System and method for detecting burst noise during quadrature amplitude modulation communications

摘要

A system and method for detecting burst noise during quadrature amplitude modulation (QAM) communications are provided. A QAM signal is acquired at a receiver in communication with a network. The QAM signal is demodulated at the receiver to identify a plurality of symbols. Amplitudes for each of the plurality of symbols are determined, and are compared to a predetermined threshold. For each amplitude that is greater than the predetermined threshold, information is recorded at the receiver relating to a burst noise event. The magnitude of the burst noise can be determined by measuring a difference between a received constellation point and a perimeter constellation point closest to the received constellation point. The information about the burst noise event can be transmitted to an error correction module for reducing future burst noise in the network. Equalizer coefficients and tracking loop performance can be adjusted/enhanced using the burst noise information.

主权项

1. A system for detecting burst noise during quadrature amplitude modulation (QAM) communications in a cable modem system, comprising:
a cable modem termination system (CMTS) receiver in communication with a plurality of cable modems, the receiver receiving a QAM signal and demodulating the QAM signal to identify a plurality of symbols; and a burst noise detection module in communication with the CMTS receiver for detecting burst noise in QAM signals received by the receiver, the burst noise detection module determining normalized amplitudes for each of the plurality of symbols, comparing the amplitudes to a threshold, and recording information relating to a burst noise event for each absolute amplitude that is greater than the predetermined threshold, wherein the detection module detects burst noise information for each channel in the network, the burst noise information having a resolution corresponding to the width of the channel.