Optimum joint transmit-receive linear processing for vectored DSL transmission with QoS requirements

This paper considers a DSL system in which a subset of the twisted-pair copper wires within a bundle can perform a joint-processing at both sides of the communication system(e. g;, links between central offices and remote terminals or between central offices and private networks). The DSL channel is treated as a multi-input multi-output (MIMO) system over which many substreams are established. It is assumed that the signal constellation to be used at each substream is given (possibly after some kind of bit distribution optimization) with a corresponding Quality of Service (QoS) constraint, e.g., to guarantee a certain error probability.