Method of detecting and suppressing pulse noise

A technology of impulse noise and power detection, applied in the field of digital signal transmission, to reduce damage

Active Publication Date: 2008-05-14
HANGZHOU NATCHIP SCI & TECH
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Problems solved by technology

[0003] The purpose of the present invention is to provide a new impulse noise detection and suppression method for the deficiencies in the existing impulse noise detection and suppression methods

Method used

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  • Method of detecting and suppressing pulse noise
  • Method of detecting and suppressing pulse noise
  • Method of detecting and suppressing pulse noise

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Embodiment Construction

[0015] The implementation block diagram of this method is shown in Figure 1. The two dotted-line boxes in the figure use the received signal to calculate the average power and average amplitude. Various impulse noise detection thresholds and clipping thresholds are based on average power and average amplitude.

[0016] Figure 2 shows the functional block diagram of impulse noise detection. In this example, the detection window length of impulse noise is selected as 512, 128, and 32 (respectively, long, medium, and short windows). There are 6 detectors in the impulse noise detection logic (that is, long, medium window, single point power detector and long, medium, short window large amplitude counting detector, single point detection is a special form with a window length of 1), each The detector sets the high threshold, medium threshold, and low threshold. The threshold calculation module needs to provide a total of 18 thresholds, as shown in the following table:

[0017] ...

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Abstract

The invention relates to a method for detecting and restraining impulse noise interference in received digital signals. The existing method can only handle the impulse noise with a short burst time and work inefficient in restraining the impulse noise with a long and persistent burst time. The invention obtains an average power and an average extent through smooth filtering in a time domain by applying power and extent of received signals, so as to generate detecting threshold values and limiting threshold values for different detecting methods; then a plurality of methods are used for detecting the generating position and type of the impulse noise; lastly, different limiting threshold values are used according to the method for detecting the impulse noise to restrain the impulse noise. The method of the invention can detect the generating position of the impulse noise from the received signals and determine the type of the impulse noise, then select different restraining methods to restrain the impulse noise in different types and perform effective restraint.

Description

technical field [0001] The invention belongs to the field of digital signal transmission, in particular to a method for detecting and suppressing pulse noise interference in a received digital signal. Background technique [0002] In a digital signal transmission system, impulse noise interference is one of the key factors affecting transmission performance, which can cause burst errors in the system and even cause transmission interruption. The main characteristics of impulse noise are sudden, large interference amplitude and short duration. Observed from the frequency spectrum, impulse noise usually has a wide frequency spectrum. Impulse noise mainly comes from various electrical interference, lightning interference, electric spark interference, automobile engine ignition interference, etc. The existing technology is to use the data decision feedback time domain to cancel the impulse noise. However, due to the complexity of the transmission channel, it can only deal wit...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/10H04B1/707H04B17/00
Inventor 邹志永赵小祥陈继晖
Owner HANGZHOU NATCHIP SCI & TECH
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