Channel concatenated coding and decoding method for power line carrier communication and apparatus thereof

Abstract

The invention relates to a channel concatenated coding and decoding method for power line carrier communication and an apparatus thereof. According to the coding process, an original information frame sent from an upper computer enters a frame location module for frame head location; after location, the original information frame enters a code scrambling module for code scrambling; after code scrambling, the original information frame enters an RS coding module for RS coding; and after an RS code is output, the original information frame enters a convolutional coding module for convolutional coding, and then the code is output. According to the decoding process, demodulated baseband coding information is sent to a Viterbi decoding module for convolutional decoding; after Viterbi convolutional decoding, original rate information is recovered; a frame synchronization module searches a frame head from the original rate information so as to realize frame synchronization; after frame synchronization, RS decoding data clustering information can be determined; a synchronization result is fed back to the Viterbi decoding module simultaneously; information with the frame synchronized enters an RS decoding module for RS decoding; and finally, a descrambling module descrambles the information so as to recover the original information frame. The channel concatenated coding and decoding method can be applied to a modulation-demodulation device of power line carrier communication, and can improve the anti-interference capacity of signals in transmission, transmission quality and transmission efficiency.

Description

technical field [0001] The present invention belongs to the technical field of communication, and specifically relates to a coding and decoding method and device thereof in a low-voltage power line carrier communication system, which can be widely used in low-voltage power line carrier communication systems, and is especially suitable for modulation in a low-voltage power line carrier meter reading system demodulator. Background technique [0002] Low-voltage power line carrier communication (LowPowerLineCommunication, LowPLC) refers to the technology that uses the existing solid and reliable low-voltage 220V line as a communication carrier to transmit digital signals at high speed through carrier wave. This technology has the characteristics of small amount of wiring network construction, stable and reliable transmission lines, and reasonable routing. However, the signal attenuation characteristics and interference characteristics on low-voltage power lines are very comple...

AI Technical Summary

Problems solved by technology

However, the signal attenuation characteristics and interference characteristics on low-voltage power lines are very complex, and they are random and time-varying

The existing terminal modulation and demodulation modules usually only focus on carrier modulation and demodulation methods for these problems. In fact, when the bit error rate of the interfered channel reaches a certain level, the improvement of BFSK, QSK, BQSK and other modulation and demodulation methods cannot effectively reduce Bit error rate, so the existing low-voltage power line communication equipment has low information transmission rate, high bit error rate, and low transmission efficiency

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