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A rank-reduced LMMSE canceller for narrowband interference suppression in OFDM-based systems
Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.ORCID-id: 0000-0003-0413-4826
Luleå tekniska universitet.
Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.
2003 (engelsk)Inngår i: IEEE Transactions on Communications, ISSN 0090-6778, E-ISSN 1558-0857, Vol. 51, nr 12, s. 2126-2140Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

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.

sted, utgiver, år, opplag, sider
2003. Vol. 51, nr 12, s. 2126-2140
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Forskningsprogram
Signalbehandling
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URN: urn:nbn:se:ltu:diva-9466DOI: 10.1109/TCOMM.2003.820761ISI: 000188088100021Scopus ID: 2-s2.0-0742321723Lokal ID: 81ada8f0-a019-11db-8975-000ea68e967bOAI: oai:DiVA.org:ltu-9466DiVA, id: diva2:982404
Merknad

Validerad; 2003; 20070109 (ysko)

Tilgjengelig fra: 2016-09-29 Laget: 2016-09-29 Sist oppdatert: 2018-07-10bibliografisk kontrollert

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