Patent ID: 7498935

Claim:
A power-line transmission apparatus comprising: a transmission 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 a control unit for controlling respective structural elements of said transmission unit, by which a transmission 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.