Systems and methods that provide frequency domain supplemental training of the time domain equalizer for dmt

Abstract

Using a known or later developed time domain equalizer coefficient training algorithm, a least square solution for the time domain equalizer coefficients is taken at a starting point and iteratively improved on. In particular, the improvement is directed towards maximizing number of bits per frame loaded over the time domain equalizer coefficient choice. This can be accomplished by maximizing capacity directly rather than setting a goal to shorten the channel and hoping that the capacity will be maximized as a result.

1 . A system that performs supplemental frequency domain training of a time domain equalizer comprising: 
 a training module that uses an initial solution for time domain equalizer coefficients and determines updated time domain equalizer coefficients by maximizing the number of bits per frame; and    a time domain equalizer that receives the updated time domain equalizer coefficients.    
   
   
       2 . The system of  claim 1 , wherein the supplemental training is performed during medley.  
   
   
       3 . The system of  claim 1 , wherein the updated time domain equalizer coefficients are used during showtime.  
   
   
       4 . The system of  claim 1 , wherein the training module receives a data matrix from an echo canceller.  
   
   
       5 . The system of  claim 1 , wherein additional training is performed based on the updated time domain equalizer coefficients.  
   
   
       6 . The system of  claim 5 , wherein the additional training comprises frequency domain equalizer training and signal to noise ratio measurements for bit loading.  
   
   
       7 . The system of  claim 1 , wherein the system is located in one or more of a DSL, VDSL, SDSL, HDSL, HDSL2, discrete multi-tone, discrete wavelet multi-tone DSL or wireless OFDM system.  
   
   
       8 . The system of  claim 1 , wherein the training module further determines a mean squared signal value for each bin, for the given time domain equalizer coefficients.  
   
   
       9 . The system of  claim 1 , wherein the training module further determines an average error squared value over a predetermined number of frames for each bin.  
   
   
       10 . The system of  claim 1 , further comprising using the updated time domain equalizer coefficients as the initial solution for time domain equalizer coefficients.  
   
   
       11 . A method that performs supplemental frequency domain training of the time domain equalizer comprising: 
 receiving a solution of initial time domain equalizer coefficients;    determining updated time domain equalizer coefficients by maximizing the number of bits per frame; and    forwarding the updated time domain equalizer coefficients to a time domain equalizer.    
   
   
       12 . The method of  claim 11 , wherein the supplemental training is commenced during medley.  
   
   
       13 . The method of  claim 11 , further comprising determining a mean squared signal value for each bin, for the given time domain equalizer coefficients.  
   
   
       14 . The method of  claim 11 , further comprising determining the average error squared value over a predetermined number of frames for each bin.  
   
   
       15 . The method of  claim 11 , further comprising repeating the determining step using the updated time domain equalizer coefficients as the initial time domain equalizer coefficients.  
   
   
       16 . The method of  claim 11 , further comprising estimating a channel frequency response.  
   
   
       17 . The method of  claim 11 , wherein the updated time domain equalizer coefficients are used during showtime.  
   
   
       18 . The method of  claim 11 , wherein the method is performed in one or more of a DSL, VDSL, SDSL, HDSL, HDSL2, discrete multi-tone, discrete wavelet multi-tone DSL or wireless OFDM system.  
   
   
       19 . The method of  claim 11 , further comprising receiving a data matrix.  
   
   
       20 . The method of  claim 11 , further comprising performing additional training is performed based on the updated time domain equalizer coefficients.  
   
   
       21 - 30 . (canceled)