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Method for eliminating pulse noise in power line communication based on compressed sensing

A technology of power line communication and pulse noise, applied in distribution line transmission systems, electrical components, line transmission components, etc., can solve problems such as high computational complexity of algorithms, achieve the effect of increasing accuracy and improving system performance

Active Publication Date: 2017-11-17
NINGBO UNIV
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Problems solved by technology

These SBL algorithms can improve the effect and strength of noise reduction by integrating prior information about impulse noise, but the algorithm has high computational complexity.

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  • Method for eliminating pulse noise in power line communication based on compressed sensing
  • Method for eliminating pulse noise in power line communication based on compressed sensing
  • Method for eliminating pulse noise in power line communication based on compressed sensing

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Embodiment Construction

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

[0030] Such as figure 2 As shown, a method for impulsive noise elimination in power line communication based on compressed sensing, first uses the empty subcarrier and pilot subcarrier information in the OFDM symbol received by the receiving end, and uses the compressive sensing algorithm to construct an impulsive noise reconstruction algorithm framework , at the receiving end, using the characteristic that the algebraic characteristics of the transmitted signal remain unchanged, a constraint condition is introduced under the framework of the constructed impulse noise reconstruction algorithm, and the constraint condition is relaxed by using the rectangular range in the modulation constellation diagram through convex relaxation, The estimated value of the impulse noise is obtained by calculation, and by subtracting the estimated value of the ...

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Abstract

The invention discloses a method for eliminating pulse noise based on compressed sensing, which is characterized in that in allusion to serious interference imposed on data transmission by pulse noise in a PLC system, the pulse noise is projected to non-data subcarriers according to a CS (Compressed Sensing) algorithm utilizing all OFDM subcarrier information to estimate and eliminate the pulse noise, a compressed sensing problem is built firstly by using pulse noise l1-norm minimization according to an l1-norm minimization based compressed sensing technology, a judgment condition on OFDM symbol non-data subcarriers is introduced to act as a constraint condition, the range of a rectangle in a constellation diagram is modulated through introducing QAM (Quadrature Amplitude Modulation), convex relaxation is performed on the constraint condition, the original problem is simplified into a linear programming problem, the linear programming problem is solved by using the existing method, and a simulation result is displayed in channel coded and channel uncoded 4-QAM and 16-QAM modes. The method disclosed by the invention has better bit error rate performance than several conventional methods.

Description

technical field [0001] The invention relates to a method for eliminating impulse noise in communication, in particular to a method for eliminating impulse noise in power line communication based on compressed sensing. Background technique [0002] Compared with other communication technologies, PLC (Power Line Communications) technology has wide applicability and low installation cost, which makes it a popular communication method in the field of small power grids and other applications. However, the application of PLC technology is limited by some unfavorable factors, among which impulse noise is the main factor affecting the data transmission of power grid. Impulse noise is roughly divided into two types: asynchronous and periodic. Asynchronous impulse noise is mainly caused by switching transients between electrical appliances, which is characterized by short duration, high impulse power, and random appearance. Orthogonal Frequency Division Multiplexing (OFDM) technolog...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04B3/32H04B3/54
CPCH04B3/32H04B3/54H04L27/2602H04L27/265H04L27/2688
Inventor 余明宸李有明吕新荣常生明王旭芃
Owner NINGBO UNIV
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