POWER LINE COMMUNICATION WHILE AVOIDING DETERMINABLE INTERFERENCE HARMONICS

摘要

A power line communication (PLC) apparatus wherein a carrier is derived to avoid determinable interference harmonics. In order to transmit data on a power line (41) containing the television interference or other determinable interference harmonics, the present invention uses redundant carriers at a frequency between the television interference harmonics. The present invention includes a waveshaping and modulation circuit (14) for generating the modulated data waveform for output over the power line (41). In the preferred embodiment, the waveshaping and modulation circuit (14) includes a waveshape ROM (401) for storing samples that represent the appearance of the carrier waveshape. On the receive side, receive filters are used to separate the received data from determinable interference harmonics. These filters operate in cooperation with the waveshaping and modulation circuitry (14) in order to capture the signals modulated between determinable interference harmonics such as television interference harmonics.