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Radio Techniques Incorporating Sparse Modeling
Toshihiko NISHIMURA Yasutaka OGAWA Takeo OHGANE Junichiro HAGIWARA
Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
No.3
pp.591603 Publication Date: 2021/03/01 Publicized: 2020/09/01 Online ISSN: 17451337
DOI: 10.1587/transfun.2020EAI0001 Type of Manuscript: INVITED SURVEY PAPER Category: Digital Signal Processing Keyword: sparse modeling, compressed sensing, sparse Bayesian learning, DOA estimation, channel estimation,
Full Text: FreePDF(1.9MB)
Summary:
Sparse modeling is one of the most active research areas in engineering and science. The technique provides solutions from far fewer samples exploiting sparsity, that is, the majority of the data are zero. This paper reviews sparse modeling in radio techniques. The first half of this paper introduces directionofarrival (DOA) estimation from signals received by multiple antennas. The estimation is carried out using compressed sensing, an effective tool for the sparse modeling, which produces solutions to an underdetermined linear system with a sparse regularization term. The DOA estimation performance is compared among three compressed sensing algorithms. The second half reviews channel state information (CSI) acquisitions in multipleinput multipleoutput (MIMO) systems. In timevarying environments, CSI estimated with pilot symbols may be outdated at the actual transmission time. We describe CSI prediction based on sparse DOA estimation, and show excellent precoding performance when using the CSI prediction. The other topic in the second half is sparse Bayesian learning (SBL)based channel estimation. A base station (BS) has many antennas in a massive MIMO system. A major obstacle for using the massive MIMO system in frequencydivision duplex mode is an overhead for downlink CSI acquisition because we need to send many pilot symbols from the BS and to get the feedback from user equipment. An SBLbased channel estimation method can mitigate this issue. In this paper, we describe the outline of the method, and show that the technique can reduce the downlink pilot symbols.


