Discontinuous time-frequency operation

A method comprising:

• pre-compensating N sets of K1 tone data values for crosstalk between N communication lines, the N sets of K1 tone data values pertaining to respective N terminal nodes of a digital communication system;
• calculating from the pre-compensated N sets of K1 tone data values N sets of first time domain symbols;
• calculating a second time domain symbol from a set of K2 tone data values, the K2 tone data values pertaining to a selected one of the N terminal nodes;
• and
• adding the second time domain symbol in a weighted manner to the first time domain symbols such that the second time domain symbol is added to the first time domain symbol for the selected terminal node and to at least one other of the first time domain symbols for the respective other terminal nodes.

A non-transitory computer readable medium comprising program instructions for causing an apparatus to perform at least the following:

• pre-compensating N sets of K1 tone data values for crosstalk between N communication lines, the N sets of K1 tone data values pertaining to respective N terminal nodes of a digital communication system;
• calculating from the pre-compensated N sets of K1 tone data values N sets of first time domain symbols;
• calculating a second time domain symbol from a set of K2 tone data values, the K2 tone data values pertaining to a selected one of the N terminal nodes;
• adding the second time domain symbol in a weighted manner to the first time domain symbols such that the second time domain symbol is added to the first time domain symbol for the selected terminal node and to at least one other of the first time domain symbols for the respective other terminal nodes.

A non-transitory computer readable medium comprising program instructions stored thereon for performing at least the following:

• pre-compensating N sets of K1 tone data values for crosstalk between N communication lines, the N sets of K1 tone data values pertaining to respective N terminal nodes of a digital communication system;
• calculating from the pre-compensated N sets of K1 tone data values N sets of first time domain symbols;
• calculating a second time domain symbol from a set of K2 tone data values, the K2 tone data values pertaining to a selected one of the N terminal nodes;
• and
• adding the second time domain symbol in a weighted manner to the first time domain symbols such that the second time domain symbol is added to the first time domain symbol for the selected terminal node and to at least one other of the first time domain symbols for the respective other terminal nodes.