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Frequency smoothing gains in preamble-based channel estimation for multicarrier systems
KTH, School of Electrical Engineering (EES), Signal Processing.
KTH, School of Electrical Engineering (EES), Automatic Control.ORCID iD: 0000-0003-0355-2663
KTH, School of Electrical Engineering (EES), Signal Processing.ORCID iD: 0000-0002-3599-5584
KTH, School of Electrical Engineering (EES), Automatic Control.ORCID iD: 0000-0002-9368-3079
2013 (English)In: Signal Processing, ISSN 0165-1684, E-ISSN 1872-7557, Vol. 93, no 9, 2777-2782 p.Article in journal (Refereed) Published
Abstract [en]

In this paper, the problem of least-squares (LS) preamble-based channel estimation in multicarrier systems under a deterministic channel assumption is revisited. The analysis is presented for the filterbank multicarrier offset quadrature amplitude modulation (FBMC/OQAM) system, although the derived results hold unchanged for the cyclic prefixed orthogonal frequency division multiplexing (CP-OFDM) system, as well. Assuming independent noise disturbances per subcarrier, we show that frequency-domain smoothing techniques can be used to improve the mean square error (MSE) performance. Depending on the number of subcarriers, the choice of smoothing may be different. We also present the time-domain formulation of the frequency-domain smoothing. Based on this formulation, we show that frequency-domain smoothing techniques can minimize the variance of the LS channel estimator, while they can further reduce its MSE by trading bias for variance. Simulations are given to support the derived results.

Place, publisher, year, edition, pages
Elsevier, 2013. Vol. 93, no 9, 2777-2782 p.
Keyword [en]
Least squares (LS), Filterbank multicarrier (FBMC), Offset quadrature amplitude modulation (OQAM), Preamble, Smoothing
National Category
Signal Processing
Identifiers
URN: urn:nbn:se:kth:diva-124952DOI: 10.1016/j.sigpro.2013.01.010ISI: 000320347600040Scopus ID: 2-s2.0-84878019308OAI: oai:DiVA.org:kth-124952DiVA: diva2:638765
Note

QC 20130802

Available from: 2013-08-02 Created: 2013-08-02 Last updated: 2017-12-06Bibliographically approved

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Rojas, Cristian R.Bengtsson, MatsHjalmarsson, Håkan

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