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Power line carrier periodic impulse noise detecting and restraining method based on OFDM

A technology of power line carrier and periodic pulse, applied in the direction of modulation carrier system, distribution line transmission system, electrical components, etc., can solve the problems of useful signal amplitude distortion, useful signal influence, etc., to improve accuracy, increase suppression effect, reduce effect of complexity

Active Publication Date: 2015-01-21
STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST +1
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Problems solved by technology

The disadvantage of this method is that when the impulse noise in the window is suppressed, it will affect the useful signal in the window, and the large window scale may cause too much amplitude distortion of the useful signal

Method used

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  • Power line carrier periodic impulse noise detecting and restraining method based on OFDM
  • Power line carrier periodic impulse noise detecting and restraining method based on OFDM
  • Power line carrier periodic impulse noise detecting and restraining method based on OFDM

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with drawings and embodiments.

[0030] The present invention is an OFDM-based power line carrier periodic pulse noise detection and suppression method. By utilizing the frequency division characteristics of OFDM subcarrier channels, the detection of periodic pulse noise is realized, and it is filtered by an adaptive notch filter. Therefore, the periodic pulse noise is effectively suppressed, and the present invention will be further described below in conjunction with the accompanying drawings.

[0031] figure 1 It shows the power value of each subcarrier in an OFDM symbol interfered by impulse noise. According to the set power threshold, it is judged whether there is impulse noise interference in each subcarrier. The calculation formula is P max >P th ,P th =a*P mean , where α is the scale factor, P max is the maximum power value of the subcarrier, P mean is the average power value.

[0032] ...

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Abstract

A power line carrier periodic impulse noise detecting and restraining method based on the OFDM includes the steps of firstly, judging whether periodic impulse noise exists or not, conducting statistic positioning on the frequency band of the periodic impulse noise, modulating a filter again, and restraining the periodic impulse noise in a targeted mode. The complexity of a traditional noise restraining method is remarkably lowered; meanwhile, the restraining effect is remarkably improved, and the signal accuracy is improved.

Description

technical field [0001] The invention relates to the technical field of communication noise detection, in particular to a method for detecting and suppressing periodic pulse noise of a power line carrier. Background technique [0002] In low-voltage power line carrier communication, due to the complex structure of the power grid and various types of loads, there are a lot of interference noises on the power line, among which the interference of impulse noise is the most serious. Impulse noise is divided into random impulse noise and periodic impulse noise, among which periodic impulse noise is the most common. This type of noise is usually generated by electrical equipment and has a relatively fixed frequency (generally in the range of 40-200kHz), and its power spectral density is often higher than that of The carrier signal is much higher (the present invention only considers the noise whose frequency is within the PLC frequency range), and the duration generally exceeds sev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/03H04B3/54
CPCH04B3/54H04L27/2688
Inventor 叶君候兴哲孙洪亮郑可
Owner STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST
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