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Applications-oriented least squares experiment design in multicarrier communication systems
KTH, School of Electrical Engineering (EES), Automatic Control. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre. (System Identification Group)
KTH, School of Electrical Engineering (EES), Automatic Control. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre. (System Identification Group)ORCID iD: 0000-0003-0355-2663
KTH, School of Electrical Engineering (EES), Automatic Control. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre. (System Identification Group)ORCID iD: 0000-0002-9368-3079
2013 (English)In: Proceedings of the 11th IFAC International Workshop on Adaptation and Learning in Control and Signal Processing (ALCOSP 2013), 2013, 74-79 p.Conference paper, Published paper (Refereed)
Abstract [en]

Recently, the application-oriented framework for pilot design in communication systems has been introduced. This framework is mostly appropriate for such a design since the training sequences are selected to optimize a final performance metric of interest and not some of the classical metrics quantifying the distance between the estimated model and the true one, e.g., the mean square error (MSE). In this perspective, the known pilot sequences that are optimal for any communication system and for any estimation task have to be reexamined. In this paper, the problem of training pilot design for the task of channel estimation in cyclic prefixed orthogonal frequency division multiplexing (CP-OFDM) systems is revisited. So far, the optimal training sequences for least squares (LS) channel estimation with respect to minimizing the channel MSE under a training energy constraint have been derived. Here, we investigate the same problem for the LS channel estimator, but when the design takes into account an end performance metric of interest, namely, the symbol estimate MSE due to the use of per subcarrier zero forcing (ZF) symbol estimators/equalizers at the receiver side. Based on some convex approximations, we verify that the optimal full preamble, i.e, the preamble employing pilots on all subcarriers, for LS channel estimation in its classical context are near optimal in the aforementioned application-oriented context for the ZF symbol estimate MSE in certain target signal-to-noise ratio (SNR) operating intervals.

Place, publisher, year, edition, pages
2013. 74-79 p.
Keyword [en]
Application-oriented, Convex approximation, Least squares channel estimation, LS channel estimation, Multicarrier communication systems, Optimal training sequences, Performance metrices, Signaltonoise ratio (SNR)
National Category
Communication Systems
Identifiers
URN: urn:nbn:se:kth:diva-137314DOI: 10.3182/20130703-3-FR-4038.00076Scopus ID: 2-s2.0-84885821099ISBN: 9783902823373 (print)OAI: oai:DiVA.org:kth-137314DiVA: diva2:678707
Conference
11th IFAC International Workshop on Adaptation and Learning in Control and Signal Processing (ALCOSP 2013)
Note

QC 20140121

Available from: 2013-12-12 Created: 2013-12-12 Last updated: 2014-01-21Bibliographically approved

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Rojas, Cristian R.Hjalmarsson, Håkan

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