Impulse noise suppression and demapping soft decision method and system in multi-carrier system

Abstract

The invention provides impulse noise suppression and demapping soft decision method and system in a multi-carrier system, wherein the method comprises the following steps of: carrying out statistics on power of receiving signals by an A / D (Analog to Digital) module by a power statistical module, comparing the power with a set threshold, judging whether impulse noise exists in the received signals or not, and if the impulse noise exists, generating an impulse indication signal and a confidence indication signal by the power statistical module; carrying out impulse noise suppression processing on the received signals which are judged to have the impulse noise by an AGC (Automatic Gain Control) module and carrying out power regulation on the receiving signal according to the impulse indication signal; feeding back the power-regulated receiving signal to the A / D module; setting up a confidence weight number according to the confidence indication signal by a demapping module, and carrying out soft decision processing on received information output from the A / D module according to the confidence weight number. The invention can effectively suppress the impulse noise and provides different confidence indications according to different impulse noise types to ensure the reliability of the demapping soft decision.

Description

Technical field [0001] The invention belongs to the technical field of digital information transmission, and particularly relates to a soft decision method and system for impulse noise suppression and demapping in a multi-carrier system. Background technique [0002] Impulse noise mainly comes from natural or man-made factors such as lightning, automobile engines, electrostatic discharge, and electrical switch switching. Impulse noise has two main points in common: 1. The energy is concentrated in a short time; 2. The energy is much higher than the background thermal noise. It has short-term, sudden, high-energy and unpredictable, usually its average duration Less than 250us, the interval between two bursts is greater than 67ms. That is to say, the interval between pulses is much longer than the duration of the pulse. Because of its short duration, it has a wider spectrum, which can be distributed from low frequency to very high frequency, but the higher the frequency, the smal...

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Problems solved by technology

[0008] The present invention aims at the problem of signal reliability reduction caused by pulse noise, and provides a joint automatic gain control (Auto Gain Control, AGC) pulse noise suppression and demapping soft decision method in a multi-carrier system, which can not only effectively suppress pulse noise, but also Depending on the type of impulse noise, different reliability indications are provided to ensure the reliability of soft decisions for understanding mapping

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