ABSTRACT
Abstract Copper transmission technologies have made remarkable progress over the last 20 years and have produced mature, nearly optimal
architectures for signaling over a single copper pair. As data rates and signal bandwidths increase, however, crosstalk interactions among the binder pairs become a major performance bottleneck. Next generation Digital Subscriber Line (DSL) systems are expected to provide substantial performance improvements by coordinating transmission across multiple copper pairs to mitigate crosstalk impairments. This chapter reviews various advanced MIMO (multiple-input-multiple-output) signal processing architectures for multiline transceivers and discusses their benefits and drawbacks. It explains how these techniques are able to mitigate (self and alien) NEXT (near-end crosstalk) and FEXT (far-end crosstalk), and discusses their performance under various loop and disturber conditions. Both point-to-point and point-to-multipoint methods are described and their performance and complexity tradeoffs are discussed.
