Power-line carrier communication apparatus

The power-line communication system comprising:

• a mother unit;
• and
• a child unit for performing a communication via a power line with said mother unit;
• wherein
• said mother unit includes an AGC circuit for amplifying an entered WOFDM modulation signal to a constant level, a WOFDM demodulation circuit for demodulating said amplified WOFDM modulation signal, a WOFDM modulation circuit for WOFDM-modulating data to output a WOFDM modulation signal, an ALC circuit for amplifying the WOFDM modulation signal outputted from said WOFDM modulation circuit up to a necessary level, and a control unit containing a reception signal level detection circuit, for controlling the entire circuits including said ALC circuit and for detecting a reception signal level, and wherein
• said child unit includes a WOFDM demodulation circuit for demodulating an entered WOFDM modulation signal, a WOFDM modulation circuit for WOFDM-modulating data to output a WOFDM modulation signal, an ALC circuit for amplifying the WOFDM modulation signal outputted from said WOFDM modulation circuit of said child unit up to a necessary level, and a control unit for controlling the entire circuits of the child unit including said ALC circuit.

A powerline carrier communication apparatus comprising:

• a transmission unit;
• a reception unit;
• a power-line coupling unit for superimposing a signal derived from said transmission unit with respect to a power line as a power-line communication signal and also for extracting only a power-line communication signal from the power line;
• and
• a control unit for controlling respective structural elements of said transmission unit and of said reception unit, by which a communication operation is carried out by employing a plurality of sub-carriers;
• wherein
• said transmission unit includes a signal point mapping device for producing a plurality of bit streams from inputted transmission data so as to map said bit streams to signal points of the respective sub-carriers, a wavelet inverse transforming device for modulating the respective sub-carriers by wavelet waveforms which are orthogonal to each other based upon signal point data of the respective sub-carriers mapped by said signal point mapping device so as to produce temporal waveform series data, and a D/A converter for converting the temporal waveform series data produced by said wavelet inverse transforming device into an analog temporal waveform series signal, and wherein
• said reception unit includes an A/D converter for digitally converting the power-line communication signal extracted from the power line by said power-line coupling circuit to obtain sampling-series waveform data, a wavelet transforming device for wavelet-transforming the sampling-series waveform data obtained by said A/D converter into signal point data of respective sub-carriers, and a symbol judging device for judging bit streams mapped by a signal point mapping device of another power-line carrier communication apparatus by inverse-mapping a plurality of said signal point data outputted from said wavelet transforming device and for synthesizing the judged bit streams with each other as a reception data series.

A power-line carrier communication apparatus comprising:

• a transmission unit;
• a reception unit;
• a power-line coupling unit for superimposing a signal derived from said transmission unit with respect to a power line as a power-line communication signal and also for extracting only a power-line communication signal from the power line;
• and
• a control unit for controlling respective structural elements of said transmission unit and of said reception unit, by which a communication operation is carried out by employing a plurality of sub-carriers;
• wherein
• said transmission unit includes a signal point mapping device for producing a plurality of bit streams from inputted transmission data so as to map said bit streams to signal points of the respective sub-carriers, a wavelet inverse transforming device for modulating the respective sub-carriers by wavelet waveforms which are orthogonal to each other based upon signal point data of the respective sub-carriers mapped by said signal point mapping device so as to produce temporal waveform series data, a transmitting frequency converter for frequency-shifting the temporal waveform series data outputted from said wavelet inverse transforming device into an arbitrary carrier frequency band, and a D/A converter for converting said temporal waveform series data outputted from said transmitting frequency converter into an analog temporal waveform series signal, and wherein
• said reception unit includes an A/D converter for digitally converting the power-line communication signal extracted from the power line by said power-line coupling circuit to obtain sampling-series waveform data, a receiving frequency converter for frequency-shifting the sampling-series waveform data obtained by said A/D converter into a baseband range so as to obtain a baseband signal series, a wavelet transforming device for wavelet-transforming said baseband signal series outputted from said receiving frequency converter into signal point data of respective sub-carriers, and a symbol judging device for judging bit streams mapped by a signal point mapping device of another power-line carrier communication apparatus by inverse-mapping a plurality of said signal point data outputted from said wavelet transforming device and for synthesizing the judged bit streams with each other as a reception data series.

A power-line carrier communication apparatus comprising:

• a transmission unit;
• a reception unit;
• a power-line coupling unit for superimposing a signal derived from said transmission unit with respect to a power line as a power-line communication signal and also for extracting only a power-line communication signal from the power line;
• and
• a control unit for controlling respective structural elements of said transmission unit and of said reception unit, by which a communication operation is carried out by employing a plurality of sub-carriers;
• wherein
• said transmission unit includes a signal point mapping device for producing a plurality of bit streams from inputted transmission data so as to map said bit streams to complex signal points of the respective sub-carriers, a wavelet inverse transforming device for modulating the respective sub-carriers by wavelet waveforms which are orthogonal to each other based upon complex signal point data of the respective sub-carriers mapped by said signal point mapping device so as to produce complex temporal waveform series data, a quadrature modulating device for quadrature-modulating said complex temporal waveform series data outputted from said wavelet inverse transforming device so as to frequency-shift said complex temporal waveform series data to an arbitrary carrier frequency band, and a D/A converter for converting the complex temporal waveform series data outputted from said wavelet inverse transforming device into an analog complex temporal waveform series signal, and wherein
• said reception unit includes an A/D converter for digitally converting the power-line communication signal extracted from the power line by said power-line coupling circuit to obtain sampling-series waveform data, a quadrature demodulating device for frequency-shifting said sampling series waveform data outputted from said A/D converter into a baseband range so as to obtain a baseband signal series, a wavelet transforming device for wavelet-transforming the baseband signal series outputted from said quadrature demodulating device into signal point data of respective sub-carriers, and a symbol judging device for judging bit streams mapped by a signal point mapping device of another power-line carrier communication apparatus by inverse-mapping a plurality of said signal point data outputted from said wavelet transforming device and for synthesizing the judged bit streams with each other as a reception data series.