Patent ID: 8494129

Claim:
A power-line communication apparatus for transmitting a multi-carrier signal including a plurality of sub-carriers to another communication apparatus through a power line, comprising: a phase rotation section configured to rotate phase of at least one sub-carrier among the plurality of sub-carriers, by use of a base vector; a multi-carrier signal output section configured to output a multi-carrier signal in which phase of at least one sub-carrier is rotated with the phase vector; a band setting section configured to set up at least one of a time band and a frequency band, on the basis of the multi-carrier signal, which is outputted to a power line by the multi-carrier signal output section; a communication section configured to perform communication with another communication apparatus through a power line, by use of at least one of the time band and the frequency band, which are set up by the band setting section; and a time point detection section configured to detect a time point where an alternating voltage transmitted to the power line reaches a predetermined voltage value, wherein the multi-carrier signal output section outputs the multi-carrier signal, by use of timing based on the time point detected by the time point detection section.