Power line channel-adaptive communications system and method

A power line channel-adaptive communications method, comprising the steps of:

• generating an adaptive chirp symbol signal of a preset type for transmission data according to a channel state of the power line, modulating the generated adaptive chirp symbol signal in one of first and second transmission modes, and transmitting the modulated adaptive chirp symbol signal via the power line channel;
• controlling the type of the adaptive chirp symbol signal;
• and
• receiving the adaptive chirp symbol signal via the power line channel and restoring the transmission data by demodulating the received signal in the one of the first and second transmission modes,
• wherein the one of the first and second transmission modes is selected according to the channel state of the power line, and
• wherein transmitting the modulated adaptive chirp symbol signal comprises the steps of:
• FEC-encoding the transmission data so that errors of the transmission data can be detected and corrected;
• converting the FEC-encode data into parallel data;
• generating the adaptive chirp symbol signal of the preset type according to the channel state of the power line based on the parallel data;
• modulating the generated adaptive chirp symbol signal of the preset type in the one of the first and second transmission modes according to the channel state of the power line;
• converting the modulated signal into an analog signal;
• performing bandpass filtering on the analog signal;
• and
• amplifying the bandpass-filtered signal, and transmitting the amplified signal via the power line channel through a signal coupler.

A power line channel-adaptive communications system, comprising:

• a transmitting end for generating an extended adaptive chirp symbol signal of a preset type for transmission data according to a channel state of the power line, modulating the generated adaptive chirp symbol signal in one of first and second transmission modes, and transmitting the modulated adaptive chirp symbol signal via the power line channel;
• a channel-adaptive controller for controlling the type of the adaptive chirp symbol signal;
• and
• a receiving end for restoring the transmission data by demodulating the adaptive chirp symbol signal, received via the power line channel, in the one of the first and second transmission modes,
• wherein the one of the first and second transmission modes is selected by the channel-adaptive controller according to the channel state of the power line, and
• wherein the receiving end comprises:
• a pre-filter for pre-filtering the signal received from the power line channel through a signal coupler;
• a pre-amplifier for amplifying the pre-filtered signal;
• a channel filter for performing channel filtering on the signal amplified by the pre-amplifier;
• an Analog-to-Digital (A/D) converter for converting the channel-filtered signal into a digital signal;
• a dual transmission mode signal demodulator for demodulating the digital signal in the one of the first and second transmission modes;
• and
• an FEC decoder for restoring the transmission data by decoding the demodulated signal.