US 2006/0138862 A1 · Communication apparatus and communication method

Abstract

A communication apparatus includes a transmission signal generation section 1, a transmission signal control section 2, a transmission section 3, a leakage electric power detection section 4, and an electric power control judgment section 5. The transmission signal generation section 1 generates a transmission signal for carrying out transmission using a plurality of sub-carriers, under control of the transmission signal control section 2, and has a transmission electric power control function with respect to each sub-carrier. The leakage electric power detection section 4 detects electric power which is leaked from a transmission line 9 among transmission electric power. The electric power control judgment section 5 judges necessity of transmission electric power control by the transmission signal control section 2, on the basis of a leakage electric power signal from the leakage electric power detection section 4, and in case that it was judged that transmission electric power control is necessary, it notifies that effect to the transmission signal control section 2. The transmission signal control section 2 controls transmission electric power of a sub-carrier, on the basis of the leakage electric power signal from the leakage electric power detection section 4.

Claims21

Dependent claims

A communication apparatus which transmits a transmission signal using a plurality of sub-carriers through a power line, comprising:

an unbalanced component detection section which detects an unbalanced component that corresponds to electromagnetic radiation from said power line, and
an electric power control judgment section which calculates leakage electric power values in a frequency band that corresponds to all or a part of said sub-carriers, on the basis of unbalanced component signal detected by said unbalanced component detection section, and compares the calculated leakage electric power value corresponding to at least one sub-carrier with a first threshold value, and compares the calculated leakage electric power value corresponding to at least one sub-carrier with a second threshold value which is lower than said first threshold value, and judges whether electric power control of said transmission signal is necessary or not, on the basis of these comparison results.

Dependencies are inferred from the claim text.

Communication apparatus and communication method

Life of this patent

Communication apparatus and communication method

Life of this patent

Abstract

Claims21