2018-07-192018-07-192017-12-11GOMES, Diego de Azevedo. Modelling and mitigation of alien crosstalk for DSL systems. 2017. 105 f. Orientador: Aldebaro Barreto da Rocha Klautau Júnior. Tese (Doutorado em Engenharia Elétrica) - Instituto de Tecnologia,, 'Universidade Federal do Pará, Belém, 2017. Disponível em: <http://repositorio.ufpa.br/jspui/handle/2011/10090>. Acesso em:.https://repositorio.ufpa.br/handle/2011/10090G.fast is the most recent ITU-T standard for DSL transmission, which targets copper topologies with short distances and adopts a bandwidth of 106 MHz extensible to 212 MHz. In several situations, G.fast systems will be composed by or coexist with uncoordinated (or alien) lines, which are sources of strong crosstalk, because these lines are not part of the vectored group. This document presents a formulation to explain the performance of the alien crosstalk mitigation methods according to the number of alien lines in a certain environment, the mechanism that de nes the interference correlation of it and an alien crosstalk mitigation method for downstream DSL transmission impaired by multiple interferers called AMMIS. Simulation results show that alien crosstalk mitigation methods found in the literature can indeed improve the performance of G.fast systems, but only under speci c conditions. We have contrasted these situations and we provide guidelines about the feasibility of the crosstalk mitigation techniques in scenarios with distinct number of alien lines. Additionally, the AMMIS shows promising results in relation to the bit rate when compared with literature methods in scenarios with a large number of interferers, with the additional advantage of allows power savings. As support for the simulations, we also present a set of alien crosstalk measurements.Acesso AbertoG.fast (Acesso rápido ao terminal do assinante)Mitigação de alien crosstalkPredição linearMediçõesG. Fast (Fast access to subscriber terminal)Mittigation alien crosstalkLinear predictionMeasurementsTeseCNPQ::ENGENHARIAS::ENGENHARIA ELETRICA::TELECOMUNICACOES::SISTEMAS DE TELECOMUNICACOESPROCESSAMENTO DE SINAISTELECOMUNICAÇÕES