Patent ID: 7602844

Claim:
A method for realizing a frequency-domain equalizer in a Discrete Multitone (DMT) communications system comprising the steps of: generating a plurality of step sizes; said step of generating comprising the steps of: selecting a signal to noise ratio gap value responsive to a received signal power and a tone group for a target channel of a DMT transceiver; selecting a design margin value consistent with said DMT transceiver characteristics and in accordance with said signal to noise ratio gap value; selecting a coding gain value corresponding to a signal to noise ratio of said received signal power; calculating a baseband equivalent noise standard deviation value of a subchannel of said target channel; selecting a signal to noise ratio loss value, said value proportional to a misadjustment parameter of a Least Means Squared (LMS) calculation; and selecting a subchannel equivalent gain value of said subchannel; storing the plurality of step sizes in a lookup table; selecting a step size of the subchannel from the plurality of step sizes in the lookup table according to said received signal power while on-line; and applying the step size to the frequency-domain equalizer.