Portal de Periódicos da CAPES

Digital RFI Suppression in DMT-Based VDSL Systems

2004; Institute of Electrical and Electronics Engineers; Volume: 51; Issue: 11 Linguagem: Inglês

10.1109/tcsi.2004.836865

1558-1268

Frank Sjöberg, Rickard Nilsson, Per Ola Börjesson, Per Ödling, B. Wiese, John A. C. Bingham,

Advanced Wireless Communication Techniques

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.