Achieving high data rates on low quality twisted pair cables under certain power and complexity constraints requires optimized physical layer transmission. This chapter discusses signal transmission in G.fast with the focus on precoding and spectrum optimization in downstream direction. The power constraints to be considered for wireline transmission are different than a sum-power constraint that is mostly used in literature, requiring a more general optimization framework. A realistic estimation of the achievable data rates under the conditions of an implementable G.fast transceiver is provided.
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