map the bit streams to respective sub-carriers; and

a wavelet inverse transforming section that carries out a wavelet inverse transformation about respective sub-carriers on which the bit streams are mapped by the mapping section, to produce a transmission signal,

wherein the mapping section causes at least one sub-carrier among the respective sub-carriers to be masked.