Digital RFI suppression in DMT-based VDSL systems

Research output: Contribution to journalArticle


In this paper, we propose a method for suppressing radio frequency interference (RFI) in discrete multitone (DMT) based very high bit rate digital subscriber line (VDSL) systems. The method operates in the frequency domain of a DMT system. First, we derive a model of how an unknown narrow-band RF signal is mapped onto the DMT carriers. Then, by measuring the RFI on a few unused DMT carriers we are able to subtract RFI estimates from every modulated subcarrier. Simulation results show. that this method, applied to an RFI signal with the same average power as the VDSL signal, suppresses the RFI with 40-50 dB, which reduces the average SNR loss from about 20 to less than 0.3 dB.


Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Electrical Engineering, Electronic Engineering, Information Engineering


  • subscriber loops, discrete multitone (DMT), radio frequency interference (RFI), very high bit rate digital subscriber line (VDSL)
Original languageEnglish
Pages (from-to)2300-2312
JournalIEEE Transactions on Circuits and Systems Part 1: Fundamental Theory and Applications
Issue number11
Publication statusPublished - 2004
Publication categoryResearch