Millimeter wave channel estimation based on subspace fitting

Zhang, Didi, Wang, Yafeng, Su, Zhong, and Xiang, Wei (2018) Millimeter wave channel estimation based on subspace fitting. IEEE Access, 6. pp. 76126-76139.

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Abstract

We consider the channel estimation of millimeter wave (mmWave) multiple-input multiple-output systems, where both the transmitter and receiver adopt hybrid beamforming structure. Due to the spatial sparsity of the mmWave channel, it can be reconstructed by estimating the direction and gain of the paths. Leveraging this feature, we propose a channel estimation algorithm based on subspace fitting to estimate the path directions, and the path gains are obtained using the least squares method. However, similar to the most existing mmWave channel estimation schemes, the proposed algorithm requires a two-dimensional search in candidate angle space, which is very complicated. In order to reduce the computational complexity, we develop a low-complexity channel estimation algorithm using the orthogonal matching pursuit (OMP) method, which significantly reduces the computational complexity. However, when the paths are strongly correlated, the channel estimation accuracy will decrease. To overcome this defect, we further develop a low-complexity method based on subspace fitting. This algorithm makes a trade-off between the computational complexity and channel estimation accuracy. Furthermore, the pilot beam pattern for different hybrid beamforming structure is designed using infinitely and quantized phase shifters to improve the signal-to-noise ratio of the pilot signals. In addition, the proposed channel estimation methods can also be used in the multi-user scenario. Simulation results demonstrate that the proposed subspace fitting method outperforms the existing methods when the angular resolution is the same. Meanwhile, the low-complexity OMP and subspace fitting methods have a good performance in single path scenario when compared to subspace fitting method, even if the computation complexity is lower. Moreover, the performance of the low-complexity subspace fitting method is close to the subspace fitting method.

Item ID: 56880
Item Type: Article (Research - C1)
ISSN: 2169-3536
Keywords: millimeter wave communications, channel estimation, subspace fitting, orthogonal matching pursuit, hybrid beamforming
Copyright Information: © 2018 IEEE. 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.
Funders: Ministry of Education, China, China Mobile Joint Scientific Research Fund (CMJSRF)
Projects and Grants: CMJSRF grant MCM20160105
Date Deposited: 16 Jan 2019 07:39
FoR Codes: 10 TECHNOLOGY > 1005 Communications Technologies > 100510 Wireless Communications @ 100%
SEO Codes: 89 INFORMATION AND COMMUNICATION SERVICES > 8901 Communication Networks and Services > 890103 Mobile Data Networks and Services @ 100%
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