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A full journal paper authored by Mr.Tanaka of a School of Information Science has been published in IEEE TWC

A full journal paper authored by Mr.Yasuhiro Takano, a 3rd year doctral student of Information Theory and Signal Processing Laboratory, School of Information Science,has been published in IEEE Transactions on Wireless Communications.


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■ Date of Publication

August 18, 2015

■ Title of Paper

ℓ1 LS and ℓ2 MMSE-based hybrid channel estimation for intermittent wireless connections

■ Author

Yasuhiro Takano

■ Co-authors

Prof. Markku Juntti and Prof. Tad Matsumoto

■ Abstract

Wireless communications, such as Web-browsing with smart phones, can be intermittent. It is well-known that subspace-based ℓ2 minimum mean square error (MMSE) channel estimation techniques can achieve the performance bound— Cramér-Rao bound (CRB) — under an assumption that channel models change slowly compared to transmission durations. The assumption is not always correct in intermittent transmission scenarios. The conventional ℓ2 MMSE can, therefore, suffer from the tracking error problem since it cannot chase abrupt channel changes. On the other hand, ℓ1 regularized least squares (LS) channel estimation does not suffer from the tracking error, even though it does not achieve the CRB in general.
This paper proposes a new ℓ1 LS and ℓ2 MMSE based-hybrid channel estimation algorithm reduced from a frim mathematical discussion. The proposed algorithm solves the tracking error problem completely while achieving the CRB, although it requires the same complexity order as that of the conventional ℓ2 MMSE technique. Robustness of the proposed method allows broadband wireless communication services to significantly improve the throughput performance.

■ Comment

It should be noted here that this research has been conducted under the financial support of JAIST—University of Oulu Dual Degree Program. We, the author and the co-authors, would like to thank the financial support provided by the universities.

■ References

The author’s version of the paper is available here.


October 9, 2015