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A Power Line Carrier Communication Preamble Detection Method Against Random Impulse Noise

A technology of power line carrier and random pulse, which is applied in the field of digital information transmission, can solve the problem that the correlation value does not drop rapidly, and achieve good robustness

Active Publication Date: 2020-04-03
INST OF ACOUSTICS CHINESE ACAD OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the subscript of the energy window is ahead of the correlation window, when the energy drops rapidly, the correlation value does not drop rapidly, resulting in a period of interference peak at the end of the frame, which may cause the false impression that another frame is coming

Method used

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  • A Power Line Carrier Communication Preamble Detection Method Against Random Impulse Noise
  • A Power Line Carrier Communication Preamble Detection Method Against Random Impulse Noise
  • A Power Line Carrier Communication Preamble Detection Method Against Random Impulse Noise

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Embodiment 1

[0050] Based on the above power line carrier communication preamble detection method, in this example, the specific implementation steps of the preamble detection method specifically include:

[0051] Step 1) Refer to figure 2 The leading structure of the power line communication shown is composed of 10.5 SYNCPs and 2.5 SYNCMs, where SYNCM=-SYNCP. SYNCP is defined as:

[0052]

[0053] Cache a single preamble segment S with a length of N=1024 k to local, S k Generated by formula (1) for a single standard leader, here refers to intercepting a certain segment from a single leader cyclic sequence SYNCP, the leader sequence segment and the input signal r k The structure of the leading cyclic sequence unit in is consistent, and the average value of the locally cached leading sequence fragments is calculated to be 2047.

[0054] Step 2) Read the input signal, and check the amplitude value of each point in the input signal, set the threshold value to 4096, and judge whether the...

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Abstract

The invention provides a random impulse noise resistant power line carrier communication preamble detection method. According to the method, local preamble sequence fragments are cached and impulse denoising processing is carried out on signals; cross-correlation calculation is carried out on the locally cached preamble sequence fragments and input signals, autocorrelation calculation is carried out on the input signals, and cross-correlation and autocorrelation calculation results are substituted into a normalized judgment function; and a set threshold is compared with a calculation result ofthe judgment function, and a detection result of preamble cyclic sequence units is obtained. Compared with a traditional preamble detection method, the preamble detection method provided by the invention has the advantages that the method has relatively good robustness for random impulse noises, an interference peak does not appear when a frame is finished, and an illusion that another frame of signal comes can be effectively avoided.

Description

technical field [0001] The invention relates to the field of digital information transmission, in particular to a preamble detection method for power line carrier communication against random impulse noise. Background technique [0002] With the development of network technology, power carrier communication has attracted great attention in applications such as information appliances and building intelligence due to its advantages of wide distribution and low laying costs. [0003] The transmission environment of power carrier communication is very complex. In the communication process, due to its own high power characteristics, random pulse noise has great interference to the power carrier communication system and becomes an important factor hindering the performance of power line communication. [0004] In power carrier communication, the preamble is an important part of the frame structure, and its main functions include frame detection, symbol synchronization, channel est...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B3/54H04B3/46H04B15/00H04L27/26
CPCH04B3/46H04B3/54H04B15/00H04L27/2647
Inventor 李松斌刘鹏钟永捷
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI