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Impulse noise suppression method for sparse iterative covariance estimation in power line

A technology of covariance estimation and impulse noise, which is applied to the shaping network, channel estimation, and electrical components in the transmitter/receiver, and can solve the problems of ineffective suppression of impulse noise and poor estimation performance of impulse noise

Active Publication Date: 2019-11-22
NINGBO UNIV
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Problems solved by technology

However, these methods are more suitable for Bernoulli Gaussian impulse noise. Through simulation experiments, it is found that for the impulse noise generated by the Middleton type A model that is closer to the actual situation, the impulsive noise estimation performance of these methods is poor, resulting in the inability to effectively suppress the impulsive noise.

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  • Impulse noise suppression method for sparse iterative covariance estimation in power line
  • Impulse noise suppression method for sparse iterative covariance estimation in power line
  • Impulse noise suppression method for sparse iterative covariance estimation in power line

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Embodiment Construction

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

[0035] The present invention proposes an impulse noise suppression method for sparse iterative covariance estimation in power lines, and its overall realization block diagram is as follows figure 1 As shown, it includes the following steps:

[0036] Step 1: At the transmitting end of the OFDM-based power line communication system, record the initial binary data sequence at the transmitting end as B; then compile B into multiple fixed-length codewords, and each fixed-length codeword contains (N-M) data; then arbitrarily select a fixed-length code word from a plurality of fixed-length code words, mark this fixed-length code word as C, and express C as C=[c in column vector form 1 ,c 2 ,...,c (N-M) ] T ; Then map C to an OFDM symbol containing (N-M) data by quadrature amplitude modulation (Quadrature Amplitude Modulation, QAM), and fill M 0s ...

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Abstract

The invention discloses an impulse noise suppression method for sparse iterative covariance estimation in a power line, which comprises the following steps of: at a sending end, transmitting a discrete time domain signal added with a cyclic prefix to a receiving end through a channel; at a receiving end, firstly, projecting a received signal on an empty subcarrier matrix to obtain a mixed signal only containing impulse noise and Gaussian noise; utilizing sparse iterative covariance estimation to obtain the power of the mixed signal so as to obtain the power of the impulse noise; utilizing thelinear mean square error to obtain an estimated value of the impulse noise; subtracting the estimated value of the impulse noise from the received signal to complete suppression of the impulse noise.The method has the advantages that the adopted sparse iterative covariance estimation has higher resolution, and the power of the mixed signal can be estimated more accurately, so that the estimated impulse noise is more accurate, and the suppression effect of the impulse noise is better.

Description

technical field [0001] The invention relates to an impulse noise suppression technology, in particular to an impulse noise suppression method for sparse iterative covariance estimation in power lines. Background technique [0002] With the rapid development of the smart grid, the use of power line communication (PowerLine Communication, PLC) has gradually attracted people's attention. Power line communication is a communication method that uses power line media for data transmission. In the power line communication system, the channel characteristics are complex and the multipath effect is obvious. In order to combat the multipath effect, multi-carrier Orthogonal Frequency Division Multiplexing (OFDM) technology is generally used. The early design of power line communication only considered the transmission of electricity, and did not consider the transmission of data signals. In reality, communication has relatively high requirements for equipment, but the existing power ...

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Application Information

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IPC IPC(8): H04L25/03H04L25/02
CPCH04L25/021H04L25/03821
Inventor 李有明王勇梁晖
Owner NINGBO UNIV
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