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Sub-carrier SNR Estimation at the Transmitter for Reduced Feedback OFDMA
KTH, School of Electrical Engineering (EES), Signal Processing.
KTH, School of Electrical Engineering (EES), Signal Processing.
KTH, School of Electrical Engineering (EES), Signal Processing.ORCID iD: 0000-0003-2298-6774
2006 (English)In: Proceedings European Signal Processing Conference, 2006Conference paper (Refereed)
Abstract [en]

In multiuser OFDMA FDD systems with resource allocation based on the instantaneous channel quality of the users, the feedback overhead can be very large. In this paper, a method to significantly reduce this feedback is proposed. The idea is to let the users feed back the channel quality (the SNR in this paper) of only a sub-set of their strongest sub-carriers. The SNRs on the other sub-carriers are instead estimated from the fed back values. We derive the MMSE estimator of the SNR of a sub-carrier, which uses two fed back SNRs as input. As a comparison, we also study the performance of the LMMSE estimator as well as spline interpolation. Numerical results show that the LMMSE estimator tends to underestimate the SNR compared to the other two estimators, whereas the interpolation tends to overestimate the SNR. System simulations including adaptive modulation and packet losses indicate that the MMSE estimator is the best choice in practice.

Place, publisher, year, edition, pages
, European Signal Processing Conference, ISSN 22195491
Keyword [en]
OFDMA, FDD, resource allocation, feedback overhead, channel quality, sub-carrier, LMMSE estimator
National Category
URN: urn:nbn:se:kth:diva-73194ScopusID: 2-s2.0-84862607441OAI: diva2:488626
14th European Signal Processing Conference, EUSIPCO 2006; Florence; Italy; 4-8 September 2006

QC 20141105

Available from: 2012-02-01 Created: 2012-02-01 Last updated: 2014-11-05Bibliographically approved

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