PLC channel impulse noise detection method and system using square exponential kernel

Abstract

The embodiment of the invention discloses a PLC (Programmable Logic Controller) channel impulse noise detection method and system by utilizing a square exponential kernel. The method comprises the following steps: step 1, inputting an actually measured signal sequence S; and step 2, detecting the PLC channel impulse noise according to the square exponential kernel property. The method specificallycomprises the following steps: if a square exponent kernel HK of a Kth window meets a judgment condition that | HK | is greater than or equal to e0, detecting impulse noise at a Kth point of a signalsequence S; otherwise, determining that the impulse noise is not detected, wherein e0 is an impulse noise judgment threshold value.

Description

Technical field [0001] The present invention relates to the field of communication, in particular to a method and system for detecting impulse noise of a PLC channel. Background technique [0002] Compared with various wired communication technologies, power line communication has the advantages of no need for rewiring and easy networking, and has broad application prospects. Power line communication technology is divided into narrowband over power line (NPL) and broadband power line communication (Broadband over power line, BPL); narrowband power line communication refers to the power line carrier communication technology with a bandwidth limited to 3k500kHz; power line communication technology includes European CENELEC The specified bandwidth (3148.5kHz), the Federal Communications Commission (FCC) specified bandwidth (9490kHz), the Japanese Association of Radio Industries and Businesses (Association of Radio Industries and Businesses, ARIB) specified bandwidth (9450kHz), and C...

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Problems solved by technology

[0003] Although the power line communication system has a wide range of applications and the technology is relatively mature, a large number of branches and electrical equipment in the power line communication system will generate a lot of noise in the power line channel; among them, random impulse noise has great randomness, and the noise intensity High, causing serious damage to the power line communication system, therefore, the suppression technology for random impulse noise has been the focus of research by domestic and foreign scholars; and the noise model does not conform to the Gaussian distribution

Therefore, the traditional communication system designed for Gaussian noise is no longer applicable to the power line carrier communication system, and the corresponding noise suppression technology must be studied to improve the signal-to-noise ratio of the power line communication system, reduce the bit error rate, and ensure the quality of the power line communication system

In practical applications, some simple nonlinear techniques are often used to eliminate power line channel noise, such as Clipping, Blanking and Clipping / Blanking techniques, but these research methods must work well under a certain signal-to-noise ratio. In order to eliminate the impact noise, in the power line communication system, some commercial power line transmitters are characterized by low transmission power. In some special cases, the transmission power may even be lower than 18w. Therefore, in some special cases, the signal will be Submerged in a large amount of noise, leading to low signal-to-noise ratio conditions in power line communication systems

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