Methods and systems for determining crosstalk for a joining line in a vectored system

At least one example embodiment discloses a method of determining crosstalk for a joining line in a communication system having a plurality of current active lines. The method includes obtaining a number of disturber lines among the plurality of current active lines, the number of disturber lines being less than a number of the plurality of current active lines, obtaining a pilot matrix, a first dimension of the pilot matrix being based on the number of disturber lines, the pilot matrix representing a sequence of pilots to be transmitted across the plurality of current active lines and the joining line, the first dimension being a number of time instances, the number of time instances being less than the number of the plurality of active lines and determining a crosstalk coupling vector for the joining line based on the pilot matrix

Performance of digital subscriber line spectrum optimization algorithms

A management standard for digital subscriber line (DSL) systems has been defined in order to ensure the spectral compatibility of the signals, services, and technologies that are deployed. Compatibility is typically accomplished by using static spectral masks. This conservative approach may lead to suboptimal performance of DSL systems. Recently, a number of dynamic spectrum management (DSM) solutions were proposed that improve DSL performance by adaptive application of spectral masks, also known as DSM level 2. The masks are calculated taking into account actual performance requirements and impairments, such as crosstalk. We present improved DSM level 2 algorithms that are faster than existing algorithms and demonstrate potential rate/reach gains by numerical simulations for some DSL technologies, such as asymmetric digital subscriber line transceivers. We also present a solution for flexible deployment of DSM spectrum optimization algorithms in the field.18 page(s