Cross-frequency-band power-line carrier communication system and communication method thereof

Abstract

The invention relates to a cross-frequency-band power-line carrier communication system and a communication method thereof. The system includes a power-line carrier machine connected with a power line. The power-line carrier machine includes an analog front end which is used for power amplifying output of sending signals and filtering, conditioning and automatic gain controlling of received signals. The analog front end includes an MCU (micro controller unit) and a carrier channel, which are connected in order. The system is capable of realizing full duplex communication and full-band power-line carrier communication at a frequency-band range of 30kHZ to 20 MHZ. The invention also provides a communication method for the field of electric-power communication. The system expands a usable spectral bandwidth to 30kHz to 20 MHz so that the usable bandwidth is much wider than bandwidths of analog front ends of the prior carrier machines and thus channel bandwidth of the power-line carrier communication is increased and utilization rate of the frequency spectrum and narrowband carrier communication rate and broadband carrier communication distance in the power-line carrier communication are improved.

Description

technical field [0001] The invention relates to a communication system and a communication method in the field of electric power communication, in particular to a cross-band power line carrier communication system and a communication method thereof. Background technique [0002] At present, in the existing test power line carrier communication systems and devices at home and abroad, only a certain frequency point or a certain frequency range in the narrowband 30kHz-500kHz or wideband 2MHz-20MHz is used, and there is a frequency spectrum of 500kHz-2MHz in the middle that is not used. . [0003] The existing power line carrier communication system has the following deficiencies: [0004] 1) The utilization rate of frequency spectrum in the existing power line carrier communication system is very low, and the advantages of high / low frequency signal transmission characteristics are not fully utilized; [0005] 2) The communication rate of narrowband carrier is slow, while the ...

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Problems solved by technology

[0004]1) The utilization rate of frequency spectrum in the existing power line carrier communication system is very low, and the advantages of high / low frequency signal transmission characteristics are not fully utilized;

[0005]2) The speed of narrowband carrier communication is slow, while the distance of broadband carrier communication is very limited;

[0007]The reason why the existing power line carrier communication system has the above shortcomings is mainly because of the difference in transmission characteristics between narrowband signal and wideband signal, as well as the limitation of filter circuit design and power amplifier bandwidth Therefore, it is difficult for the analog front end of the power line carrier machine to achieve smooth and linear processing of signals in the range of 30kHz-20MHz across the frequency band

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