A rank-reduced LMMSE canceller for narrowband interference suppression in OFDM-based systems

We present a narrowband interference (NBI) canceller that suppresses spectral leakage in an orthogonal frequency-division multiplexing (OFDM)-based system caused by a narrowband (NB) signal. We assume that the spectrum of the NB signal is within the spectrum of the OFDM signal. This can be the case,...

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Bibliographic Details
Published in:IEEE transactions on communications 2003-12, Vol.51 (12), p.2126-2140
Main Authors: Nilsson, R., Sjoberg, F., LeBlanc, J.P.
Format: Article
Language:English
Subjects:
Cancellers
Computer simulation
DSL
Error analysis
Frequency division multiplexing
Information analysis
Interference cancellation
Interference suppression
Leakage
Monte Carlo methods
Narrowband
Niobium
OFDM modulation
Orthogonal Frequency Division Multiplexing
Signal analysis
Signal design
Signal Processing
Signalbehandling
Spectra
Studies
Subscriber line
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Summary:We present a narrowband interference (NBI) canceller that suppresses spectral leakage in an orthogonal frequency-division multiplexing (OFDM)-based system caused by a narrowband (NB) signal. We assume that the spectrum of the NB signal is within the spectrum of the OFDM signal. This can be the case, e.g., on digital subscriber lines (DSL) and in new unlicensed frequency bands for radio transmission. The canceller makes linear minimum mean-square error estimates of the spectral leakage by measuring the NBI on a few modulated or unmodulated OFDM subcarriers. It uses a model of the NB signal's power spectral density as a priori information. Using a frequency invariant design, it is possible to cancel NBI from signals that are changing their frequency location with significantly reduced complexity overhead. The operational complexity of the canceller can be lowered by using the theory of optimal rank reduction and using the time-bandwidth product of the NB signal. Analytical performance evaluations, as well as Monte Carlo simulations, show that, without perfect a priori information, this canceller can suppress the spectral leakage from a strong NB signal (e.g., with equal power as the OFDM signal) to well below the background noise floor for typical applications where it causes negligible signal-to-noise ratio and symbol error rate degradation.
ISSN:0090-6778
1558-0857
1558-0857
DOI:10.1109/TCOMM.2003.820761