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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/15436

Title: A Conditional ℓ1 Regularized MMSE Channel Estimation Technique for IBI Channels
Authors: Takano, Yasuhiro
Su, Hsuan-Jung
Juntti, Markku
Matsumoto, Tad
Keywords: Inter-block-interference (IBI)
subspace-based channel estimation
ℓ1 norm regularization
compressive sensing
turbo equalization
Issue Date: 2018-08-13
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Magazine name: IEEE Transactions on Wireless Communications
Volume: 17
Number: 10
Start page: 6720
End page: 6734
DOI: 10.1109/TWC.2018.2863295
Abstract: Inter-block-interference (IBI) caused as a result of pursuing the spectral efficiency can deteriorate channel estimation performance. For this problem, previously-proposed chained turbo estimation (CHATES) performs IBI cancelation by using the soft replica of the transmitted signal. The IBI cancelation technique can, however, suffer from a mean squared error (MSE) floor problem, since the soft replica is unavailable at the first turbo iteration. The IBI problem can be avoided by using channel impulse response (CIR) length constraint. Nevertheless, as shown in this paper, the IBI avoidance approach is difficult to be performed independently since it requires unbiased second-order statistics. This paper proposes, therefore, a new conditional ℓ1 regularized minimum mean square error (MMSE) channel estimation algorithm by jointly utilizing the IBI avoidance/cancelation and subspace techniques. Simulation results verify that the proposed algorithm solves the MSE floor problem, and, hence, improves the bit error rate (BER) convergence performance in realistic IBI channels including the effect of pulse shaping filters.
Rights: This is the author's version of the work. Copyright (C) 2018 IEEE. IEEE Transactions on Wireless Communications, 17(10), 2018, 6720-6734. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
URI: http://hdl.handle.net/10119/15436
Material Type: author
Appears in Collections:b10-1. 雑誌掲載論文 (Journal Articles)

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