Title :
Digital RFI suppression in DMT-based VDSL systems
Author :
Sjöberg, Frank ; Nilsson, Rickard ; Börjesson, Per Ola ; Ödling, Per ; Wiese, Brian ; Bingham, John A C
Author_Institution :
Div. of Signal Process., Lulea Univ. of Technol., Sweden
Abstract :
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.
Keywords :
digital subscriber lines; interference suppression; radiofrequency interference; signal processing; DMT carriers; DMT-based VDSL systems; VDSL systems; digital RFI suppression; discrete multitone; frequency domain; narrow-band RF signal; radio frequency interference; subscriber loops; very high bit rate digital subscriber line; Bit rate; DSL; Discrete Fourier transforms; Filter bank; Frequency; Narrowband; OFDM modulation; Radiofrequency interference; Telecommunication standards; Wire; 65; DMT; Discrete multitone; RFI; VDSL; radio frequency interference; subscriber loops; very high bit rate digital subscriber line;
Journal_Title :
Circuits and Systems I: Regular Papers, IEEE Transactions on
DOI :
10.1109/TCSI.2004.836865
