Dynamic Spectrum Management for Upstream Mixtures of Vectored & Non-Vectored DSL

As field trials and initial deployments of Vectored DSL systems materialize in the next few years, Vectored DSL systems will often co-exist with non-vectored DSL systems sharing the same cable. For such mixed-binder scenarios with vectored and non-vectored lines, this paper presents an optimal Dynamic Spectrum Management (DSM) technique referred to as Mixed-binder Optimum Spectrum Balancing (MixOSB) to find the optimal transmit PSD spectra. When the mixed-binders have short vectored lines and long non-vectored lines, simulations show that MixOSB has substantial performance gains over applying existing DSM techniques independently to the vectored DSL systems and non-vectored DSL systems because it reduces the interference induced by the vectored lines on the non-vectored lines. The high computational complexity of MixOSB prohibits its practical implementation. So, a low-complexity practically-implementable mixed-binder multi-level water-filling (MixMLWF) algorithm is proposed and simulations show its performance is close to the solution given by MixOSB.