Patent ID: 8571094
Filing Date: 2013-10-29
Classification: H04L

Abstract:
1. A noise measurement method for noise measurement in a transmission Digital Subscriber Line system, said system comprising a transmitting Digital Subscriber Line modem and a receiving Digital Subscriber Line modem, said transmitting Digital Subscriber Line modem being coupled over a communication line to said receiving Digital Subscriber Line modem, the method comprising: receiving a symbol, at said receiving Digital Subscriber Line modem, transmitted by said transmitting Digital Subscriber Line modem; demapping, at said receiving Digital Subscriber Line modem, said symbol received on a constellation point; performing, at said receiving Digital Subscriber Line modem, the noise measurement based on the difference between the received symbol and the constellation point; determining, at said receiving Digital Subscriber Line modem, a frequency of symbols incorrectly demapped; and correcting, at said receiving Digital Subscriber Line modem, said noise measurement using said frequency of said symbols incorrectly demapped.