Iterative channel estimation and impulse noise suppression method in OFDM (Orthogonal Frequency Division Multiplexing) system

A channel estimation and impulse noise technology, applied in the field of power line communication, can solve problems such as impulse noise suppression, and achieve the effect of improving mean square error and bit error rate

Inactive Publication Date: 2021-05-28
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0004] In view of this, an iterative channel estimation and impulse noise suppression method in OFDM system is proposed, which can solve the problems of impulse noise suppression and channel estimation

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  • Iterative channel estimation and impulse noise suppression method in OFDM (Orthogonal Frequency Division Multiplexing) system
  • Iterative channel estimation and impulse noise suppression method in OFDM (Orthogonal Frequency Division Multiplexing) system
  • Iterative channel estimation and impulse noise suppression method in OFDM (Orthogonal Frequency Division Multiplexing) system

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[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are the Some, but not all, embodiments are invented. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0028] 1. System model

[0029] Consider as attached figure 1 The system model and attached figure 2 Block diagram of iterative channel estimation and impulse noise suppression method, the information bits are modulated by baseband modulation, serial-to-parallel conversion and pilot insertion to obtain the modulation symbol X k , and then mapped to the corresponding subcarriers for OFDM modulation to obtain the baseband transmission signal x n , assuming tha...

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Abstract

The invention relates to an iterative channel estimation and impulse noise suppression method in an OFDM (Orthogonal Frequency Division Multiplexing) system, and belongs to the field of power line communication. The method is mainly divided into three parts: 1, detecting and inhibiting strong pulse interference under an expected false alarm probability through a self-adaptive threshold value obtained mathematically; secondly, carrying out channel estimation at a receiving end according to a known pilot signal inserted by a sending end; and 3, reconstructing residual pulse interference by using the signal after zero-forcing equalization and the deep neural network. And finally, the purposes of detecting and suppressing impulse noise, and iteratively realizing accurate channel estimation and good bit error rate are achieved. According to the method, the residual pulse interference which is not suppressed in channel estimation based on adaptive threshold zero setting is thoroughly eliminated, the performance is kept stable under the occurrence probability of various pulse interferences and various pulse interference intensities, and in most pulse interference environments, the performance equivalent to that of channel estimation without pulse interference can be achieved only through iteration for three times or within three times.

Description

technical field [0001] The invention belongs to the field of power line communication, and relates to an iterative channel estimation and impulse noise suppression method in an OFDM-based power line communication system Background technique [0002] Power Line Communication (PLC) refers to a communication method that uses a power line network as a transmission medium for data transmission. Among many existing wired communication systems, the power line communication (PLC) system has been regarded as the solution to the "last mile" of the information highway in recent years due to its competitive data rate, near-universal coverage, and easy access. A solution to the "kilometer" problem has become a research hotspot in the field of communication technology. However, the power line network was not originally designed for data transmission. To use it for communication, many problems must be solved, including time-varying impedance, narrow-band interference, impulse noise (IN) a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L25/03H04L27/26
CPCH04L25/0212H04L25/022H04L25/0254H04L25/03248H04L27/2695
Inventor 王毅丁君敏
Owner CHONGQING UNIV OF POSTS & TELECOMM
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