Abstract
In massive multiple-input multiple-output systems, due to high cost and power consumption, unconstrained fully digital precoding is excluded for its requirement of dedicated radio-frequency (RF) chains per antenna element. Therefore, hybrid digital/analog precoding solution is deemed as the most potential candidate. In this paper, based on the singular value decomposition (SVD) technique, a low-complexity yet high performance precoding strategy is proposed. Specifically, through the operation of the SVD technique on the fully digital precoding matrix, the eigenvectors with the same number of the data streams are selected out to capture the angle information of the analog phase shifters. To obtain the remaining required eigenvectors, the relativity information between the left decomposed matrix and the optimal fully digital precoding matrix is exploited. In this way, the resultant hybrid analog/digital precoding is realized in a low complexity manner. Simulation results show that the spectral efficiency achieved by our proposed scheme is better compared to that with the orthogonal-matching-pursuit (OMP) scheme in most of the practical scenarios when the number of data streams is equal to that of RF chains, and is very close to that by the OMP scheme when the number of data stream is less than that of RF chains.
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Notes
When the number of RF chains is equal to that of the antennas, the system spectral efficiency achieved by the hybrid precoding scheme is as same as that of the fully digital precoding mode.
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Acknowledgements
This work was supported by the Open Project Program of the Key Laboratory of Universal Wireless Communications (2016-KFKT-2016104), Ministry of Education, the Beijing University of Posts and Telecommunications, in part by the Natural Science Foundation of Hunan Province of China (2017JJ2249), the National Natural Science Foundation of China (61771414), Key point research and invention program in Hunan Province of China (2018GK2014), Research subproject of key R&D plan in Hunan Province (2016JC2021) and Science and Technology on Communication Information Security Control Laboratory.
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Wang, S., Li, L., Ruby, R. et al. A general hybrid precoding scheme for millimeter wave massive MIMO systems. Wireless Netw 26, 1331–1345 (2020). https://doi.org/10.1007/s11276-019-02190-5
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DOI: https://doi.org/10.1007/s11276-019-02190-5