Exploiting crosstalk pair-to-pair correlation in two-pair digital subscriber lines

It is shown that, by coordination of the signaling on the pairs, correlation between their noise voltages can be exploited with relatively simple implementations. One such implementation for transmitting at 1.6 Mb/s is illustrated. Correlation was predicted with a relatively simple model. There is a greater than 50% chance of a higher than 1.5-dB processing gain being achieved by exploiting near-end crosstalk correlation in this way