A low complexity linear precoding technique for next generation VDSL downstream transmission over copper

Amir Leshem, Li Youming

    Research output: Contribution to journalArticlepeer-review

    44 Scopus citations

    Abstract

    In this paper, we study a simplified linear precoding scheme for far-end crosstalk (FEXT) cancellation in very high bit-rate digital subscriber line (VDSL) downstream transmission. We compare the proposed method to zero-forcing (ZF) FEXT cancellation and show that for multipair VDSL systems the method achieves rates that are close to the ZF precoding method. We also derive simple lower bounds on the performance that allows us to predict the performance of the proposed algorithm on each tone. We end up with testing the proposed method on theoretical and empirical channels. This is the first extensive study of VDSL precoding on measured channel data. The proposed method is less complex than ZF precoding and, therefore, alleviates the computational load at the initialization and tracking of precoded VDSL or VDSL2 systems. Finally, we discuss implementation complexity in terms of total Silicon area and show that the method has favorable implementation complexity, since only channel coefficients need to be stored during steady-state transmission.

    Original languageEnglish
    Pages (from-to)5527-5534
    Number of pages8
    JournalIEEE Transactions on Signal Processing
    Volume55
    Issue number11
    DOIs
    StatePublished - Nov 2007

    Keywords

    • Crosstalk mitigation
    • Digital subscriber line (DSL)
    • Linear precoding
    • Multichannel receivers
    • Multichannel transmission
    • VDSL2
    • Vectored transmission
    • Very high bit-rate DSL (VDSL)

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