Digital RFI suppression in DMT-based VDSL systems

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...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. 1, Fundamental theory and applications Fundamental theory and applications, 2004-11, Vol.51 (11), p.2300-2312
Main Authors: Sjoberg, F., Nilsson, R., Borjesson, P.O., Odling, P., Wiese, B., Bingham, J.A.C.
Format: Article
Language:English
Subjects:
Bit rate
Carriers
Circuits
Computer simulation
Digital
Discrete Fourier transforms
Discrete multitone (DMT)
DSL
Electrical Engineering, Electronic Engineering, Information Engineering
Elektroteknik och elektronik
Engineering and Technology
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
Teknik
Telecommunication standards
very high bit rate digital subscriber line (VDSL)
Wire
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Summary: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.
ISSN:1549-8328
1057-7122
1558-0806
1558-0806
DOI:10.1109/TCSI.2004.836865