Power line communication system impulse noise suppression method based on L1/2 norm regularization

A technology of power line communication and pulse noise, which is applied in the direction of distribution line transmission system, transmission system, electrical components, etc., and can solve the problems of low accuracy and estimation error of pulse noise amplitude point estimation

Active Publication Date: 2017-03-15
NINGBO UNIV
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Problems solved by technology

Some researchers proposed a kind of impulse noise L 0 The norm minimization method estimates and eliminates the impulsive noise, but directly solves L 0 The norm is NP (non-deterministic polynomial, non-deterministic polynomial) difficult problem
To solve directly solve L 0 The norm is a technical problem of NP-hard problems, and some researchers have proposed to solve L 0 The NP-hard problem of the norm is relaxed into a convex problem, that is, solving the L of the impulsiv

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  • Power line communication system impulse noise suppression method based on L1/2 norm regularization
  • Power line communication system impulse noise suppression method based on L1/2 norm regularization
  • Power line communication system impulse noise suppression method based on L1/2 norm regularization

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[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0035] The present invention proposes a method based on L 1 / 2 The norm regularized pulse noise suppression method for power line communication system, its overall realization block diagram is as follows figure 1 As shown, it includes the following steps:

[0036] ① At the sending end of the OFDM-based power line communication system, record the initial binary data sequence at the sending end as B; then compile B into multiple fixed-length codewords, and each fixed-length codeword contains N-K data; then Select a fixed-length code word arbitrarily from a plurality of fixed-length code words, write this fixed-length code word as C, express C as C=[c in column vector form 1 ,c 2 ,...,c (N-K) ] T ; After that, C is mapped to an OFDM symbol containing (N-K) data by quadrature phase shift keying (Quadrature Phase Shift Keying, QPSK), and K zero...

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Abstract

The invention discloses a power line communication system impulse noise suppression method based on L1/2 norm regularization. At a sending end, discrete time domain signals with cyclic prefixes is transmitted to a receiving end through a channel; at the receiving end, based on a compressed sensing theory, through introduction of regularization parameters and utilization of an iteration solving method, first the problem of estimation of impulse noise is converted into the problem of regularization of an L1/2 norm minimum value of the impulse noise, then the problem is converted into a form containing a two-step iteration result and the iteration solving method is utilized for solution, and thus estimation of an amplitude point of the impulse noise is relatively accurate; and by adoption of a threshold function to process the iterative result, a sampling point which is not affected by impulse noise interference has a relatively small estimation error.

Description

technical field [0001] The present invention relates to a power line communication system pulse noise suppression technology, in particular to a technology based on L 1 / 2 A norm-regularized impulsive noise suppression method for power line communication systems. Background technique [0002] Power line communication (Powerline Communication, PLC) is a communication method that uses a power line medium for carrier transmission. As a well-established infrastructure, power lines can greatly reduce communication costs by using them for data transmission. Existing typical power line communication system applications include: remote meter reading, real-time quotation, and intelligent energy management. In future application designs, including slow-scanning TV images, video and audio signals, they can all be transmitted through the power line network. However, since the power line was originally designed to transmit electric energy, the voltage on the line is high, the noise is ...

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Application Information

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IPC IPC(8): H04B3/54H04B17/345H04B3/46
CPCH04B3/46H04B3/54H04B17/345
Inventor 余明宸李有明常生明付彩梅周桂莉
Owner NINGBO UNIV
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