Digital RFI suppression in DMT-based VDSL systems

• Published in: IEEE transactions on circuits and systems. I, Regular papers Vol. 51; no. 11; pp. 2300 - 2312
• Main Authors: Sjoberg, F., Nilsson, R., Borjesson, P.O., Odling, P., Wiese, B., Bingham, J.A.C.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.11.2004; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Bit rate; Carriers; Circuits; Computer simulation; Digital; Discrete Fourier transforms; Discrete multitone (DMT); DSL; Filter bank; Frequency; Mathematical models; Narrowband; Noise levels; OFDM modulation; Radio frequency interference; radio frequency interference (RFI); Radiofrequency interference; Retarding; Signal Processing; Signalbehandling; subscriber loops; Telecommunication standards; very high bit rate digital subscriber line (VDSL); Wire
• ISSN: 1549-8328; 1558-0806; 1558-0806
• DOI: 10.1109/TCSI.2004.836865

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.