Carrier communication method and system for BFSK (Binary Frequency Shift Keying) spread-spectrum power line

Abstract

The invention provides a carrier communication method and system for a BFSK (Binary Frequency Shift Keying) spread-spectrum power line. The method comprises the following steps of: (1) replacing an information bit of a transmitted data message with a special spread-spectrum PN (Pseudo-random Number) code sequence by a communication sending terminal to generate spread-spectrum data, modulating thespread-spectrum data to a carrier wave sending frequency range according to a BFSK modulation mode, and coupling to the power line through a coupling circuit; (2) detecting an interference state of the power line, automatically selecting a carrier communication frequency range and a communication working mode and simultaneously initiating a message including the working mode and carrier wave information by the communication sending terminal; and (3) sampling modulated BFSK signals by a communication receiving terminal after carrier wave signals received by the power line are modulated by the communication receiving terminal, despreading the signals according to a PN code of the communication receiving terminal to restore out the original information bit, and restoring out a communication message transmitted by the sending terminal according to a stipulated frame format. According to the method provided by the invention, the interference on the power line is automatically monitored, and the best communication frequency range and communication mode are automatically switched, thereby the reliability and the stability of power line carrier communication are improved.

Description

technical field [0001] The present invention relates to the field of low-voltage power line carrier spread spectrum communication, in particular to a BFSK spread spectrum carrier power line communication method and system based on the characteristics of industrial frequency power lines, which are applied to the application fields of low-voltage power line automatic meter reading and electricity information collection. Background technique [0002] In recent years, power line carrier communication technology has been widely used in low-voltage power carrier meter reading systems. Spread spectrum carrier communication has good anti-interference performance, but there are some problems in current carrier communication technology. At present, the main spread spectrum communication mostly uses narrowband BFSK Or BPSF communication, the anti-interference performance of the same frequency is very poor, and it does not combine the characteristics of the power line itself to achieve r...

AI Technical Summary

Problems solved by technology

[0007] The invention provides a BFSK spread spectrum carrier communication method based on the characteristics of power frequency power lines, which solves low-voltage power carrier communication by adopting spread spectrum code selection, automatic switching of frequency bands, automatic switching of communication working modes, and efficient frame synchronization capture and tracking algorithms. distance and stability issues, and this method is applied to ASICs, providing a BFSK spread spectrum carrier communication system based on the characteristics of power frequency power lines

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