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Automatic meter reading system ofdm carrier communication module symbol group detection method

A carrier communication module, automatic meter reading technology, applied in transmission systems, multi-frequency code systems, digital transmission systems, etc., to achieve the effect of reducing complexity

Active Publication Date: 2018-10-09
株洲信通智能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the power frequency zero-crossing synchronization method suitable for S-FSK (spread spectrum-frequency health control) technology is not suitable for OFDM technology

Method used

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  • Automatic meter reading system ofdm carrier communication module symbol group detection method
  • Automatic meter reading system ofdm carrier communication module symbol group detection method
  • Automatic meter reading system ofdm carrier communication module symbol group detection method

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Experimental program
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Embodiment Construction

[0026] The power carrier module of the automatic meter reading system is directly facing the physical medium power line that actually undertakes data transmission. It provides a physical connection for transmitting the original bit stream for the upper layer application data on the power line, so the power carrier module directly faces various interferences of the power line and decay.

[0027] The present invention will be further described below in conjunction with accompanying drawing.

[0028] Such as figure 1 As shown, the sending end of the OFDM carrier communication module of the automatic meter reading system includes a forward error control encoder and an OFDM modulation module. The data to be transmitted is firstly processed by crosstalk, RS coding, convolutional coding, interleaving, then adaptively modulated and sent to IFFT transformation, and finally processed by the analog front end (Analog Front End, AFE), and coupled to the power line after digital-to-analog ...

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Abstract

The invention discloses a symbol packet detecting method of an OFDM (Orthogonal Frequency Division Multiplexing) carrier communication module for automatic meter reading systems. According to the method, aiming at the noise and interference characteristics of a power line channel and the characteristics of an OFDM power line carrier communication module signal, the main characteristic energy and the main characteristic vector of the receipt signal of an OFDM carrier communication module receiver are sequentially estimated by adopting a recursive least-squares algorithm on the basis of eigen-space decomposition; the symbol packet is detected by utilizing the difference of the main characteristic energy with or without the OFDM signal; and therefore, on the premise of not increasing the frame redundancy of the OFDM signal, the symbol detecting accuracy is increased, the operation complexity is reduced and the method is easy to realize and apply.

Description

technical field [0001] The invention relates to a symbol grouping detection method of an Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) carrier communication module, in particular to an OFDM power carrier communication module used in an automatic meter reading system and a symbol grouping detection method thereof. Background technique [0002] The carrier communication module applied to the automatic meter reading system is used to transmit data on the power line. Since the power line was originally designed to transmit electric energy in the frequency range of 50-60Hz, on the one hand, it is used as a communication channel for data or voice transmission as an information transmission medium. , the power line has complex load conditions, large signal attenuation, small channel capacity, and background noise, random pulse noise, etc.; on the other hand, OFDM technology provides high communication rates and complex error correction...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26G08C19/00H04B3/54
CPCG08C19/00H04B3/54H04L27/2647
Inventor 谷志茹陈顺科肖伸平易吉良黄晓峰石伟
Owner 株洲信通智能科技有限公司